Method for improving sweet and fragrant flavor of low-grade tobacco extract and application thereof

Abstract

The present application relates to a method for improving the sweet and fragrant flavor of low-grade tobacco extract and its application, belonging to the field of tobacco additives. The method comprises the following steps: rehydrating low-grade tobacco to a moisture content of 25-35%, drying to a moisture content of 7-12%, and then storing before extraction. The present application rehydrates low-grade tobacco to a moisture content of 25-35%, then dries to a moisture content of 7-12% and stores, thereby improving the quality and sweet and fragrant flavor of low-grade tobacco extract, further improving the value of low-grade tobacco extract, and laying a foundation for its application as a tobacco additive.

Description

TECHNICAL FIELD

[0001] The present application relates to a method for improving the sweet and fragrant flavor of low-grade tobacco extract and its application, and belongs to the field of tobacco additives. BACKGROUND

[0002] Tobacco extract is widely used in tobacco products. According to the quality of raw materials, tobacco extract can be divided into two categories: one is the extract of high-quality tobacco as raw material, which gives the tobacco product characteristic aroma and improves the sensory quality of the tobacco product; the other is the extract of tobacco scraps, tobacco dust or low-grade tobacco with quality defects as raw material, which is difficult to be used directly in tobacco products, and can maximize its value after extraction.

[0003] Compared with high-quality tobacco, low-grade tobacco generally has higher content of biological macromolecular substances such as starch and protein, and lower content of degradation products such as reducing sugars and amino acids, and the degree of reaction related to aroma during conditioning is weaker. Therefore, low-grade tobacco generally has the quality defects and deficiencies of heavier stale gas and weaker sweet and fragrant flavor of Chinese-style cigarettes. For the extract of low-grade tobacco as raw material, although the quality can be improved to some extent by optimizing and improving the extraction technology, it is difficult to fundamentally overcome the defects and deficiencies of low-grade tobacco. SUMMARY

[0004] The purpose of the present application is to provide a method for improving the sweet and fragrant flavor of low-grade tobacco extract, which solves the problem of low-quality and weak sweet and fragrant flavor of low-grade tobacco extract in the prior art.

[0005] The second purpose of the present application is to provide an application of low-grade tobacco extract as a tobacco additive, which solves the problem of less application of low-grade tobacco extract in tobacco products to improve sweet and fragrant flavor and the problem of insufficient utilization of low-grade tobacco extract resources in the prior art.

[0006] In order to achieve the above purposes, the first technical solution of the present application is:

[0007] A method for improving the sweet and fragrant flavor of low-grade tobacco extract, comprising the following steps: rehydrating low-grade tobacco to a moisture content of 25-35%, drying to a moisture content of 7-12%, and storing before extraction.

[0008] The present application first rehydrates low-grade tobacco to a moisture content of 25-35%, then dries to a moisture content of 7-12% and stores, which improves the quality and sweet and fragrant flavor of low-grade tobacco extract, and further improves the value of low-grade tobacco extract, laying a foundation for its application in tobacco products.

[0009] In order to further improve the sweet flavor and quality of the extract, preferably, the drying is hot air drying, and the air temperature of the hot air drying is 110-140 DEG C. The hot air drying can effectively improve the sweet feeling of the low-grade tobacco extract.

[0010] Preferably, the air speed of the hot air drying is 0.5-5 m / s.

[0011] Preferably, the drying is to the moisture content of 7-8%. The drying end point of the traditional tobacco processing is about 12% of the moisture content, and the drying of the application belongs to over-drying, the tobacco material has a higher temperature and a lower moisture content, which is beneficial to the rapid promotion of the solid phase reaction, the rapid conversion of the internal components, and the substantial improvement of the quality of the extract.

[0012] Preferably, the storage is sealed storage after the tobacco is cooled, so as to obtain the extract with better quality and stronger sweet flavor.

[0013] Preferably, the storage time is more than 3 days. The low-grade tobacco extract stored for more than 3 days has a better sweet flavor.

[0014] Preferably, the storage time is 7-14 days. The quality of the tobacco extract is further improved with the time extension within 7 days, and the improvement amplitude is small after 7 days, and tends to be stable.

[0015] Further preferably, the low-grade tobacco is one or more of the cut tobacco, sheet tobacco, broken tobacco, and tobacco shred, which has unbalanced chemical components and obvious sensory defects.

[0016] Preferably, the extraction is solvent extraction, and the obtained extract liquid is concentrated to obtain the sweet flavor additive.

[0017] Preferably, the solvent for the extraction is one or more of ethanol, propylene glycol, glycerol, and water. These solvents can all extract the sweet substances of the tobacco.

[0018] Preferably, the mass fraction of the ethanol is 20-60%, and the mass fraction of the propylene glycol and glycerol is 30-60%.

[0019] In order to improve the extraction efficiency, preferably, the extraction temperature is 60-80 DEG C, and the time is 1-2 hours.

[0020] Preferably, during the extraction, the mass ratio of the tobacco to the solvent is 0.05-0.25:1; and the obtained extract is concentrated to the relative density of 1.1000-1.3000 g / ml. In this way, it is convenient to add the extract into the tobacco product subsequently.

[0021] The second technical scheme of the application is as follows:

[0022] The application of low-grade tobacco extract as a tobacco additive, wherein the low-grade tobacco extract is prepared by the method for improving the sweet flavor of low-grade tobacco extract.

[0023] The method for improving the sweet flavor of low-grade tobacco extract of the present application can improve the sweet flavor, quality and utilization value of low-grade tobacco extract, and provide a better tobacco flavor for tobacco products.

[0024] Preferably, the low-grade tobacco extract is added to tobacco in an amount of 10-300 mg / kg.

[0025] Preferably, the low-grade tobacco extract is dispersed in a solvent to prepare a solution, and then applied to tobacco in a proportion of 10-300 mg / kg.

[0026] Preferably, the tobacco is one or a combination of two or more of cut tobacco, tobacco shreds, stem shreds and tobacco sheet. DETAILED DESCRIPTION

[0027] The method for improving the sweet flavor of low-grade tobacco extract of the present application comprises the following steps: drying low-grade tobacco with a water content of 25-35% to a water content of 7-12% after water replenishment, and then cooling, storing, pulverizing, solvent extraction, solid-liquid separation, and filtering the filtrate to obtain low-grade tobacco extract.

[0028] To make the water replenishment more sufficient and uniform, preferably, the low-grade tobacco is sealed and balanced after water replenishment, and then dried.

[0029] Further preferably, the sealing and balancing time is 0.5-4 h. In this way, the water content of the tobacco can be uniform, which is convenient for subsequent operations.

[0030] The preparation method further comprises concentrating the filtrate to obtain low-grade tobacco extract. Preferably, the concentration temperature is 40-50°C. At this temperature, the filtrate can be concentrated, and the high sweet flavor characteristics can be better preserved so as not to be destroyed.

[0031] The technical solutions of the present application are further described below in combination with specific embodiments.

[0032] I. The specific implementation of the method for improving the sweet flavor of low-grade tobacco extract of the present application is as follows:

[0033] Embodiment 1

[0034] The method for improving the sweet flavor of low-grade tobacco extract of the present application comprises the following steps:

[0035] (1) Take 50 g of Henan B3F cut tobacco in 2018, replenish water to a water content of 25%, and seal and balance for 4 h;

[0036] (2) The cut tobacco after water balance is laid flat on the screen placed horizontally, and hot air with a wind speed of 5 m / s and a wind temperature of 110°C is dried from bottom to top in the direction perpendicular to the screen, and the cut tobacco is taken out when the moisture content is reduced to 8%;

[0037] (3) After natural cooling to room temperature, the cut tobacco is loaded into a self-sealing bag, sealed and stored at room temperature for 14 days, and then the cut tobacco is crushed;

[0038] (4) The crushed cut tobacco is mixed with 20% ethanol at a mass ratio of 0.1:1, and extracted at 60°C under stirring conditions for 2h, filtered, and the filtrate is concentrated to a relative density of 1.1900g / ml at 40-50°C to obtain a high sweet and fragrant tobacco extract S1.

[0039] Example 2

[0040] The method for improving the sweet and fragrant flavor of low-grade tobacco extract in this embodiment adopts the following steps:

[0041] (1) Take 50g of 2018 Shandong C4F cut tobacco, add water to a moisture content of 30%, and seal and balance for 2h;

[0042] (2) The cut tobacco after water balance is laid flat on the screen placed horizontally, and hot air with a wind speed of 2 m / s and a wind temperature of 140°C is dried from bottom to top in the direction perpendicular to the screen, and the cut tobacco is taken out when the moisture content is reduced to 7%;

[0043] (3) After natural cooling to room temperature, the cut tobacco is loaded into a self-sealing bag, sealed and stored at room temperature for 10 days, and then the cut tobacco is crushed;

[0044] (4) The crushed cut tobacco is mixed with a solvent (propylene glycol 30 parts, water 70 parts) at a mass ratio of 0.2:1, and extracted at 80°C under stirring conditions for 1h, filtered, and the filtrate is concentrated to a relative density of 1.2950g / ml at 40-50°C to obtain a high sweet and fragrant tobacco extract S2.

[0045] Example 3

[0046] The method for improving the sweet and fragrant flavor of low-grade tobacco extract in this embodiment adopts the following steps:

[0047] (1) Take 50g of 2018 Henan C4F cut tobacco, add water to a moisture content of 35%, and seal and balance for 0.5h;

[0048] (2) The cut tobacco after water balance is laid flat on the screen placed horizontally, and hot air with a wind speed of 0.5 m / s and a wind temperature of 120°C is dried from bottom to top in the direction perpendicular to the screen, and the cut tobacco is taken out when the moisture content is reduced to 7%;

[0049] (3) After being cooled to room temperature, the tobacco fragments were put into a self-sealing bag, sealed and stored at room temperature for 7 days, and then the tobacco fragments were crushed;

[0050] (4) The crushed tobacco fragments were mixed with water at a mass ratio of 0.25:1, and extracted at 60°C for 2h under stirring, and then filtered, and the filtrate was concentrated to a relative density of 1.1500g / ml at 40-50°C (the same below), thereby obtaining the high-sweet-smelling tobacco extract S3.

[0051] Secondly, the application of the low-grade tobacco extract of the present application is as follows:

[0052] Example 4

[0053] The application of the low-grade tobacco extract of the present example as a tobacco additive is as follows:

[0054] The tobacco extract obtained in Example 1 was diluted with water to prepare a 5% solution, and applied to the tobacco composition (tobacco composition prepared by mixing cut tobacco, tobacco sheet and stem according to a mass ratio of 85:10:5, and the same applies to the tobacco composition in other examples and experimental examples) at a ratio of 20, 50 and 100mg / kg.

[0055] The tobacco extract prepared in Example 2 was diluted with water to prepare a 5% solution, and applied to the tobacco composition at a ratio of 50mg / kg.

[0056] The tobacco extract obtained in Example 3 was diluted with water to prepare a 10% solution, and applied to the tobacco sheet at a ratio of 300mg / kg.

[0057] Thirdly, Comparative Examples

[0058] Comparative Example 1

[0059] The preparation method of the low-grade tobacco extract of the present comparative example is as follows: 50g of Henan B3F tobacco sheet in 2018 was crushed, and then the crushed tobacco sheet was mixed with 20% ethanol at a mass ratio of 0.1:1, and extracted at 60°C for 2h under stirring, and then the filtrate was concentrated to a relative density of 1.1908g / ml, thereby obtaining the tobacco extract R1.

[0060] Comparative Example 2

[0061] The preparation method of the low-grade tobacco extract of the present comparative example is as follows: 50g of Shandong C4F cut tobacco in 2018 was crushed, and then the crushed cut tobacco was mixed with a solvent (propylene glycol 30 parts and water 70 parts) at a mass ratio of 0.2:1, and extracted at 80°C for 1h under stirring, and then the filtrate was concentrated to a relative density of 1.2945g / ml, thereby obtaining the tobacco extract R2.

[0062] Comparative Example 3

[0063] The preparation method of the extract of low-grade tobacco in the present comparative example adopts the following steps: 50 g of threshing and redrying leaf tobacco of Henan C4F in 2018 is pulverized, and the pulverized threshing and redrying leaf tobacco is mixed with water at a mass ratio of 0.25:1, and then extracted at 60°C under stirring for 2 h. After filtration, the filtrate is concentrated to a relative density of 1.1511 g / ml, and the tobacco extract R3 is obtained.

[0064] Comparative Example 4

[0065] The present comparative example is an implementation in which the moisture content is 12% after drum drying.

[0066] The preparation method of the extract of low-grade tobacco in the present comparative example adopts the following steps:

[0067] (1) 50 g of leaf tobacco of Henan B3F in 2018 is supplemented with water to a moisture content of 25%, and then sealed and balanced for 4 h;

[0068] (2) The leaf tobacco after the water balance is placed in a laboratory drum drying equipment, and dried to a moisture content of about 12%;

[0069] (3) After natural cooling to room temperature, the leaf tobacco is loaded into a self-sealing bag, sealed and stored at room temperature for 14 d, and then pulverized;

[0070] (4) The pulverized leaf tobacco is mixed with 20% ethanol at a mass ratio of 0.1:1, and then extracted at 60°C under stirring for 2 h. After filtration, the filtrate is concentrated to a relative density of 1.1905 g / ml, and the tobacco extract R4 is obtained.

[0071] Comparative Example 5

[0072] The present comparative example is an implementation in which the moisture content is 12% after hot air drying.

[0073] The preparation method of the extract of low-grade tobacco in the present comparative example is basically the same as that in Example 1, except that:

[0074] The leaf tobacco is taken out when the moisture content in step (2) is reduced to 12%; and the relative density in step (4) is 1.1809 g / ml, and the obtained extract is the tobacco extract R5.

[0075] Comparative Example 6

[0076] The present comparative example is an implementation in which the moisture content is 8% after hot air drying, the moisture content is supplemented to 12%, and then the leaf tobacco is placed in the open air.

[0077] The preparation method of the extract of low-grade tobacco of the present comparative example is basically the same as that of Example 1, except that:

[0078] Step (3): After the cut tobacco is naturally cooled to room temperature, it is immediately rehydrated to a moisture content of 12%, and then is left open in an environment with a temperature of 22±2°C and a relative humidity of 60±5% for 14 days, and then is pulverized;

[0079] The relative density in Step (4) is 1.1903 g / ml, and the obtained extract is tobacco extract R6.

[0080] Comparative Example 7

[0081] The present comparative example is an implementation in which the cut tobacco is hot-air dried to a moisture content of 8%, and then is left open for 14 days.

[0082] The preparation method of the extract of low-grade tobacco of the present comparative example is basically the same as that of Comparative Example 6, except that:

[0083] Step (3): After the cut tobacco is left open in an environment with a temperature of 22±2°C and a relative humidity of 60±5% for 14 days, it is pulverized;

[0084] The relative density in Step (4) is 1.1905 g / ml, and the obtained extract is tobacco extract R7.

[0085] Comparative Example 8

[0086] The present comparative example is an implementation in which the cut tobacco is hot-air dried to a moisture content of 8%, and then is left sealed for 3 days.

[0087] The preparation method of the extract of low-grade tobacco of the present comparative example is basically the same as that of Example 1, except that:

[0088] Step (3): After the cut tobacco is naturally cooled to room temperature, it is immediately rehydrated to a moisture content of 12%, and then is left open in an environment with a temperature of 22±2°C and a relative humidity of 60±5% for 14 days, and then is pulverized;

[0089] The relative density in Step (4) is 1.1906 g / ml, and the obtained extract is tobacco extract R8.

[0090] Comparative Example 9

[0091] The present comparative example is an implementation in which the cut tobacco is hot-air dried to a moisture content of 8%, and then is left sealed for 7 days.

[0092] The preparation method of the extract of low-grade tobacco of the present comparative example is basically the same as that of Example 1, except that:

[0093] Step (3): After the cut tobacco is naturally cooled to room temperature, it is immediately rehydrated to a moisture content of 12%, and then is left open in an environment with a temperature of 22±2°C and a relative humidity of 60±5% for 14 days, and then is pulverized;

[0094] The relative density of the obtained extract in step (4) was 1.1906 g / ml, and the extract was tobacco extract R9.

[0095] IV. Experimental Examples

[0096] This experimental example is an evaluation of the sensory effects of the tobacco extracts obtained in Examples 1-3 and Comparative Examples 1-9.

[0097] The tobacco extracts prepared in Comparative Examples 1, 2, and 4-9 were diluted with water to prepare 5% solutions, and were applied to the tobacco composition at a ratio of 50 mg / kg.

[0098] The tobacco extract obtained in Comparative Example 3 was diluted with water to prepare a 10% solution, and was applied to the tobacco sheet at a ratio of 300 mg / kg.

[0099] The tobacco composition and the tobacco sheet obtained in Example 4 and the above were equilibrated at a temperature of 22±2℃ and a relative humidity of 60±5% for 1 week, and were then rolled into cigarettes. An evaluation team consisting of 7 evaluators with provincial evaluation qualifications evaluated the cigarettes. The evaluation method was according to the “Single Tobacco Internal Quality Test Method” in YC / T 138-1998 Tobacco and Tobacco Products Sensory Evaluation Method” and the “Sweet Fragrance Note Evaluation Method” in YC / T 497-2014 Cigarette Style Sensory Evaluation Method”. The specific results are shown in Table 1.

[0100] Table 1. Sensory effect evaluation results of tobacco extract

[0101]

[0102]

[0103] As shown in Table 1, the following can be known.

[0104] (1) The tobacco extract S1 obtained in Example 1 after pre-treatment of the tobacco sheet was significantly superior to the tobacco extract R1 of Comparative Example 1 in terms of sweet fragrance, sweet aftertaste, aftertaste, and the like, and was also superior to the tobacco extract R1 of Comparative Example 1 in terms of aroma quality, aroma amount, and offensive odor, and the like. This indicates that the pre-treatment according to steps (2) and (3) can improve the sensory evaluation and sweet fragrance note of the tobacco extract. Furthermore, within the range of the three addition amounts (20, 50, and 100 mg / kg) investigated, the improved and enhanced indicators of the pre-treated tobacco extract S1 were substantially the same.

[0105] The tobacco extract S2 obtained in Example 2 after pre-treatment of the tobacco sheet was significantly superior to the tobacco extract R2 without pre-treatment in terms of sweet fragrance, offensive odor, sweet aftertaste, and aftertaste, and the like.

[0106] The tobacco extract S3 obtained from the pre-processed cut tobacco pieces of Example 3 is significantly superior to the tobacco extract R3 obtained from the un-processed tobacco pieces in terms of sweetness, off-flavor, aftertaste, and the like.

[0107] (2) Comparing Example 4 with Example 5, it is found that R5 is superior to R4 in terms of aftertaste, especially sweetness, which indicates that, compared with the widely used drum drying in the tobacco industry, hot air drying can effectively improve the quality and sweetness of the grade tobacco.

[0108] (3) Comparing the method of Example 1 with that of Example 5, the tobacco of Example 5 is pre-processed, and the extract obtained from the tobacco of Example 5 is superior to that of Example 1 in terms of sweetness, aftertaste, residual flavor, and the like.

[0109] Comparing Example 1 with Example 5, the moisture content of the tobacco of Example 5 after hot air drying is 12%, which is higher than the moisture content of the tobacco of Example 1, which is 8%. The extract S1 obtained from the tobacco of Example 5 is superior to the extract R5 obtained from the tobacco of Example 1 in terms of aroma quality, off-flavor, aftertaste, residual flavor, and the like, which indicates that a higher processing intensity (the moisture content of the tobacco of Example 1 is reduced from 25% to 8%) during the drying of the tobacco is conducive to improving the quality of the extract obtained from the low-grade tobacco.

[0110] (4) Comparing the method of Example 1 with that of Example 6 and Example 7, the processing methods of the tobacco after hot air drying are different. Under standard storage conditions (temperature 22±2℃, relative humidity 60±5%), the equilibrium moisture content of the tobacco is about 12%, that is, the tobacco with a moisture content higher than 12% will lose water to 12%, and the tobacco with a moisture content lower than 12% will absorb water to 12%. The tobacco of Example 6 is pre-processed to a moisture content of 12% by adding water to the over-dried tobacco with a moisture content of 8%, and the moisture content of the tobacco remains 12% under standard storage conditions for 14 days. The tobacco of Example 7 is pre-processed to a moisture content of 8% by storing the over-dried tobacco under standard storage conditions for 14 days, and the tobacco will slowly and naturally absorb water until the moisture content is 12%. The tobacco of Example 1 is pre-processed to a moisture content of 8% by sealing the over-dried tobacco for 14 days, and the moisture content of the tobacco remains 8%. In short, the moisture content of the over-dried tobacco in Example 6, Example 7, and Example 1 decreases in turn during the 14-day storage period. The sensory evaluation results show that the quality of the extracts R6, R7, and S1 improves in turn in terms of aroma quality, off-flavor, and residual flavor, which indicates that storing the over-dried low-grade tobacco at a low moisture content for a period of time is conducive to improving the quality of the extract obtained from the low-grade tobacco.

[0111] (5) Comparing the method of Example 1 with that of Example 8 and Example 9, the storage time of the tobacco after drying is different, in which the tobacco of Example 8 is stored for 3 days, the tobacco of Example 9 is stored for 7 days, and the tobacco of Example 1 is stored for 14 days. With the extension of the storage time, the aroma quality, off-flavor, and residual flavor of the extract improve in turn, and the extract R9 stored for 7 days is relatively close to the extract S1 stored for 14 days, which indicates that storing the over-dried low-grade tobacco at a low moisture content for more than 7 days before extraction is conducive to obtaining a low-grade tobacco extract with better quality.

Claims

1. A method of improving the sweet flavor of a low grade tobacco extract, characterized by, The method comprises the following steps: The low-grade tobacco with a moisture content of 25-35% is dried to a moisture content of 7-8% by hot air drying at a wind temperature of 110-140 ℃, and then stored for extraction; the storage is carried out at room temperature after the tobacco is cooled and sealed; the storage time is 7-14 days; the extraction is solvent extraction, and the obtained extract is concentrated to obtain a sweet and fragrant flavor additive; the solvent is one or more of ethanol, propylene glycol, glycerol and water; the extraction temperature is 60-80 ℃, and the extraction time is 1-2 hours.

2. The method of improving the sweet flavor of a low grade tobacco extract according to claim 1, characterized by, The wind speed of the hot air drying is 0.5-5 m / s.

3. The method of improving sweet flavor of a low grade tobacco extract according to claim 1, wherein, During the extraction, the mass ratio of the tobacco to the solvent is 0.05-0.25:1; and the obtained extract is concentrated after the extraction, and the relative density of the concentrated extract is 1.1000-1.3000 g / ml.

4. Use of a low grade tobacco extract as a tobacco additive, characterized in that, The low-grade tobacco extract is obtained by the method for improving the sweet and fragrant flavor of a low-grade tobacco extract according to any one of claims 1-3.

5. Use of a low-grade tobacco extract as a tobacco additive according to claim 4, characterized in that, The addition amount in the tobacco is 10-300 mg / kg.

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