Plant extract manufacturing method

Abstract

A plant extract production method comprising: an extraction step for obtaining an extract by extraction from a plant dispersion containing a plant; a filtration step for obtaining a filtrate by filtering the extract by means of cross-flow filtration; and a dialysis step for dialyzing the filtrate by means of electrodyalysis.

Description

[Technical Field]

[0001] The present invention relates to a method for producing a plant extract. [Background technology]

[0002] Various components contained in the leaves, stems, roots, etc. of plants each have their own unique properties and are used for various purposes. Extraction is one of the techniques for separating specific components from plants containing multiple components, and this technique is used in a wide range of fields. However, plant extracts obtained by plant extraction may contain not only the target components but also undesirable components, and it is important to separate and remove such undesirable specific components. For example, plant extracts obtained by extracting tobacco plants contain important components for luxury goods, such as aroma compounds that have a positive effect on aroma.However, they also contain unwanted components, such as nitrate proteins, which are precursors of tobacco-specific nitrosamines (TSNAs), and proteins found in many plants, such as Rubisco, that do not directly affect aroma. Methods for separating and removing specific components from tobacco plant extracts include, for example, precipitation membrane separation using pH adjustment (Patent Documents 1 and 2), filtration using activated carbon (Patent Document 3), and distillation (Patent Document 4). Methods for removing unnecessary components such as proteins include, for example, a method using oxygen decomposition (Patent Document 5), and so-called ultrafiltration and microfiltration methods that can filter by molecular weight (Patent Documents 6 to 8). In particular, methods for separating nitrate nitrogen include ultrafiltration or reverse osmosis membrane separation (Patent Document 9), or electrodialysis (Patent Document 10). Among these, electrodialysis is a useful technique because it can also be used to remove TSNAs from tobacco plants (Patent Documents 11 and 12). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] US Patent Application Publication No. 3,959,246 [Patent Document 2] Special Publication No. 2016-511004 [Patent Document 3] US Patent Application Publication No. 3,424,171 [Patent Document 4] US Patent Application Publication No. 4,150,677 [Patent Document 5] US Patent Application Publication No. 4,727,889 [Patent Document 6] US Patent Application Publication No. 5,235,992 [Patent Document 7] US Patent Application Publication No. 5,301,694 [Patent Document 8] Japanese Patent Application Publication No. 3-010667 [Patent Document 9] International Publication No. 2004 / 098323 [Patent Document 10] US Patent Application Publication No. 4,302,308 [Patent Document 11] Chinese Patent Application Publication No. 104351943 [Patent Document 12] Special Publication No. 2019-518442 Summary of the Invention [Problem to be solved by the invention]

[0004] As mentioned above, there are several methods for separating and removing impurities such as proteins from plant extracts, but they also have their own problems. For example, the precipitation membrane separation method using pH adjustment requires the use of alkali, which requires the laborious process of returning the pH to an acidic state. Furthermore, distillation methods may decompose desirable components, and filtration requires the laborious regeneration and maintenance of membranes. Furthermore, there is a concern that electrodialysis may reduce its separation ability if impurities are present in the extract. Therefore, an object of the present invention is to provide a method for producing a plant extract by efficiently separating and removing impurities such as proteins from a plant extract to obtain a plant extract. [Means for solving the problem]

[0005] As a result of extensive research, the present inventors have discovered that the above-mentioned problems can be solved by filtering a plant extract using a specific method and then subjecting it to electrodialysis, thereby arriving at the present invention.

[0006] [1] An extraction step of extracting a plant dispersion containing a plant to obtain an extract; a filtration step of filtering the extract by cross-flow filtration to obtain a filtrate; A dialysis step of dialyzing the filtrate by electrodialysis. [2] The method for producing a plant extract according to [1], wherein the cross-flow filtration is carried out by passing the extract through a filter having an average pore size of 0.2 μm or less. [3] The method for producing a plant extract according to [2], wherein the average pore size of the filtration membrane is 2,000 Da or more and 100,000 Da or less. [4] In the cross-flow filtration, the membrane surface flow rate for the average pore size of the filtration membrane is 0.1 mL / min cm 2 More than 10mL / min cm 2 The method for producing a plant extract according to any one of [1] to [3] below. [5] The method for producing a plant extract according to any one of [1] to [4], wherein the voltage applied in the electrodialysis is 30 V or less. [6] The method for producing a plant extract according to any one of [1] to [5], wherein the plant dispersion liquid further contains water. [7] The method for producing a plant extract according to any one of [1] to [6], wherein the plant is a tobacco plant. [8] A method for manufacturing a tobacco product having a tobacco rod wrapped in cigarette paper that wraps a tobacco filler, and a mouthpiece portion, A method for producing a tobacco product, comprising the step of adding a plant extract produced by the plant extract production method described in any one of [1] to [7] to at least one selected from the group consisting of the tobacco filler and the cigarette paper. [9] A method for producing an oral pouch product having an oral composition and a pouch for packaging the oral composition, comprising: A method for producing an oral pouch product, comprising the step of adding a plant extract produced by the method for producing a plant extract according to any one of [1] to [7] to the oral composition. [Effects of the Invention]

[0007] The present invention provides a method for producing a plant extract, which allows for the efficient separation and removal of impurities such as proteins from a plant extract to obtain a plant extract, and further provides a method for producing a tobacco product or an oral pouch product using this plant extract. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a schematic diagram of a tobacco product according to an embodiment of the present invention. [Figure 2] 1 is a schematic diagram of an electrically heated tobacco product according to an embodiment of the present invention; [Figure 3] 1 is a schematic diagram of an electrically heated tobacco product according to an embodiment of the present invention; [Figure 4] 1 is a graph showing the measurement results of the residual protein level in an example. [Figure 5] 1 is a graph showing the results of nicotine analysis after electrodialysis in an example. [Figure 6] 1 is a graph showing the results of nicotine analysis after electrodialysis in an example. DETAILED DESCRIPTION OF THE INVENTION

[0009] The following describes in detail the embodiments of the present invention, but these descriptions are examples (typical examples) of the embodiments of the present invention, and the present invention is not limited to these contents as long as it does not deviate from the gist of the invention. In this specification, a numerical range expressed using "to" means a range that includes the numerical values ​​written before and after "to" as the lower and upper limits, and "A to B" means A or more and B or less.

[0010] <Production method of plant extracts> The method for producing a plant extract according to an embodiment of the present invention (hereinafter also simply referred to as "the method for producing a plant extract") is a method for producing a plant extract, comprising: an extraction step of extracting a plant dispersion (plant component dispersion) containing a plant to obtain an extract; a filtration step of filtering the extract by cross-flow filtration to obtain a filtrate; and a dialysis step of dialyzing the filtrate by electrodialysis. The method for producing a plant extract according to this embodiment may include steps other than the above-mentioned extraction step, filtration step, and dialysis step.

[0011] [Extraction process] The method for producing a plant extract according to this embodiment includes an extraction step of extracting a plant dispersion containing a plant to obtain an extract. The method for producing a plant extract according to this embodiment involves separating and removing impurities larger than a specific size from the extract obtained in the extraction step by cross-flow filtration, and then separating specific substances by electrodialysis to obtain a plant extract from which specific impurities have been removed. Since impurities larger than the specific size include proteins typically found in plants, the raw material used in the extraction step is not particularly limited as long as it is made from a plant.

[0012] (plant) The type of plant used in the extraction step is not particularly limited, and may be a seed plant or a non-seed plant. Seed plants may be gymnosperms or angiosperms, and examples of gymnosperms include cycads such as cycads, ginkgos such as ginkgo, pines such as Japanese red pine or Japanese black pine, and gnetum such as gnemon. Examples of angiosperms include Solanaceae such as tobacco or eggplant, Asteraceae such as chrysanthemum, Orchidaceae such as orchid, Fabaceae such as pea, Poaceae such as rice, Rubiaceae such as coffee, Lamiaceae such as mint, Euphorbiaceae such as spurge, and Cyperaceae such as sedge. Examples of non-seed plants include ferns such as bracken and Osmund, bryophytes such as liverwort and hornwort, and algae such as kelp and wakame. The method for producing a plant extract according to this embodiment makes it easy to separate and remove unwanted components, such as components that are the source of components of concern, such as nitrate-nitrogen proteins, which are precursors of tobacco-specific nitrosamines (TSNAs), and components that do not directly affect aroma, such as proteins contained in many plants, such as Rubisco. From this perspective, the plant used in this embodiment is preferably a nicotine-containing plant, particularly tobacco (hereinafter also referred to as "tobacco plant"), among the above-mentioned plants. The part of the plant used is not particularly limited, and for example, in the case of a seed plant, any of the leaves, stems, or roots may be used, but leaves are preferred from the viewpoint of ease of extraction and availability. In view of the above-mentioned preferable conditions, in the production method according to this embodiment, it is preferable to use tobacco leaves (hereinafter also referred to as "tobacco leaves") as the plant. The type of tobacco leaf is not particularly limited, and examples thereof include flue-cured, burley, oriental, native, other Nicotiana tabacum varieties, Nicotiana rustica varieties, etc. These varieties can be used alone, or can be blended during the process of converting tobacco leaves into processed tobacco leaves to obtain the desired flavor.

[0013] (Plant dispersion) The plant dispersion liquid is not particularly limited as long as it is a liquid containing a plant, and the solvent may be any solvent capable of dissolving the substance to be extracted, and may be an organic solvent or an inorganic solvent. For example, when a tobacco plant is used as the plant, the solvent is preferably one capable of dissolving nicotine, and examples thereof include water, ethylene glycol, propylene glycol, and ethanol, but water is preferred from the viewpoints of safety, cost, and availability. The plant content in the plant dispersion is not particularly limited, and is usually 5% by weight or more, preferably 10% by weight or more, and more preferably 15% by weight or more, and is usually 50% by weight or less, preferably 45% by weight or less, more preferably 40% by weight or less, even more preferably 35% by weight or less, particularly preferably 30% by weight or less, and even more particularly preferably 20% by weight or less. The solvent content in the plant dispersion is not particularly limited, but is usually 50% by weight or more, preferably 55% by weight or more, more preferably 60% by weight or more, even more preferably 65% ​​by weight or more, and particularly preferably 70% by weight or more, and is usually 95% by weight or less, preferably 90% by weight or less, and more preferably 85% by weight or less.

[0014] The plant dispersion may contain components other than the plant and the solvent (other components), and examples of the other components include reducing sugars, natural sweeteners, artificial sweeteners, pH adjusters, buffers, preservatives, or flavorings.

[0015] (extraction) The extraction method is not particularly limited, and any known method can be used, including a process of heating the above-mentioned plant dispersion to obtain an extract. The heating temperature is not particularly limited as long as it is a temperature at which the plant dispersion liquid can be evaporated, and may be, for example, 1° C. or higher, preferably 5° C. or higher, more preferably 20° C. or higher, even more preferably 40° C. or higher, particularly preferably 45° C. or higher, and most particularly preferably 80° C. or higher, and may be 95° C. or lower, preferably 90° C. or lower. This heating temperature is particularly advantageous when using tobacco plants, i.e., when extracting nicotine. The heating time is not particularly limited, and may be, for example, 20 minutes or more, preferably 30 minutes or more, more preferably 1 hour or more, and may be 3 hours or less, more preferably 2 hours or less. time is particularly advantageous when tobacco plants are used, i.e., when nicotine is extracted.

[0016] The viscosity at 25°C of the extract obtained in the extraction step is not particularly limited, but is usually 0.7 mPa·s or more, preferably 0.8 mPa·s or more, more preferably 1.0 mPa·s or more, and even more preferably 1.5 mPa·s or more, and is usually 8 mPa·s or less, preferably 6.0 mPa·s or less, more preferably 4.0 mPa·s or less, and even more preferably 2.0 mPa·s or less. The viscosity can be measured, for example, with a tuning-fork vibration viscometer (for example, a viscometer manufactured by A&D).

[0017] [Filtration process] The method for producing a plant extract according to this embodiment includes a filtration step of filtering the extract obtained in the above extraction step by cross-flow filtration to obtain a filtrate. Cross-flow filtration is a filtration method in which the flow direction of the feed liquid and the filtration direction are different, for example, they are perpendicular (in this specification, "perpendicular" includes approximately perpendicular). Filtration by this method is a large-volume filtration. liquidThis method is suitable for concentrating the above-mentioned substances, and has the advantage that it is easy to prevent particle deposition and clogging on the surface of the filtration membrane because the flow direction of the feed liquid and the filtration direction are different, and it also has the effect of shortening the processing time.

[0018] The method of cross-flow filtration is not particularly limited, and known methods can be used, and the filtration can be carried out using a cross-flow filter (for example, LabUnit M10 manufactured by Alfa Laval). The form of the filtration membrane in cross-flow filtration is not particularly limited, and may be planar or cylindrical, although a cylindrical form is preferred from the viewpoint of reducing the size of the filter and improving filtration efficiency. In the case of a cylindrical form, for example, the diameter may be 5 cm or more and 100 cm or less, and the axial length may be 2 cm or more and 2000 cm or less. Furthermore, the form in which the feed liquid (extract liquid) flows is not particularly limited, and may or may not be a circulating type, although a circulating type is preferred from the viewpoint of reducing the size of the filter and improving filtration efficiency.

[0019] The material of the filtration membrane is not particularly limited, but typically includes polyester, polypropylene, polysulfone, hydrophilic polysulfone, polyethersulfone, fluororesin, and the like. The thickness of the filtration membrane is not particularly limited, but from the viewpoint of preventing clogging and improving filtration efficiency, it is usually 0.1 μm or more, preferably 0.5 μm or more, more preferably 1.0 μm or more, even more preferably 1.5 μm or more, particularly preferably 2.0 μm or more, and particularly preferably 2.5 μm or more, and the upper limit may be, for example, 1 mm or less. The area of ​​the filtration membrane can be appropriately set depending on the application.

[0020] The average pore size of the filtration membrane is not particularly limited, but from the viewpoint of preventing clogging and improving filtration efficiency, when a microfiltration membrane is used, it is usually 0.1 μm or more, preferably 0.15 μm or more, and usually 0.5 μm or less, preferably 0.25 μm or less, and more preferably 0.2 μm or less. Also, from the same viewpoint, when an ultrafiltration membrane is used, the pore size of the filtration membrane is usually 1,000 Da or more, preferably 2,000 Da or more, more preferably 10,000 Da or more, and even more preferably 20,000 Da or more, and usually 200,000 Da or less, preferably 100,000 Da or less, more preferably 50,000 Da or less, and even more preferably 25,000 Da or less. Typically, the average particle size of unwanted components, such as components that are the source of worrying substances such as nitrate nitrogen proteins, which are precursors of tobacco-specific nitrosamines (TSNAs), and components that do not directly affect aroma, such as proteins contained in many plants such as Rubisco, is 50,000 Da (g / mol) or more and 80,000 Da or less, and the average particle size of nicotine is 744.4 Da. This range is particularly advantageous when using tobacco plants, as it allows for efficient separation of components such as proteins from nicotine. From the viewpoint of filtration efficiency, a multi-stage system using a plurality of membranes is also included. The porosity of the membrane surface of the filtration membrane is not particularly limited.

[0021] There are no particular restrictions on the membrane surface flow rate relative to the average pore size of the filtration membrane, but from the perspective of preventing clogging and improving filtration efficiency, it is usually set to 0.1 mL / min cm 2 is greater than or equal to 0.2 mL / min cm 2 Preferably, the flow rate is 0.5 mL / min cm or more. 2 More preferably, it is 0.7 mL / min cm or more. 2 More particularly, it is preferable that the flow rate is equal to or greater than 20 mL / min cm. 2 is less than or equal to 10 mL / min cm 2 Preferably, it is 7 mL / min cm or less. 2Preferably, it is 5 mL / min cm or less. 2 More preferably, it is 2.5 mL / min cm or less. 2 It is particularly preferable that the above range is less than or equal to: The above range is advantageous particularly when tobacco plants are used, from the viewpoint of the average particle size of the above-mentioned unnecessary components contained in tobacco plants.

[0022] The temperature of the extract during cross-flow filtration is not particularly limited, but from the viewpoint of preventing clogging and improving filtration efficiency, it is usually 15° C. or higher, preferably 20° C. or higher, more preferably 30° C. or higher, and particularly preferably 45° C. or higher, and is usually 95° C. or lower, preferably 90° C. or lower, more preferably 80° C. or lower, and particularly preferably 70° C. or lower. The above ranges are advantageous, particularly when tobacco plants are used, from the viewpoint of the viscosity of the tobacco plants.

[0023] [Dialysis process] The method for producing a plant extract according to this embodiment includes a dialysis step in which the filtrate obtained in the filtration step is dialyzed by electrodialysis. Electrodialysis uses a device equipped with an ion exchange membrane and electrodes that allow only ions to pass through. By applying a voltage between the electrodes, ions in a solution can be forced to pass through the ion exchange membrane, thereby removing specific substances.

[0024] The electrodialysis method is not particularly limited, and known methods can be used, and the electrodialysis can be carried out using an electrodialysis device (for example, MICRO ACILYZER S3 or ACILYZER EX3B manufactured by Astom Corporation). The form of the filtration membrane in electrodialysis is not particularly limited, but is usually planar, and for example, multiple layers of filtration membranes measuring 10 to 300 cm x 5 to 100 cm can be arranged and used. The form in which multiple filtration membranes are arranged is not particularly limited, and gaps may or may not be provided, although gaps are preferably provided. Furthermore, the form in which the feed liquid (extract liquid) flows is not particularly limited, and may or may not be a circulating system, but a circulating system is preferred from the viewpoint of reducing the size of the filter and improving filtration efficiency. The type and size of the electrodes used in the electrodialysis can be appropriately determined depending on the filtrate used and the apparatus used for the electrodialysis. The voltage applied between the electrodes is not particularly limited, but from the viewpoint of efficient electrodialysis, it is usually 1.00 V or more, preferably 1.50 V or more, more preferably 2.00 V or more, even more preferably 1.8 V or more, particularly preferably 1.85 V or more, may be 5 V or more, or may be 10 V or more, and is usually 50 V or less, preferably 40 V or less, more preferably 35 V or less, even more preferably 30 V or less, particularly preferably 20 V or less. In particular, if the voltage is too high, separation and decomposition of water (H + and OH - ), and there is a concern that separation or decomposition of other components may occur, so a voltage of 30 V or less is preferable. Furthermore, the concentration of each component contained in the plant extract can be controlled by controlling the voltage. For example, when a tobacco plant is used as the plant, the nicotine content in the plant extract can be changed by controlling the voltage. As will be seen from the examples described below, at 30 V the amount of nicotine can be efficiently reduced, and at 10 V the amount of nicotine can be efficiently maintained.

[0025] The material of the filtration membrane is not particularly limited, but typically includes regenerated cellulose, cellulose ester, polyacrylonitrile, polysulfone, polymethyl methacrylate, ethylene vinyl alcohol copolymer, and the like. The thickness of the filtration membrane is not particularly limited, but from the viewpoint of preventing clogging and improving filtration efficiency, it is usually 0.5 μm or more, preferably 0.10 μm or more, more preferably 0.15 μm or more, even more preferably 0.20 μm or more, and particularly preferably 0.25 μm or more, and is usually 0.50 μm or less, preferably 0.45 μm or less, more preferably 0.40 μm or less, even more preferably 0.35 μm or less, and particularly preferably 0.30 μm or less. The area of ​​the filtration membrane can be appropriately set depending on the application.

[0026] The average pore size of the filtration membrane is not particularly limited, but from the viewpoint of preventing clogging and improving filtration efficiency, when an ultrafiltration membrane is used, it is usually 100 Da or more, preferably 500 Da or more, more preferably 1,000 Da or more, and even more preferably 2,000 Da or more, and is usually 100,000 Da or less, and even more preferably 10,000 Da or less. Usually, the average particle size of unwanted components, such as proteins of nitrate nitrogen, which are precursors of tobacco-specific nitrosamines (TSNAs), and components that do not directly affect aroma, such as proteins contained in many plants, is 50,000 g / mol (Da) or more and 80,000 g / mol (Da), and the average particle size of nicotine is 744.4 g / mol (Da). Because this range allows for efficient separation of components such as proteins from nicotine, the above range is particularly advantageous when using tobacco plants. The porosity of the membrane surface of the filtration membrane is not particularly limited.

[0027] There are no particular restrictions on the membrane surface flow rate relative to the average pore size of the filtration membrane, but from the perspective of preventing clogging and improving filtration efficiency, it is usually set to 0.0001 mL / min cm 2 is greater than or equal to 0.0005 mL / min cm 2 Preferably, it is 0.001 mL / min cm or more. 2 More preferably, it is 0.002 mL / min cm or more. 2 More preferably, it is 0.003000 mL / min cm or more. 2 It is particularly preferable that the flow rate is 4 mL / min cm or more, and typically 4 mL / min cm 2 is less than or equal to 0.4 mL / min cm 2 Preferably, it is 0.040 mL / min cm or less. 2 More preferably, it is 0.01 mL / min cm or less. 2 It is particularly preferable that the above range is less than or equal to: The above range is advantageous particularly when tobacco plants are used, from the viewpoint of the average particle size of the above-mentioned unnecessary components contained in tobacco plants. The temperature of the extract being supplied during electrodialysis is not particularly limited, and can be set to, for example, 10 to 40°C.

[0028] [Preparation process] The method for producing a plant extract according to this embodiment may include a preparatory step of preparing a plant dispersion liquid before the extraction step. The method for preparing the plant dispersion liquid is not particularly limited, and examples thereof include a method in which raw materials that can be contained in the plant dispersion liquid other than the solvent are added to the solvent, and the mixture is stirred to become uniform.

[0029] [Concentration process] The method for producing a plant extract according to this embodiment may include a concentration step of concentrating the plant extract obtained by the dialysis step. The concentration method is not particularly limited, and known methods can be applied, for example, it can be carried out using an apparatus such as an evaporator. Furthermore, from the viewpoint of shortening the concentration time and improving efficiency, it is preferable to carry out the concentration by a freeze concentration method, and the freeze concentration method is not particularly limited, and known methods can be used.

[0030] Another embodiment of the present invention is a plant extract obtained by the above-described production method. The plant extract according to this embodiment is characterized by low levels of impurities of a specific size. In particular, the plant extract obtained under the conditions of the above-described production method is advantageous in reducing the concentrations of unwanted components, such as components that are the source of potentially harmful components, such as nitrate-nitrogen proteins, which are precursors of tobacco-specific nitrosamines (TSNAs), and components that do not directly affect aroma, such as proteins found in many plants, such as Rubisco (RuBisCO), and is therefore preferred when using tobacco plants as the plant. In the plant extract according to this embodiment, the content of components of 50 Da (g / mol) or more and 50,000 Da or less in the tobacco extract is 15% by weight or less.

[0031] The viscosity of the plant extract at 25°C is not particularly limited, but from the viewpoint of ease of handling, it is usually 1.0 mPa s or more, more preferably 0.5 mPa s or more, and is usually 15.0 mPa s or less, preferably 6.5 mPa s or less. The viscosity is more preferably 6.0 mPa·s or less, and even more preferably 5.5 mPa·s or less. The viscosity is measured using a tuning fork vibration viscometer (A & Measurement can be performed using a SV-A (manufactured by Company D).

[0032] When the plant is tobacco leaves, the pH of the plant extract at 25°C is not particularly limited, but from the viewpoint of ease of use in tobacco products and oral pouch products, it is usually 7.5 or higher, preferably 8.0 or higher, more preferably 8.5 or higher, and more preferably 9.0 or lower. The pH of the oral composition at the measurement temperature of 25°C can be measured using a pH analyzer (e.g., HORIBA Ltd.'s LAQUA F-72 flat ISFET pH electrode) by adding 20 ml of water to 2 g of the oral composition, shaking for 10 minutes, and measuring the supernatant. The equipment is calibrated by three-point calibration using, for example, a phthalic acid pH standard solution (pH 4.01), a neutral phosphate pH standard solution (pH 6.86), and a borate pH standard solution (pH 9.18) (all from Wako Pure Chemical Industries).

[0033] The uses of the plant extract obtained by the above-mentioned production method are not particularly limited, and the plant extract can be used in a wide range of fields depending on the concentrated components. For example, when tobacco plants are used as the plants, a plant extract with concentrated nicotine can be produced by the above-mentioned extraction, cross-flow filtration, and electrodialysis, and can be used, for example, in tobacco products and oral pouch products described below.

[0034] <Tobacco product manufacturing method> Another embodiment of the present invention, a tobacco product manufacturing method (hereinafter simply referred to as "tobacco product manufacturing method"), is a tobacco product manufacturing method having a tobacco rod portion wrapped in cigarette paper that wraps a tobacco filler, and a mouthpiece portion, and includes a step of adding a plant extract produced by the above-mentioned plant extract manufacturing method to at least one selected from the group consisting of the tobacco filler and the cigarette paper. The tobacco product according to the present embodiment can be produced by a known method, except for the step of adding the plant extract, for example, by wrapping the tobacco rod and the mouthpiece in tipping paper. The step of adding the plant extract is not particularly limited, as long as it is carried out at any stage in the production of tobacco products where the plant extract can be added to the tobacco filler in the tobacco rod portion and / or the cigarette paper. For example, the plant extract may be added to the tobacco filler and / or the cigarette paper before the tobacco filler is wrapped in the cigarette paper, to the tobacco filler and / or the cigarette paper after wrapping, after the tobacco rod portion is produced, or after the tobacco rod portion and the mouthpiece portion are wrapped in tipping paper. The method of adding the plant extract to the tobacco filler and / or cigarette paper is not particularly limited. For example, the plant extract may be added dropwise to the tobacco filler and / or cigarette paper, the plant extract may be applied to the tobacco filler and / or cigarette paper, or the plant extract may be added to the tobacco filler and / or cigarette paper. Ko-charging The filler and / or cigarette paper may be soaked in the extract. Alternatively, the residue obtained when extracting the tobacco plant may be dried and then added with the plant extract, and this residue may be used as a tobacco filler. The extract residue obtained when tobacco plants are used as the plant in the extraction step in the production of the plant extract described above can be used as this residue. From the viewpoint of such reusability, it is preferable to produce the plant extract using tobacco plants. The method of adding the plant extract is not particularly limited, and in addition to the above-mentioned dripping, coating, and soaking, methods such as spraying and kneading may also be used. In order to ensure a sufficient amount of flavor components (e.g., nicotine), the amount of plant extract added per 100 parts by weight of the tobacco rod is typically 0.5 parts by weight or more, preferably 1.0 parts by weight or more, more preferably 2.0 parts by weight or more, and even more preferably 5.0 parts by weight or more, and is typically 20 parts by weight or less, preferably 15 parts by weight or less, more preferably 12.5 parts by weight or less, and even more preferably 10 parts by weight or less. When a plant extract is used in the tobacco product manufacturing method according to this embodiment, the type of plant is not particularly limited; for example, plant-derived flavoring components can be added to the tobacco product, but it is preferable to use tobacco plants, particularly from the viewpoint of being able to control the amount of nicotine. The tobacco product manufactured by the tobacco product manufacturing method according to this embodiment may be a cigarette or a non-combustion heated tobacco product. An example of a tobacco product will be described below, and each of the conditions is particularly advantageous for a non-combustion heated tobacco product.

[0035] An example of a tobacco product is shown in Figure 1. The tobacco product will be described below with reference to Figure 1. The rod-shaped tobacco product 10 shown in Fig. 1 is a rod-shaped tobacco product comprising a tobacco rod portion 11, a mouthpiece portion 14, and tipping paper 15 around which these are wound. The mouthpiece portion may take any form, but Fig. 1 shows an embodiment in which the mouthpiece portion comprises a cooling segment 12 and a filter segment 13 containing a filter medium, the cooling segment 12 being sandwiched adjacent to the tobacco rod portion 11 and the filter segment 13 in the axial direction (also referred to as the "longitudinal direction") of the tobacco product 10, and an opening V being provided concentrically in the circumferential direction of the cooling segment 12. The opening V is typically a hole for promoting the inflow of air from the outside when the user inhales, and this inflow of air can lower the temperature of the components and air flowing in from the tobacco rod portion 11. In the tobacco product 10, components generated by heating the tobacco rod portion 11 and the like are delivered to the user's mouth through the mouthpiece portion. Examples of components generated by heating include flavor components derived from flavorings, nicotine and tar derived from tobacco leaves, and aerosol components derived from the aerosol base. In this specification, the aerosol base refers to a base material for generating an aerosol.

[0036] The tobacco product 10 preferably has a cylindrical shape that satisfies an aspect ratio of 1 or greater, as defined below. Aspect ratio = h / w w is the width of the base of the columnar body (in this specification, this is the width of the base on the tobacco rod portion side), and h is the height, and it is preferable that h≧w. In this specification, the long axis direction is defined as the direction indicated by h. Therefore, even if w≧h, the direction indicated by h will be referred to as the long axis direction for convenience. The shape of the base is not limited and may be polygonal, rounded polygonal, circular, elliptical, or the like, and the width w is the diameter if the base is circular, the major axis if it is elliptical, or the diameter of the circumscribing circle or the major axis of the circumscribing ellipse if the base is polygonal or rounded polygonal. The length h of the tobacco product 10 in the longitudinal direction is not particularly limited, and is, for example, typically 40 mm or more, preferably 45 mm or more, and more preferably 50 mm or more, and typically 100 mm or less, preferably 90 mm or less, and more preferably 80 mm or less. The width w of the base of the column of the tobacco product 10 is not particularly limited, and is, for example, typically 5 mm or more, preferably 5.5 mm or more, and typically 10 mm or less, preferably 9 mm or less, and more preferably 8 mm or less. The ratio of the length of the cooling segment to the length of the filter segment in the longitudinal direction of the tobacco product (cooling segment:filter segment) is not particularly limited, but from the viewpoint of the amount of flavor delivered, it is usually 0.60:1.40-1.40:0.60, preferably 0.80-1.20:0.80-1.20, more preferably 0.85-1.15:0.85-1.15, more preferably 0.90-1.10:0.90-1.10, and even more preferably 0.95-1.05:0.95-1.05. By setting the ratio of the lengths of the cooling segment and the filter segment within the above range, a good balance can be achieved between the cooling effect, the effect of suppressing losses due to adhesion of generated steam and aerosol to the inner wall of the cooling segment, and the function of adjusting the air volume and flavor of the filter, thereby achieving a good flavor. In particular, if the cooling segment is long, the particulation of aerosols and the like is promoted, resulting in a good flavor, but if it is too long, substances passing through will adhere to the inner wall.

[0037] The longitudinal air resistance of each tobacco product 10 is not particularly limited, but from the standpoint of ease of smoking, it is usually 8 mmH2O or more, preferably 10 mmH2O or more, and more preferably 12 mmH2O or more, and is usually 100 mmH2O or less, preferably 80 mmH2O or less, and more preferably 60 mmH2O or less. Airflow resistance is measured in accordance with the ISO standard (ISO 6565:2015), using, for example, a filter airflow resistance measuring device manufactured by Cerulean. Airflow resistance refers to the difference in air pressure between one end face (first end face) and the other end face (second end face) of the tobacco product 10 when a predetermined air flow rate (17.5 cc / min) is flowed from the first end face to the second end face with no air permeation through the sides of the product. It is generally expressed in mmH2O. It is known that the relationship between airflow resistance and the length of a tobacco product is proportional within the commonly used length range (5 mm to 200 mm), meaning that doubling the length doubles the airflow resistance of the tobacco product.

[0038] [Mouthpiece] The embodiment of the mouthpiece portion 14 is not particularly limited, and may be, for example, as shown in Fig. 1, a configuration in which the mouthpiece portion 14 includes a cooling segment 12 and a filter segment 13 containing the above-mentioned filter medium, and the cooling segment 12 is sandwiched adjacent to the tobacco rod portion 11 and the filter segment 13 in the axial direction of the tobacco product 10. The filter segment 13 and the cooling segment 12 will be described in detail below.

[0039] (filter segment) The filter segment 13 is not particularly limited as long as it has the functions of a general filter, and can be, for example, a tow made of synthetic fiber (also simply referred to as "tow") or a cylindrical material such as paper. Typical filter functions include, for example, adjusting the amount of air mixed in when inhaling aerosols, reducing flavors, and reducing nicotine and tar, but it is not necessary for the filter to have all of these functions. Furthermore, in electrically heated tobacco products, which tend to produce fewer components and have a lower tobacco filler filling rate than cigarette products, one important function is to prevent the tobacco filler from falling out while suppressing filtration.

[0040] The shape of the filter segment 13 is not particularly limited, and any known shape can be adopted. Usually, the filter segment 13 can have a cylindrical shape, and can have the following forms. The filter segment 13 may also be provided with a section such as a cavity (such as a center hole) or a recess, which has a hollow (hollow) cross section in the circumferential direction.

[0041] The circumferential cross-sectional shape of the filter segment 13 is substantially circular, and the diameter of the circle can be changed appropriately depending on the size of the product, but is usually 4.0 mm to 9.0 mm, preferably 4.5 mm to 8.5 mm, and more preferably 5.0 mm to 8.0 mm. Note that if the cross section is not circular, the above diameter applies to a circle having the same area as the cross section, assuming that the circle has the same area as the cross section. The circumferential length of the circumferential cross-sectional shape of the filter segment 13 can be changed as appropriate to suit the size of the product, but is usually 14.0 mm or more and 27.0 mm or less, preferably 15.0 mm or more and 26.0 mm or less, and more preferably 16.0 mm or more and 25.0 mm or less. The axial length of the filter segment 13 can be changed appropriately according to the size of the product, but is usually 15 mm or more and 35 mm or less, preferably 17.5 mm or more and 32.5 mm or less, and more preferably 20.0 mm or more and 30.0 mm or less.

[0042] The airflow resistance per 120 mm of axial length of the filter segment 13 is not particularly limited, but is typically 40 mmH2O or more and 300 mmH2O or less, preferably 70 mmH2O or more and 280 mmH2O or less, and more preferably 90 mmH2O or more and 260 mmH2O or less. The airflow resistance of the filter segment 13 can be measured using the same method as the method for measuring the airflow resistance of the tobacco product 10 described above.

[0043] Furthermore, the form of the filter segment 13 is not particularly limited, and it can be a plain filter including a single filter segment, or a multi-segment filter including multiple filter segments such as a dual filter or triple filter. When a multi-segment filter is used, it can be provided with a filter segment including the coolant according to one embodiment of the present invention and a filter segment including a filter medium.

[0044] The density of the filter material constituting the filter segment 13 is not particularly limited, but is usually 0.10 g / cm 3 More than 0.25g / cm 3 less than 0.11 g / cm 3 More than 0.24g / cm 3 Preferably, it is 0.12 g / cm or less. 3 More than 0.23g / cm 3 More preferably, it is:

[0045] The filter material contained in the filter segment 13 is not particularly limited, and known embodiments may be employed. For example, cellulose acetate tow processed into a cylindrical shape may be used. The single-filament fineness and total fineness of the cellulose acetate tow are not particularly limited. However, in the case of a mouthpiece member having a circumference of 22 mm, the single-filament fineness is preferably 5 g / 9000 m or more and 12 g / 9000 m or less, and the total fineness is preferably 12000 g / 9000 m or more and 35000 g / 9000 m or less. Examples of the cross-sectional shape of the cellulose acetate tow fibers include circular, elliptical, Y-shaped, I-shaped, and R-shaped. In the case of a filter filled with cellulose acetate tow, triacetin may be added in an amount of 5 wt. % or more and 10 wt. % or less of the cellulose acetate tow weight to improve filter hardness. Alternatively, a paper filter filled with sheet-shaped pulp paper may be used instead of the acetate filter.

[0046] The filter segment 13 can be produced by a known method. For example, when synthetic fibers such as cellulose acetate tow are used as the material of the filter medium, the filter segment 13 can be produced by spinning a polymer solution containing a polymer and a solvent and crimping the solution. For example, the method described in WO 2013 / 067511 can be used.

[0047] The filter medium may include a crushable additive-release container (e.g., a capsule) that includes a crushable outer shell such as gelatin. The form of the capsule (also referred to in the art as an "additive-release container") is not particularly limited and may be any known form, for example, a crushable additive-release container that includes a crushable outer shell such as gelatin. In this case, when the capsule is broken by a tobacco product user before, during, or after use, it releases a liquid or substance (usually a flavoring agent) contained within the capsule, which is then transmitted to tobacco smoke while the tobacco product is being used and to the surrounding environment after use. The form of the capsule is not particularly limited, and may be, for example, a frangible capsule, preferably spherical in shape. The additive contained in the capsule may include any of the additives described above, and preferably includes flavoring agents and activated carbon. One or more materials that help filter smoke may also be added as additives. The form of the additive is not particularly limited, but is usually liquid or solid. The use of capsules containing additives is well known in the art. Frangible capsules and methods for manufacturing them are well known in the art. The flavoring agent may be, for example, menthol, spearmint, peppermint, fenugreek, or clove, medium chain triglycerides (MCT), etc. The flavoring agent may be menthol, or menthol, etc., or a combination thereof.

[0048] To improve strength and structural rigidity, the filter segment 13 may include a wrapper (filter plug wrapper) around which the filter material described above is wrapped. The wrapper may include one or more rows of adhesive seams. The adhesive may include a hot-melt adhesive, which may further include polyvinyl alcohol. When the filter is made up of two or more segments, the wrapper preferably wraps these two or more segments together. The material of the wrapper is not particularly limited, and known materials can be used, and may contain fillers such as calcium carbonate. The thickness of the wrapper is not particularly limited, and is usually 20 μm or more and 140 μm or less, preferably 30 μm or more and 130 μm or less, and more preferably 30 μm or more and 120 μm or less. The basis weight of the paper roll is not particularly limited, and is usually 20 gsm or more and 100 gsm or less, preferably 22 gsm or more and 95 gsm or less, and more preferably 23 gsm or more and 90 gsm or less. The wrapper may be either coated or uncoated, but is preferably coated with a desired material from the viewpoint of imparting functions other than strength and structural rigidity.

[0049] The filter segment 13 may further include a center hole segment having one or more hollow portions. The center hole segment is usually located closer to the cooling segment than the filter medium, and preferably adjacent to the cooling segment.

[0050] (Cooling segment) The cooling segment 12 is sandwiched adjacent to the tobacco rod portion and the filter segment, and is typically a rod-shaped member provided with a cavity such that the cross section in the circumferential direction is hollow (hollow), such as a cylinder.

[0051] The length of the cooling segment 12 in the longitudinal direction can be changed appropriately depending on the size of the product, but is usually 20 mm or more, preferably 26 mm or more, more preferably 28 mm or more, and even more preferably 32 mm or more, and is usually 40 mm or less, preferably 32 mm or less, more preferably 28 mm or less, and even more preferably 26 mm or less. By setting the length of the cooling segment in the longitudinal direction to be equal to or greater than the above-mentioned lower limit, a sufficient cooling effect can be ensured to obtain a good flavor, and by setting it to be equal to or less than the above-mentioned upper limit, loss of generated steam and aerosol due to adhesion to the inner wall of the cooling segment can be suppressed. The circumferential length of the circumferential cross-sectional shape of the cooling segment 12 can be changed as appropriate to suit the size of the product, but is usually 15 mm or more and 30 mm or less, preferably 18 mm or more and 24 mm or less, and more preferably 20 mm or more and 22.5 mm or less.

[0052] As shown in FIG. 1, the cooling segment 12 may be provided with openings V (also referred to as "ventilation filters (Vf)" in the technical field) in a circumferential and concentric manner. The presence of the openings V allows air to flow into the cooling section from the outside during use, lowering the temperature of the components and air flowing in from the tobacco rod section. Furthermore, by positioning the cooling segment within an area 4 mm or more from the boundary between the cooling segment and the filter segment toward the cooling segment, not only is the cooling capacity improved, but the retention of components generated by heating within the cooling segment is suppressed, thereby improving the delivery amount of the components. In addition, when an aerosol base material is used in the tobacco rod portion, the vapor containing the aerosol base material and tobacco flavor components generated by heating the tobacco rod portion comes into contact with air from outside and its temperature drops, liquefying, thereby facilitating the generation of the aerosol.

[0053] The diameter of the openings V is not particularly limited, but is preferably 100 μm or more and 1000 μm or less, and more preferably 300 μm or more and 800 μm or less. The openings are preferably approximately circular or approximately elliptical, and in the case of an approximately elliptical opening, the diameter indicates the major axis.

[0054] [Tobacco rod part] The tobacco rod portion 11 may be of any known form, but is typically formed by wrapping a tobacco filler in cigarette paper. The tobacco filler is not particularly limited, and known materials such as tobacco shreds and reconstituted tobacco sheets can be used. The tobacco filler may also contain an aerosol base. The aerosol base is a base material that generates an aerosol when heated, and examples of the aerosol base include glycerin, propylene glycol, triacetin, 1,3-butanediol, and mixtures thereof. The content of the aerosol base material in the tobacco filler is not particularly limited, but from the viewpoint of generating sufficient aerosol and imparting a good flavor, it is usually 5% by weight or more, preferably 10% by weight or more, and usually 50% by weight or less, preferably 15% by weight or more and 25% by weight or less, relative to the total amount of the tobacco filler.

[0055] The tobacco rod portion 11 may also have a fitting portion for fitting with a heater member or the like for heating the tobacco product 10. The tobacco rod portion 11, which is formed by wrapping a tobacco filler in cigarette paper, preferably has a columnar shape, and in this case, it is preferable that the aspect ratio, which is represented by the height in the longitudinal direction of the tobacco rod portion 11 relative to the width of the bottom surface of the tobacco rod portion 11, is 1 or more. The shape of the bottom is not limited and may be polygonal, rounded polygonal, circular, elliptical, etc., and the width is the diameter when the bottom is circular, the major axis when the bottom is elliptical, and the diameter of the circumscribed circle or the major axis of the circumscribed ellipse when the bottom is polygonal or rounded polygonal. The height of the tobacco filler constituting the tobacco rod portion 11 is preferably about 10 to 70 mm, and the width is preferably about 4 to 9 mm.

[0056] The length of the tobacco rod portion 11 in the longitudinal direction can be varied appropriately depending on the size of the product, but is usually 10 mm or more, preferably 12 mm or more, more preferably 15 mm or more, and even more preferably 18 mm or more, and is usually 70 mm or less, preferably 50 mm or less, more preferably 30 mm or less, and even more preferably 25 mm or less. From the viewpoint of the balance between the delivery amount and the aerosol temperature, the ratio of the length of the tobacco rod portion 11 to the longitudinal length h of the tobacco product 10 is usually 10% or more, preferably 20% or more, more preferably 25% or more, and even more preferably 30% or more, and is usually 60% or less, preferably 50% or less, more preferably 45% or less, and even more preferably 40% or less.

[0057] (rolling paper) The cigarette paper is not particularly limited in composition and may be of a general type, for example, one containing pulp as the main component. Pulp may be made from wood pulp such as softwood pulp or hardwood pulp, or may be made by mixing non-wood pulp commonly used in cigarette papers for tobacco products, such as flax pulp, hemp pulp, sisal pulp, or esparto. Usable types of pulp include chemical pulp produced by kraft cooking, acidic, neutral or alkaline sulfite cooking, soda cooking, etc., ground pulp, chemi-ground pulp, thermomechanical pulp, etc.

[0058] The above pulp is used to produce cigarette paper by adjusting and uniforming the texture during the papermaking process using a Fourdrinier paper machine, a cylinder paper machine, a combined cylinder / short-cylinder paper machine, or the like. If necessary, a wet strength agent may be added to impart water resistance to the cigarette paper, or a sizing agent may be added to adjust the printing quality of the cigarette paper. Furthermore, internal papermaking aids such as aluminum sulfate, various anionic, cationic, nonionic, or amphoteric retention aids, drainage aids, and paper strength agents, as well as papermaking additives such as dyes, pH adjusters, antifoaming agents, pitch control agents, and slime control agents, may be added.

[0059] The basis weight of the cigarette paper base paper is, for example, usually 20 gsm or more, preferably 25 gsm or more, while the basis weight is usually 65 gsm or less, preferably 50 gsm or less, and more preferably 45 gsm or less. The thickness of the cigarette paper having the above-mentioned properties is not particularly limited, and from the viewpoints of rigidity, breathability, and ease of adjustment during papermaking, it is usually 10 μm or more, preferably 20 μm or more, and more preferably 30 μm or more, and is usually 100 μm or less, preferably 75 μm or less, and more preferably 50 μm or less. The shape of the tobacco product wrapping paper can be square or rectangular. When used as cigarette paper for wrapping a tobacco filler (to produce a tobacco rod), the length of one side can be approximately 12 to 70 mm, and the length of the other side can be 15 to 28 mm, with a preferred length of 22 to 24 mm, and a more preferred length of approximately 23 mm. When wrapping a tobacco filler in cigarette paper in a cylindrical shape, for example, the end of the cigarette paper in the w direction and the end on the opposite side are overlapped by approximately 2 mm and glued together to form a cylindrical paper tube shape into which the tobacco filler is filled. The size of the rectangular cigarette paper can be determined depending on the size of the finished tobacco rod 11. When the tobacco rod portion 11 and other components adjacent to the tobacco rod portion 11 are connected and wound together, such as tipping paper, the length of one side may be 20 to 60 mm and the length of the other side may be 15 to 28 mm.

[0060] In addition to the pulp, the cigarette paper may contain a filler, the content of which may be 10% by weight or more and less than 60% by weight, preferably 15% by weight or more and 45% by weight or less, based on the total weight of the cigarette paper. In the cigarette paper, the filler content is preferably 15% by weight or more and 45% by weight or less within the preferred basis weight range (25 gsm or more and 45 gsm or less). Furthermore, when the basis weight is 25 gsm or more and 35 gsm or less, the filler content is preferably 15 wt% or more and 45 wt% or less, and when the basis weight is more than 35 gsm and 45 gsm or less, the filler content is preferably 25 wt% or more and 45 wt% or less. As the filler, calcium carbonate, titanium dioxide, kaolin, etc. can be used, but calcium carbonate is preferably used from the viewpoint of enhancing flavor and whiteness.

[0061] Various auxiliary agents other than base paper and fillers may be added to the cigarette paper. For example, a water resistance improver may be added to improve water resistance. Water resistance improvers include wet strength agents (WS agents) and sizing agents. Examples of wet strength agents include urea-formaldehyde resin, melamine-formaldehyde resin, and polyamide epichlorohydrin (PAE). Examples of sizing agents include rosin soap, alkyl ketene dimer (AKD), alkenyl succinic anhydride (ASA), and highly saponified polyvinyl alcohol with a saponification degree of 90% or more. A paper strength agent may be added as an auxiliary, and examples thereof include polyacrylamide, cationic starch, oxidized starch, CMC, polyamide epichlorohydrin resin, polyvinyl alcohol, etc. In particular, it is known that the use of a very small amount of oxidized starch improves air permeability (Japanese Patent Laid-Open Publication No. 2017-218699). The wrapping paper may also be coated as appropriate.

[0062] [Tip paper] The composition of the tipping paper 15 is not particularly limited and can be any common embodiment, such as one containing pulp as the main component. Pulp may be made from wood pulp such as softwood pulp or hardwood pulp, or may be made by mixing non-wood pulp commonly used in cigarette papers for tobacco products, such as flax pulp, hemp pulp, sisal pulp, or esparto. These pulps may be used alone or in any combination of two or more types in any ratio. The tipping paper 15 may be made up of one sheet, or may be made up of multiple sheets or more. Usable pulp types include chemical pulp produced by kraft cooking, acidic, neutral or alkaline sulfite cooking, soda cooking, etc., ground pulp, chemi-ground pulp, thermomechanical pulp, etc. The tipping paper 15 may be produced by the production method described below, or may be a commercially available product.

[0063] The shape of the tipping paper 15 is not particularly limited, and can be, for example, square or rectangular. The basis weight of the tipping paper 15 is not particularly limited, but is usually 32 gsm or more and 40 gsm or less, preferably 33 gsm or more and 39 gsm or less, and more preferably 34 gsm or more and 38 gsm or less. The thickness of the tipping paper 15 is not particularly limited, and is usually 20 μm or more and 140 μm or less, preferably 30 μm or more and 130 μm or less, and more preferably 30 μm or more and 120 μm or less. The air permeability of the tipping paper 15 is not particularly limited, but is usually 0 Coresta units or more and 30,000 Coresta units or less, and is preferably more than 0 Coresta units and 10,000 Coresta units or less. Note that the air permeability referred to in this specification is a value measured in accordance with ISO 2965:2009, and is the value of the air permeability of an area of ​​1 cm per minute when the differential pressure between both sides of the paper is 1 kPa. 2 Flow rate of gas passing through (cm 3 ) 1 C.U. is equal to cm under 1 kPa. 3 / (min·cm 2 )

[0064] In addition to the pulp, the tipping paper 15 may contain fillers, such as metal carbonates such as calcium carbonate and magnesium carbonate, metal oxides such as titanium oxide, titanium dioxide and aluminum oxide, metal sulfates such as barium sulfate and calcium sulfate, metal sulfides such as zinc sulfide, quartz, kaolin, talc, diatomaceous earth, gypsum, etc. In particular, calcium carbonate is preferred from the viewpoints of improving whiteness and opacity and increasing the heating rate. These fillers may be used alone or in combination of two or more.

[0065] In addition to the pulp and filler, various auxiliary agents may be added to the tip paper 15. For example, Water resistanceTo improve the water resistance of the paper, the paper may contain a water resistance improver. Water resistance improvers include wet strength agents (WS agents) and sizing agents. Examples of wet strength agents include urea-formaldehyde resins, melamine-formaldehyde resins, and polyamide epichlorohydrin (PAE). Examples of sizing agents include rosin soap, alkyl ketene dimer (AKD), alkenyl succinic anhydride (ASA), and highly saponified polyvinyl alcohol with a saponification degree of 90% or more.

[0066] A coating agent may be added to at least one of the two surfaces, the front and back surfaces, of the tipping paper 15. There are no particular restrictions on the coating agent, but a coating agent that can form a film on the surface of the paper and reduce liquid permeability is preferred.

[0067] <Manufacturing method for electrically heated tobacco products> A method for manufacturing an electrically heated tobacco product according to another embodiment of the present invention (also simply referred to as a "method for manufacturing an electrically heated tobacco product") comprises an electrically heated device including a heater element, a battery unit that serves as a power source for the heater element, and a control unit that controls the heater element, and a tobacco product that is inserted so as to come into contact with the heater element. A method for manufacturing an electrically heated tobacco product comprising: an electrically heated tobacco product, wherein the tobacco product is manufactured by the above-mentioned tobacco product manufacturing method; Manufacturing method is. The electrically heated tobacco product may be configured to heat the outer peripheral surface of the tobacco product 10, as shown in Fig. 2, or may be configured to heat from the inside of the tobacco rod portion 11 of the tobacco product 10, as shown in Fig. 3. The electrically heated device 20 shown in Figs. 2 and 3 is provided with air introduction holes, but these are not shown here. Below, the electrically heated tobacco product 30 will be described using Fig. 3. Note that for the tobacco product 10 in Figs. 2 and 3, some of the reference numerals representing the components shown in Fig. 1 have been omitted. The electrically heated tobacco product 30 is used by inserting the tobacco product 10 described above into contact with the heater member 21 arranged inside the electrically heated device 20. The electric heating device 20 has a battery unit 22 and a control unit 23 inside a body 24 made of, for example, resin. When the tobacco product 10 is inserted into the electrically heated device 20, the outer surface of the tobacco rod portion 11 comes into contact with the heater element 21 of the electrically heated device 20, and eventually the entire outer surface of the tobacco rod portion 11 and part of the outer surface of the tipping paper come into contact with the heater element 21. The heater member 21 of the electrically heated device 20 generates heat under the control of the control unit 23. The heat is transferred to the tobacco rod portion 11 of the tobacco product 10, causing the aerosol base material, flavor components, and the like contained in the tobacco filler of the tobacco rod portion 11 to volatilize.

[0068] The heater element 21 may be, for example, a sheet-shaped heater, a flat-plate heater, or a cylindrical heater. A sheet-shaped heater is a flexible sheet-shaped heater, such as a heater including a film (thickness: approximately 20 to 225 μm) of a heat-resistant polymer such as polyimide. A flat-plate heater is a rigid, flat-plate heater (thickness: approximately 200 to 500 μm), such as a heater having a resistance circuit on a flat substrate, with that portion serving as a heat generating portion. A cylindrical heater is a hollow or solid cylindrical heater (thickness: approximately 200 to 500 μm), such as a heater having a resistance circuit on the outer circumferential surface of a metal or other cylinder, with that portion serving as a heat generating portion. Other examples include rod-shaped and cone-shaped heaters made of metal or other materials, with a resistance circuit inside and that portion serving as a heat generating portion. The cross-sectional shape of the cylindrical heater may be circular, elliptical, polygonal, rounded polygonal, or the like. It is also possible to employ an embodiment in which the heater element 21 includes an inductor and a susceptor for heating a tobacco filler or the like is introduced into the tobacco rod portion 11. In this embodiment, the control unit 23 supplies power to the inductor, and the susceptor is heated by induction heating, thereby heating the tobacco filler, etc. Also, a microwave generator may be provided as the heater member 21. In this embodiment, the control unit 23 supplies power to the microwave generator, and the tobacco filler, etc. in the tobacco rod portion 11 can be heated by microwave heating. The above-mentioned sheet-shaped heater, flat-shaped heater, and cylindrical heater can be used in the case of heating the outer peripheral surface of the tobacco product 10 as shown in Fig. 2. On the other hand, the above-mentioned flat-shaped heater, columnar heater, and cone-shaped heater can be used in the case of heating the tobacco rod portion 11 of the tobacco product 10 from the inside as shown in Fig. 3. The length of the heater element 21 in the longitudinal direction can be within a range of Lmm ±5.0mm, where Lmm is the length of the tobacco rod portion 11 in the longitudinal direction. From the viewpoint of sufficient heat transfer to the tobacco rod portion 11 and sufficient volatilization of the aerosol base material, flavor components, and the like contained in the tobacco filler, i.e., aerosol delivery, the length of the heater element 21 in the longitudinal direction is preferably Lmm or more, and from the viewpoint of suppressing the generation of components that undesirably affect the flavor, etc., the length is preferably Lmm + 0.5mm or less, Lmm + 1.0mm or less, Lmm + 1.5mm or less, Lmm + 2.0mm or less, Lmm + 2.5mm or less, Lmm + 3.0mm or less, Lmm + 3.5mm or less, Lmm + 4.0mm or less, Lmm + 4.5mm or less, or Lmm + 5.0mm or less.

[0069] The heating intensity, such as the heating time and heating temperature of the tobacco product 10 by the heater member 21, can be set in advance for each electrically heated tobacco product 30. For example, by pre-heating the tobacco product 10 for a certain period of time after it is inserted into the electrically heated device 20, the temperature of the outer surface of the part of the tobacco product 10 that is inserted into the electrically heated device 20 can be heated to X (°C), and thereafter the temperature can be set in advance to be maintained at a constant temperature of X (°C) or less. From the viewpoint of the delivery amount of components generated by heating, the above X (°C) is preferably 80°C or higher and 400°C or lower. Specifically, the temperature can be 80°C, 90°C, 100°C, 110°C, 120°C, 130°C, 140°C, 150°C, 160°C, 170°C, 180°C, 190°C, 200°C, 210°C, 220°C, 230°C, 240°C, 250°C, 260°C, 270°C, 280°C, 290°C, 300°C, 310°C, 320°C, 330°C, 340°C, 350°C, 360°C, 370°C, 380°C, 390°C, or 400°C. When heated by the heater element 21, vapor containing components derived from the aerosol base material and components derived from flavor components is generated from the tobacco rod portion 11 and reaches the user's oral cavity through the mouthpiece portion 14, which is composed of a cooling segment 12, a filter segment 13, etc.

[0070] From the viewpoints of promoting the inflow of air from the outside and preventing components and air generated by heating from accumulating within the cooling segment 12, the opening V provided in the cooling segment 12 is preferably located closer to the mouth end than the end of the region of the cooling segment 12 that comes into contact with the electrically heating device 20. The insertion opening of the electrically heating device 20 for the tobacco product 10 may be tapered to make it easier to insert the tobacco product 10.

[0071] <Manufacturing method for oral pouch products> Another embodiment of the present invention, a method for producing an oral pouch product (hereinafter simply referred to as "method for producing an oral pouch product"), is a method for producing an oral pouch product having an oral composition and a pouch for packaging the oral composition, and includes a step of adding a plant extract produced by the above-mentioned method for producing a plant extract to the oral composition. The step of adding the plant extract described above is not particularly limited, as long as it can be performed at any stage in the production of an oral pouch product where the plant extract can be added to the oral composition. For example, the plant extract may be added together with other ingredients during the production of the oral composition in the oral composition production process described below, or may be added to the produced oral composition through the packaging material during the packaging process described below. Alternatively, the plant extract may be added to the dried residue obtained during tobacco plant extraction, and this residue may be incorporated into the oral composition. This residue can be the extraction residue obtained when tobacco plants are used as the plant in the extraction step in the production of the plant extract described above. From the perspective of such reusability, it is preferable to produce the plant extract using tobacco plants. When adding the plant extract to the dried residue, other ingredients such as flavorings, pH adjusters, and, in some cases, emulsifiers can also be added to produce an oral composition, which can then be packaged in a pouch to produce an oral pouch product. When a plant extract is used in the method for producing an oral pouch product according to this embodiment, the type of plant is not particularly limited, and for example, a plant-derived flavor component can be added to the oral pouch product, but in particular, when a smokeless tobacco product is produced, it is preferable to use a tobacco plant from the viewpoint of being able to control the amount of nicotine. When a smokeless tobacco product is produced, nicotine can be added to the oral pouch product as a plant extract using a tobacco plant as the plant, or by adding a nicotine component described below, or both of these may be used, but from the viewpoint of controlling the amount of nicotine and ease of handling, it is preferable to add it as a plant extract using at least a tobacco plant as the plant. In order to ensure a sufficient amount of flavor components (e.g., nicotine), the amount of plant extract added per 100 parts by weight of the oral composition is usually 0.1 parts by weight or more, preferably 1 part by weight or more, more preferably 3 parts by weight or more, even more preferably 5 parts by weight or more, and particularly preferably 10 parts by weight or more, and is usually 50 parts by weight or less, preferably 40 parts by weight or less, more preferably 35 parts by weight or less, and even more preferably 20 parts by weight or less. The method for producing the oral pouch product according to this embodiment can be a known method, except for the step of adding the plant extract. The production process excluding the step of adding the plant extract may include, for example, the following oral composition production step and packaging step.

[0072] [Oral composition manufacturing process] The method for producing an oral pouch product may include a step of producing an oral composition. An example of the method for producing the oral composition is shown below. The raw materials shown below can be the raw materials described below. First, a nicotine source, an optional base material, and the like are mixed in a mixer to obtain a mixture. If necessary, water may be added and heating may be performed. Next, optional ingredients such as a fragrance and a moisturizer are added, and the mixture is further stirred and mixed to obtain a mixture. The acid may be added at the same time as the subsequent stirring and mixing. The pH of the mixture is preferably adjusted, and the amount of the phosphate or other pH adjuster added is preferably adjusted so that the mixture is acidic. Specifically, the pH of the mixture is preferably 2.0 to 6.0, more preferably 2.5 to 5.0. By adjusting the pH of the oral composition to 6.0 or less, the flavor components (eg, nicotine) contained in the mixture can be maintained in a stable state.

[0073] The pre-heating mixture may be subjected to a heating treatment as required. After preparing the mixture, the mixture may be dried (drying step). The mixture may then be cooled. Cooling may be achieved by natural cooling or by using some cooling means (cooling step). By drying, the water content of the mixture can be adjusted to a desired value between 5 and 55% by weight, for example. This facilitates the adjustment of the water content of the desired oral composition.

[0074] An aqueous solution containing a pH adjuster may be further added to the mixture obtained in the above step (or the drying step or cooling step) to adjust the pH at a measurement temperature of 25°C to preferably 7 to 10, more preferably 7.5 to 9.5, and even more preferably 8 to 9. Furthermore, sweeteners such as acesulfame potassium, flavorings such as menthol, bitterness suppressants such as soybean lecithin, and moisturizers such as glycerin are added as appropriate (additive addition step) to obtain the desired oral composition. When adding the additives, they may be added in the form of a solid or an aqueous solution in which they are dissolved in water. When adding them in the form of an aqueous solution, they may be added by dissolving them in a predetermined amount of water in advance so that the final moisture content of the pouch product is achieved.

[0075] [Packaging process] The oral composition obtained in the oral composition preparation step is packaged in a packaging agent to obtain a pouch product (packaging step). The packaging method is not particularly limited, and known methods can be applied, such as a method in which the oral composition is placed in a bag-shaped nonwoven fabric and then sealed. In the packaging process, after the oral composition is placed in the packaging material and the packaging material is sealed, further water may be added to obtain an oral composition with a desired water content (water addition process). For example, if the water content of the target oral composition is 50 wt % and the water content of the oral composition obtained in the oral composition preparation process is 15 wt %, the remaining 35 wt % of water is added.

[0076] An example of an oral pouch product will be described below. The oral pouch product is, for example, an oral pouch product having an oral composition containing a base material and a pouch for packaging the oral composition.

[0077] [Oral composition] The composition of the oral composition is not particularly limited as long as it contains at least a base material. In this embodiment, the oral composition is a general term for any substance contained in the pouch. In addition, from the viewpoint of preventing leakage of the oral composition outside the pouch, the oral composition is preferably not a liquid, and is preferably, for example, a solid or gel substance, or a mixture thereof.

[0078] (base material) The oral composition contains a base material. The type of base material is not particularly limited, and polysaccharides, porous structures, and the like that can adsorb and retain moisture can be used. Specifically, the base material is preferably one or more selected from the group consisting of cellulose, microcrystalline cellulose (MCC), spherical cellulose, and porous cellulose, and cellulose is more preferred from the viewpoint of the degree of freedom in adjusting the bulk density of the oral composition and its white color. One of these substances may be used alone, or two or more types may be used in any combination and in any ratio. The content of the base material in the oral composition is not particularly limited, but from the viewpoint of improving quality by suppressing water elution during production or product storage, and of increasing the whiteness of the product to give it an appearance that is desirable to users, it is usually 50% by weight or more, preferably 53% by weight or more, and more preferably 55% by weight or more, and although there is no particular upper limit, from the viewpoint of the limit to which other ingredients can be blended, it is usually 70% by weight or less, preferably 68% by weight or less, and more preferably 65% ​​by weight or less.

[0079] (nicotine) When the oral pouch product is used for smokeless tobacco or the like, the oral composition may contain nicotine, and the manner in which nicotine is contained is not particularly limited, and nicotine may be added by adding a plant extract using a tobacco plant as the plant. Alternatively, or in addition, nicotine may be contained in the oral composition by a method other than the use of a plant extract. The manner in which nicotine is contained by a method other than the addition of a plant extract is not particularly limited, and, for example, nicotine may be contained by using tobacco leaves, processed tobacco leaves, or an extract of a nicotine-containing substance such as tobacco leaves, or nicotine may be contained as a compound, or a nicotine-carrying substance such as a nicotine salt or stabilized nicotine (for example, nicotine supported on an ion exchange resin).

[0080] As a nicotine-carrying substance, a substance in which nicotine is carried on an ion exchange resin as described above can be mentioned. When nicotine is carried on an ion exchange resin, an ion exchange resin is used as a carrier. As an ion exchange resin, a weakly acidic cation exchange resin can be mentioned. As an ion exchange resin carrying nicotine (hereinafter also simply referred to as a "nicotine-carrying resin"), a resin complex called nicotine polacrilex, which contains, for example, 10% by weight or more and 20% by weight or less of nicotine, can be used. The ion exchange resin used in nicotine polacrilex is a weakly acidic cation exchange resin.

[0081] When a processed tobacco leaf product is used as a nicotine supply source, examples of the processed product include tobacco powder obtained by pulverizing tobacco leaves. Tobacco powder may include shredded dried tobacco leaf lamina, fine powder, fiber, etc., and can be prepared by the following method. In this specification, tobacco leaves may include mesophyll (lamina), leaf veins (stems), and roots. The tobacco filler may also include elements derived from the midrib and roots of tobacco leaves, in addition to tobacco powder, which is basically obtained from tobacco leaf lamina. There are no particular restrictions on the particle size of the tobacco powder, but from the standpoint of improving compatibility in the oral cavity to enhance usability and improving the release of flavor and aroma components contained in the tobacco powder into the oral cavity, it is preferable that the powder has passed through a 1.2 mm mesh, and more preferably has passed through a 1.0 mm mesh. The tobacco species used as the raw material for tobacco powder are not particularly limited, and examples include the genus Nicotiana, such as the flue-cured Nicotiana tabacum, the Burley variety, and the Brasilia variety of Nicotiana rustica. The same species can also be used for the tobacco material and tobacco leaves described below.

[0082] Tobacco powder is preferably obtained as follows. First, a base is added to tobacco powder obtained by grinding tobacco leaves and mixed. The base to be added may be potassium carbonate and / or sodium carbonate, and is preferably added as an aqueous solution. A pH adjuster such as sodium dihydrogen phosphate may also be added. After the addition of the base, the pH of the mixture is preferably adjusted to 8.0 to 9.0. The tobacco powder content in this mixture can be 60 to 90% by weight. After the base is added, the mixture is heated for, for example, 0.5 to 3 hours, preferably 0.8 to 2 hours, under conditions such that the product temperature reaches 65 to 90° C., preferably 70 to 80° C. This sterilizes the tobacco powder. Heating can be achieved by steam injection and / or jacket heating. The pH of the mixture after heating is preferably 8.0 to 9.0, and the water content of the mixture after heating is preferably 10 to 50% by weight. After heating, the resulting treated tobacco powder is dried by stopping the steam injection as needed and heating only the jacket. Thereafter, the mixture may be cooled at about 15 to 25°C for about 1 hour.

[0083] When a tobacco material containing tobacco powder is used, the amount added to the oral composition is typically 0.001% by weight or more, preferably 0.01% by weight or more, and more preferably 0.05% by weight or more, relative to the oral composition. From the standpoint of the flavor of the oral composition, the amount of tobacco material containing tobacco powder added to the oral composition is typically 90% by weight or less, preferably 80% by weight or less, and more preferably 70% by weight or less. Furthermore, the amount of tobacco material containing tobacco powder added to the oral composition may be 45% by weight or less, 40% by weight or less, or 30% by weight or less.

[0084] Among the various modes of adding nicotine to the oral composition described above, the addition of a nicotine-carrying substance is preferred from the viewpoints of accurate nicotine supply and ease of handling. Furthermore, while the addition of tobacco powder usually tends to result in oral compositions and pouch products with the color of tobacco leaves, the use of a colorless nicotine-containing compound makes it possible to provide oral compositions and pouch products with a white color. This mode is advantageous for users who prefer white pouch products. The above-mentioned aspects may be applied singly or in combination of two or more aspects.

[0085] The content of nicotine (including nicotine derived from plant extracts) in the oral composition is not particularly limited, but from the viewpoint of user preference, it is usually 0.20% by weight or more, preferably 1.0% by weight or more, and more preferably 2.5% by weight or more, and is usually 7.0% by weight or less, preferably 5.0% by weight or less, and more preferably 4.0% by weight or less. The same range of nicotine content can be applied regardless of whether the nicotine source is, for example, a substance in which nicotine is supported on the above-mentioned ion exchange resin, a tobacco material containing tobacco powder, or a nicotine-containing extract. When nicotine is present as an ion, the above content is the content of the nicotine ion. The nicotine content in the oral composition can be measured by gas chromatography mass spectrometry (GC-MS), liquid chromatography (LC, UV detection), or the like.

[0086] (Other substances) The oral composition may contain substances other than the above-mentioned base material and nicotine (other substances), such as humectants, pH adjusters, gelling agents, gelling aids, water, flavorings, sweeteners, bitterness suppressants, whitening agents, emulsifiers, etc. The content of other substances in the oral composition is not particularly limited, and for substances for which no preferred content is specified, the composition can be adjusted appropriately depending on the product design.

[0087] The type of moisturizer is not particularly limited, and examples thereof include glycerin, propylene glycol, petrolatum, lactic acid, etc. It is preferable to include at least one selected from these groups, and glycerin is preferred from the viewpoint of product shelf life. These substances may be used alone or in any combination of two or more types in any type and ratio.

[0088] The oral composition may contain a pH adjuster, for example, sodium carbonate, sodium bicarbonate, potassium carbonate, potassium bicarbonate, anhydrous sodium phosphate, sodium dihydrogen phosphate, sodium citrate, etc.

[0089] As the gelling agent, for example, polysaccharides having carboxyl groups are preferred, specifically carrageenan, pectin, gum arabic, xanthan, gellan, tragacanth gum, and alginic acid are preferred, and carrageenan, pectin, gellan, and alginic acid are more preferred from the viewpoint that they are likely to gel in the presence of calcium ions and can form a junction zone between the carboxyl groups and cations to form a crosslinked structure. Among these, LM pectin is preferred for the reasons described below. These substances may be used alone, or two or more may be used in any combination and in any ratio.

[0090] Examples of gelling aids include calcium ions, and their supply sources (gelling aids) are not particularly limited, but include, for example, calcium halides (chlorides, etc.), citric acid, carbonates, sulfates, phosphates, lactates, etc. Among these, calcium lactate, calcium carbonate, and calcium phosphate are preferred, with calcium lactate being particularly preferred, from the viewpoints of their minimal effect on the taste of the pouch product, their high solubility, and the pH after dissolution. These substances may be used alone, or two or more may be used in any combination and in any ratio. Examples of gelation aids other than calcium ions include metal ions such as magnesium, silver, zinc, copper, gold, and aluminum, which can bond with gelling agents through ionic bonds like calcium ions, and ions of cationic polymers, and examples of sources of these (other gelation aids) include halide salts (chlorides, etc.) of these metal ions, citric acid, carbonates, sulfates, phosphates, cationic polymers, etc. One of these substances may be used alone, or two or more may be used in combination in any type and ratio.

[0091] The oral composition may contain water, and the water content (moisture content) in the oral composition is usually 15% by weight or more. If the moisture content is less than 15% by weight, the oral composition is likely to have a rough texture, and the oral composition is difficult to manufacture. Furthermore, from the viewpoint of ensuring good fluidity and adhesiveness of the oral composition and facilitating the manufacture of the oral composition, the moisture content is preferably 30% by weight or more. The water content is preferably 45% by weight or more, more preferably 45% by weight or more, and is usually 55% by weight or less, preferably 50% by weight or less. The water content can be adjusted by adjusting the amount of water added or by carrying out a heating treatment or drying treatment during the production stage. The water content (moisture content) of the oral composition can be measured using a heat-drying moisture meter (e.g., METT L Measurements are taken using a HB 43-S (manufactured by ER TOLEDO). The sample is placed in a designated container and heated to a temperature of 100°C. The measurement is completed when the weight change is 1 mg or less in 60 seconds, and the moisture content is calculated from the weighing values ​​before and after heating. The method for measuring the moisture content in this specification is also applicable to measuring the moisture content of objects other than oral compositions, for example, a mixture in a method for producing an oral composition, which will be described later. The content of other substances in the oral composition is not particularly limited, and the composition can be adjusted appropriately depending on the product design.

[0092] Examples of flavorings include menthol, tobacco leaf extract, natural plant flavorings (e.g., cinnamon, sage, herbs, chamomile, kudzu, sweet tea, cloves, lavender, cardamom, cloves, nutmeg, bergamot, geranium, honey essence, rose oil, lemon, orange, cinnamon bark, caraway, jasmine, ginger, coriander, vanilla extract, spearmint, peppermint, cassia, coffee, celery, cascarilla, sandalwood, cocoa, ylang-ylang, fennel, anise, licorice, St. John's bread, plum extract, peach extract, etc.), sugars (e.g., glucose, fructose, isomerized sugar, etc.), and the like. Examples of such additives include cocoa (powder, extract, etc.), esters (e.g., isoamyl acetate, linalyl acetate, isoamyl propionate, linalyl butyrate, etc.), ketones (e.g., menthone, ionone, damascenone, ethyl maltol, etc.), alcohols (e.g., geraniol, linalool, anethole, eugenol, etc.), aldehydes (e.g., vanillin, benzaldehyde, anisaldehyde, etc.), lactones (e.g., γ-undecalactone, γ-nonalactone, etc.), animal fragrances (e.g., musk, ambergris, civet, castoreum, etc.), and hydrocarbons (e.g., limonene, pinene, etc.). These substances may be used alone or in any combination of two or more in any type and ratio.

[0093] Examples of sweeteners include sugar alcohols such as xylitol, maltitol, and erythritol, as well as sweeteners such as acesulfame potassium, sucralose, and aspartame, with sugar alcohols being preferred from the viewpoint of taste regulation. These substances may be used alone or in combination of two or more of them in any type and ratio.

[0094] An example of a bitterness suppressant is soybean lecithin. Soybean lecithin is a phospholipid, and examples thereof include phosphatidylcholine, phosphatidylethanolamine, and phosphatidic acid. These substances may be used alone or in any combination of two or more types in any desired type and ratio.

[0095] Examples of whitening agents include fine silicon dioxide, titanium dioxide, calcium carbonate, etc., and fine silicon dioxide is preferred from the viewpoint of the effect on the taste of the product. These substances may be used alone or in combination of two or more types in any type and ratio.

[0096] The content of each of the above components can also be calculated from the amount of raw material charged.

[0097] The type of emulsifier is not particularly limited, and examples thereof include emulsifiers added to foods. Examples of emulsifiers include one or more selected from the group consisting of sucrose fatty acid esters, organic acid glycerin fatty acid esters, polyglycerin fatty acid esters, and lecithin. Examples of sucrose fatty acid esters include sucrose palmitate ester and sucrose stearate ester. Examples of organic acid glycerin fatty acid esters include succinic acid glycerin fatty acid ester and diacetyltartaric acid glycerin fatty acid ester. Examples of polyglycerin fatty acid esters include decaglycerin fatty acid ester. The content of the emulsifier in the oral composition may generally be 0.1% by weight or more and 10% by weight or less, and preferably 1.0% by weight or more and 5.0% by weight or less.

[0098] (pH of oral composition) The pH of the oral composition at a measurement temperature of 25°C is not particularly limited, but from the viewpoint of the influence on the taste of the product, it is usually 7.0 or more, preferably 7.5 or more, more preferably 8.0 or more, and usually 10.0 or less, preferably 9.5 or less, more preferably 9.0 or less. The pH can be adjusted by controlling the amount of pH adjuster added. In addition to the above pH values, the pH values ​​in this specification are also used at a measurement temperature of 25°C. 5 The values ​​are measured in °C. The pH of the oral composition at the measurement temperature of 25°C can be measured using a pH analyzer (e.g., HORIBA Ltd.'s LAQUA F-72 flat ISFET pH electrode) by adding 20 ml of water to 2 g of the oral composition, shaking for 10 minutes, and measuring the supernatant. The equipment is calibrated by three-point calibration using, for example, a phthalic acid pH standard solution (pH 4.01), a neutral phosphate pH standard solution (pH 6.86), and a borate pH standard solution (pH 9.18) (all from Wako Pure Chemical Industries).

[0099] (Particle size of components of oral composition when dry) The oral composition is preferably composed of a plurality of solid granules, but the size of the granules is not particularly limited. For example, it is preferable that the components of the dried oral composition satisfy the following classification conditions. The dried oral composition is preferably classified using a sieve with the following mesh sizes. From the viewpoints of a pleasant feel in the mouth when used by the user, ease of handling during production, and controlling quality variations, the composition typically passes through a sieve with 15 mm mesh sizes (<15 mm), preferably a sieve with 10 mm mesh sizes (<10 mm), more preferably a sieve with 5 mm mesh sizes (<5 mm), and even more preferably a sieve with 3.2 mm mesh sizes (<3.2 mm). For example, if the entire dried oral composition passes through a sieve with 3.2 mm mesh sizes, this indicates that the maximum particle size of the oral composition when dried is 3.2 mm or less. There is no need to set a lower limit for the particle size of the components of the oral composition when dry, but from the viewpoint of preventing leakage from the pouch, it is usually 3 μm or more. The above-mentioned dried oral composition can be obtained by drying the oral composition by keeping it at 70°C to 80°C for about 3 hours. The maximum particle size of the oral composition can be increased / decreased as appropriate by adjusting, for example, the particle size and water content of the nicotine-loaded ion exchange resin.

[0100] [Pouch] The pouch (packaging material) is not particularly limited, and any known material can be used as long as it can package the oral composition, is insoluble in water, and is permeable to liquids (water, saliva, etc.) and water-soluble components in the oral composition. Examples of pouch materials include cellulose-based nonwoven fabrics, and commercially available nonwoven fabrics may also be used. A pouch product can be produced by forming a sheet made of such a material into a bag shape, pouring the oral composition into the bag, and sealing it by means of heat sealing or the like. The basis weight of the sheet is not particularly limited, but is usually 12 gsm or more and 54 gsm or less, and preferably 24 gsm or more and 30 gsm or less. The thickness of the sheet is not particularly limited, but is usually 100 μm or more and 300 μm or less, and preferably 175 μm or more and 215 μm or less.

[0101] A water-repellent material may be applied to at least one of the inner and outer surfaces of the pouch. A water-repellent fluororesin is preferably used as the water-repellent material. Specifically, an example of this type of water-repellent fluororesin is Asahi Guard (registered trademark) manufactured by Asahi Glass Co., Ltd. Water-repellent fluororesins are used to apply packaging for foods and products containing fats and oils, such as confectioneries, dairy products, prepared foods, fast food, and pet food. Therefore, this type of water-repellent fluororesin is safe to apply to pouches placed in the oral cavity. The water-repellent material is not limited to fluororesins, and any other material with water-repellent properties, such as paraffin resin, silicone resin, or epoxy resin, may be used.

[0102] The pouch may contain any component, for example, a raw material for adjusting the scent or taste, a flavoring, an additive, a tobacco extract, a coloring, etc. The manner in which these components are contained is not particularly limited, and examples include coating the pouch surface, impregnating the pouch, or, if the pouch is made of fiber, containing the component in the fiber. Furthermore, the appearance of the pouch is not particularly limited, and it may be not only opaque but also translucent or transparent, in which case the oral composition packaged in the pouch can be seen through.

[0103] [Pouch products] There are no particular restrictions on the pouch product, as long as it comprises the oral composition and the pouch that packages the oral composition (the oral composition is enclosed in the pouch). The size and weight of the pouch product are not particularly limited, and the size of the pouch product before use may be such that the long side is 25 mm (28 mm, 35 mm, 38 mm) or more and 40 mm or less, or 28 mm or more and 38 mm or less, and the short side is 10 mm or more and 20 mm or less, or 14 mm or more and 18 mm or less. In addition, the weight of the pouch product before use may be 0.1 g or more and 2.0 g or less, or 0.3 g or more and 1.0 g or less. The weight ratio of the oral composition to the total weight of the pouch product is not particularly limited, but is usually 80% by weight or more, preferably 85% by weight or more, and more preferably 90% by weight or more, and is usually 99% by weight or less, preferably 97% by weight or less, and more preferably 95% by weight or less.

[0104] In measuring each property in this specification, the measurement sample is kept in an environment similar to the measurement environment for at least 48 hours before the measurement. Furthermore, the measurement temperature, measurement humidity, and measurement pressure are normal temperature (22±2°C), normal humidity (60±5% RH), and normal pressure (atmospheric pressure) unless otherwise specified.

[0105] <Usage of oral pouch products> The uses (modes of use) of oral pouch products are not particularly limited, but examples include oral tobacco such as chewing tobacco, snuff, and compressed tobacco, or nicotine-containing preparations known as nicotine pouches, etc. These are inserted between the lips and gums in the oral cavity to enjoy the taste and aroma. [Example]

[0106] The present invention will be explained in more detail below by showing examples, but the present invention should not be construed as being limited to the following examples.

[0107] <Experiment 1> Example 1 [Extraction process] Tobacco leaves and water were mixed in a weight ratio of 1:10, extracted at 85°C for 1 hour, and the solid content was roughly filtered through a nonwoven fabric to separate the solid and liquid, thereby obtaining an extract. [Filtration process] The extract obtained in the extraction step was filtered using a cross-flow filter (Lab Unit M10 manufactured by Alfa-Laval) under the following conditions to obtain a filtrate. Average pore size of the filter: 0.2 μm -Filtration membrane thickness: 0.1μm ·Membrane surface flow rate for average pore size of filtration membrane: 0.9 mL / min·cm 2 Extract temperature during feeding: 45℃ [Dialysis process] The filtrate obtained in the filtration step was subjected to electrodialysis using an electrodialysis device (MICRO ACILYZER S3 manufactured by ASTOM Corporation) under the following conditions to obtain a plant extract. Applied voltage: 10V (in Experiment 2 described below, a separate experiment was also conducted at 30V to confirm whether nicotine could remain). ·Filtration membrane area: 0.055m 2 Average pore size of the filter: 5,000 Da -Filtration membrane thickness: 0.2μm ·Membrane surface flow rate for average pore size of filtration membrane: 0.004 mL / min·cm 2

[0108] <Example 2> A plant extract was obtained in the same manner as in Example 1, except that the average pore size of the filtration membrane in the filtration step was changed from 0.2 μm to 5,000 Da (indicating a filtration capacity of 5,000 Da).

[0109] Example 3 A plant extract was obtained in the same manner as in Example 1, except that the average pore size of the filtration membrane in the filtration step was changed from 0.2 μm to 100,000 Da.

[0110] <Comparative Example 1> A plant extract was obtained in the same manner as in Example 1, except that the filtration step was not carried out.

[0111] <Measurement of protein residue> To assess the protein loss due to cross-flow filtration, measurements were performed using a plant extract spectrophotometer (Takara Bio SP300). Specifically, 20 μL of each of the BSA standard solution and the cross-flow filtered sample was dispensed, 1 mL of Bradford Dye Reagent was added, mixed, and allowed to react for 5 minutes at room temperature (25°C). The level of residual protein in the reacted solution was measured based on the absorbance at 595 nm (absorbance derived from BSA protein). The measurement results are shown in Table 1 and Figure 4.

[0112] <Nicotine analysis after electrodialysis> The nicotine ratio in the plant extract after electrodialysis was measured according to a method in accordance with DIN 10373 of the German Institute for Standardization. Specifically, 250 mg of plant extract was collected, 7.5 mL of 11% aqueous sodium hydroxide solution and 10 mL of hexane were added, and the mixture was shaken and extracted for 60 minutes. After extraction, the supernatant hexane phase was subjected to gas chromatography mass spectrometry (GC / MS) for samples taken before extraction and 1 hour, 2 hours, 4 hours, 6 hours, and 8 hours after extraction. The nicotine peak area ratios of the samples before and after electrodialysis were calculated and evaluated. Specifically, the nicotine ratio before extraction was set to 1 (Table 1 and Figure 1). 5 In each "0 hours" and "0 minutes" The nicotine ratios at other times were evaluated relatively. The evaluation results are shown in Table 1 and Figure 5. In Table 1, "-" indicates that no measurement was performed.

[0113] [Table 1]

[0114] From Table 1 and Figures 4 and 5, it can be seen that the methods for producing plant extracts according to Examples 1 to 3, in which cross-flow filtration was performed, can reduce the level of protein residue in the plant extract and increase the rate of nicotine reduction in the supernatant after extraction, compared to the method according to Comparative Example 1, in which cross-flow filtration was not performed. In other words, it can efficiently reduce the nicotine content in the plant extract, and ultimately can efficiently control the nicotine content in the plant extract. Furthermore, a comparison of Examples 1 to 3 revealed that the degree of protein residue decreased as the average pore size of the filtration membrane decreased in cross-flow filtration.

[0115] <Experiment 2> A plant extract was produced under the same conditions as in Example 1 of Experiment 1 above, except that the applied voltage in the dialysis step was changed from 10 V to 30 V. Using the plant extract, the residual protein level was measured and nicotine was analyzed under the same conditions as in Experiment 1 above. The analysis results are shown in Table 2. Furthermore, the nitrate ion (NO3 - The results of the evaluation are shown in Table 2 and FIG.

[0116] [Table 2]

[0117] From Table 2 and Figure 6, it can be seen that the method for producing a plant extract according to this embodiment can reduce the residual protein content and nitrate ions in the plant extract, and also increase the rate at which nicotine is reduced in the supernatant after extraction, i.e., can efficiently control the nicotine content in the plant extract. Therefore, it was found from Tables 1 and 2 and FIGS. 4 to 6 that the method for producing a plant extract according to this example can efficiently control the nicotine content in the plant extract.

[0118] As described above, the present invention can provide an oral pouch product that has excellent pH stability during storage, and a method for producing the same. [Explanation of symbols]

[0119] 10 Ba This product 11 Tobacco rod part 12 Cooling Segment 13 Filter Segments 14 Mouthpiece 15 Tip Paper V hole 20 Electrically heated devices 21 Heater element 22 Battery unit 23 Control Unit 24 skeleton 30 Electrically heated tobacco products

Claims

1. an extraction step of extracting a plant dispersion containing a plant to obtain an extract; a filtration step of filtering the extract by cross-flow filtration to obtain a filtrate; a dialysis step of electrodialyzing the filtrate, The average pore size of the filtration membrane used in the dialysis step is 1,000 Da or more and 10,000 Da or less, The plant is a tobacco plant. Method for producing plant extracts.

2. The method for producing a plant extract according to claim 1, wherein the cross-flow filtration is carried out by passing the extract through a filter having a filtration membrane with an average pore size of 0.2 μm or less.

3. 3. The method for producing a plant extract according to claim 2, wherein the average pore size of the filtration membrane is 2,000 Da or more and 100,000 Da or less.

4. In the cross-flow filtration, the membrane surface flow rate relative to the average pore size of the filtration membrane is 0.1 mL / min cm ２ Above, 10mL / min・cm ２ The method for producing a plant extract according to any one of claims 1 to 3, wherein the method is as follows:

5. The method for producing a plant extract according to any one of claims 1 to 3, wherein the applied voltage in the electrodialysis is 30 V or less.

6. The method for producing a plant extract according to any one of claims 1 to 3, wherein the plant dispersion further contains water.

7. A method for manufacturing a tobacco product having a tobacco rod wrapped in cigarette paper around which a tobacco filler is wrapped, and a mouthpiece portion, comprising: A method for producing a tobacco product comprising the steps of: adding a plant extract produced by the method for producing a plant extract according to any one of claims 1 to 3 to at least one selected from the group consisting of the tobacco filler and the cigarette paper; 1. A method for producing a tobacco product, comprising the steps of:

8. A method for producing an oral pouch product having an oral composition and a pouch for packaging the oral composition, comprising: A method for producing an oral pouch product, comprising the step of adding a plant extract produced by the method for producing a plant extract according to any one of claims 1 to 3 to the oral composition.

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