Tobacco humectant as well as preparation method and application thereof

Abstract

The invention relates to the technical field of tobacco processing, in particular to a tobacco humectant and a preparation method and application thereof. The preparation method comprises the following steps: drying and crushing apple peel to obtain apple peel powder; dispersing the apple peel powder in water, and performing ultrasonic water extraction to obtain an extracting solution; decompressing and concentrating the extracting solution to obtain a concentrated solution; adding an ethanol solution into the concentrated solution to obtain an extract alcoholic solution; standing and settling the extract alcoholic solution, and collecting the precipitate; dissolving the precipitate in water to obtain an extract aqueous solution; dialyzing the aqueous solution of the extract to obtain dialysate; and concentrating and drying the dialysate to obtain the tobacco humectant. The preparation method is simple and convenient to operate, easy to control, low in energy consumption, free of solvent residues and good in environmental friendliness; the raw materials are convenient to obtain and low in price, and waste utilization of the apple peel is achieved. The moisturizing performance of the prepared humectant is superior to that of the traditional humectant propylene glycol; the humectant is derived from natural plants, does not contain substances harmful to human bodies, and is high in use safety.

Description

Technical Field

[0001] The invention relates to the technical field of tobacco processing, in particular to a tobacco humectant and a preparation method and application thereof. Background Art

[0002] In today's tobacco industry, as consumers' awareness of health increases and their pursuit of quality of life increases, the quality and safety of tobacco products have received unprecedented attention. Among them, the moisturizing property of cigarettes, as one of the key factors affecting the smoking quality, has become an important direction in tobacco research and product development. Tobacco moisturizing property is not only related to the physical properties of cigarettes, such as burning rate and smoke humidity, but also directly affects consumers' sensory experience, including taste, aroma and irritation.

[0003] At present, commonly used tobacco humectants include propylene glycol, glycerin, sorbitol, diethylene glycol, xylitol, etc. These humectants can effectively improve the processing resistance of tobacco, but the effect of improving the sensory comfort during smoking is poor. Propylene glycol and glycerin have the widest application range, but they will enter the smoke during the combustion of cigarettes to form tar, which is harmful to the human body. With the advancement of technology and the growth of consumer demand for natural and healthy products, the industry has begun to seek safer and more environmentally friendly humectant solutions. Summary of the invention

[0004] In order to solve or partially solve the problems existing in the related art, the present invention provides a tobacco humectant and a preparation method and application thereof.

[0005] The present invention provides a method for preparing a tobacco humectant, comprising: Step a), drying and crushing the apple peel to obtain apple peel powder; Step b), dispersing the apple peel powder in water, and performing ultrasonic water extraction to obtain an extract; Step c), concentrating the extract under reduced pressure to obtain a concentrated solution; Step d), adding ethanol solution to the concentrated solution to obtain an extract alcohol solution; allowing the extract alcohol solution to settle and collecting the precipitate; Step e), dissolving the precipitate in water to obtain an aqueous extract solution; dialyzing the aqueous extract solution to obtain a dialysate; Step f), concentrating the dialysate and then drying it to obtain a tobacco humectant.

[0006] Furthermore, in the step a), the drying temperature is 60-70° C., and the drying time is 18-24 h; and the particle size of the apple peel powder is 40-60 mesh.

[0007] Furthermore, in the step b), the solid-liquid ratio of apple peel powder to water is 1:40-50; the temperature of ultrasonic water extraction is 70-80°C, the power is 300-400W, the time is 40-60min, and the supernatant is taken after centrifugation to obtain the extract.

[0008] Furthermore, step c) specifically comprises: concentrating the extract under reduced pressure to 1 / 4-1 / 5 of the original volume to obtain a concentrated solution.

[0009] Furthermore, in the step d), the volume fraction of ethanol in the extract alcohol solution is 80-90%.

[0010] Furthermore, in the step d), the sedimentation temperature is 2-5°C and the time is 18-24 hours.

[0011] Furthermore, in the step e), the content of precipitate in the aqueous extract solution is 2-4wt%; the dialysis is specifically: dialyzing in water for 24-36h using a dialysis bag with a molecular weight cutoff of 3000-4000 to obtain a dialysate.

[0012] The present invention also provides a tobacco humectant, which is prepared according to any one of the methods described above.

[0013] The present invention also provides an application of the tobacco humectant in tobacco shred production.

[0014] Furthermore, the application is specifically: The tobacco humectant is prepared into a 0.8-1.0wt% aqueous solution, and sprayed evenly on the tobacco shreds. The spraying amount of the tobacco humectant aqueous solution is 1.0-1.5wt% of the mass of the tobacco shreds.

[0015] The tobacco humectant and preparation method thereof provided by the present invention may have the following beneficial effects: 1) The humectant is made from apple peel, which contains pectin. Its hydrophilic hydroxyl group can form hydrogen bonds with water to bind the water, delaying the loss of water and improving the moisturizing performance of tobacco. The raw material of the humectant is easy to obtain and low in price, which helps to reduce the cost of raw materials; in addition, it also realizes the waste utilization of apple peel.

[0016] 2) The preparation method adopts ultrasonic water extraction combined with membrane separation technology to improve the extraction rate of pectin while reducing the content of small molecules such as monosaccharides and oligosaccharides in the humectant, so as to make the molecular weight distribution of the humectant components more reasonable, the humectant effect is better, and the taste is improved after burning. In addition, the preparation method is simple to operate, easy to control, low in energy consumption, no solvent residue, and good in environmental protection.

[0017] 3) The moisturizing performance of the prepared humectant is better than that of the traditional humectant propylene glycol. The cigarettes treated with the humectant have no odor, sufficient aroma, delicate and soft smoke, less irritation, clean aftertaste, improved dryness and strength, better sweetness, and better sensory evaluation effect than propylene glycol. In addition, the humectant is derived from natural plants, does not contain substances harmful to the human body, and is highly safe to use.

[0018] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention.

[0020] Figure 1 2 is a graph showing the change in moisture content of different tobacco samples in the embodiments of the present invention. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] The terms used in the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The singular forms "a", "the" and "the" used in the present invention and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0023] It should be understood that although the terms "first", "second", "third", etc. may be used to describe various information in the present invention, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0024] In order to improve the safety and environmental friendliness of the preservative, the inventors of the present application considered developing new preservatives from natural plants, microbial fermentation products and synthetic polymer materials, aiming to provide better moisturizing effects while reducing potential risks to health and the environment. Taking into account the problems of unstable yield in microbial fermentation and residual solvents in synthetic polymers, the inventors of the present application further considered starting with natural plant extracts. On this basis, the inventors of the present application considered using apple peel as a natural plant raw material, the main reasons for which are as follows: Apple peel is rich in hydrophilic substances such as pectin, and the hydrophilic group hydroxyl group of pectin can form hydrogen bonds with water, bind moisture, delay water loss, and improve the moisturizing properties of tobacco. In addition, waste utilization of apple peel can also be achieved.

[0025] Based on the above inventive concept, an embodiment of the present invention provides a method for preparing a tobacco humectant, which comprises: Step a), drying and crushing the apple peel to obtain apple peel powder; Step b), dispersing the apple peel powder in water, and performing ultrasonic water extraction to obtain an extract; Step c), concentrating the extract under reduced pressure to obtain a concentrated solution; Step d), adding ethanol solution to the concentrated solution to obtain an extract alcohol solution; allowing the extract alcohol solution to settle and collecting the precipitate; Step e), dissolving the precipitate in water to obtain an aqueous extract solution; dialyzing the aqueous extract solution to obtain a dialysate; Step f), concentrating the dialysate and then drying it to obtain a tobacco humectant.

[0026] The above step a) is a step of drying and crushing the apple peel into apple peel powder. The purpose of this step is to remove the moisture in the apple peel for easy storage and subsequent processing. In this step, the drying temperature is preferably 60-70°C, and the drying time is preferably 18-24 h; the particle size of the apple peel powder is preferably 40-60 mesh, more preferably 40-50 mesh, that is, the apple peel after separation is passed through a 40-50 mesh sieve to obtain apple peel powder. The apple peel used in this application is preferably selected from the apple peel of apples produced in Shandong.

[0027] The inventors of this application found that the pectin content of apple peel was relatively low during the extraction process, which seriously restricted the effect of the moisturizer: In order to solve the above problems, the inventors of the present application adopt the above steps b) to d) specifically: The above step b) is a step of ultrasonic water extraction of apple peel powder. The purpose of ultrasonic water extraction is to dissolve the pectin component of apple peel. The hydrophilic group hydroxyl group of pectin can form hydrogen bonds with water to bind the water, delay the loss of water, and improve the moisturizing performance of tobacco. In order to improve the extraction rate of pectin, the present application utilizes the cavitation effect of ultrasound to improve the extraction efficiency of pectin. It is also easy to operate and has low energy consumption. In this step, the solid-liquid ratio of apple peel powder to water is preferably 1:40-50; the temperature of ultrasonic water extraction is preferably 70-80°C, the power is preferably 300-400W, and the time is preferably 40-60min. After centrifugation, the supernatant is taken to obtain the extract.

[0028] Then, the extract is concentrated under reduced pressure according to step c) to obtain a concentrated solution. The reduced pressure concentration is used to remove water from the extract and increase the concentration of pectin. This step is preferably: the extract is concentrated under reduced pressure to 1 / 4-1 / 5 of the original volume to obtain a concentrated solution.

[0029] Step d) is a step of alcohol precipitation of the concentrated solution, by adding ethanol solution, using the difference in affinity between ethanol and water, the pectin macromolecular components are precipitated from the solution. The ethanol solution can be a 95% ethanol solution or anhydrous ethanol. In this step, the volume fraction of ethanol in the extract alcohol solution is preferably 80-90%. The sedimentation temperature is preferably 2-5°C, more preferably 4°C, and the time is preferably 18-24h. After sedimentation, centrifugation is performed to collect the precipitate. The centrifugal speed is preferably 3000-6000rpm, and the time is 10-30h. More preferably, the centrifugal speed is 4000rpm, and the time is 20min.

[0030] The inventors of the present application have found that the following problems exist when using the precipitate as a humectant: there is an odor in the cigarette smoke and the taste is not good; the humectant has poor stability and is not easy to preserve or has a high preservation cost. The inventors of the present application have further studied and found that the reason for the above problems is that while ultrasonic water extraction increases the pectin extraction rate, it also makes the dissolution rate of other components such as monosaccharides, oligosaccharides, and pigments in the apple peel higher; among them, small molecules such as monosaccharides and oligosaccharides have high water solubility on the one hand, and will be lost quickly with the evaporation of water, thereby reducing the moisturizing effect of the humectant; on the other hand, odor will be generated during the combustion process, affecting the aroma of the cigarette, and finally making it easy to deteriorate during storage and use, affecting the stability of the humectant; pigments will affect the appearance and taste of cigarettes and reduce the quality of the product. In order to solve the above problems, the present invention needs to further separate the precipitate, retain effective ingredients such as pectin, and remove impurity components such as monosaccharides, oligosaccharides, and pigments. The specific separation method uses membrane separation technology: on the one hand, membrane separation technology can be carried out under mild conditions, avoiding the damage of high temperature, high pressure and other conditions to the target product, thereby improving the separation efficiency. On the other hand, membrane separation technology does not require the use of organic solvents, avoiding the safety and environmental protection problems caused by solvent residues.

[0031] The above step e) is a step of separating the precipitate by using membrane separation technology. Specifically, the precipitate is first dissolved in water to obtain an aqueous extract solution; then the aqueous extract solution is dialyzed to obtain a dialysate. Dialysis is used to remove small molecules such as monosaccharides and oligosaccharides, so that the molecular weight distribution of the wetting agent component is more reasonable, the moisturizing effect is better, and the taste is improved after burning. In this step, the content of precipitate in the aqueous extract solution is preferably 2-4wt%; the dialysis is specifically: using a dialysis bag with a molecular weight cutoff of 3000-4000 to dialyze in water for 24-36h to obtain a dialysate. The molecular weight cutoff of the dialysis bag is more preferably 3500-4000.

[0032] In order to further improve the stability of the humectant and make it easy to store, after dialysis, the humectant is concentrated and dried according to step f) to finally obtain the tobacco humectant. The concentration is preferably carried out under reduced pressure. The drying temperature is preferably 60-80°C and the drying time is 3-4h.

[0033] Another embodiment of the present invention further provides a tobacco humectant, which is prepared according to the method described in the above embodiment.

[0034] It can be seen from the above content that the tobacco humectant and the preparation method thereof provided by the embodiments of the present invention have the following advantages: 1) The humectant is made from apple peel, which contains pectin. Its hydrophilic hydroxyl group can form hydrogen bonds with water to bind the water, delaying the loss of water and improving the moisturizing performance of tobacco. The raw material of the humectant is easy to obtain and low in price, which helps to reduce the cost of raw materials; in addition, it also realizes the waste utilization of apple peel.

[0035] 2) The preparation method adopts ultrasonic water extraction combined with membrane separation technology to improve the extraction rate of pectin while reducing the content of small molecules such as monosaccharides and oligosaccharides in the humectant, so as to make the molecular weight distribution of the humectant components more reasonable, the humectant effect is better, and the taste is improved after burning. In addition, the preparation method is simple to operate, easy to control, low in energy consumption, no solvent residue, and good in environmental protection.

[0036] 3) The moisturizing performance of the prepared humectant is better than that of the traditional humectant propylene glycol. The cigarettes treated with the humectant have no odor, sufficient aroma, delicate and soft smoke, less irritation, clean aftertaste, improved dryness and strength, better sweetness, and better sensory evaluation effect than propylene glycol. In addition, the humectant is derived from natural plants, does not contain substances harmful to the human body, and is highly safe to use.

[0037] Another embodiment of the present invention further provides an application of the above tobacco humectant in tobacco shred production. Specifically, it can be: The tobacco humectant is prepared into a 0.8-1.0wt% aqueous solution and evenly sprayed on the tobacco shreds, and the spraying amount of the tobacco humectant aqueous solution is 1.0-1.5wt% of the tobacco shreds. The use of the tobacco humectant can not only improve the processing resistance of the tobacco shreds, reduce the breakage rate of the tobacco shreds, but also improve the humidification performance of the finished cigarettes and improve the smoking comfort of the cigarettes.

[0038] The technical solution of the present invention is further described below in conjunction with specific embodiments. The apple peels in the following embodiments are from apples produced in Shandong.

[0039] Example 1 The apple peel was dried in an oven at 60 °C for 20 hours, crushed and passed through a 40-mesh sieve, 5 g of dried apple peel powder was weighed, 200 mL of water was added, and the extract was extracted at 70 °C and 300 W ultrasonic conditions for 60 minutes, centrifuged at 4000 rpm for 20 minutes, and the supernatant was taken to obtain the extract. The extract was concentrated under reduced pressure to 1 / 4 of the original volume, and a certain volume of 95% ethanol solution was added to the concentrate, so that the volume fraction of ethanol in the extract alcohol solution finally reached 80%, and the extract was allowed to stand at 4 °C for 24 hours, centrifuged at 4000 rpm for 20 minutes, and the precipitate was collected; the precipitate was dissolved in water to obtain a 4% aqueous extract solution, which was dialyzed in water for 28 hours using a dialysis bag with a molecular weight cutoff of 4000, and the dialyzate was concentrated and dried to obtain a tobacco humectant derived from apple peel.

[0040] The prepared tobacco humectant was prepared into a 1.0% extract aqueous solution, and sprayed evenly on the tobacco shreds, with the amount of the humectant being 1.5% of the tobacco shreds mass, to obtain tobacco shred sample 1. The tobacco shreds were used to prepare cigarette samples, to obtain cigarette sample 1.

[0041] Example 2 The apple peel was dried in an oven at 70 °C for 20 hours, crushed and passed through a 50-mesh sieve, 8 g of dried apple peel powder was weighed, 400 mL of water was added, and the mixture was extracted at 80 °C and 350 W ultrasonic conditions for 40 minutes, centrifuged at 4000 rpm for 20 minutes, and the supernatant was taken to obtain an extract. The extract was concentrated under reduced pressure to 1 / 4 of the original volume, a certain volume of 95% ethanol solution was added to the concentrate, and the volume fraction of ethanol in the extract alcohol solution finally reached 80%, and the mixture was allowed to stand at 4 °C for 30 hours, centrifuged at 4000 rpm for 20 minutes, and the precipitate was collected; the precipitate was dissolved in water to obtain a 4% aqueous extract solution, which was dialyzed in water for 36 hours using a dialysis bag with a molecular weight cutoff of 3500, and the dialyzate was concentrated and dried to obtain a tobacco humectant derived from apple peel.

[0042] The prepared tobacco humectant was prepared into a 0.8% aqueous extract solution, and sprayed evenly on the tobacco shreds, with the amount of the humectant being 1.0% of the tobacco shreds mass, to obtain tobacco shred sample 2. The tobacco shreds were used to prepare cigarette samples, to obtain cigarette sample 2.

[0043] Example 3 The apple peel was dried in an oven at 60 °C for 20 hours, crushed and passed through a 50-mesh sieve, 5 g of dried apple peel powder was weighed, 250 mL of water was added, and the mixture was extracted at 70 °C and 400 W ultrasonic conditions for 50 minutes, centrifuged at 4000 rpm for 20 minutes, and the supernatant was taken to obtain the extract. The extract was concentrated under reduced pressure to 1 / 5 of the original volume, a certain volume of 95% ethanol solution was added to the concentrate, and the volume fraction of ethanol in the extract alcohol solution finally reached 85%, and the mixture was allowed to stand at 4 °C for 30 hours, centrifuged at 4000 rpm for 20 minutes, and the precipitate was collected; the precipitate was dissolved in water to obtain a 2% aqueous extract solution, which was dialyzed in water for 36 hours using a dialysis bag with a molecular weight cutoff of 3500, and the dialyzate was concentrated and dried to obtain a tobacco humectant derived from apple peel.

[0044] The prepared tobacco humectant was prepared into a 1.0% extract aqueous solution, and sprayed evenly on the tobacco shreds, with the amount of the humectant being 1.2% of the tobacco shreds mass, to obtain tobacco shred sample 3. The tobacco shreds were used to prepare cigarette samples, to obtain cigarette sample 3.

[0045] The physical moisturizing ability of tobacco samples 1, 2 and 3 prepared in the embodiment was compared with propylene glycol, a preservative mainly used in the tobacco industry in the prior art (tobacco sample 4) and no preservative added (tobacco sample 5). The evaluation method is as follows: The evaluation results are listed in Table 1.

[0046]

Determination method of tobacco moisture retention performance

[0047] Take 100 g of balanced tobacco per portion, and use a laryngeal sprayer to evenly add 10 mL of 0.1 g / mL enzymatic hydrolyzed guar gum solutions of different molecular weights to the tobacco, so that the final amount of enzymatic hydrolyzed guar gum of different molecular weights is 2% of the tobacco mass, and add an equal volume of distilled water as a control. The treated tobacco is placed in a 40°C oven for drying for 2 h, and then placed in a constant temperature and humidity chamber (22°C, RH=60%) for 48 h. The moisture content of the tobacco at this time is determined according to "YCT 31-1996 Preparation and moisture determination of tobacco and tobacco products samples oven method".

[0048] Weigh each tobacco sample accurately, take 3 portions, each portion weighing 20 g, and place them in a constant temperature and humidity chamber at 22°C and RH=40%. Weigh them at 2, 4, 6, 8, 10, 24 and 48 hours, measure the change of moisture content over time, and calculate the instantaneous moisture content of tobacco by differential method. The moisture content calculation formula is as follows: W (%)= × 100 Where: W—moisture content of the sample, %; m0—weight of weighing dish, g; m1—total mass of the weighing dish and the sample before drying, g; m2—Total mass of the weighing dish and the sample after drying, g.

[0049] Table 1 Changes in moisture content of different tobacco samples during dehumidification (%)

[0050] As shown in Table 1, during the dehumidification process of tobacco, the moisture loss of tobacco added with the example sample and propylene glycol is slower than that of tobacco without humectant, indicating that all four humectants have moisturizing properties, among which the moisturizing property of the example sample is better than that of the traditional humectant propylene glycol.

[0051] The cigarette samples 1, 2 and 3 prepared in the example were compared with propylene glycol (cigarette sample 4) and no humectant added (cigarette sample 5) by smoking evaluation. The evaluation method is as follows. The results are shown in Table 2.

[0052]

Sensory evaluation of cigarettes

[0053] Table 2 Sensory evaluation results of different cigarettes

[0054] As can be seen from Table 2, the aroma and taste characteristics of the humectant treated cigarette samples are significantly better than those of the untreated cigarette samples. The humectant treated cigarettes of the embodiment have no odor, sufficient aroma, delicate and soft smoke, less irritation, clean aftertaste, improved dryness and strength, and better sweetness. The sensory evaluation effect is better than that of propylene glycol.

[0055] Embodiment 4-7 On the basis of Example 1, in the step of "adding a certain volume of 95% ethanol solution to the concentrate," the amount of 95% ethanol solution added was adjusted so that the volume fraction of ethanol in the extract alcohol solution finally reached 50% (Example 4), 60% (Example 5), 70% (Example 6) and 90% (Example 7), and the remaining steps were the same.

[0056] Comparative Example 1 Based on Example 1, in the step of "adding a certain volume of 95% ethanol solution to the concentrated solution," the 95% ethanol solution is replaced with an equal volume of water.

[0057] The tobacco humectants prepared in Examples 4-7 and Comparative Example 1 were prepared into 1.0% extract aqueous solution, and sprayed evenly on the tobacco shreds. The amount of humectant used was 1.2% of the mass of the tobacco shreds to obtain tobacco shreds samples. The tobacco shreds samples corresponding to Examples 4-7 and Comparative Example 1 were recorded as follows: Example 1 - 80% ethanol Example 4 - 50% ethanol Example 5 - 60% ethanol Example 6 - 70% ethanol Example 7 - 90% ethanol Comparative Example 1 - Water The above-mentioned "Method for Determining Moisture Retention Performance of Tobacco" was used to examine the moisturizing effect of the humectants prepared in Example 1, Examples 4-7 and Comparative Example 1 in tobacco. Figure 1 , Figure 1 The figure is the change of moisture content of different tobacco samples. Figure 1 It can be seen that the samples precipitated with different concentrations of ethanol all have moisturizing properties, among which the samples precipitated with 80% and 90% ethanol have the best moisturizing properties. The proportion of low molecular weight pectin substances in the samples precipitated with 80% and 90% ethanol is relatively high, which may be because the low molecular weight pectin substances contain a large number of hydrophilic groups, hydroxyl groups, which can form hydrogen bonds with water to bind water, delay the loss of water, and improve the physical moisturizing properties of tobacco.

[0058] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A method for preparing a tobacco humectant, characterized in that: include: Step a), drying and crushing the apple peel to obtain apple peel powder; Step b), dispersing the apple peel powder in water, and performing ultrasonic water extraction to obtain an extract; Step c), concentrating the extract under reduced pressure to obtain a concentrated solution; Step d), adding ethanol solution to the concentrated solution to obtain an extract alcohol solution; allowing the extract alcohol solution to settle and collecting the precipitate; Step e), dissolving the precipitate in water to obtain an aqueous extract solution; dialyzing the aqueous extract solution to obtain a dialysate; Step f), concentrating the dialysate and then drying it to obtain a tobacco humectant.

2. The preparation method according to claim 1, characterized in that In the step a), the drying temperature is 60-70° C. and the drying time is 18-24 h; and the particle size of the apple peel powder is 40-60 meshes.

3. The preparation method according to claim 1, characterized in that: In the step b), the solid-liquid ratio of apple peel powder to water is 1:40-50; the temperature of ultrasonic water extraction is 70-80°C, the power is 300-400W, the time is 40-60min, and the supernatant is taken after centrifugation to obtain the extract.

4. The preparation method according to claim 1, characterized in that: Step c) specifically comprises: concentrating the extract under reduced pressure to 1 / 4-1 / 5 of the original volume to obtain a concentrated solution.

5. The preparation method according to claim 1, characterized in that: In the step d), the volume fraction of ethanol in the extract alcohol solution is 80-90%.

6. The preparation method according to claim 1, characterized in that: In the step d), the sedimentation temperature is 2-5°C and the time is 18-24 hours.

7. The preparation method according to claim 1, characterized in that: In the step e), the content of precipitate in the aqueous extract solution is 2-4wt%; the dialysis is specifically: dialyzing in water for 24-36h using a dialysis bag with a molecular weight cutoff of 3000-4000 to obtain a dialysate.

8. A tobacco humectant, characterized in that: It is prepared according to the method according to any one of claims 1 to 7.

9. Use of the tobacco humectant according to claim 8 in tobacco shred production.

10. The use according to claim 9, characterized in that: The application is specifically: The tobacco humectant is prepared into a 0.8-1.0wt% aqueous solution, and is evenly sprayed on the tobacco shreds. The spraying amount of the tobacco humectant aqueous solution is 1.0-1.5wt% of the mass of the tobacco shreds.

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