Method for reutilizing tobacco waste and tobacco flavor

Abstract

A method for reutilizing tobacco waste, comprising the following steps: step S1, in a closed reaction vessel, subjecting raw material components to a reaction at a temperature of 50-220°C for 2-24 hours to obtain a reaction product, the raw material components comprising tobacco waste; and step S2, adding an ethanol solution to the reaction product and performing ethanol precipitation treatment to obtain an ethanol-precipitated product, which is used as a tobacco flavor.

Description

Methods for recycling tobacco waste and tobacco flavorings

[0001] Cross-reference to related applications

[0002] This disclosure is based on and claims priority to Chinese Patent Application No. 202411977133.4, filed on December 26, 2024, entitled “Method for Recycling Tobacco Waste and Tobacco Flavoring”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of tobacco technology, and in particular to a method for recycling tobacco waste and tobacco flavorings. Background Technology

[0004] The production of tobacco products generates a large amount of tobacco waste, such as waste tobacco leaves, residue after tobacco extraction, and waste generated during the refining of tobacco extracts. These wastes still contain some characteristic aroma components of tobacco, but they are usually discarded directly, resulting in resource waste.

[0005] Therefore, a method for reusing tobacco waste is needed to reduce costs and increase efficiency. Summary of the Invention

[0006] In view of this, the purpose of this disclosure is to provide a method for recycling tobacco waste and a tobacco flavoring prepared by the method. The method of this disclosure enables the recycling of tobacco waste, achieving cost reduction and efficiency improvement. The tobacco flavoring prepared by this disclosure has enhanced tobacco aroma and improved aroma richness.

[0007] The first aspect of this disclosure provides a method for recycling tobacco waste, comprising the following steps:

[0008] Step S1: In a closed reaction vessel, the raw material components are reacted at a temperature of 50℃ to 220℃ for 2 to 24 hours to obtain the reaction product, wherein the raw material components include tobacco waste; and

[0009] Step S2: Add ethanol solution to the above reaction product for alcohol precipitation to obtain alcohol-precipitated product, which is used as a flavoring agent for tobacco.

[0010] In some embodiments, the alcohol precipitation temperature is -20°C to 25°C, and the alcohol precipitation time is 0.02h to 48h.

[0011] In some embodiments, the volume concentration of the ethanol solution is 70% to 95%; preferably, in the alcohol precipitation treatment, the volume ratio of the reaction product to the ethanol solution is 1:1 to 1:20.

[0012] In some embodiments, tobacco waste includes one or more of the following: waste tobacco leaves, tobacco residue after extraction, and waste generated during the refining process of tobacco extract.

[0013] In some embodiments, in step S1, the raw material component is mixed with a first solvent, wherein the first solvent is selected from one or more of ethanol, water, propylene glycol, and glycerol.

[0014] In some embodiments, the mass ratio of the raw material component to the first solvent is 1:0 to 1:3.

[0015] In some embodiments, the raw material components also include exogenous fragrance components, which include one or more of plant fragrance raw materials and monomeric fragrances.

[0016] In some embodiments, the plant fragrance ingredients include one or more of licorice, peppermint, tea, fenugreek, and kola nut;

[0017] Monomeric flavorings include one or more of ethyl maltol, maltol, citral, and menthol.

[0018] In some embodiments, the mass ratio of tobacco waste to exogenous flavoring components in the raw material components is 1:0 to 1:10.

[0019] In some embodiments, the method further includes extracting and / or concentrating the reaction product of step S1 prior to step S2.

[0020] In some embodiments, the method further includes extracting and concentrating the alcohol precipitation product from step S2 to obtain a tobacco flavoring.

[0021] This disclosure also provides a tobacco flavoring prepared using the method of the first aspect of this disclosure.

[0022] This disclosed method involves treating tobacco waste under high temperature and pressure via a hydrothermal reaction, allowing the waste to fully decompose and release characteristic aroma components. Further, an alcohol precipitation process is used to enrich the characteristic aroma components in the reaction products obtained from the hydrothermal reaction, thereby enhancing the smoky aroma and aroma richness of the prepared tobacco flavoring. This method enables the reuse of tobacco waste, enriches its characteristic aroma components, and achieves cost reduction and efficiency improvement. The tobacco flavoring prepared by this disclosure has an enhanced smoky aroma and improved aroma richness. Detailed Implementation

[0023] The technical solutions of this disclosure will be clearly and completely described below with reference to the embodiments thereof. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of the embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0024] Throughout this specification, unless otherwise specified, the terminology used herein should be understood as having the meaning commonly used in the art. Therefore, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. In the event of any conflict, this specification shall prevail.

[0025] It should be noted that, in the embodiments of this disclosure, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a method or apparatus that includes a list of elements includes not only the elements expressly described, but also other elements not expressly listed, or elements inherent to implementing the method or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other related elements in the method or apparatus that includes that element.

[0026] In existing technologies, tobacco waste such as waste tobacco leaves generated during tobacco harvesting and production, waste residue after tobacco extraction, and waste generated during the refining of tobacco extracts are usually discarded directly. However, these tobacco wastes still contain some characteristic tobacco aroma components. Therefore, it is necessary to treat these tobacco wastes to enrich these characteristic tobacco aroma components and realize the reuse of tobacco waste.

[0027] In view of this, the present disclosure provides a method for recycling tobacco waste, comprising the following steps:

[0028] Step S1: In a closed reaction vessel, the raw material components are reacted at a temperature of 50℃ to 220℃ for 2 to 24 hours to obtain the reaction product, wherein the raw material components include tobacco waste; and

[0029] Step S2: Add ethanol solution to the above reaction product for alcohol precipitation to obtain alcohol-precipitated product, which is used as a flavoring agent for tobacco.

[0030] In this disclosure, raw material components are reacted in a closed reaction vessel at a temperature of 50°C to 220°C for 2 to 24 hours. Heating in the closed reaction vessel causes the raw material components to undergo a pyrolysis reaction at high temperature, generating and releasing tobacco characteristic aroma components. The tobacco characteristic aroma components are enriched and concentrated by adding an ethanol solution to the reaction product for alcohol precipitation, thereby obtaining a tobacco flavoring. This method is simple, enables the reuse of tobacco waste, enriches the characteristic aroma components in tobacco waste, and achieves cost reduction and efficiency improvement.

[0031] Exemplarily, in step S1, the reaction temperature can be 50°C, 100°C, 120°C, 130°C, 140°C, 150°C, 160°C, 170°C, 180°C, 190°C, 200°C, 210°C, 220°C, or any value within a range of two such values. In some optional embodiments, in step S1, the reaction temperature is 100°C to 220°C, preferably 150°C to 200°C. This is more conducive to the pyrolysis of tobacco waste and the release of characteristic tobacco aroma components under high-temperature conditions. Exemplarily, in step S1, the reaction time can be 2h, 4h, 6h, 8h, 10h, 12h, 14h, 16h, 18h, 20h, 22h, 24h, or any value within a range of two such values. In some optional embodiments, in step S1, the reaction time is 2h to 4h. In this disclosure, the reaction in step S1 can be carried out using a closed reaction vessel known in the art, and there is no particular limitation thereto. Exemplarily, the reaction in step S1 can be carried out using a hydrothermal reactor, an ultrasonic reactor, an electrochemical reactor, or other types of reactors.

[0032] In some embodiments, the reaction pressure in step S1 is 0-2 MPa. Exemplarily, in step S1, the reaction pressure can be 0 MPa, 0.3 MPa, 0.5 MPa, 0.8 MPa, 1.0 MPa, 1.2 MPa, 1.5 MPa, 1.8 MPa, 2.0 MPa, or a value within a range of any two of these values.

[0033] In this disclosure, the reaction product obtained in step S1 can be directly used for the alcohol precipitation treatment in step S2. Alternatively, the reaction product can be filtered to separate the solid phase component and the liquid phase component, and then the liquid phase component can be concentrated and the concentrate can be used for the alcohol precipitation treatment in step S2.

[0034] In some embodiments, tobacco waste includes one or more of the following: waste tobacco leaves, residue after tobacco extraction, and waste generated during the refining process of tobacco extract. In this disclosure, tobacco waste can be directly subjected to the high-temperature reaction in step S1, or it can be pretreated before being subjected to the high-temperature reaction.

[0035] In some embodiments, pretreatment includes one or more operations such as drying and pulverizing tobacco waste.

[0036] In some embodiments, the alcohol precipitation temperature is -20°C to 25°C. In some embodiments, the alcohol precipitation time is 0.02 h to 48 h. By performing alcohol precipitation under the above conditions, at least some impurities in the reaction products of step S1 can be removed, such as some unwanted sugars, proteins, etc., which is beneficial to further enrich and concentrate the characteristic aroma components in the reaction products of step S1, thereby improving the smoky aroma and aroma richness of the prepared tobacco flavoring. Exemplarily, the alcohol precipitation temperature can be -20°C, -15°C, -5°C, 0°C, 4°C, 5°C, 10°C, 15°C, 20°C, 25°C, or a value between any two of these values. Optionally, the alcohol precipitation temperature can be 4°C to 25°C. By performing alcohol precipitation within the above temperature range, the volatilization of ethanol can be effectively reduced, and the efficiency of alcohol precipitation can be improved. For example, the alcohol precipitation time can be 0.02h, 0.5h, 0.8h, 0.9h, 1h, 2h, 3h, 4h, 5h, 10h, 15h, 20h, 25h, 30h, 35h, 40h, 45h, 48h, or a range of any two of these values. Optionally, the alcohol precipitation time can be from 0.5h to 3h.

[0037] In some embodiments, the volume concentration of the ethanol solution is 70% to 95%. Using an ethanol solution of this concentration can effectively enrich the characteristic aroma components of tobacco, improve the efficiency of the alcohol precipitation process, and save time and raw material costs. Exemplarily, the volume concentration of the ethanol solution can be 70%, 75%, 80%, 85%, 90%, 95%, or a value within a range of any two of these values.

[0038] "Ethanol solution" refers to a solution of ethanol in water, also known as "an aqueous solution of ethanol". "Volume concentration of ethanol solution" refers to the volume percentage of ethanol relative to the total volume of the solution.

[0039] In some embodiments, during the alcohol precipitation process, the mass ratio of the reaction product to the ethanol solution is 1:1 to 1:20. This facilitates the thorough transfer of characteristic aroma components from the reaction product to the ethanol solution, thereby achieving enrichment of the characteristic aroma components. Exemplarily, the mass ratio of the reaction product to the ethanol solution can be 1:1, 1:5, 1:10, 1:15, 1:20, or a range consisting of any two of these values. In some preferred embodiments, during the alcohol precipitation process, the volume ratio of the reaction product to the ethanol solution is 1:1 to 1:10.

[0040] In this disclosure, "alcohol precipitation" refers to a process in which a certain concentration of ethanol solution is added to the raw material. Utilizing the property that aroma components are soluble in ethanol while impurities are insoluble, the aroma components are converted to ethanol, while the impurities are precipitated. For example, the specific steps of alcohol precipitation include weighing a certain mass of raw material, adding a certain mass of ethanol solution, stirring, placing it in a desired environment for an appropriate time, and then filtering.

[0041] In some embodiments, in step S1, the raw material component is mixed with a first solvent, wherein the first solvent is selected from one or more of ethanol, water, petroleum ether, ethyl acetate, propylene glycol, and glycerol. Using the aforementioned first solvent can fully dissolve the characteristic aroma components released from tobacco waste in the raw material component, thereby achieving enrichment of the characteristic aroma components. Those skilled in the art can determine whether to add a solvent to the raw material component based on the type and state of the tobacco waste. For example, when the tobacco waste is waste generated during the tobacco extraction process, the raw material component is a liquid substance, and no additional solvent needs to be added. When the tobacco waste is a solid substance such as waste tobacco leaves or residue after tobacco extraction, a solvent is usually required to promote the full release and dissolution of the characteristic aroma components in the tobacco waste in the solvent.

[0042] In some embodiments, the mass ratio of the raw material component to the first solvent is 1:0 to 1:3. By keeping the volume ratio of the raw material component to the first solvent within the above range, it is beneficial for the first solvent to fully dissolve the characteristic aroma components in the tobacco waste, thereby improving the solubility of the characteristic aroma components in the tobacco waste.

[0043] In some embodiments, the raw material components also include exogenous flavoring components, which may be selected from one or more plant-based flavoring raw materials and monomeric flavorings. By adding exogenous flavoring components to the raw material components, it is beneficial to impart other characteristic aromas to the prepared tobacco flavorings and improve the aroma richness.

[0044] In this disclosure, "plant fragrance raw materials" refers to organic mixtures extracted from the flowers, herbs, leaves, stems, fruits, roots, bark, and other tissues of natural plants.

[0045] In this disclosure, "monomer fragrance" refers to monomer fragrance compounds that are isolated and purified from natural fragrances using physical or chemical methods.

[0046] In some embodiments, the plant flavoring ingredients include one or more of licorice extract, peppermint extract, tea extract, fenugreek extract, and kola nut extract. These plant flavoring ingredients can provide aromas that harmonize with the tobacco aroma, thus modifying the smoke. For example, fenugreek extract, when used in tobacco products, can provide nutty, roasted, caramelized, and herbal aromas, and can reduce off-flavors and irritation, correct inhalation, and enhance the tobacco flavor.

[0047] In some embodiments, the monomeric flavoring includes one or more of ethyl maltol, maltol, citral, menthol, and perillyl alcohol. These monomeric flavorings have the effect of mellowing the smoky aroma, reducing irritation, and imparting a unique flavor profile.

[0048] In some embodiments, tobacco waste is mixed with exogenous flavoring components to obtain raw material components.

[0049] In some embodiments, the mass ratio of tobacco waste to exogenous flavoring components in the raw material components is 1:0 to 1:10. Maintaining this mass ratio within the aforementioned range is beneficial for enhancing the aroma richness of the prepared tobacco flavoring. Exemplarily, the mass ratio of tobacco waste to exogenous flavoring components can be 1:0, 1:0.1, 1:0.5, 1:1, 1:3, 1:5, 1:8, 1:10, or a value within a range of any two of these values. In some preferred embodiments, the mass ratio of tobacco waste to exogenous flavoring components is 1:0.1 to 1:10.

[0050] In some embodiments, the raw material component is mixed with a second solvent to at least partially dissolve the characteristic aroma components in the raw material component. In some embodiments, the second solvent is selected from one or more of ethanol, water, petroleum ether, ethyl acetate, propylene glycol, and glycerol. In other embodiments, the raw material component is mixed with a second solvent to at least partially dissolve the characteristic aroma components in the raw material component, and then a portion of the second solvent is removed. By mixing the raw material component with a second solvent, it is beneficial to increase the dissolution rate of the characteristic aroma components in the raw material component, further improve the recovery rate of the characteristic aroma components, and enhance the smoky aroma and aroma richness of the prepared tobacco flavoring.

[0051] In this disclosure, the first solvent and the second solvent may be the same or different. It is understood that those skilled in the art can adjust the amount of the second solvent as needed, and this disclosure does not impose any specific limitations on it.

[0052] In some embodiments, the method further includes extracting and / or concentrating the reaction product of step S1 before step S2. This facilitates the extraction and separation of more aroma components, thereby increasing the content and richness of aroma components in tobacco flavorings.

[0053] In some embodiments, the method further includes a post-treatment step of the alcohol precipitation product obtained in step S2.

[0054] In some embodiments, the post-processing includes filtering the alcohol precipitation product of step S2 to separate the liquid phase component and the solid phase component, and then concentrating the liquid phase component to further increase the concentration of aroma components in the tobacco flavoring.

[0055] In some embodiments, the post-processing further includes extraction and / or concentration of the alcohol precipitation product from step S2, with the resulting product used as a tobacco flavoring. By extracting and / or concentrating the alcohol precipitation product, the concentration of aroma components in the tobacco flavoring can be further increased, thereby enhancing the smoky aroma and aroma richness of the tobacco flavoring.

[0056] In some embodiments, the extraction and / or concentration process includes redissolving the alcohol precipitation product in a third solvent, followed by extraction and / or concentration. In some embodiments, the third solvent includes one or more of ethanol, water, petroleum ether, ethyl acetate, propylene glycol, and glycerol. In this disclosure, the extraction process can be performed using extraction methods commonly used in the art. Exemplarily, extraction methods include, but are not limited to, reflux extraction, ultrasonic extraction, and percolation extraction. The concentration process can be performed using concentration methods commonly used in the art, such as vacuum distillation.

[0057] This disclosure also provides tobacco flavorings prepared according to the method of this disclosure. The tobacco flavorings provided according to this disclosure have enhanced tobacco aroma and improved aroma richness.

[0058] This disclosure also provides an aerosol generating matrix, including a tobacco flavoring prepared according to the method of this disclosure.

[0059] In this disclosure, the aerosol generating matrix refers to the material used to generate aerosols, which can be applied to fields such as cigarettes, electronic cigarettes, and heated tobacco products (HNB).

[0060] In some embodiments, the tobacco flavoring accounts for 0.01%-10% of the total mass of the aerosol-generating matrix.

[0061] The present disclosure will now be described in further detail with reference to specific embodiments. These descriptions are merely illustrative and not intended to limit the scope of the disclosure.

[0062] Example

[0063] All non-tobacco raw materials used in the following examples are commercially available.

[0064] The reactions involved in the following embodiments can all be implemented using equipment commonly used in the art.

[0065] Example 1

[0066] 20g of waste tobacco leaves from Yunyan 87 flue-cured tobacco were dried and pulverized, and then 5g of fenugreek extract, 5g of kola nut extract, and 30g of water were added (the mass ratio of raw material components to the first solvent was 1:1). The mixture was stirred evenly in a beaker to obtain a tobacco composite raw material. The tobacco composite raw material was then added to a hydrothermal reactor, placed in an oven, and heated in a sealed environment at 150°C for 4 hours to obtain a reaction product. 100g of 80% ethanol solution was added to the above reaction product (the mass ratio of raw material components to ethanol solution after reaction was 3:10), and the mixture was extracted at room temperature using an ultrasonic device for 50 minutes. The mixture obtained after ultrasonication was allowed to stand for 30 minutes and then filtered. The filtrate was concentrated to 60% of its mass to obtain tobacco flavoring.

[0067] The prepared tobacco flavoring was subjected to sensory evaluation according to the method shown below, and the sensory evaluation results are recorded in Table 1.

[0068] Sensory evaluation:

[0069] Sensory evaluation was conducted after the prepared tobacco flavoring was added to cigarettes at a mass percentage of 0.1%, and a sensory evaluation was conducted using cigarettes without added tobacco flavoring as a blank control.

[0070] Seven experts were organized to conduct sensory evaluations, referring to YC / T 496-2014 "Evaluation Method for Sensory Comfort of Cigarettes" and GB 5606.4-2005 "Cigarettes Part 4: Sensory Technical Requirements". The sensory evaluation results are shown in Table 1. The score for each sensory evaluation is the average score given by the seven experts. Among them, in terms of taste characteristics, the more comfortable the perceived sourness and sweetness, the higher the score; in terms of comfort characteristics, the better the comfort, the higher the score; the less obvious the off-flavors and irritation, the higher the score; in terms of aroma quality, the higher the aroma quantity and richness, the higher the score.

[0071] Example 2

[0072] Take 30g of the lower waste layer after alcohol precipitation of aromatic tobacco leaves, add 5g of water and 5g of propylene glycol, stir evenly in a beaker to obtain tobacco composite raw material; add the tobacco composite raw material to a hydrothermal reactor, place it in an oven, and heat it at 190℃ for 2 hours in a sealed environment to obtain the reaction product; add 300g of 90% ethanol solution to the above reaction product and extract by soaking at room temperature for 50 minutes; filter the mixture obtained after soaking, and concentrate the filtrate to obtain tobacco flavoring.

[0073] Example 3

[0074] Take 30g of the waste residue after extracting aromatic tobacco leaves, add 3g of a 10% perillol solution with 95% ethanol as the solvent and 30g of water, stir evenly in a beaker to obtain tobacco composite raw material; add the tobacco composite raw material to a hydrothermal reactor, place it in an oven, and heat it at 180℃ for 4 hours in a sealed environment to obtain the reaction product; add 300g of 70% ethanol solution to the above reaction product and stir evenly; let the obtained mixture stand at a low temperature of 4℃ for 3 hours and then filter it; concentrate the obtained filtrate to obtain tobacco flavoring.

[0075] Comparative Example 1

[0076] 20g of waste flue-cured tobacco leaves (Yun 87) were dried and pulverized, and then 5g of fenugreek extract, 5g of kola nut extract, and 30g of water were added. The mixture was stirred evenly in a beaker to obtain a tobacco blend raw material. 300g of 70% ethanol solution was added to the above tobacco blend raw material, and the mixture was heated under reflux for 3 hours. The extraction was repeated twice, and the filtrates from the two extractions were combined and concentrated to a concentration of 60% to obtain the tobacco flavoring of Comparative Example 1.

[0077] Comparative Example 2

[0078] 20g of waste flue-cured tobacco leaves (Yun 87) were dried and pulverized, and then 5g of fenugreek extract, 5g of kola nut extract, and 30g of water were added and stirred evenly in a beaker to obtain a tobacco blend raw material. The tobacco blend raw material was then added to a hydrothermal reactor, placed in an oven, and heated in a sealed environment at 150℃ for 4 hours to obtain a reaction product. The reaction product was filtered, and the filtrate was concentrated to 60% to obtain the tobacco flavoring of Comparative Example 2.

[0079] The tobacco flavorings prepared in Examples 1-3 and Comparative Examples 1-2 were subjected to sensory evaluation according to the method described above, and the results are shown in Table 1.

[0080] Table 1: Sensory Evaluation Results of Cigarettes

[0081] As can be seen from the above results, the tobacco flavoring prepared by the method of the present invention can not only realize the resource reuse of waste, but also effectively enrich the tobacco aroma, add special flavors that are in harmony with the smoke, and modify the smoke.

[0082] The above description is only a preferred embodiment of this disclosure and does not limit the patent scope of this disclosure. All equivalent structural transformations made using the contents of this specification under the inventive concept of this disclosure, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this disclosure.

Claims

1. A method for recycling tobacco waste, wherein, Includes the following steps: Step S1: In a closed reaction vessel, the raw material components are reacted at a temperature of 50°C to 220°C for 2 to 24 hours to obtain the reaction product, wherein the raw material components include tobacco waste. and Step S2: Add ethanol solution to the above reaction product for alcohol precipitation to obtain alcohol-precipitated product, which is used as a flavoring agent for tobacco.

2. The method according to claim 1, wherein, The alcohol precipitation temperature for the alcohol precipitation treatment is -20℃ to 25℃; Preferably, the alcohol precipitation time is 0.02h to 48h.

3. The method according to claim 1 or 2, wherein, The volume concentration of the ethanol solution is 70% to 95%; Preferably, in the alcohol precipitation process, the volume ratio of the reaction product to the ethanol solution is 1:1 to 1:

20.

4. The method according to claim 1 or 2, wherein, The tobacco waste includes one or more of the following: waste tobacco leaves, waste residue after tobacco extraction, and waste generated during the refining process of tobacco extract.

5. The method according to claim 1 or 2, wherein, In step S1, the raw material component is mixed with a first solvent, wherein the first solvent is selected from one or more of ethanol, water, propylene glycol, and glycerol.

6. The method according to claim 5, wherein, The mass ratio of the raw material component to the first solvent is 1:0 to 1:

3.

7. The method according to claim 1 or 2, wherein, The raw material components also include exogenous fragrance components, which include one or more of plant fragrance raw materials and monomeric fragrances; Optionally, the exogenous fragrance component includes the plant fragrance raw material, which includes one or more of licorice extract, peppermint extract, tea extract, fenugreek extract, and kola nut extract; Optionally, the exogenous fragrance component includes the monomeric fragrance, which includes one or more of ethyl maltol, maltol, citral, menthol, and perillyl alcohol.

8. The method according to claim 7, wherein, In the raw material components, the mass ratio of the tobacco waste to the exogenous flavoring components is 1:0 to 1:

10.

9. The method according to claim 1 or 2, wherein, The method further includes extracting and / or concentrating the reaction product of step S1 before step S2; Preferably, the method further includes extracting and / or concentrating the alcohol precipitation product from step S2 to obtain tobacco flavoring.

10. A tobacco flavoring prepared by any one of claims 1-9.

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