Preparation method of tobacco extract, tobacco extract and tobacco essence

Abstract

The invention provides a preparation method of a tobacco extract and refined essence, and the preparation method comprises the following steps: mixing and stirring a tobacco raw material and an ethanol solvent, standing for a certain time, and discarding the precipitate to obtain a first supernatant; carrying out heating and decompression treatment on the supernate, removing the ethanol solvent in the supernate, and collecting to obtain a first concentrated solution; adding water into the first concentrated solution, mixing and stirring, standing for a certain time, discarding a lower-layer water phase, and taking an upper-layer oil phase for later use; adding an ethanol solvent into the upper-layer oil phase, mixing, stirring, standing, cooling for a certain time, and discarding the precipitate to obtain a second supernatant; heating and decompressing the second supernatant, and removing the ethanol solvent in the second supernatant to obtain the target tobacco extract. According to the method, the tobacco extract is subjected to multi-step purification through ethyl alcohol and water, the problem that a conventional tobacco extract is prone to coking and bonding during molecular distillation is solved, further refining processing of the tobacco extract is facilitated, and the process difficulty is low.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of plant component extraction processing, in particular to a preparation method of tobacco extract, a tobacco extract and a tobacco essence. BACKGROUND

[0002] As a tobacco-derived raw material that can make up for the tobacco original aroma, tobacco extract occupies a core position in cigarette flavoring. Traditional tobacco extract is mainly prepared by extraction, which is mature and low in cost, but usually has problems such as poor sensory quality and insufficient flavoring effect, and needs to be further refined by other process technology to obtain high-quality tobacco extract.

[0003] Molecular distillation is a new liquid-liquid separation technology that realizes separation by using the difference in average free path of molecular motion. The refined processing of tobacco extract can realize the effective enrichment and extraction of key flavor substances, and this technology is increasingly concerned in the field of tobacco essence and flavor. Traditional extraction generally uses water and ethanol as solvents, but the obtained tobacco extract has complex components and is prone to coking and sticking when directly subjected to molecular distillation, which has obvious shortcomings in process. The current research generally uses organic solvents (such as petroleum ether) extraction, CO2 supercritical extraction, membrane filtration and other methods to extract tobacco in order to obtain tobacco extract suitable for molecular distillation processing. However, these methods have the following disadvantages: the organic solvents used are dangerous and only suitable for small-scale preparation in the laboratory, which greatly limits the application of molecular distillation technology; the organic solvents have odor interference and are dangerous, and cannot be directly used as flavor raw materials and must be processed to remove them; the application of supercritical extraction and membrane filtration and other new technologies is high in cost and complex in process, which will greatly increase the cost and application threshold of tobacco extract molecular distillation processing. SUMMARY

[0004] In order to solve the above problems, the present application provides a preparation method of tobacco extract, a tobacco extract and a tobacco essence. The tobacco extract obtained by the method of the present application has good performance whether it is directly used as a flavor in a cigarette or is further processed by molecular distillation to obtain a tobacco essence, and the preparation process does not use dangerous organic solvents or high-difficulty supercritical extraction process, which has advantages in safety and economy.

[0005] In order to achieve the above purpose, the present application adopts the following technical solutions:

[0006] A preparation method of tobacco extract, comprising the following steps:

[0007] (1) mixing and stirring tobacco raw materials with ethanol solvent, discarding the precipitate after standing to obtain a first supernatant;

[0008] (2) heating and reducing pressure treatment is conducted on the first supernatant to remove the ethanol solvent therein, and a first concentrated liquid is collected;

[0009] (3) water is added to the first concentrated liquid, mixed and stirred, and after standing, the lower aqueous phase is discarded, and the upper oil phase is taken for standby;

[0010] (4) ethanol solvent is added to the upper oil phase obtained in step (3), mixed and stirred, and after standing and cooling, the precipitate is discarded, and a second supernatant is obtained;

[0011] (5) heating and reducing pressure treatment is conducted on the second supernatant to remove the ethanol solvent therein, and a second concentrated liquid is collected, which is the target tobacco extract.

[0012] Further, the volume concentration of the ethanol solvent used in step (1) is 85% to 90%.

[0013] Further, the weight ratio of the tobacco raw material to the added ethanol solvent in step (1) is 1:(6 to 8).

[0014] Further, the heating temperature in step (2) is 52°C to 58°C.

[0015] Further, the volume ratio of the concentrated liquid to water in step (3) is 1:(2 to 3).

[0016] Further, the volume concentration of the ethanol solvent used in step (4) is 90% to 95%.

[0017] Further, the volume ratio of the upper oil phase to the added ethanol solvent in step (4) is 1:(4 to 5).

[0018] Further, the cooling temperature in step (4) is -5°C to 0°C, and the standing time is 18 to 24 hours.

[0019] Further, the heating temperature in step (5) is 52°C to 58°C.

[0020] Another object of the present application is to provide a refined tobacco essence, which is prepared by subjecting the tobacco extract obtained by the above preparation method to molecular distillation treatment, and collecting the light components, to obtain the refined tobacco extract.

[0021] The application scheme can achieve the following beneficial effects:

[0022] (1) The present application removes impurity components prone to charring during high-temperature processing by multi-step purification of tobacco extract, to obtain high-quality tobacco extract suitable for molecular distillation processing, solving the problem of sticking and shutdown caused by charring of tobacco extract prepared by conventional extraction method under the high-temperature and high-vacuum processing conditions of molecular distillation, and facilitating further refining and processing of tobacco extract.

[0023] (2) The present application only uses water and ethanol system, without introducing other organic solvents such as petroleum ether, has high safety, the ethanol used in the preparation process can be recycled, the process cost is low, the process conditions are mild, the operation is simple, and the present application is suitable for industrialized production and popularization and application.

[0024] (3) The tobacco extract prepared by the present application does not have the risk of residual interfering or dangerous solvents, and can be directly used as a flavoring agent in cigarettes in addition to molecular distillation refining and processing, which can meet different processing requirements and has good industrial application prospect. BRIEF DESCRIPTION OF DRAWINGS

[0025] Fig. 1 Total score data of the examples and comparative examples.

[0026] Figs. 2 to 12 The evaluation of the examples and comparative examples is single-item score data, and the items are aroma quality, aroma concentration, aroma permeability, aroma softness, aroma delicacy, aroma irritation, fresh fragrance, roasted tobacco fragrance, aftertaste residue, miscellaneous gas and aroma amount. DETAILED DESCRIPTION

[0027] The technical solutions of the present application will be described below in conjunction with the examples, obviously, the described examples are only part of the examples of the present application, not all examples. Based on the examples in the present application, all other examples obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0028] Example 1

[0029] The present embodiment provides a preparation method of tobacco extract, comprising the following steps:

[0030] (1) Tobacco raw material is weighed, crushed and then 6 times the weight of 88% ethanol is added, mixed and stirred, and after standing for 24 hours, the precipitate is discarded and the supernatant is collected for use;

[0031] (2) The supernatant obtained in the previous step is concentrated under reduced pressure at 55℃ to remove the ethanol solvent, and the concentrated solution is collected for use;

[0032] (3) to the concentrated solution obtained in the previous step, 3 times the volume of water is added, mixed and stirred, and after standing for 6 hours, the lower aqueous phase is discarded, and the upper oil phase is taken for standby;

[0033] (4) to the upper oil phase obtained in the previous step, 5 times the volume of 95% ethanol is added, mixed and stirred, and after standing for 24 hours at -5°C, the precipitate is discarded, and the supernatant is taken for standby;

[0034] (5) the supernatant obtained in the previous step is concentrated at 55°C under reduced pressure to remove the ethanol solvent, and the concentrated solution is collected as the target extract.

[0035] Example 2

[0036] The present embodiment provides a preparation method of a tobacco extract, comprising the following steps:

[0037] (1) tobacco raw materials are weighed, crushed, and then 6 times the weight of 85% ethanol is added, mixed and stirred, and after standing for 24 hours, the precipitate is discarded, and the supernatant is taken for standby;

[0038] (2) the supernatant obtained in the previous step is concentrated at 55°C under reduced pressure to remove the ethanol solvent, and the concentrated solution is collected for standby;

[0039] (3) to the concentrated solution obtained in the previous step, 3 times the volume of water is added, mixed and stirred, and after standing for 6 hours, the lower aqueous phase is discarded, and the upper oil phase is taken for standby;

[0040] (4) to the upper oil phase obtained in the previous step, 5 times the volume of 95% ethanol is added, mixed and stirred, and after standing for 24 hours at -5°C, the precipitate is discarded, and the supernatant is taken for standby;

[0041] (5) the supernatant obtained in the previous step is concentrated at 55°C under reduced pressure to remove the ethanol solvent, and the concentrated solution is collected as the target extract.

[0042] Example 3

[0043] The present embodiment provides a preparation method of a tobacco extract, comprising the following steps:

[0044] (1) tobacco raw materials are weighed, crushed, and then 6 times the weight of 90% ethanol is added, mixed and stirred, and after standing for 24 hours, the precipitate is discarded, and the supernatant is taken for standby;

[0045] (2) the supernatant obtained in the previous step is concentrated at 55°C under reduced pressure to remove the ethanol solvent, and the concentrated solution is collected for standby;

[0046] (3) to the concentrated solution obtained in the previous step, 3 times the volume of water is added, mixed and stirred, and after standing for 6 hours, the lower aqueous phase is discarded, and the upper oil phase is taken for standby;

[0047] (4) Add 5 times the volume of 95% ethanol to the upper oil phase obtained in the previous step, mix and stir, cool and stand at -5℃ for 24 hours, discard the precipitate, and take the supernatant for later use.

[0048] (5) The supernatant obtained in the previous step is concentrated under reduced pressure at 55°C to remove the ethanol solvent, and the concentrated liquid is the target extract.

[0049] Example 4

[0050] This embodiment provides a method for preparing a tobacco extract, including the following steps:

[0051] (1) Weigh the tobacco raw material, crush it, add 6 times the weight of 88% ethanol, mix and stir, let it stand for 24 hours, discard the precipitate, and take the supernatant for later use.

[0052] (2) The supernatant obtained in the previous step was concentrated under reduced pressure at 55°C to remove the ethanol solvent, and the concentrated liquid was collected for later use.

[0053] (3) Add 2.5 times the volume of water to the concentrate obtained in the previous step, mix and stir, let stand for 6 hours, discard the lower aqueous phase, and take the upper oil phase for later use;

[0054] (4) Add 4.5 times the volume of 95% ethanol to the upper oil phase obtained in the previous step, mix and stir, cool and stand at -5℃ for 24 hours, discard the precipitate, and take the supernatant for later use.

[0055] (5) The supernatant obtained in the previous step is concentrated under reduced pressure at 55°C to remove the ethanol solvent, and the concentrated liquid is the target extract.

[0056] Example 5

[0057] This embodiment provides a method for preparing a tobacco extract, including the following steps:

[0058] (1) Weigh the tobacco raw material, crush it, add 6 times the weight of 88% ethanol, mix and stir, let it stand for 24 hours, discard the precipitate, and take the supernatant for later use.

[0059] (2) The supernatant obtained in the previous step was concentrated under reduced pressure at 55°C to remove the ethanol solvent, and the concentrated liquid was collected for later use.

[0060] (3) Add 2.5 times the volume of water to the concentrate obtained in the previous step, mix and stir, let stand for 8 hours, discard the lower aqueous phase, and take the upper oil phase for later use;

[0061] (4) Add 4.5 times the volume of 90% ethanol to the upper oil phase obtained in the previous step, mix and stir, cool and stand at -5℃ for 24 hours, discard the precipitate, and take the supernatant for later use.

[0062] (5) The supernatant obtained in the previous step is concentrated under reduced pressure at 58°C to remove the ethanol solvent, and the concentrated liquid is the target extract.

[0063] Example 6

[0064] This embodiment provides a method for preparing a tobacco extract, including the following steps:

[0065] (1) Weigh the tobacco raw material, crush it, add 6 times the weight of 88% ethanol, mix and stir, let it stand for 24 hours, discard the precipitate, and take the supernatant for later use.

[0066] (2) The supernatant obtained in the previous step was concentrated under reduced pressure at 55°C to remove the ethanol solvent, and the concentrated liquid was collected for later use.

[0067] (3) Add 3 times the volume of water to the concentrate obtained in the previous step, mix and stir, let stand for 7 hours, discard the lower aqueous phase, and take the upper oil phase for later use;

[0068] (4) Add 4 times the volume of 95% ethanol to the upper oil phase obtained in the previous step, mix and stir, cool and stand at -5℃ for 24 hours, discard the precipitate, and take the supernatant for later use.

[0069] (5) The supernatant obtained in the previous step is concentrated under reduced pressure at 55°C to remove the ethanol solvent, and the concentrated liquid is the target extract.

[0070] Example 7

[0071] (1) Weigh the tobacco raw material, crush it, add 6 times the weight of 88% ethanol, mix and stir, let it stand for 24 hours, discard the precipitate, and take the supernatant for later use.

[0072] (2) The supernatant obtained in the previous step was concentrated under reduced pressure at 55°C to remove the ethanol solvent, and the concentrated liquid was collected for later use.

[0073] (3) Add twice the volume of water to the concentrate obtained in the previous step, mix and stir, let stand for 7 hours, discard the lower aqueous phase, and take the upper oil phase for later use;

[0074] (4) Add 5 times the volume of 95% ethanol to the upper oil phase obtained in the previous step, mix and stir, cool and stand at -5℃ for 24 hours, discard the precipitate, and take the supernatant for later use.

[0075] (5) The supernatant obtained in the previous step is concentrated under reduced pressure at 55°C to remove the ethanol solvent, and the concentrated liquid is the target extract.

[0076] Comparative Example 1

[0077] This comparative example provides a method for preparing a tobacco extract, comprising the following steps:

[0078] (1) Weigh the tobacco raw material, crush it, add 6 times the weight of 70% ethanol, mix and stir, let it stand for 24 hours, discard the precipitate, and take the supernatant for later use.

[0079] (2) The supernatant obtained in the previous step was concentrated under reduced pressure at 55°C to remove the ethanol solvent, and the concentrated liquid was collected for later use.

[0080] (3) Add 3 times the volume of water to the concentrate obtained in the previous step, mix and stir, let stand for 6 hours, discard the lower aqueous phase, and take the upper oil phase for later use.

[0081] (4) Add 5 times the volume of 95% ethanol to the upper oil phase obtained in the previous step, mix and stir, cool and stand at -5℃ for 24 hours, discard the precipitate, and take the supernatant for later use.

[0082] (5) The supernatant obtained in the previous step is concentrated under reduced pressure at 55°C to remove the ethanol solvent, and the concentrated liquid is the target extract.

[0083] Comparative Example 2

[0084] This embodiment provides a method for preparing a tobacco extract, including the following steps:

[0085] (1) Weigh the tobacco raw material, crush it, add 6 times the weight of 88% ethanol, mix and stir, let it stand for 24 hours, discard the precipitate, and take the supernatant for later use.

[0086] (2) The supernatant obtained in the previous step was concentrated under reduced pressure at 65°C to remove the ethanol solvent, and the concentrate was collected for later use.

[0087] (3) Add 3 times the volume of water to the concentrate obtained in the previous step, mix and stir, let stand for 6 hours, discard the lower aqueous phase, and take the upper oil phase for later use.

[0088] (4) Add 5 times the volume of 95% ethanol to the upper oil phase obtained in the previous step, mix and stir, cool and stand at -5℃ for 24 hours, discard the precipitate, and take the supernatant for later use.

[0089] (5) The supernatant obtained in the previous step is concentrated under reduced pressure at 65°C to remove the ethanol solvent, and the concentrated liquid is the target extract.

[0090] Comparative Example 3

[0091] This embodiment provides a method for preparing a tobacco extract, including the following steps:

[0092] (1) Weigh the tobacco raw material, crush it, add 6 times the weight of 88% ethanol, mix and stir, let it stand for 24 hours, discard the precipitate, and take the supernatant for later use.

[0093] (2) The supernatant obtained in the previous step was concentrated under reduced pressure at 55°C to remove the ethanol solvent, and the concentrated liquid was collected for later use.

[0094] (3) Add 5 times the volume of 95% ethanol to the upper oil phase obtained in the previous step, mix and stir, cool and stand at -5℃ for 24 hours, discard the precipitate, and take the supernatant for later use.

[0095] (4) The supernatant obtained in the previous step is concentrated under reduced pressure at 55°C to remove the ethanol solvent, and the concentrated liquid is the target extract.

[0096] Comparative Example 4

[0097] This embodiment provides a method for preparing a tobacco extract, including the following steps:

[0098] (1) Weigh the tobacco raw material, crush it, add 6 times the weight of 88% ethanol, mix and stir, let it stand for 24 hours, discard the precipitate, and take the supernatant for later use.

[0099] (2) The supernatant obtained in the previous step was concentrated under reduced pressure at 55°C to remove the ethanol solvent, and the concentrated liquid was collected for later use.

[0100] (3) Add 3 times the volume of water to the concentrate obtained in the previous step, mix and stir, let stand for 6 hours, discard the lower aqueous phase, and take the upper oil phase, which is the target extract.

[0101] Comparative Example 5

[0102] This embodiment provides a method for preparing a tobacco extract, including the following steps:

[0103] (1) Weigh the tobacco raw material, crush it, add 6 times the weight of 95% ethanol, mix and stir, let it stand for 24 hours, discard the precipitate, and take the supernatant for later use.

[0104] (2) The supernatant obtained in the previous step was concentrated under reduced pressure at 55°C to remove the ethanol solvent, and the concentrated liquid was collected for later use.

[0105] (3) Add 3 times the volume of water to the concentrate obtained in the previous step, mix and stir, let stand for 6 hours, discard the lower aqueous phase, and take the upper oil phase for later use.

[0106] (4) Add 5 times the volume of 95% ethanol to the upper oil phase obtained in the previous step, mix and stir, cool and stand at -5℃ for 24 hours, discard the precipitate, and take the supernatant for later use.

[0107] (5) The supernatant obtained in the previous step is concentrated under reduced pressure at 55°C to remove the ethanol solvent, and the concentrated liquid is the target extract.

[0108] Comparative Example 6

[0109] This embodiment provides a method for preparing a tobacco extract, including the following steps:

[0110] (1) Weigh the tobacco raw material, crush it, add 6 times the weight of 88% ethanol, mix and stir, let it stand for 24 hours, discard the precipitate, and take the supernatant for later use.

[0111] (2) The supernatant obtained in the previous step was concentrated under reduced pressure at 55°C to remove the ethanol solvent, and the concentrated liquid was collected for later use.

[0112] (3) Add 3 times the volume of water to the concentrate obtained in the previous step, mix and stir, let stand for 6 hours, discard the lower aqueous phase, and take the upper oil phase for later use.

[0113] (4) Add 5 times the volume of 95% ethanol to the upper oil phase obtained in the previous step, mix and stir, cool and stand at 5°C for 24 hours, discard the precipitate, and take the supernatant for later use.

[0114] (5) The supernatant obtained in the previous step is concentrated under reduced pressure at 55°C to remove the ethanol solvent, and the concentrated liquid is the target extract.

[0115] Comparative Example 7

[0116] This embodiment provides a method for preparing a tobacco extract, including the following steps:

[0117] (1) Weigh the tobacco raw material, crush it, add 6 times the weight of 88% ethanol, mix and stir, let it stand for 24 hours, discard the precipitate, and take the supernatant for later use.

[0118] (2) The supernatant obtained in the previous step was concentrated under reduced pressure at 55°C to remove the ethanol solvent, and the concentrated liquid was collected for later use.

[0119] (3) Add 3 times the volume of water to the concentrate obtained in the previous step, mix and stir, let stand for 6 hours, discard the lower aqueous phase, and take the upper oil phase for later use.

[0120] (4) Add 5 times the volume of 85% ethanol to the upper oil phase obtained in the previous step, mix and stir, cool and stand at -5℃ for 24 hours, discard the precipitate, and take the supernatant for later use.

[0121] (5) The supernatant obtained in the previous step is concentrated under reduced pressure at 55°C to remove the ethanol solvent, and the concentrated liquid is the target extract.

[0122] Product quality testing:

[0123] ① The tobacco extracts obtained in Examples 1-7 and Comparative Examples 1-7 were diluted to prepare flavorings for use in cigarette rolling. Sensory evaluations were conducted by tasters, with scores based on eleven indicators: aroma quality, aroma quantity, off-flavors, aroma concentration, aroma penetration, aroma smoothness, aroma delicacy, aroma irritation, aftertaste, and the aroma profiles of flue-cured and fresh tobacco. The results were recorded in [the relevant documentation]. Figs. 1~12 middle.

[0124] ② Take 300g of each of the tobacco extracts obtained in Examples 1-7 and Comparative Examples 1-7, and perform molecular distillation treatment on each. The distillation temperature is 90℃ and the pressure is 0.05mbar. Observe the molecular distillation process status, collect the light components to obtain tobacco flavoring, use the tobacco flavoring in cigarettes, and have the tasters conduct sensory evaluations on each cigarette. The results are recorded in Table 1.

[0125] Table 1. Molecular distillation processing compatibility of the examples and comparative samples

[0126]

[0127] according to Figs. 1~7 The sensory evaluation scores of the illustrated examples and comparative samples show that the sensory evaluation of the examples is generally significantly higher than that of the comparative samples, and the sensory evaluation of the examples is more stable. Therefore, the process steps and process parameters provided by the method of the present invention can reliably produce high-quality tobacco extracts.

[0128] Based on Examples 1-3, the concentration of ethanol reagent in step (1) is related to aroma quality, aroma permeability, and aroma irritation to a certain extent. When the ethanol reagent concentration is between 85% and 90%, the scores in all aspects are at a high level. However, Comparative Example 1, with a lower ethanol concentration, and Comparative Example 5, with a higher ethanol concentration, both scored lower than the Examples. Comparative Example 2 set the evaporation temperature of steps 2 and 5 to a higher 65°C, and its scores, especially aroma permeability, showed a significant decrease. Comparative Examples 3 and 4 omitted the water purification step in step 3 and the alcohol purification step in step 4, respectively, and their aroma quality scores were significantly lower than the Examples, indicating poor aroma quality. Comparative Example 6 set the cooling and settling temperature of step 4 to 5°C, and Comparative Example 7 adjusted the ethanol reagent concentration in the alcohol purification step to 85%. Both showed a certain decrease in sensory scores, exhibiting poor performance in terms of sensory smoothness and delicacy, and were also more irritating.

[0129] The above results indicate that the optimized parameters in the preparation process have a significant impact on the sensory effects of the extract and are crucial for the preservation of its aroma components. The synergistic effect of parameters in each preparation step significantly affects the final sensory quality of the extract. In the comparative example, omitting steps and modifying parameter conditions resulted in adverse phenomena such as deterioration in aroma quality, weak aroma, or increased irritation, indicating that the proposed preparation method and optimized parameters are key to the effective extraction and enrichment of aroma components. In summary, the method of this invention effectively extracts aroma substances from tobacco raw materials, resulting in a tobacco extract with high quality when used as a cigarette flavoring.

[0130] Another aspect of this invention is to provide tobacco extracts suitable for molecular distillation. Since molecular distillation requires processing under conditions of low solvent content, high temperature, and high vacuum, the requirements for raw materials in molecular distillation equipment are quite stringent. Under solvent-free and high-temperature conditions, ordinary tobacco extracts contain high levels of macromolecular substances such as sugars and pectin, making them highly prone to clumping and coking. Coking forms solid particles that firmly adhere to the evaporation wall of the equipment, significantly interfering with film formation, causing uneven film scraping, affecting scraper film formation, reducing separation capacity, and damaging the scraper surface. Furthermore, coking is extremely difficult to remove, causing significant difficulties in equipment cleaning, and in severe cases, even causing permanent damage to the evaporator.

[0131] The tobacco extracts obtained in Examples 1-7 not only exhibit high quality when used directly as cigarette flavorings, but also perform well during molecular distillation. The underlying reasons for these advantages are likely similar: the method of this invention effectively removes impurities from the tobacco extracts. These impurities affect both the taste of cigarettes during combustion and the implementation of the molecular distillation process. Comparative Examples 1, 3, and 5 suffered from severe material caking, necessitating shutdown. This is likely due to insufficient removal of large molecular impurities such as sugars and pectin, causing caking at high temperatures. Comparative Examples 4, 6, and 7 exhibited low tobacco flavoring yields and poor sensory effects, likely due to the loss of significant amounts of light aroma components during the tobacco extract preparation process. While the sample in Comparative Example 2 was suitable for molecular distillation, its sensory quality was significantly poor, which is related to… Fig. 1 The results of the sensory evaluation of the medium sample confirm that the loss of some low-boiling-point components during solvent removal may have affected the overall sensory quality, making it unsuitable as a preparation method.

[0132] In summary, this invention uses three main steps—alcohol extraction, water purification, and alcohol purification—to prepare tobacco extract. Through multi-dimensional process parameter control, the tobacco extract achieves high yield and sensory scores, and performs well in molecular distillation. This allows the tobacco extract to be used directly for blending tobacco flavorings or further refined through molecular distillation, adapting to different processing requirements and showing promising industrial application prospects.

[0133] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing a tobacco extract, characterized in that, Includes the following steps: (1) Mix the tobacco raw material with ethanol solvent, stir, let stand, discard the precipitate, and obtain the first supernatant; (2) The first supernatant was heated and subjected to reduced pressure to remove the ethanol solvent and the first concentrated liquid was collected. (3) Add water to the first concentrate, mix and stir, let stand and discard the lower aqueous phase, and take the upper oil phase for later use; (4) Add ethanol solvent to the upper oil phase obtained in step (3), mix and stir, let stand and cool, discard the precipitate, and obtain the second supernatant; (5) The second supernatant is heated and subjected to reduced pressure to remove the ethanol solvent and the second concentrate is collected, which is the target tobacco extract.

2. The method for preparing a tobacco extract according to claim 1, characterized in that: The volume concentration of the ethanol solvent used in step (1) is 85%~90%.

3. The method for preparing a tobacco extract according to claim 1, characterized in that: The heating temperature in step (2) is 52℃~58℃.

4. The method for preparing a tobacco extract according to claim 1, characterized in that: In step (3), the volume ratio of the concentrate to water is 1:(2~3).

5. The method for preparing a tobacco extract according to claim 1, characterized in that: The volume concentration of the ethanol solvent used in step (4) is 90%~95%.

6. The method for preparing a tobacco extract according to claim 5, characterized in that: In step (4), the volume ratio of the upper oil phase to the added ethanol solvent is 1:(4~5).

7. The method for preparing a tobacco extract according to claim 1, characterized in that: In step (4), the cooling temperature is -5℃ to 0℃ and the standing time is 18 to 24 hours.

8. The method for preparing a tobacco extract according to claim 1, characterized in that: The heating temperature in step (5) is 52℃~58℃.

9. A tobacco extract, characterized in that: It is prepared by the method described in any one of claims 1 to 8.

10. A tobacco flavoring, characterized in that: It is prepared by collecting light components after molecular distillation of the tobacco extract according to claim 9.

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