A method for producing a low tar cigarette containing an extract of eaglewood

Abstract

This invention relates to the field of tobacco preparation technology, specifically to a method for preparing low-tar cigarettes containing agarwood extract. The method includes a composite filter and added tobacco shreds. The added tobacco shreds are composed of the following raw materials: 100 parts of base tobacco shreds, 0.6-1.0 parts of modified agarwood slow-release microcapsules, and 0.9-1.2 parts of a ternary composite solution. By adding modified agarwood slow-release microcapsules, the invention ensures uniform mixing of the base tobacco shreds and the microcapsules, achieving a stable and sustained release of agarwood aroma throughout the smoking process, ensuring that every puff of smoke contains the aroma of agarwood. The addition of the ternary composite solution to the base tobacco shreds makes combustion more complete and gentle, and prevents premature decomposition of the modified agarwood slow-release microcapsules within the base tobacco shreds, reducing tar and CO production during combustion. The composite filter allows the low-tar cigarette containing agarwood extract to reduce tar while retaining the aroma of agarwood during smoking.

Description

Technical Field

[0001] This invention relates to the field of tobacco preparation technology, and more specifically, to a method for preparing low-tar cigarettes containing agarwood extract. Background Technology

[0002] Low-tar cigarettes are cigarette products that reduce the release of harmful substances such as tar and nicotine in smoke by improving filter structure, increasing ventilation and dilution, optimizing tobacco formula, and using special processes. The core goal is to reduce the potential health hazards of smoking while satisfying the need to enjoy cigarettes. Low-tar cigarettes are mainly aimed at smokers who want to reduce the harm of smoking. As a transitional choice to traditional high-tar cigarettes, their taste tends to be mild and mellow, with a moderate amount of smoke. They retain the original flavor of tobacco while reducing throat irritation, making them suitable for long-term smokers to gradually adjust their smoking habits.

[0003] Existing low-tar cigarettes containing agarwood extract involve directly adding the extract to the tobacco during manufacturing. This allows the tobacco to release an agarwood aroma during combustion. The cigarette filter typically relies on a traditional cellulose acetate filter to trap tar, achieving a low-tar effect. However, directly adding liquid agarwood extract to the tobacco is volatile and not heat-resistant, causing the agarwood aroma to quickly fade after a brief initial appearance, making it impossible to achieve a uniform and stable agarwood aroma throughout the entire combustion process. This results in an inconsistent smoking experience. Furthermore, existing low-tar formulations lead to incomplete combustion of the tobacco, potentially indirectly producing more harmful substances. Using a traditional cellulose acetate filter, while trapping tar, also captures a large number of agarwood aroma molecules, making it difficult to simultaneously reduce tar and preserve aroma, resulting in a significant loss of the agarwood aroma and flavor. To address these issues, this application proposes a method for preparing low-tar cigarettes containing agarwood extract. Summary of the Invention

[0004] The purpose of this invention is to provide a method for preparing low-tar cigarettes containing agarwood extract. The low-tar cigarettes containing agarwood extract prepared by this invention achieve a stable and lasting release of agarwood aroma, ensuring that each puff of smoke contains agarwood aroma, reducing tar while improving smoke humidity and combustion uniformity, thus enhancing the effect of reducing tar and harm, while retaining the aroma of agarwood when inhaled.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A low-tar cigarette containing agarwood extract includes a composite filter and added tobacco shreds, the added tobacco shreds being composed of the following raw materials: 100 parts of base tobacco shreds, 0.6-1.0 parts of modified agarwood sustained-release microcapsules, and 0.9-1.2 parts of a ternary composite solution; The preparation steps for the low-tar cigarette containing agarwood extract are as follows: S1. Mix and stir the agarwood ethanol solution and β-cyclodextrin solution at a specific temperature to encapsulate the agarwood extract into the cavity structure of β-cyclodextrin, forming a basic inclusion complex; S2. Chitosan acetate solution was added to the basic inclusion complex, and a cross-linking reaction was carried out using glutaraldehyde to form a dense sustained-release film on the surface of the basic inclusion complex. The mixture after the reaction was filtered and washed, and then freeze-dried under vacuum to obtain powdered modified agarwood sustained-release microcapsules. S3. Dissolve trehalose, tripotassium citrate and glycerol in deionized water in proportion to prepare a ternary composite solution; S4. The modified agarwood slow-release microcapsules are mixed with the base tobacco shreds, and the ternary composite solution is sprayed evenly onto the base tobacco shreds in proportion to obtain tobacco shreds containing agarwood extract; S5. Natural bentonite was modified with hexadecyltrimethylammonium bromide to enhance its adsorption capacity for polar harmful substances, thus obtaining organic bentonite; S6. Mesoporous silica was grafted with 3-aminopropyltriethoxysilane to carry amino groups on its surface, thereby enhancing its adsorption capacity for nicotine and obtaining amino-functionalized mesoporous silica. S7. The prepared organic bentonite and amino-functionalized mesoporous silica are physically mixed in a mass ratio to obtain a composite adsorbent. This composite adsorbent is added to the cellulose acetate filter rod in a proportion to make a composite filter tip. S8. The tobacco shreds are rolled into cigarettes, attached to a composite filter, and sealed in packaging to obtain low-tar cigarettes containing agarwood extract.

[0006] Further, the preparation steps of the modified agarwood sustained-release microcapsules are as follows: Viscous agarwood extract and anhydrous ethanol are gently stirred in a water bath at 40-45℃ to fully dissolve, obtaining a free-flowing agarwood ethanol solution. This reduces the viscosity of the agarwood extract, facilitating mixing with β-cyclodextrin. β-cyclodextrin is added to deionized water at 60℃ and stirred at 500 rpm until completely dissolved, forming a clear β-cyclodextrin solution. Under constant temperature of 60℃ and high-speed shear at 1000 rpm, the agarwood ethanol solution is slowly added dropwise to the β-cyclodextrin solution over a period of 20-30 minutes. The mixture is then transferred to a constant temperature magnetic stirrer and reacted continuously at 60℃ for 4 hours at 300 rpm, allowing the agarwood ethanol solution to fully enter the hydrophobic cavities of the β-cyclodextrin solution to form a basic inclusion complex. Chitosan powder is then slowly added at 1%... In a glacial acetic acid solution, the chitosan was stirred at room temperature for 4 hours until completely dissolved to obtain a chitosan colloidal solution. The basic inclusion complex was cooled to room temperature, and the chitosan colloidal solution was uniformly added to the basic inclusion complex in the form of a spray while stirring at a low speed of 200 rpm. Glutaraldehyde solution was slowly added dropwise, and the cross-linking reaction was carried out at 40°C for 2 hours. Under the action of the cross-linking agent, a dense semi-permeable membrane was formed on the surface of the basic inclusion complex by the chitosan colloidal solution. The chitosan colloidal solution after the reaction was completed was filtered, and a mixed washing solution made of deionized water and ethanol was used to wash the basic inclusion complex 3 times to remove unreacted cross-linking agent and other solvent impurities on the surface of the basic inclusion complex. The basic inclusion complex was placed in a vacuum freeze dryer, pre-frozen at -40°C for 4 hours, and then freeze-dried at -50°C and 10 Pa vacuum for 24 hours to obtain white to slightly yellow modified agarwood sustained-release microcapsules.

[0007] Furthermore, the mass ratio of the agarwood extract to anhydrous ethanol is 1:1.5, the mass ratio of the β-cyclodextrin to deionized water is 1:15, and the mass ratio of the agarwood ethanol solution to the β-cyclodextrin solution is 1:4.

[0008] Furthermore, the mass ratio of chitosan powder to 1% glacial acetic acid solution is 1:50, the mass ratio of chitosan colloidal solution to basic inclusion complex is 5:1, the glutaraldehyde solution is 0.5% of the total volume of chitosan colloidal solution, the mass ratio of deionized water to ethanol in the mixed washing solution is 7:3, and the amount of the mixed washing solution is three times that of the basic inclusion complex.

[0009] Furthermore, the preparation steps of the ternary composite solution are as follows: In a mixing tank equipped with a stirring and heating jacket, about 80% of deionized water is added first, heated to 50°C, trehalose and tripotassium citrate are added, and the mixture is stirred at 200 rpm until completely dissolved. Heating is then stopped, and when the temperature drops below 40°C, glycerol and the remaining deionized water are added. Stirring is continued for 30 minutes to obtain a clear, homogeneous ternary composite solution without precipitate.

[0010] Furthermore, the mass ratio of trehalose, tripotassium citrate, glycerol, and deionized water is 4.5:1.5:1:93.

[0011] Further, the preparation steps of the composite filter are as follows: Bentonite is dispersed in deionized water at 60°C and stirred at high speed for 1 hour to allow it to fully expand, obtaining a bentonite suspension. Hexadecyltrimethylammonium bromide is dissolved in a small amount of hot water at 60°C and slowly added to the bentonite suspension under vigorous stirring. The mixture is reacted in a constant temperature water bath at 75°C for 6 hours to allow the cations of hexadecyltrimethylammonium bromide to exchange with the sodium ions of bentonite. After the reaction, the mixture is repeatedly centrifuged and washed until no pale yellow silver bromide precipitate is produced when tested with silver nitrate solution, obtaining modified crude bentonite. The modified crude bentonite is dried at 105°C and ground through a 200-mesh sieve to obtain organo-modified bentonite. Mesoporous silica is vacuum dried at 120°C for 4 hours to thoroughly dry the silica. To remove moisture from the pores of mesoporous silica, the dried mesoporous silica is dispersed in anhydrous toluene under nitrogen protection. 3-Aminopropyltriethoxysilane is slowly added dropwise in a specific ratio, and the mixture is refluxed and stirred at 80°C for 12 hours to allow the dried mesoporous silica to react. After the reaction is complete, the mesoporous silica is alternately filtered and washed three times with anhydrous toluene and ethanol to remove the adsorbed silane. It is then vacuum dried at 80°C for 6 hours to obtain amino-functionalized mesoporous silica. The amino-functionalized mesoporous silica and organo-functionalized bentonite powder are added to a three-dimensional mixer in a specific ratio and mixed for 30 minutes until homogeneous to obtain a composite adsorbent. This composite adsorbent is then uniformly added to a cellulose acetate filter rod along with triacetin using a filter tip forming machine to create a composite filter tip.

[0012] Furthermore, the mass ratio of bentonite, hexadecyltrimethylammonium bromide, and deionized water is 1:0.4:20; the mass ratio of hexadecyltrimethylammonium bromide to hot water at 60°C is 1:10; the mass ratio of mesoporous silica to 3-aminopropyltriethoxysilane is 1:0.8; the anhydrous toluene is 20 times the mass of mesoporous silica; and the mass ratio of anhydrous toluene to ethanol is 1:1.

[0013] Furthermore, the mass ratio of the amino-functionalized mesoporous silica to the organo-functionalized bentonite is 2.5:1 to 3:1, the cellulose acetate filter rod is a standard cellulose acetate filter rod with a single length of 120 mm, a weight of 6.5 g, and a circumference of 24 mm, the ratio of the cellulose acetate filter rod to the composite adsorbent is 66.7:1, and the triacetin is 8% of the weight of the cellulose acetate filter rod.

[0014] Furthermore, the ternary composite solution comprises 0.9% to 1.2% of the mass of the base tobacco, the modified agarwood slow-release microcapsules comprise 0.6% to 1.0% of the mass of the base tobacco, and the mass ratio of the composite filter tip to the added tobacco is 1:1.5 to 1.8.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention utilizes modified agarwood sustained-release microcapsules. By encapsulating and coating agarwood extract with β-cyclodextrin and chitosan, modified agarwood sustained-release microcapsules with sustained-release function are obtained. This successfully solves the defects of volatility and uneven release of agarwood furan and sesquiterpenes in the aroma of agarwood, achieving a stable and sustained release of aroma throughout the entire smoking process. This ensures that the cigarette has a uniform agarwood aroma from beginning to end, improving the continuity of the smoking experience and the duration of agarwood retention. Furthermore, the modified agarwood sustained-release microcapsules are more stable under the influence of light, heat, and oxygen, extending the shelf life of cigarettes.

[0016] 2. This invention utilizes a ternary composite solution, scientifically combining trehalose, tripotassium citrate, and glycerin to obtain a ternary composite solution that combines moisturizing and combustion-aiding functions. This addresses the common problems of dry taste and incomplete combustion in cigarettes. The catalytic effect of tripotassium citrate ensures more complete combustion of tobacco, directly reducing tar and CO produced by incomplete combustion. Trehalose polysaccharides have excellent water-retention properties, maintaining suitable humidity for the base tobacco and modified agarwood slow-release microcapsules, preventing premature decomposition of the modified agarwood slow-release microcapsules during storage, resulting in a gentler combustion process and a more stable release of aroma. The ternary composite solution also reduces impurities during combustion, making the smoke cleaner and highlighting the natural aroma of agarwood. This achieves improved smoke moisture and optimized combustion uniformity, ensuring a smooth and comfortable experience while reducing tar.

[0017] 3. This invention utilizes a composite filter tip, combining organic bentonite with amino-functionalized mesoporous silica, to obtain a composite filter tip with a synergistic adsorption effect. This optimizes the inherent defect of traditional filters in retaining a large amount of aroma when reducing tar and harm, improves the adsorption effect on harmful substances such as tar and nicotine, and at the same time preserves the precious agarwood aroma to the greatest extent, successfully solving the problem of difficulty in achieving both tar reduction and aroma preservation in low-tar cigarettes. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] It should be noted that the raw materials used in the following embodiments are all commercially available.

[0020] Example 1: A low-tar cigarette containing agarwood extract, comprising a composite filter and added tobacco shreds, the added tobacco shreds being composed of the following raw materials: 100 parts of base tobacco shreds, 0.6 parts of modified agarwood slow-release microcapsules, and 0.9 parts of ternary composite solution; The specific preparation steps for low-tar cigarettes containing agarwood extract are as follows: S1. Mix and stir the agarwood ethanol solution and β-cyclodextrin solution at a specific temperature to encapsulate the agarwood extract into the cavity structure of β-cyclodextrin, forming a basic inclusion complex; S2. Chitosan acetate solution was added to the basic inclusion complex, and a cross-linking reaction was carried out using glutaraldehyde to form a dense sustained-release film on the surface of the basic inclusion complex. The mixture after the reaction was filtered and washed, and then freeze-dried under vacuum to obtain powdered modified agarwood sustained-release microcapsules. S3. Dissolve trehalose, tripotassium citrate and glycerol in deionized water in proportion to prepare a ternary composite solution; S4. The modified agarwood slow-release microcapsules are mixed with the base tobacco shreds, and the ternary composite solution is sprayed evenly onto the base tobacco shreds in proportion to obtain tobacco shreds containing agarwood extract; S5. Natural bentonite was modified with hexadecyltrimethylammonium bromide to enhance its adsorption capacity for polar harmful substances, thus obtaining organic bentonite; S6. Mesoporous silica was grafted with 3-aminopropyltriethoxysilane to carry amino groups on its surface, thereby enhancing its adsorption capacity for nicotine and obtaining amino-functionalized mesoporous silica. S7. The prepared organic bentonite and amino-functionalized mesoporous silica are physically mixed in a mass ratio to obtain a composite adsorbent. This composite adsorbent is added to the cellulose acetate filter rod in a proportion to make a composite filter tip. S8. The tobacco shreds are rolled into cigarettes, attached to a composite filter, and sealed in packaging to obtain low-tar cigarettes containing agarwood extract.

[0021] The preparation steps of modified agarwood sustained-release microcapsules are as follows: Agarwood extract is obtained from dried agarwood using solvent extraction. The viscous agarwood extract is gently stirred with anhydrous ethanol in a 40-45℃ water bath until fully dissolved, resulting in a free-flowing agarwood ethanol solution. This reduces the viscosity of the agarwood extract, facilitating mixing with β-cyclodextrin. β-cyclodextrin is added to deionized water at 60℃ and stirred at 500 rpm until completely dissolved, forming a clear β-cyclodextrin solution. Under constant temperature of 60℃ and high-speed shear at 1000 rpm, the agarwood ethanol solution is slowly added dropwise to the β-cyclodextrin solution over 20-30 minutes. The mixture is then transferred to a constant temperature magnetic stirrer and reacted continuously at 300 rpm at 60℃ for 4 hours, allowing the agarwood ethanol solution to fully enter the hydrophobic cavities of the β-cyclodextrin solution, forming a basic inclusion complex. Chitosan powder is then added... A 1% glacial acetic acid solution was slowly added to the chitosan and stirred at room temperature for 4 hours until completely dissolved, yielding a chitosan colloidal solution. The basic inclusion complex was cooled to room temperature, and the chitosan colloidal solution was uniformly added to the basic inclusion complex in the form of a spray while stirring at a low speed of 200 rpm. Glutaraldehyde solution was slowly added dropwise, and the cross-linking reaction was carried out at 40°C for 2 hours. Under the action of the cross-linking agent, a dense semi-permeable membrane was formed on the surface of the basic inclusion complex. The chitosan colloidal solution after the reaction was completed was filtered, and a mixed washing solution made of deionized water and ethanol was used to wash the basic inclusion complex 3 times to remove unreacted cross-linking agent and other solvent impurities on the surface of the basic inclusion complex. The basic inclusion complex was placed in a vacuum freeze dryer, pre-frozen at -40°C for 4 hours, and then freeze-dried at -50°C and 10 Pa vacuum for 24 hours to obtain white to slightly yellow modified agarwood sustained-release microcapsules.

[0022] The mass ratio of agarwood extract to anhydrous ethanol was 1:1.5, the mass ratio of β-cyclodextrin to deionized water was 1:15, and the mass ratio of agarwood ethanol solution to β-cyclodextrin solution was 1:4.

[0023] The mass ratio of chitosan powder to 1% glacial acetic acid solution is 1:50, the mass ratio of chitosan colloidal solution to basic inclusion complex is 5:1, the glutaraldehyde solution is 0.5% of the total volume of chitosan colloidal solution, the mass ratio of deionized water to ethanol in the mixed washing solution is 7:3, and the amount of mixed washing solution used is three times that of basic inclusion complex.

[0024] The preparation steps of the ternary composite solution are as follows: In a mixing tank equipped with a stirring and heating jacket, add about 80% deionized water, heat to 50°C, add trehalose and tripotassium citrate, stir at 200 rpm until completely dissolved, stop heating, and when the temperature drops below 40°C, add glycerol and the remaining deionized water, continue stirring for 30 minutes to obtain a clear, homogeneous ternary composite solution without precipitate.

[0025] The mass ratio of trehalose, tripotassium citrate, glycerol, and deionized water is 4.5:1.5:1:93.

[0026] The preparation steps of the composite filter are as follows: Bentonite is dispersed in deionized water at 60℃ and stirred at high speed for 1 hour to allow it to fully expand, resulting in a bentonite suspension. Hexadecyltrimethylammonium bromide is dissolved in a small amount of hot water at 60℃ and slowly added to the bentonite suspension under vigorous stirring. The mixture is reacted in a constant temperature water bath at 75℃ for 6 hours to allow the cations of hexadecyltrimethylammonium bromide to exchange with the sodium ions of bentonite. After the reaction, the mixture is repeatedly centrifuged and washed until no pale yellow silver bromide precipitate is produced when tested with silver nitrate solution, yielding modified crude bentonite. The modified crude bentonite is dried at 105℃, ground, and passed through a 200-mesh sieve to obtain organo-modified bentonite. Mesoporous silica is vacuum dried at 120℃ for 4 hours to completely remove... To remove moisture from the pores of mesoporous silica, dry mesoporous silica was dispersed in anhydrous toluene under nitrogen protection. 3-Aminopropyltriethoxysilane was slowly added dropwise in a specific ratio, and the mixture was refluxed and stirred at 80°C for 12 hours to allow the dry mesoporous silica to react. After the reaction was complete, the mesoporous silica was alternately filtered and washed three times with anhydrous toluene and ethanol to remove the adsorbed silane. It was then vacuum dried at 80°C for 6 hours to obtain amino-functionalized mesoporous silica. The amino-functionalized mesoporous silica and organo-functionalized bentonite powder were added to a three-dimensional mixer in a specific ratio and mixed for 30 minutes until homogeneous to obtain a composite adsorbent. This composite adsorbent was then uniformly added to a cellulose acetate filter rod along with triacetin using a filter tip forming machine to produce a composite filter tip.

[0027] The mass ratio of bentonite, hexadecyltrimethylammonium bromide, and deionized water is 1:0.4:20; the mass ratio of hexadecyltrimethylammonium bromide to hot water at 60°C is 1:10; the mass ratio of mesoporous silica to 3-aminopropyltriethoxysilane is 1:0.8; anhydrous toluene is 20 times the mass of mesoporous silica; and the mass ratio of anhydrous toluene to ethanol is 1:1.

[0028] The mass ratio of amino-functionalized mesoporous silica to organo-functionalized bentonite is 2.5:1 to 3:1. The cellulose acetate filter rod is a standard cellulose acetate filter rod with a single length of 120 mm, a weight of 6.5 g, and a circumference of 24 mm. The ratio of cellulose acetate filter rod to composite adsorbent is 66.7:1. Triacetin accounts for 8% of the weight of the cellulose acetate filter rod.

[0029] The ternary composite solution comprises 0.9% to 1.2% of the base tobacco, the modified agarwood slow-release microcapsules comprise 0.6% to 1.0% of the base tobacco, and the mass ratio of the composite filter to the added tobacco is 1:1.5 to 1.8.

[0030] Example 2: A low-tar cigarette containing agarwood extract, comprising a composite filter and added tobacco shreds, the added tobacco shreds being composed of the following raw materials: 100 parts of base tobacco shreds, 0.8 parts of modified agarwood slow-release microcapsules, and 1.05 parts of ternary composite solution; The specific preparation steps for low-tar cigarettes containing agarwood extract are as follows: S1. Mix and stir the agarwood ethanol solution and β-cyclodextrin solution at a specific temperature to encapsulate the agarwood extract into the cavity structure of β-cyclodextrin, forming a basic inclusion complex; S2. Chitosan acetate solution was added to the basic inclusion complex, and a cross-linking reaction was carried out using glutaraldehyde to form a dense sustained-release film on the surface of the basic inclusion complex. The mixture after the reaction was filtered and washed, and then freeze-dried under vacuum to obtain powdered modified agarwood sustained-release microcapsules. S3. Dissolve trehalose, tripotassium citrate and glycerol in deionized water in proportion to prepare a ternary composite solution; S4. The modified agarwood slow-release microcapsules are mixed with the base tobacco shreds, and the ternary composite solution is sprayed evenly onto the base tobacco shreds in proportion to obtain tobacco shreds containing agarwood extract; S5. Natural bentonite was modified with hexadecyltrimethylammonium bromide to enhance its adsorption capacity for polar harmful substances, thus obtaining organic bentonite; S6. Mesoporous silica was grafted with 3-aminopropyltriethoxysilane to carry amino groups on its surface, thereby enhancing its adsorption capacity for nicotine and obtaining amino-functionalized mesoporous silica. S7. The prepared organic bentonite and amino-functionalized mesoporous silica are physically mixed in a mass ratio to obtain a composite adsorbent. This composite adsorbent is added to the cellulose acetate filter rod in a proportion to make a composite filter tip. S8. The tobacco shreds are rolled into cigarettes, attached to a composite filter, and sealed in packaging to obtain low-tar cigarettes containing agarwood extract.

[0031] The preparation steps of modified agarwood sustained-release microcapsules are as follows: Agarwood extract is obtained from dried agarwood using solvent extraction. The viscous agarwood extract is gently stirred with anhydrous ethanol in a 40-45℃ water bath until fully dissolved, resulting in a free-flowing agarwood ethanol solution. This reduces the viscosity of the agarwood extract, facilitating mixing with β-cyclodextrin. β-cyclodextrin is added to deionized water at 60℃ and stirred at 500 rpm until completely dissolved, forming a clear β-cyclodextrin solution. Under constant temperature of 60℃ and high-speed shear at 1000 rpm, the agarwood ethanol solution is slowly added dropwise to the β-cyclodextrin solution over 20-30 minutes. The mixture is then transferred to a constant temperature magnetic stirrer and reacted continuously at 300 rpm at 60℃ for 4 hours, allowing the agarwood ethanol solution to fully enter the hydrophobic cavities of the β-cyclodextrin solution, forming a basic inclusion complex. Chitosan powder is then added... A 1% glacial acetic acid solution was slowly added to the chitosan and stirred at room temperature for 4 hours until completely dissolved, yielding a chitosan colloidal solution. The basic inclusion complex was cooled to room temperature, and the chitosan colloidal solution was uniformly added to the basic inclusion complex in the form of a spray while stirring at a low speed of 200 rpm. Glutaraldehyde solution was slowly added dropwise, and the cross-linking reaction was carried out at 40°C for 2 hours. Under the action of the cross-linking agent, a dense semi-permeable membrane was formed on the surface of the basic inclusion complex. The chitosan colloidal solution after the reaction was completed was filtered, and a mixed washing solution made of deionized water and ethanol was used to wash the basic inclusion complex 3 times to remove unreacted cross-linking agent and other solvent impurities on the surface of the basic inclusion complex. The basic inclusion complex was placed in a vacuum freeze dryer, pre-frozen at -40°C for 4 hours, and then freeze-dried at -50°C and 10 Pa vacuum for 24 hours to obtain white to slightly yellow modified agarwood sustained-release microcapsules.

[0032] The mass ratio of agarwood extract to anhydrous ethanol was 1:1.5, the mass ratio of β-cyclodextrin to deionized water was 1:15, and the mass ratio of agarwood ethanol solution to β-cyclodextrin solution was 1:4.

[0033] The mass ratio of chitosan powder to 1% glacial acetic acid solution is 1:50, the mass ratio of chitosan colloidal solution to basic inclusion complex is 5:1, the glutaraldehyde solution is 0.5% of the total volume of chitosan colloidal solution, the mass ratio of deionized water to ethanol in the mixed washing solution is 7:3, and the amount of mixed washing solution used is three times that of basic inclusion complex.

[0034] The preparation steps of the ternary composite solution are as follows: In a mixing tank equipped with a stirring and heating jacket, add about 80% deionized water, heat to 50°C, add trehalose and tripotassium citrate, stir at 200 rpm until completely dissolved, stop heating, and when the temperature drops below 40°C, add glycerol and the remaining deionized water, continue stirring for 30 minutes to obtain a clear, homogeneous ternary composite solution without precipitate.

[0035] The mass ratio of trehalose, tripotassium citrate, glycerol, and deionized water is 4.5:1.5:1:93.

[0036] The preparation steps of the composite filter are as follows: Bentonite is dispersed in deionized water at 60℃ and stirred at high speed for 1 hour to allow it to fully expand, resulting in a bentonite suspension. Hexadecyltrimethylammonium bromide is dissolved in a small amount of hot water at 60℃ and slowly added to the bentonite suspension under vigorous stirring. The mixture is reacted in a constant temperature water bath at 75℃ for 6 hours to allow the cations of hexadecyltrimethylammonium bromide to exchange with the sodium ions of bentonite. After the reaction, the mixture is repeatedly centrifuged and washed until no pale yellow silver bromide precipitate is produced when tested with silver nitrate solution, yielding modified crude bentonite. The modified crude bentonite is dried at 105℃, ground, and passed through a 200-mesh sieve to obtain organo-modified bentonite. Mesoporous silica is vacuum dried at 120℃ for 4 hours to completely remove... To remove moisture from the pores of mesoporous silica, dry mesoporous silica was dispersed in anhydrous toluene under nitrogen protection. 3-Aminopropyltriethoxysilane was slowly added dropwise in a specific ratio, and the mixture was refluxed and stirred at 80°C for 12 hours to allow the dry mesoporous silica to react. After the reaction was complete, the mesoporous silica was alternately filtered and washed three times with anhydrous toluene and ethanol to remove the adsorbed silane. It was then vacuum dried at 80°C for 6 hours to obtain amino-functionalized mesoporous silica. The amino-functionalized mesoporous silica and organo-functionalized bentonite powder were added to a three-dimensional mixer in a specific ratio and mixed for 30 minutes until homogeneous to obtain a composite adsorbent. This composite adsorbent was then uniformly added to a cellulose acetate filter rod along with triacetin using a filter tip forming machine to produce a composite filter tip.

[0037] The mass ratio of bentonite, hexadecyltrimethylammonium bromide, and deionized water is 1:0.4:20; the mass ratio of hexadecyltrimethylammonium bromide to hot water at 60°C is 1:10; the mass ratio of mesoporous silica to 3-aminopropyltriethoxysilane is 1:0.8; anhydrous toluene is 20 times the mass of mesoporous silica; and the mass ratio of anhydrous toluene to ethanol is 1:1.

[0038] The mass ratio of amino-functionalized mesoporous silica to organo-functionalized bentonite is 2.5:1 to 3:1. The cellulose acetate filter rod is a standard cellulose acetate filter rod with a single length of 120 mm, a weight of 6.5 g, and a circumference of 24 mm. The ratio of cellulose acetate filter rod to composite adsorbent is 66.7:1. Triacetin accounts for 8% of the weight of the cellulose acetate filter rod.

[0039] The ternary composite solution comprises 0.9% to 1.2% of the base tobacco, the modified agarwood slow-release microcapsules comprise 0.6% to 1.0% of the base tobacco, and the mass ratio of the composite filter to the added tobacco is 1:1.5 to 1.8.

[0040] Example 3: A low-tar cigarette containing agarwood extract, comprising a composite filter and added tobacco shreds, the added tobacco shreds being composed of the following raw materials: 100 parts of base tobacco shreds, 1.0 part of modified agarwood slow-release microcapsules, and 1.2 parts of ternary composite solution; The specific preparation steps for low-tar cigarettes containing agarwood extract are as follows: S1. Mix and stir the agarwood ethanol solution and β-cyclodextrin solution at a specific temperature to encapsulate the agarwood extract into the cavity structure of β-cyclodextrin, forming a basic inclusion complex; S2. Chitosan acetate solution was added to the basic inclusion complex, and a cross-linking reaction was carried out using glutaraldehyde to form a dense sustained-release film on the surface of the basic inclusion complex. The mixture after the reaction was filtered and washed, and then freeze-dried under vacuum to obtain powdered modified agarwood sustained-release microcapsules. S3. Dissolve trehalose, tripotassium citrate and glycerol in deionized water in proportion to prepare a ternary composite solution; S4. The modified agarwood slow-release microcapsules are mixed with the base tobacco shreds, and the ternary composite solution is sprayed evenly onto the base tobacco shreds in proportion to obtain tobacco shreds containing agarwood extract; S5. Natural bentonite was modified with hexadecyltrimethylammonium bromide to enhance its adsorption capacity for polar harmful substances, thus obtaining organic bentonite; S6. Mesoporous silica was grafted with 3-aminopropyltriethoxysilane to carry amino groups on its surface, thereby enhancing its adsorption capacity for nicotine and obtaining amino-functionalized mesoporous silica. S7. The prepared organic bentonite and amino-functionalized mesoporous silica are physically mixed in a mass ratio to obtain a composite adsorbent. This composite adsorbent is added to the cellulose acetate filter rod in a proportion to make a composite filter tip. S8. The tobacco shreds are rolled into cigarettes, attached to a composite filter, and sealed in packaging to obtain low-tar cigarettes containing agarwood extract.

[0041] The preparation steps of modified agarwood sustained-release microcapsules are as follows: Agarwood extract is obtained from dried agarwood using solvent extraction. The viscous agarwood extract is gently stirred with anhydrous ethanol in a 40-45℃ water bath until fully dissolved, resulting in a free-flowing agarwood ethanol solution. This reduces the viscosity of the agarwood extract, facilitating mixing with β-cyclodextrin. β-cyclodextrin is added to deionized water at 60℃ and stirred at 500 rpm until completely dissolved, forming a clear β-cyclodextrin solution. Under constant temperature of 60℃ and high-speed shear at 1000 rpm, the agarwood ethanol solution is slowly added dropwise to the β-cyclodextrin solution over 20-30 minutes. The mixture is then transferred to a constant temperature magnetic stirrer and reacted continuously at 300 rpm at 60℃ for 4 hours, allowing the agarwood ethanol solution to fully enter the hydrophobic cavities of the β-cyclodextrin solution, forming a basic inclusion complex. Chitosan powder is then added... A 1% glacial acetic acid solution was slowly added to the chitosan and stirred at room temperature for 4 hours until completely dissolved, yielding a chitosan colloidal solution. The basic inclusion complex was cooled to room temperature, and the chitosan colloidal solution was uniformly added to the basic inclusion complex in the form of a spray while stirring at a low speed of 200 rpm. Glutaraldehyde solution was slowly added dropwise, and the cross-linking reaction was carried out at 40°C for 2 hours. Under the action of the cross-linking agent, a dense semi-permeable membrane was formed on the surface of the basic inclusion complex. The chitosan colloidal solution after the reaction was completed was filtered, and a mixed washing solution made of deionized water and ethanol was used to wash the basic inclusion complex 3 times to remove unreacted cross-linking agent and other solvent impurities on the surface of the basic inclusion complex. The basic inclusion complex was placed in a vacuum freeze dryer, pre-frozen at -40°C for 4 hours, and then freeze-dried at -50°C and 10 Pa vacuum for 24 hours to obtain white to slightly yellow modified agarwood sustained-release microcapsules.

[0042] The mass ratio of agarwood extract to anhydrous ethanol was 1:1.5, the mass ratio of β-cyclodextrin to deionized water was 1:15, and the mass ratio of agarwood ethanol solution to β-cyclodextrin solution was 1:4.

[0043] The mass ratio of chitosan powder to 1% glacial acetic acid solution is 1:50, the mass ratio of chitosan colloidal solution to basic inclusion complex is 5:1, the glutaraldehyde solution is 0.5% of the total volume of chitosan colloidal solution, the mass ratio of deionized water to ethanol in the mixed washing solution is 7:3, and the amount of mixed washing solution used is three times that of basic inclusion complex.

[0044] The preparation steps of the ternary composite solution are as follows: In a mixing tank equipped with a stirring and heating jacket, add about 80% deionized water, heat to 50°C, add trehalose and tripotassium citrate, stir at 200 rpm until completely dissolved, stop heating, and when the temperature drops below 40°C, add glycerol and the remaining deionized water, continue stirring for 30 minutes to obtain a clear, homogeneous ternary composite solution without precipitate.

[0045] The mass ratio of trehalose, tripotassium citrate, glycerol, and deionized water is 4.5:1.5:1:93.

[0046] The preparation steps of the composite filter are as follows: Bentonite is dispersed in deionized water at 60℃ and stirred at high speed for 1 hour to allow it to fully expand, resulting in a bentonite suspension. Hexadecyltrimethylammonium bromide is dissolved in a small amount of hot water at 60℃ and slowly added to the bentonite suspension under vigorous stirring. The mixture is reacted in a constant temperature water bath at 75℃ for 6 hours to allow the cations of hexadecyltrimethylammonium bromide to exchange with the sodium ions of bentonite. After the reaction, the mixture is repeatedly centrifuged and washed until no pale yellow silver bromide precipitate is produced when tested with silver nitrate solution, yielding modified crude bentonite. The modified crude bentonite is dried at 105℃, ground, and passed through a 200-mesh sieve to obtain organo-modified bentonite. Mesoporous silica is vacuum dried at 120℃ for 4 hours to completely remove... To remove moisture from the pores of mesoporous silica, dry mesoporous silica was dispersed in anhydrous toluene under nitrogen protection. 3-Aminopropyltriethoxysilane was slowly added dropwise in a specific ratio, and the mixture was refluxed and stirred at 80°C for 12 hours to allow the dry mesoporous silica to react. After the reaction was complete, the mesoporous silica was alternately filtered and washed three times with anhydrous toluene and ethanol to remove the adsorbed silane. It was then vacuum dried at 80°C for 6 hours to obtain amino-functionalized mesoporous silica. The amino-functionalized mesoporous silica and organo-functionalized bentonite powder were added to a three-dimensional mixer in a specific ratio and mixed for 30 minutes until homogeneous to obtain a composite adsorbent. This composite adsorbent was then uniformly added to a cellulose acetate filter rod along with triacetin using a filter tip forming machine to produce a composite filter tip.

[0047] The mass ratio of bentonite, hexadecyltrimethylammonium bromide, and deionized water is 1:0.4:20; the mass ratio of hexadecyltrimethylammonium bromide to hot water at 60°C is 1:10; the mass ratio of mesoporous silica to 3-aminopropyltriethoxysilane is 1:0.8; anhydrous toluene is 20 times the mass of mesoporous silica; and the mass ratio of anhydrous toluene to ethanol is 1:1.

[0048] The mass ratio of amino-functionalized mesoporous silica to organo-functionalized bentonite is 2.5:1 to 3:1. The cellulose acetate filter rod is a standard cellulose acetate filter rod with a single length of 120 mm, a weight of 6.5 g, and a circumference of 24 mm. The ratio of cellulose acetate filter rod to composite adsorbent is 66.7:1. Triacetin accounts for 8% of the weight of the cellulose acetate filter rod.

[0049] The ternary composite solution comprises 0.9% to 1.2% of the base tobacco, the modified agarwood slow-release microcapsules comprise 0.6% to 1.0% of the base tobacco, and the mass ratio of the composite filter to the added tobacco is 1:1.5 to 1.8.

[0050] Comparative Example 1: The difference between this comparative example and Example 1 is that this example does not contain modified agarwood sustained-release microcapsules.

[0051] Comparative Example 2 differs from Example 1 in that it does not contain a ternary composite solution.

[0052] Comparative Example 3 differs from Example 1 in that a composite filter was not used in this example.

[0053] Performance testing: The relevant properties of the samples prepared by the low-tar cigarette preparation method containing agarwood extract provided in Examples 1-3 and Comparative Examples 1-3 were tested respectively, and the test data are recorded in the table below: Among them, the stability of agarwood aroma release was tested on low-tar cigarettes containing agarwood extract prepared using the test methods in GB5606.4-2022, namely Experiment 1, Experiment 2, Experiment 3, Comparative Example 1, Comparative Example 2 and Comparative Example 3. The tar content of low-tar cigarettes containing agarwood extract was tested using the test methods in GB / T19609, Experiment 1, Experiment 2, Experiment 3, Comparative Example 1, Comparative Example 2 and Comparative Example 3. The CO content of low-tar cigarettes containing agarwood extract was tested using the test methods in GB / T23356, Experiment 1, Experiment 2, Experiment 3, Comparative Example 1, Comparative Example 2, and Comparative Example 3.

[0054] By comparing and analyzing the relevant data in the table, it can be seen that the low-tar cigarette containing agarwood extract prepared by this invention not only has good stability in releasing agarwood aroma, but also better reduces tar and CO content during combustion. This indicates that the preparation method of the low-tar cigarette containing agarwood extract provided by this invention has a broader market prospect and is more suitable for promotion.

[0055] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0056] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A low-tar cigarette containing agarwood extract, characterized in that, It includes a composite filter tip and tobacco shreds. The tobacco shreds are composed of the following raw materials: 100 parts of base tobacco shreds, 0.6 to 1.0 parts of modified agarwood slow-release microcapsules, and 0.9 to 1.2 parts of ternary composite solution; The preparation steps for the low-tar cigarette containing agarwood extract are as follows: S1. Mix and stir an ethanol solution of agarwood with a β-cyclodextrin solution at a specific temperature to form a basic inclusion complex; S2. Chitosan acetate solution was added to the basic inclusion complex, and cross-linking reaction was carried out using glutaraldehyde. The mixture after reaction was filtered and washed, and then freeze-dried under vacuum to obtain powdered modified agarwood sustained-release microcapsules. S3. Dissolve trehalose, tripotassium citrate and glycerol in deionized water in proportion to prepare a ternary composite solution; S4. The modified agarwood slow-release microcapsules are mixed with the base tobacco, and the ternary composite solution is sprayed onto the base tobacco in proportion to obtain tobacco containing agarwood extract; S5. Natural bentonite was modified with hexadecyltrimethylammonium bromide to obtain organo-modified bentonite; S6. Mesoporous silica was grafted with 3-aminopropyltriethoxysilane to obtain amino-functionalized mesoporous silica; S7. The prepared organic bentonite and amino-functionalized mesoporous silica are physically mixed in a mass ratio to obtain a composite adsorbent. This composite adsorbent is added to the cellulose acetate filter rod in a proportion to make a composite filter tip. S8. The tobacco shreds are rolled into cigarettes, attached to a composite filter, and sealed in packaging to obtain low-tar cigarettes containing agarwood extract.

2. The low-tar cigarette containing agarwood extract according to claim 1, characterized in that: The preparation steps of the modified agarwood sustained-release microcapsules are as follows: viscous agarwood extract and anhydrous ethanol are gently stirred in a water bath until fully dissolved to obtain an agarwood ethanol solution. β-cyclodextrin is added to deionized water and stirred until completely dissolved to form a β-cyclodextrin solution. Under constant temperature and high-speed shear conditions, the agarwood ethanol solution is slowly added dropwise to the β-cyclodextrin solution. The mixture is transferred to a constant temperature magnetic stirrer to form a basic inclusion complex. Chitosan powder is added to a 1% glacial acetic acid solution to obtain a chitosan colloidal solution. The basic inclusion complex is cooled to room temperature, and under low-speed stirring, the chitosan colloidal solution is added to the basic inclusion complex, along with glutaraldehyde solution. After the crosslinking reaction, the chitosan colloidal solution is filtered. A mixed washing solution is prepared using deionized water and ethanol to wash the basic inclusion complex. The basic inclusion complex is placed in a vacuum freeze dryer, pre-frozen, and then freeze-dried for 24 hours to obtain white to slightly yellow modified agarwood sustained-release microcapsules.

3. A low-tar cigarette containing agarwood extract according to claim 2, characterized in that: The mass ratio of agarwood extract to anhydrous ethanol is 1:1.5, the mass ratio of β-cyclodextrin to deionized water is 1:15, and the mass ratio of agarwood ethanol solution to β-cyclodextrin solution is 1:

4.

4. A low-tar cigarette containing agarwood extract according to claim 2, characterized in that: The mass ratio of chitosan powder to 1% glacial acetic acid solution is 1:50, the mass ratio of chitosan colloidal solution to basic inclusion complex is 5:1, the glutaraldehyde solution is 0.5% of the total volume of chitosan colloidal solution, the mass ratio of deionized water to ethanol in the mixed washing solution is 7:3, and the amount of the mixed washing solution is three times that of the basic inclusion complex.

5. A low-tar cigarette containing agarwood extract according to claim 1, characterized in that: The preparation steps of the ternary composite solution are as follows: In a mixing tank with a stirring and heating jacket, first add 80% deionized water, heat to 50°C, add trehalose and tripotassium citrate, stir until completely dissolved, and when the temperature drops below 40°C, add glycerol and the remaining deionized water, continue stirring to obtain the ternary composite solution.

6. A low-tar cigarette containing agarwood extract according to claim 5, characterized in that: The mass ratio of trehalose, tripotassium citrate, glycerol, and deionized water is 4.5:1.5:1:

93.

7. A low-tar cigarette containing agarwood extract according to claim 1, characterized in that: The preparation steps of the composite filter are as follows: Bentonite is dispersed in deionized water and stirred at high speed to allow it to fully expand, resulting in a bentonite suspension. Hexadecyltrimethylammonium bromide is dissolved in hot water at 60°C and slowly added to the bentonite suspension under vigorous stirring. The mixture is reacted in a constant temperature water bath for 6 hours. After the reaction, the mixture is repeatedly centrifuged and washed to obtain a modified crude bentonite. The modified crude bentonite is dried at 105°C and ground to obtain organo-modified bentonite. Mesoporous silica is dried under vacuum for 4 hours. The dried mesoporous silica... Dispersed in anhydrous toluene, 3-aminopropyltriethoxysilane was slowly added dropwise while stirring to allow the mesoporous silica to undergo a grafting reaction with the 3-aminopropyltriethoxysilane. The mesoporous silica was alternately filtered and washed with anhydrous toluene and ethanol, and then vacuum dried to obtain amino-functionalized mesoporous silica. The amino-functionalized mesoporous silica and organo-functionalized bentonite powder were added to a three-dimensional mixer in a certain proportion to obtain a composite adsorbent. The composite adsorbent was then uniformly added to a cellulose acetate filter rod together with triacetin through a filter tip forming machine to make a composite filter tip.

8. A low-tar cigarette containing agarwood extract according to claim 7, characterized in that: The mass ratio of bentonite, hexadecyltrimethylammonium bromide, and deionized water is 1:0.4:20; the mass ratio of hexadecyltrimethylammonium bromide to hot water at 60°C is 1:10; the mass ratio of mesoporous silica to 3-aminopropyltriethoxysilane is 1:0.8; the anhydrous toluene is 20 times the mass of mesoporous silica; and the mass ratio of anhydrous toluene to ethanol is 1:

1.

9. A low-tar cigarette containing agarwood extract according to claim 7, characterized in that: The mass ratio of the amino-functionalized mesoporous silica to the organo-functionalized bentonite is 2.5:1 to 3:

1. The cellulose acetate filter rod is a standard cellulose acetate filter rod with a single length of 120 mm, a weight of 6.5 g, and a circumference of 24 mm. The ratio of the cellulose acetate filter rod to the composite adsorbent is 66.7:

1. The triacetin is 8% of the weight of the cellulose acetate filter rod.

10. A low-tar cigarette containing agarwood extract according to claim 1, characterized in that: The ternary composite solution comprises 0.9% to 1.2% of the mass of the base tobacco, the modified agarwood slow-release microcapsules comprise 0.6% to 1.0% of the mass of the base tobacco, and the mass ratio of the composite filter tip to the added tobacco is 1:1.5 to 1.8.

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