A method for preparing a modified starch-containing tobacco film, its product, and its application.

Abstract

This invention relates to a method for preparing a tobacco film containing modified starch, as well as its products and applications. The tobacco film prepared using modified starch in this invention exhibits superior film-forming properties, resulting in a uniform and dense film that effectively enhances barrier properties and storage stability. It is less susceptible to moisture damage and also maintains suitable wet strength and release rate, avoiding rapid swelling, breakage, or dissolution upon contact with saliva. Furthermore, it ensures a uniform release of tobacco flavor and exhibits better biocompatibility, overcoming the shortcomings of ordinary starch films such as poor taste, unstable performance, and poor compatibility.

Description

Technical Field

[0001] This invention belongs to the field of cigarette technology, specifically relating to a method for preparing a cigarette film containing modified starch, its product, and its application. Background Technology

[0002] With the continuous tightening of global tobacco control policies, the increasing awareness of consumer health protection, and the rapid iteration of new tobacco products, tobacco auxiliary materials that combine taste optimization, hygiene protection, flavor control, and harm reduction and efficiency enhancement have become one of the core directions of technological research and development in the tobacco industry. As a functional ultra-thin film material that adheres to cigarette filters and heated tobacco product mouthpieces, tobacco mouthpieces have the functions of loading flavor additives, adjusting the smoking experience, and optimizing aerosol release. They are widely used in various smoking products, including traditional cigarettes and heated tobacco products, and are key auxiliary materials for improving the user experience and safety of tobacco products.

[0003] Currently, various types of cigarette-grade mouthpieces are gradually being promoted in the market. Most existing mouthpieces are made from conventional base materials such as polyacrylate, achieving basic flavoring functions through simple doping with sweeteners, cooling agents, and other additives. However, existing mouthpiece technology still has many core defects in practical applications, hindering further improvements in product quality and user experience. First, the release stability of functional ingredients is poor; flavoring, cooling, and sweetening additives are prone to volatilization and precipitation during storage, resulting in ineffectiveness. Furthermore, the release of additives is too rapid in the initial puff and insufficient in the later stages, leading to an uneven taste throughout the puff, with a strong initial flavor followed by a weak finish and a flavor gap, failing to match the continuous release rhythm of tobacco aerosols.

[0004] Secondly, the film's physical and chemical properties are not well-suited to the environment. It swells and breaks quickly when exposed to water, which can easily lead to film breakage and adhesion to the oral mucosa, affecting user comfort. On the other hand, high-toughness films have the problem of delayed component release, making it difficult to balance mechanical properties and dissolution and release performance.

[0005] Finally, some oral membrane substrates have poor biocompatibility, and long-term use can easily cause slight irritation to the oral mucosa. Moreover, most modified oral membranes have complex preparation processes, uneven dispersion of additives, and high production costs, making it difficult to achieve large-scale mass production and thus failing to balance product performance, safety of use, and industrial economics.

[0006] In addition, some existing oral films suffer from uncontrollable degradation cycles, insufficient mechanical strength, and poor storage stability. They are also susceptible to moisture absorption, mold growth, and damage due to temperature and humidity, significantly shortening their shelf life. Therefore, developing a high-performance oral film for tobacco products that offers uniform and stable aroma release, excellent dry and wet mechanical properties, good biocompatibility, multifunctional synergy, simple preparation process, and compatibility with various tobacco products has become a pressing technical problem for those skilled in the art. Summary of the Invention

[0007] In view of the shortcomings of the prior art, the purpose of this invention is to provide a method for preparing a tobacco film containing modified starch, as well as its product and application.

[0008] To achieve this objective, the present invention adopts the following technical solution: In a first aspect, the present invention provides a method for preparing a tobacco film containing modified starch, the method comprising: (1) Mix starch with water to prepare a starch emulsion, then add carbonate and phosphate to carry out the reaction; (2) The reaction solution was filtered, and the precipitate was collected, dried, and ground to obtain modified cross-linked starch; (3) The modified cross-linked starch was mixed with water to obtain a modified cross-linked starch suspension, and then gelatinized. (4) The gelatinized suspension is mixed with glycerol to obtain a film-forming liquid. The film-forming liquid is placed in a mold and dried to obtain the modified starch tobacco film.

[0009] Preferably, the mass concentration of the starch emulsion in step (1) is 35-45%, for example, it can be 36%, 38%, 40%, 42% or 44%, etc.

[0010] Preferably, the starch includes any one or a combination of at least two of tapioca starch, wheat starch, corn starch, potato starch, or pea starch.

[0011] Preferably, the carbonate includes Na2CO3.

[0012] Preferably, the phosphate includes Na3P3O9.

[0013] Preferably, the mass ratio of starch, Na2CO3 and Na3P3O9 is (0.5-2):(0.1-1):(0.05-0.5).

[0014] "0.5-2" can be 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, or 1.9, etc. "0.1-1" can be 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, or 0.9, etc.; "0.05-0.5" can be 0.06, 0.07, 0.08, 0.09, 0.1, 0.2, 0.3 or 0.4, etc.

[0015] Preferably, the temperature of the reaction in step (1) is 35-45℃ (e.g., 36℃, 38℃, 40℃, 42℃ or 44℃, etc.), and the time is 1-2h (e.g., 1.1h, 1.3h, 1.5h, 1.7h or 1.9h, etc.).

[0016] Preferably, the pH during the reaction is 9-11, for example, it can be 9.5, 9.8, 10, 10.5 or 10.8.

[0017] Preferably, after the reaction is completed, the pH is adjusted to 6.5-7.5, for example, it can be 6.6, 6.8, 7.0, 7.2 or 7.4.

[0018] Preferably, the precipitate is washed before drying in step (2).

[0019] Preferably, the solvent used for washing includes distilled water, and the number of washing cycles is 2-5 times, for example, 2 times, 3 times, 4 times, or 5 times.

[0020] Preferably, the drying temperature in step (2) is 40-50℃ (e.g., 41℃, 43℃, 45℃, 47℃ or 49℃, etc.), and the time is 1-2h (e.g., 1.1h, 1.3h, 1.5h, 1.7h or 1.9h, etc.).

[0021] Preferably, the grinding is performed until the particle size is less than 100 mesh.

[0022] Preferably, the mass concentration of the modified cross-linked starch suspension in step (3) is 3-8%, for example, it can be 4%, 5%, 6% or 7%.

[0023] Preferably, the gelatinization process is carried out in a constant temperature water bath.

[0024] Preferably, the temperature of the water bath is 85-95℃, for example, it can be 86℃, 88℃, 90℃, 92℃ or 94℃, etc.

[0025] Preferably, the gelatinization time is 20-40 minutes, for example, 22 minutes, 25 minutes, 28 minutes, 30 minutes, 32 minutes, 35 minutes or 38 minutes.

[0026] Preferably, the amount of glycerol added in step (4) is 25-50% of the mass of the modified cross-linked starch, for example, it can be 30%, 35%, 40% or 45%.

[0027] Preferably, the mixing in step (4) further includes the addition of a sweetener.

[0028] Preferably, the amount of sweetener added is 15-25% of the mass of the modified cross-linked starch, for example, it can be 16%, 18%, 20%, 22% or 24%, etc.

[0029] Preferably, the sweetener includes sodium saccharin, neomethylhesperidin dihydrochalcone, or erythritol.

[0030] Preferably, the mixing in step (4) is carried out under water bath conditions; Preferably, the temperature of the water bath is 35-45℃, for example, it can be 36℃, 38℃, 40℃, 42℃ or 44℃, etc.

[0031] Preferably, the mixing time is 15-30 minutes, for example, 16 minutes, 18 minutes, 20 minutes, 22 minutes, 25 minutes, 27 minutes or 29 minutes.

[0032] In a second aspect, the present invention provides a tobacco film containing modified starch, wherein the tobacco film containing modified starch is prepared by the method described in the first aspect.

[0033] Thirdly, the present invention provides the application of a modified starch-containing tobacco film as described in the second aspect in the preparation of cigarettes.

[0034] The application of the modified starch-containing cigarette film of the present invention in cigarettes includes, but is not limited to, the following: ① The film-forming liquid is directly coated onto one side of the tipping paper base paper, and after drying and rolling, a functional coated tipping paper is formed, which is convenient for use in conventional tipping processes; ② The independently formed composite film is directly wrapped around the outside of the tipping paper of the cigarette filter, as an additional functional layer combined with the tipping paper, which can further inhibit surface microorganisms and slow-release sweetness; ③ The composite film is first wrapped around the outer surface of the filter rod, and then the tipping paper is wrapped around its outer layer, so that the functional film is located between the filter rod and the tipping paper. All three methods can be used.

[0035] All the specific point values ​​within the above range can be selected, and will not be elaborated on here.

[0036] Compared with the prior art, the present invention has the following beneficial effects: (1) In this invention, modified starch is used to prepare a cigarette mouth film, which has better film-forming properties, and the film is uniform and dense. It can effectively improve the barrier properties and storage stability of the film, and is not easily damaged by moisture. At the same time, it takes into account the appropriate wet strength and release rate, avoiding the problem of rapid swelling, damage or dissolution when exposed to saliva. It can also ensure the uniform release of tobacco aroma, and has better biocompatibility. It can improve the defects of ordinary starch film such as poor taste, unstable performance and poor adaptability.

[0037] (2) In this invention, sodium trimetaphosphate is combined with sodium carbonate to modify starch. Compared with single phosphate modification, the effect is better. Sodium trimetaphosphate can achieve moderate cross-linking of starch molecules, improve the toughness and moisture resistance of the film, and prevent swelling and damage during inhalation. Sodium carbonate can adjust the pH of the reaction system, activate starch molecules, improve the uniformity of modification, and improve the smoothness of film formation. The synergy of the two can avoid the shortcomings of single modification, make the dissolution rate of the oral film controllable, the additives more uniformly dispersed, and the modification process is mild and has no harmful residues, which is in line with the safety standards for tobacco use.

[0038] (3) In the preparation method of the present invention, glycerol is added during the modified starch film-making process. It can be used as a highly efficient green plasticizer to fill between starch molecular chains, effectively weakening the intermolecular forces, improving the defects of the modified starch substrate being brittle and prone to cracking, and significantly improving the flexibility and extensibility of the film. At the same time, glycerol can improve the flowability of starch melt, promote uniform and smooth film formation, reduce pinholes and wrinkles in the film, and can also moderately regulate the hydrophilicity, air permeability and dissolution rate of the film, improve the fit and feel of the film. It is also non-toxic, odorless, and has good compatibility, meeting the safety requirements for tobacco auxiliary materials. Detailed Implementation

[0039] To further illustrate the technical means and effects of the present invention, the following describes the technical solution of the present invention in conjunction with preferred embodiments of the present invention. However, the present invention is not limited to the scope of the embodiments.

[0040] The following detailed description of the features and advantages of the present invention is sufficient to enable those skilled in the art to understand the technical content of the present invention and implement it accordingly. Furthermore, based on this specification and the claims, those skilled in the art can easily understand the related objectives and advantages of the present invention.

[0041] The terminology and expressions used herein are for descriptive purposes only, and the invention should not be limited to these terms and expressions. The use of these terms and expressions does not imply the exclusion of any illustrative and descriptive equivalents (or parts thereof), and it should be recognized that various modifications that may exist should also be included within the scope of the claims. Other modifications, variations, and substitutions may also exist. Accordingly, the claims should be considered to cover all such equivalents.

[0042] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention in any way.

[0043] The raw materials used in the embodiments or comparative examples of this invention can be used as long as they are purchased from authorized distributors.

[0044] Example 1 This embodiment provides a tobacco film containing modified starch, and the preparation method of the tobacco film containing modified starch is as follows: (1) Weigh 10g of tapioca starch, add it to water, and prepare a 40% starch emulsion; (2) Add 3g Na2CO3 and 1g Na3P3O9 to the starch emulsion, adjust the pH to 10.0 with NaOH, react at 40℃ for 1.5 h, and adjust the pH to 7.0 with citric acid after the reaction is completed; (3) The reaction solution was filtered, the precipitate was washed three times with distilled water, dried in a constant temperature drying oven at 45℃, ground and pulverized, and passed through a 100-mesh sieve to obtain modified cross-linked starch. (4) Weigh 4 g of modified cross-linked starch, add distilled water and stir thoroughly to prepare a starch suspension with a mass concentration of 5%; (5) Stir the starch suspension in a water bath at 90°C for 30 min until the starch is completely gelatinized; then add 1.5 g of glycerol and 0.9 g of sweetener (a mixture of sodium saccharin and erythritol in a mass ratio of 1:1), and continue stirring in a water bath at 40°C for 20 min to obtain a film-forming solution. After drying the film-forming solution in a mold, the modified starch-containing tobacco film is obtained.

[0045] Example 2 This embodiment provides a tobacco film containing modified starch, and the preparation method of the tobacco film containing modified starch is as follows: (1) Weigh 10g of wheat starch, add it to water, and prepare a 45% starch emulsion; (2) Add 5g Na2CO3 and 0.5g Na3P3O9 to the starch emulsion, adjust the pH to 11 with NaOH, react at 45℃ for 1h, and adjust the pH to 6.5 with citric acid after the reaction is completed; (3) The reaction solution was filtered, the precipitate was washed four times with distilled water, dried in a constant temperature drying oven at 40℃, ground and pulverized, and passed through a 100-mesh sieve to obtain modified cross-linked starch. (4) Weigh 4g of modified cross-linked starch, add distilled water and stir thoroughly to prepare a starch suspension with a mass concentration of 8%; (5) Stir the starch suspension in a water bath at 85°C for 40 minutes until the starch is completely gelatinized; then add 2g of glycerol and 0.6g of sweetener (sodium saccharin), and continue stirring in a water bath at 45°C for 15 minutes to obtain a film-forming solution. After drying the film-forming solution in a mold, the modified starch-containing tobacco film is obtained.

[0046] Example 3 This embodiment provides a tobacco film containing modified starch, and the preparation method of the tobacco film containing modified starch is as follows: (1) Weigh 10g of pea starch, add it to water, and prepare a 35% starch emulsion; (2) Add 8g Na2CO3 and 5g Na3P3O9 to the starch emulsion, adjust the pH to 9 with NaOH, react at 35℃ for 2h, and adjust the pH to 7.5 with citric acid after the reaction is completed; (3) The reaction solution was filtered, the precipitate was washed 5 times with distilled water, dried in a constant temperature drying oven at 50℃, ground and pulverized, and passed through a 100-mesh sieve to obtain modified cross-linked starch. (4) Weigh 4g of modified cross-linked starch, add distilled water and stir thoroughly to prepare a starch suspension with a mass concentration of 3%; (5) Stir the starch suspension in a water bath at 95°C for 20 minutes until the starch is completely gelatinized; then add 1g of glycerol and 0.8g of sweetener (neomethylhesperidin dihydrochalcone), and continue stirring in a water bath at 35°C for 30 minutes to obtain a film-forming solution. After drying the film-forming solution in a mold, the modified starch-containing tobacco film is obtained.

[0047] Example 4 This embodiment provides a tobacco film containing modified starch. The only difference between this embodiment and Embodiment 1 is that the amount of Na2CO3 added in step (2) is 12g and the amount of Na3P3O9 added is 0.3g. The remaining steps and process parameters are the same as in Embodiment 1.

[0048] Example 5 This embodiment provides a tobacco film containing modified starch. The only difference between this embodiment and Embodiment 1 is that the amount of Na2CO3 added in step (2) is 0.8g and the amount of Na3P3O9 added is 6g. The remaining steps and process parameters are the same as in Embodiment 1.

[0049] Example 6 This embodiment provides a tobacco film containing modified starch. The only difference between this embodiment and Embodiment 1 is that an equal amount of Na3PO4 is used to replace Na3P3O9 in step (2). The remaining steps and process parameters are the same as in Embodiment 1.

[0050] Example 7 This embodiment provides a tobacco film containing modified starch. The only difference between this embodiment and Embodiment 1 is that an equal amount of CaCO3 is used to replace Na2CO3 in step (2). The remaining steps and process parameters are the same as in Embodiment 1.

[0051] Example 8 This embodiment provides a tobacco film containing modified starch. The only difference between this embodiment and Embodiment 1 is that the amount of glycerol added in step (5) is 3g. The remaining steps and process parameters are the same as in Embodiment 1.

[0052] Example 9 This embodiment provides a tobacco film containing modified starch. The only difference between this embodiment and Embodiment 1 is that the amount of glycerol added in step (5) is 0.8g. The remaining steps and process parameters are the same as in Embodiment 1.

[0053] Example 10 This embodiment provides a tobacco film containing modified starch, which differs from Embodiment 1 only in that no sweetener is added in step (5), while the remaining steps and process parameters are the same as in Embodiment 1.

[0054] Comparative Example 1 This comparative example provides a starch-containing tobacco film, and the preparation method of the modified starch-containing tobacco film is as follows: (1) Weigh 4g of cassava starch, add distilled water and stir thoroughly to prepare a starch suspension with a mass concentration of 5%; (2) Stir the starch suspension in a water bath at 90°C for 30 min until the starch is completely gelatinized; then add 1.5 g of glycerol, and continue stirring in a water bath at 40°C for 20 min to obtain a film-forming solution. After drying the film-forming solution in a mold, the starch-containing tobacco film is obtained.

[0055] Comparative Example 2 This comparative example provides a tobacco film containing modified starch, which differs from Example 1 only in that Na2CO3 is not added in step (2), and the reduction is made up by Na3P3O9. The remaining steps and process parameters are the same as in Example 1.

[0056] Comparative Example 3 This comparative example provides a tobacco film containing modified starch, which differs from Example 1 only in that Na3P3O9 is not added in step (2), and the reduction is made up by Na2CO3. The remaining steps and process parameters are the same as in Example 1.

[0057] Comparative Example 4 This comparative example provides a tobacco film containing modified starch. The only difference between this example and Example 1 is that in step (5), 1.5 g of glycerol is added to the starch suspension, and then the mixture is stirred for 20 min under a water bath at 40°C to obtain a film-forming liquid. The film-forming liquid is then loaded into a mold and dried to obtain the tobacco film containing modified starch. The remaining steps and process parameters are the same as in Example 1.

[0058] Comparative Example 5 This comparative example provides a tobacco film containing modified starch, which differs from Example 1 only in that glycerol is not added in step (5). The gelatinized starch suspension is loaded into a mold and dried to obtain the tobacco film containing modified starch. The remaining steps and process parameters are the same as in Example 1.

[0059] Test Example 1: Flexibility and Breathability Test The flexibility and air permeability of the tobacco films obtained in Examples 1-3 and Comparative Examples 1-5 were tested.

[0060] The flexibility was tested according to GB / T1731-1993; the air permeability was tested five times using a GTR-704R cigarette paper air permeability tester and the average value was taken. The results are shown in Table 1.

[0061] Table 1 As shown in Table 1, the tobacco film obtained by the method of the present invention not only has better flexibility, but also has excellent air permeability.

[0062] Test Example 2: Sensory Test Test cigarettes were prepared by wrapping the filter rods (outside the tipping paper) of finished cigarettes (containing no flavoring or sweetening ingredients) with the tobacco films obtained in Examples 1-10 and Comparative Examples 1-5. Control cigarettes were prepared by wrapping the filter rods of finished cigarettes (containing no flavoring or sweetening ingredients) with a mouthpiece made of acrylate resin (loaded with 0.9g of a sweetener in a 1:1 mass ratio of sodium saccharin and erythritol). Sensory quality tests were conducted on both the test and control cigarettes according to national standards.

[0063] Thirteen top-level tasters were organized to conduct sensory evaluations of the various indicators of the cigarettes obtained above, according to GB5606.4-2005 "Cigarettes Part 4: Sensory Technical Requirements". At the same time, the test cigarettes were placed in an environment of 40℃ and 75% relative humidity for one month before sensory testing was conducted again. The specific definitions of the sensory quality evaluation indicators are shown in Table 2, the scoring criteria are shown in Table 3, and the scoring results are shown in Table 4 (the average value of each group is taken and one decimal place is retained).

[0064] Table 2 Table 3 Table 4 As can be seen from Table 4, compared with conventional acrylic resin mouth film, the cigarette wrapping film obtained in Examples 1-3 of the present invention has better harmony and taste, can make the cigarette taste more stable, and will not affect the sensory experience when placed under high temperature and high pressure.

[0065] Test Example 3: Solubility Test Test subjects: Solubility tests were conducted on the tobacco films of Examples 1-10 and Comparative Examples 1-5. Test method: Cut the prepared tobacco film into 2×2 cm square samples, and place them in 10 mL of water and 10 mL of water containing... αThe solubility of amylase in artificial saliva was determined at 37 °C.

[0066] The results are shown in Table 5.

[0067] Table 5 The results showed that the tobacco films involved in this invention were all insoluble in water. Compared with the conventional starch film of Comparative Example 1, the dissolution time of the modified tobacco films in α-amylase exceeded 30 min.

[0068] As can be seen from Examples 4-7 and Comparative Examples 2-3, only by using specific amounts of Na3P3O9 and Na2CO3 to modify starch simultaneously can the dissolution time of the membrane by α-amylase be extended. As can be seen from Examples 8-9 and Comparative Example 2, glycerol is used in the film-making process, and the amount of glycerol used also affects the performance of the final film. As shown in Comparative Example 3, the membrane performance is better when the starch suspension is gelatinized.

[0069] The applicant declares that the technical solution of this invention is illustrated by the above embodiments, but this invention is not limited to the above embodiments, that is, it does not mean that this invention must rely on the above embodiments to be implemented. Those skilled in the art should understand that any improvements to this invention, equivalent substitutions of raw materials for the products of this invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of this invention.

[0070] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0071] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

Claims

1. A method for preparing a tobacco film containing modified starch, characterized in that, The preparation method includes: (1) Mix starch with water to prepare a starch emulsion, then add carbonate and phosphate to carry out the reaction; (2) The reaction solution was filtered, and the precipitate was collected, dried, and ground to obtain modified cross-linked starch; (3) The modified cross-linked starch was mixed with water to obtain a modified cross-linked starch suspension, and then gelatinized. (4) The gelatinized suspension is mixed with glycerol to obtain a film-forming liquid. The film-forming liquid is placed in a mold and dried to obtain the modified starch tobacco film.

2. The method for preparing the modified starch-containing tobacco film as described in claim 1, characterized in that, The mass concentration of the starch emulsion in step (1) is 35-45%; Preferably, the starch includes any one or a combination of at least two of tapioca starch, wheat starch, corn starch, potato starch, or pea starch.

3. The method for preparing the modified starch-containing tobacco film as described in claim 2, characterized in that, The carbonate includes Na2CO3; Preferably, the phosphate comprises Na3P3O9; Preferably, the mass ratio of starch, Na2CO3 and Na3P3O9 is (0.5-2):(0.1-1):(0.05-0.5).

4. The method for preparing the tobacco film containing modified starch as described in any one of claims 1-3, characterized in that, The reaction in step (1) is carried out at a temperature of 35-45℃ for 1-2 hours. Preferably, the pH during the reaction is 9-11; Preferably, the pH is adjusted to 6.5-7.5 after the reaction is completed.

5. The method for preparing the tobacco film containing modified starch as described in any one of claims 1-4, characterized in that, The precipitate is washed before drying, as described in step (2); Preferably, the solvent used for washing includes distilled water, and the washing is performed 2-5 times.

6. The method for preparing a tobacco film containing modified starch as described in any one of claims 1-5, characterized in that, The drying temperature in step (2) is 40-50℃, and the drying time is 1-2 hours; Preferably, the grinding is performed until the particle size is less than 100 mesh.

7. The method for preparing a tobacco film containing modified starch as described in any one of claims 1-6, characterized in that, The mass concentration of the modified cross-linked starch suspension in step (3) is 3-8%; Preferably, the gelatinization process is carried out in a constant temperature water bath; Preferably, the temperature of the water bath is 85-95℃; Preferably, the gelatinization process takes 20-40 minutes.

8. The method for preparing a tobacco film containing modified starch as described in any one of claims 1-7, characterized in that, The amount of glycerol added in step (4) is 25-50% of the mass of the modified cross-linked starch; Preferably, the mixing in step (4) further includes the addition of a sweetener; Preferably, the sweetener includes sodium saccharin, neomethylhesperidin dihydrochalcone, or erythritol; Preferably, the mixing in step (4) is carried out under water bath conditions; Preferably, the temperature of the water bath is 35-45℃; Preferably, the mixing time is 15-30 minutes.

9. A tobacco film containing modified starch, characterized in that, The modified starch-containing tobacco film is prepared by the method described in any one of claims 1-8.

10. The application of the modified starch-containing tobacco film as described in claim 9 in the preparation of cigarettes.

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