Spicy plant composite particle based on MOF multi-stage slow release, preparation method of spicy plant composite particle and cigarette
By combining MOF materials with aromatic plant particles, a multi-stage slow-release carrier is constructed, which solves the problems of excessively rapid aroma release and insufficient persistence, achieving uniform and slow release of aroma and improving the smoking experience of cigarettes.
Patent Information
- Application Number
- CN202511856253.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-10
- Publication Date
- 2026-01-27
AI Technical Summary
Existing cigarettes have aroma components that are released too quickly, lack persistence, and have poor evenness in smoking. Traditional plant particles have insufficient loading capacity and lack precise control over pore structure.
By combining MOF materials with spice plant particles and employing depressurized internal boiling extraction and wet granulation processes, a multi-stage slow-release carrier is constructed to achieve efficient loading and slow release of spice components.
It significantly improves the aroma quality and persistence during cigarette smoking, enhances smoking comfort and the uniformity of aroma style, and overcomes the defect of aroma being strong at the beginning and weak at the end.
Smart Images
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Abstract
Description
Technical Field
[0001] This invention relates to the field of tobacco technology, and in particular to a spice plant composite granule based on MOF multi-stage sustained release, its preparation method, and cigarettes. Background Technology
[0002] In recent years, with the increasing health awareness of consumers and the advancement of the major project to reduce tar and harm in cigarettes, traditional cigarettes have generally faced problems such as decreased aroma richness, weakened style recognition, and reduced smoking comfort. Adding natural plant particles to cigarette filters is a common technique for improving the aroma quality. Plant particles typically use the plant material itself as a carrier, loading aroma components through physical adsorption or simple impregnation. However, this method has certain limitations: most plant particles only possess macroscopic pores with limited specific surface area, resulting in insufficient loading capacity for aroma components; their pore structure lacks precise controllability, leading to weak binding force between aroma components and the carrier, resulting in rapid release of aroma components during smoking and difficulty in effectively controlling the release.
[0003] Metal-organic frameworks (MOFs), as a novel type of porous material, have demonstrated outstanding performance in fields such as drug controlled release and catalytic conversion due to their high specific surface area, well-ordered pore structure, and tunable pore size. Of particular note is the highly ordered microporous structure of MOFs, whose nanoscale pores enable precise capture and controlled release of aroma molecules through size effects and surface interactions.
[0004] Therefore, developing composite particles that combine the microporous properties of MOF materials with the macroporous advantages of plant carriers to construct a true multi-stage sustained-release system has significant application value in solving problems such as excessively rapid aroma release, insufficient persistence, and poor draw uniformity in existing technologies. To this end, this invention proposes a novel process for preparing spice plant composite particles based on the multi-stage sustained-release function of metal-organic frameworks (MOFs). Summary of the Invention
[0005] In view of this, the present invention provides a spicy plant composite particle based on MOF multi-stage sustained release. The present invention achieves efficient loading and multi-stage sustained release of spicy components, thereby significantly improving the aroma quality and persistence during cigarette smoking.
[0006] This invention innovatively introduces MOF materials into a spice plant particle system, constructing a plant solid product-MOF composite porous carrier. Combined with reduced-pressure internal boiling extraction and wet granulation processes, it achieves efficient loading and multi-stage sustained release of spice components, thereby significantly improving the aroma quality and persistence during cigarette smoking. This invention also provides a method for applying spice plant particles in cigarettes, which can improve the aroma quality and highlight the aroma style, enhancing the comfort of smoking cigarettes.
[0007] This invention provides a method for preparing spice plant composite particles based on MOF multi-stage sustained release, comprising the following steps:
[0008] A) After pulverizing the aromatic plant raw materials, solvent extraction was used to obtain the extract and solid product;
[0009] B) Mix the solid product, binder, MOF material and extract, and granulate to obtain the final product;
[0010] The MOF material is one or more of the following: γ-CD-MOF, MOF-5, ZIF-5, etc.
[0011] The present invention provides a method for preparing spice plant composite particles based on MOF multi-stage sustained release, which first involves pulverizing spice plant raw materials.
[0012] The aromatic plant ingredients described in this invention include, but are not limited to, one or more of star anise, cinnamon, cloves, dried plum, fennel, nutmeg, or lemongrass;
[0013] The pulverization refers to pulverizing to 100-150 mesh; specifically, it can be 100 mesh, 110 mesh, 120 mesh, 130 mesh, 140 mesh, 150 mesh; or any value between the two mentioned above.
[0014] Spicy plant powder and extraction solvent are mixed at a mass ratio of 1:5 to 1:10 and placed in a vacuum internal boiling extraction device. Under certain conditions, the extract and solid product are obtained by vacuum filtration or centrifugation. The mass ratio of the spicy plant raw material to the extraction solvent is specifically 1:5, 1:6, 1:7, 1:8, 1:9 or 1:10.
[0015] The extraction solvent described in this invention is an ethanol-water mixed solvent, with an ethanol content of 40% to 60% (volume percentage); specifically, it can be 40%, 45%, 50%, 55%, or 60%.
[0016] The extraction temperature is 40 ℃~80 ℃, specifically 40 ℃, 45 ℃, 50 ℃, 55 ℃, 60 ℃, 65 ℃, 70 ℃, 75 ℃, 80 ℃;
[0017] The extraction time is 30 min to 90 min, specifically 30 min, 40 min, 50 min, 60 min, 70 min, 80 min, and 90 min.
[0018] The extraction pressure is 20 kPa to 50 kPa. Specifically, it can be 20 kPa, 25 kPa, 30 kPa, 35 kPa, 40 kPa, 45 kPa, or 50 kPa; or any value within the range of any two of the above.
[0019] The present invention preferably dries the obtained solid product to a moisture content of ≤5%; specifically, the solid residue is dried in a vacuum drying oven at a drying pressure of ≤0.08 MPa and a temperature of 40-60 ℃ for 1-6 h.
[0020] The solid product, binder, and MOF material are mixed to obtain a mixture. The binder is at least one of sodium carboxymethyl cellulose, sodium alginate, or guar gum, and its addition amount is 3% to 5% of the mass of the dried solid product; specifically, it can be 3%, 4%, or 5%. The MOF material is added at 1% to 10% of the mass of the dried solid product; specifically, it can be 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, or 10%.
[0021] Add the extract from step A) to the mixture in batches, mix well, and stir to form a plastic wet material.
[0022] The resulting wet material is fed into a vibrating pellet mill or a high-speed mixing pellet mill for pelleting.
[0023] The granulation time described in this invention is 5 to 15 minutes; specifically, it can be 5 minutes, 6 minutes, 7 minutes, 8 minutes, 9 minutes, 10 minutes, 11 minutes, 12 minutes, 13 minutes, 14 minutes, or 15 minutes.
[0024] The granulation is performed using a gyratory granulator with a gyratory frequency of 40 Hz to 60 Hz; specifically, it can be 40 Hz, 45 Hz, 50 Hz, 55 Hz, or 60 Hz.
[0025] The granulation process involves sieving and drying; then cooling to room temperature to obtain spice plant granules.
[0026] The sieving process involves passing through a sieve with a mesh size of 20 to 40; specifically, it can be 20 mesh, 25 mesh, 30 mesh, 35 mesh, or 40 mesh.
[0027] The drying process is carried out at 40–60 °C for 50–90 min.
[0028] The MOF material specifically implemented in this invention is a cyclodextrin-based MOF (γ-CD-MOF). The synthesis method of the γ-CD-MOF specifically includes:
[0029] Potassium hydroxide and γ-CD are ultrasonically dissolved in ultrapure water, the pH of the solution is adjusted, filtered, crystallized, and dried to obtain the final product.
[0030] Specifically, the molar ratio of potassium hydroxide to γ-CD is 8:1; the pH of the solution is adjusted to 13; the filtration is performed using a 0.45 μm organic membrane; and the crystallization is carried out by natural diffusion crystallization in a container filled with methanol.
[0031] After crystallization, the crystals were collected, washed, and vacuum dried to obtain γ-CD-MOF.
[0032] This invention provides a spice plant composite particle based on MOF multi-stage sustained release, which is prepared by any of the preparation methods described in the above technical solutions.
[0033] The preparation method described above has been clearly described in this invention, and will not be repeated here.
[0034] This invention provides a flavoring additive, comprising the MOF-based multi-stage sustained-release spice plant compound particles described in the above technical solution.
[0035] The composite particles of the present invention are composed of a dry solid product and MOF material to form a composite porous carrier. The pungent components in the extract are uniformly loaded in the pores of the carrier, which has a multi-stage sustained-release function.
[0036] This invention provides a cigarette in which the filter rod contains the aromatic plant composite particles based on MOF multi-stage sustained release as described in the above technical solution.
[0037] The composite particles are used as flavoring and aroma-enhancing additives in cigarette filters to improve the spicy and plant-based flavor of cigarettes and enhance the smoking experience.
[0038] The amount of the MOF-based multi-stage sustained-release aromatic plant composite particles added to cigarettes according to this invention is 0.1wt%~2wt%; specifically, it can be 0.1wt%, 0.3wt%, 0.5wt%, 0.7wt%, 0.9wt%, 1.1wt%, 1.3wt%, 1.5wt%, 1.7wt%, 1.9wt%, or 2wt%.
[0039] This method utilizes the synergistic effect of the macroscopic pores of plant residues and the micropores of MOF materials to jointly construct a multi-stage sustained-release carrier. This structure enables graded adsorption and controlled release of spicy components of different molecular sizes, effectively overcoming the defect of traditional particulate aromas being "strong at the beginning and weak at the end," ensuring a uniform, slow, and sustained release of aroma throughout the smoking process, and greatly improving the continuity and comfort of the smoking experience.
[0040] The preparation method of the present invention has mild and controllable conditions for plant raw materials, without harsh reaction conditions or complicated post-processing steps, and is easy to promote and apply.
[0041] This invention provides a method for preparing spice plant composite particles based on MOF multi-stage sustained release, comprising the following steps: A) pulverizing spice plant raw materials and extracting them with a solvent to obtain an extract and a solid product; B) mixing the solid product, binder, MOF material, and extract, and granulating to obtain the final product; wherein the MOF material is one or more of γ-CD-MOF, MOF-5, ZIF-5, etc. The microporous structure of the MOF material and the macroporous structure of the dried plant solid product constitute a multi-stage sustained-release carrier, effectively loading and slowly releasing spice components, achieving a slow, uniform, and sustained release of aroma during cigarette smoking. These composite particles can be applied to cigarette filters, slowly releasing spice flavor as smoke passes through, significantly improving cigarette aroma quality, extending aroma duration, and improving smoking comfort. The process of this invention is simple to operate, has high raw material utilization, low processing intensity, and is easy to industrialize. Attached Figure Description
[0042] Figure 1 The amount and rate of eugenol transferred per puff in cigarettes from different samples were determined. Detailed Implementation
[0043] This invention provides a multi-stage sustained-release spice plant composite granule based on MOF, its preparation method, and a cigarette. Those skilled in the art can refer to the content of this document and appropriately modify the process parameters to achieve the same result. It should be particularly noted that all similar substitutions and modifications are obvious to those skilled in the art and fall within the scope of this invention. The method and application of this invention have been described through preferred embodiments. Those skilled in the art can clearly modify or appropriately change and combine the method and application described herein without departing from the content, spirit, and scope of this invention to realize and apply the technology of this invention.
[0044] It should be understood that the expression “one or more of…” individually includes each of the objects described after the expression, as well as various different combinations of two or more of the described objects, unless otherwise understood from the context and usage. The expression “and / or” combined with three or more described objects should be understood to have the same meaning, unless otherwise understood from the context.
[0045] The terms “including,” “having,” or “containing,” including the use of their grammatical synonyms, should generally be understood as open-ended and non-restrictive, for example, not excluding other unstated elements or steps, unless otherwise specifically stated or understood from the context.
[0046] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. A and B can be singular or plural.
[0047] In this application, "at least one" means one or more, and "more than one" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or multiple items.
[0048] It should be understood that the order of the steps or the order in which certain actions are performed is not important as long as the invention remains operational. Furthermore, two or more steps or actions can be performed simultaneously.
[0049] The use of any and all instances or exemplary language such as “e.g.” or “including” in this document is merely intended to better illustrate the invention and is not intended to limit the scope of the invention unless the claims are made. No language in this specification should be construed as indicating that any unclaimed element is essential to the practice of the invention.
[0050] Furthermore, the numerical ranges and parameters used to define the present invention are approximate values, and the relevant values in the specific embodiments have been presented as precisely as possible. However, any value inevitably contains standard deviations due to individual test methods. Therefore, unless explicitly stated otherwise, it should be understood that all ranges, quantities, values, and percentages used in this disclosure are modified with the word "approximately". Here, "approximately" generally means that the actual value is within plus or minus 10%, 5%, 1%, or 0.5% of a specific value or range.
[0051] It should be understood that in the various embodiments of this application, the order of the above processes does not imply the order of execution. Some or all steps may be executed in parallel or sequentially. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.
[0052] The embodiments and comparative examples of this invention describe some examples, in which the embodiments illustrate certain implementations of the invention. However, this does not mean that the effects of the invention can only be achieved in these examples.
[0053] To further illustrate the present invention, the following describes in detail a composite coating process provided by the present invention with reference to embodiments.
[0054] Example 1: Preparation of clove granules, the steps are as follows:
[0055] (1) Crush the clove bud raw material, control the output particle size to ≤1 mm, and sieve to obtain clove powder of 100~150 mesh;
[0056] (2) The clove powder obtained in step (1) was mixed with 80% ethanol solvent at a ratio of 1:6 (mass ratio) and extracted in a vacuum internal boiling extraction device at an extraction temperature of 65 ℃, an extraction time of 45 min and an extraction pressure of 25 kPa.
[0057] (3) Centrifuge the extraction system obtained in step (2) to obtain the extract and solid residue;
[0058] (4) The solid residue obtained in step (3) is dried in a vacuum drying oven at 55 °C and 0.08 MPa until the moisture content is ≤5% and then set aside for later use.
[0059] (5) Mix the solid residue obtained in step (4) with 3% (by mass) sodium alginate until homogeneous;
[0060] (6) Add the extract obtained in step (3) to the mixture obtained in step (5) in batches, and mix and stir until a clump of wet material is formed;
[0061] (7) Put the wet material obtained in step (6) into a high-speed mixing granulator and granulate it using a 40-mesh sieve for 10 min.
[0062] (8) The wet granules obtained in step (7) are dried at 45 °C for 50 min and cooled to room temperature to obtain clove spice plant granules.
[0063] The clove granules obtained in step (8) are added to the cigarette filter rod at 1% of the total weight of the cigarette to prepare clove granule filter rod cigarettes.
[0064] Example 2: Preparation of clove-γ-CD-MOF composite particles, the steps are as follows:
[0065] (1) Dissolve potassium hydroxide and γ-CD in ultrapure water in a molar ratio of 8:1 using ultrasound to prepare a solution with a CD concentration of 0.05 M, and adjust the pH of the solution to 13. Filter the solution through a 0.45 μm organic membrane, place it in a container containing methanol for natural diffusion crystallization, collect the crystals, wash and vacuum dry them to obtain γ-CD-MOF, grind the crystals and pass them through a 150-mesh sieve for later use.
[0066] (2) The clove bud raw material is crushed and processed, and the output particle size is controlled to be ≤1 mm. The clove powder is obtained by sieving to 100~150 mesh.
[0067] (3) The clove powder obtained in step (2) was mixed with 80% ethanol solvent at a ratio of 1:6 (mass ratio) and extracted in a vacuum internal boiling extraction device at an extraction temperature of 65 ℃, an extraction time of 45 min and an extraction pressure of 25 kPa.
[0068] (4) Centrifuge the extraction system obtained in step (3) to obtain the extract and solid residue;
[0069] (5) The solid residue obtained in step (4) is dried in a vacuum drying oven at 55 °C and 0.08 MPa until the moisture content is ≤5% and then set aside for later use.
[0070] (6) Mix the solid residue obtained in step (5) with sodium alginate (3% by mass ratio) and γ-CD-MOF (2% by mass ratio) until homogeneous.
[0071] (7) Add the extract obtained in step (3) to the mixture obtained in step (6) in batches, and mix and stir until a clump of wet material is formed;
[0072] (8) Put the wet material obtained in step (7) into a high-speed mixing granulator and granulate it using a 40-mesh sieve for 10 min.
[0073] (9) The wet granules obtained in step (8) are dried at 45 °C for 50 min and cooled to room temperature to obtain clove spice plant granules.
[0074] The clove-MOF composite particles obtained in step (9) are added to the cigarette filter rod at 1% of the total weight of the cigarette to prepare clove-MOF composite particle filter rod cigarettes.
[0075] Comparative Example 1: Preparation of clove-activated carbon composite particles, the steps are as follows:
[0076] (1) Crush the clove bud raw material, control the output particle size to ≤1 mm, and sieve to obtain clove powder of 100~150 mesh;
[0077] (2) The clove powder obtained in step (1) was mixed with 80% ethanol solvent at a ratio of 1:6 (mass ratio) and extracted in a vacuum internal boiling extraction device at an extraction temperature of 65 ℃, an extraction time of 45 min and an extraction pressure of 25 kPa.
[0078] (3) Centrifuge the extraction system obtained in step (2) to obtain the extract and solid residue;
[0079] (4) The solid residue obtained in step (4) is dried in a vacuum drying oven at 55 °C and 0.08 MPa until the moisture content is ≤5% and then set aside for later use.
[0080] (5) Mix the solid residue obtained in step (4) with sodium alginate (3% by mass ratio) and food-grade activated carbon (200 mesh) (2% by mass ratio of solid residue) until uniform;
[0081] (6) Add the extract obtained in step (3) to the mixture obtained in step (5) in batches, and mix and stir until a clump of wet material is formed;
[0082] (7) The subsequent granulation, drying and cigarette addition steps are the same as in Example 2. Clove-mesoporous silica composite particles are obtained and added to the cigarette filter rod at 1% of the total weight of the cigarette to obtain clove-activated carbon composite particle filter rod cigarettes.
[0083] Comparative Example 2: Preparation of Clove-Mesoporous Silica Composite Particles
[0084] (1) Crush the clove bud raw material, control the output particle size to ≤1 mm, and sieve to obtain clove powder of 100~150 mesh;
[0085] (2) The clove powder obtained in step (1) was mixed with 80% ethanol solvent at a ratio of 1:6 (mass ratio) and extracted in a vacuum internal boiling extraction device at an extraction temperature of 65 ℃, an extraction time of 45 min and an extraction pressure of 25 kPa.
[0086] (3) Centrifuge the extraction system obtained in step (2) to obtain the extract and solid residue;
[0087] (4) The solid residue obtained in step (4) is dried in a vacuum drying oven at 55 °C and 0.08 MPa until the moisture content is ≤5% and then set aside for later use.
[0088] (5) Mix the solid residue obtained in step (4) with sodium alginate (3% by mass ratio) and mesoporous silica SBA-15 (200 mesh) (2% by mass ratio of solid residue) until uniform;
[0089] (6) Add the extract obtained in step (3) to the mixture obtained in step (5) in batches, and mix and stir until a clump of wet material is formed;
[0090] (7) The subsequent granulation, drying, and cigarette addition steps are the same as those in granulation 2. Clove-mesoporous silica composite particles are obtained and added to the cigarette filter rod at 1% of the total weight of the cigarette to obtain clove-mesoporous silica composite particle filter rod cigarettes.
[0091] Cigarettes with different particle filter rods were used as test cigarettes, with cigarettes without added aromatic plant particles serving as a blank control for sensory evaluation. All cigarettes were equilibrated for 48 hours at a temperature of (22±1)℃ and a relative humidity of (60±2)% before the test.
[0092] Seven sensory evaluators were organized to conduct sensory evaluations based on the YC / T 415-2011 sensory evaluation method for tobacco products. Table 1 shows the quantitative description of the individual sensory evaluation indicators using a 9-point scoring system.
[0093] Alternatively, following the method in GB / T 16450-2004, in ISO mode, with six puffs, smoking was performed using a rotary smoking machine equipped with a puff-by-puff device. Six Cambridge filters (Ø 44 mm) were used to capture the mainstream particulate matter from six puff sequences of 20 cigarettes. After smoking, the six Cambridge filters were transferred to conical flasks, and 12 mL of 15.00 μg / mL internal standard dichlorohydrin solution was added to each. The flasks were ultrasonically vibrated for 25 min, and the extracts were filtered through a membrane for GC analysis.
[0094] Table 1. Quantitative description of individual sensory evaluation indicators using a 9-point scoring system.
[0095]
[0096] The specific results are shown in Table 2 below:
[0097] Table 2 Sensory evaluation scores for different samples
[0098]
[0099] As shown in Table 2, Comparative Examples 1 and 2, which added porous composite particles, showed improvements in aroma quality and quantity compared to Example 1 (without porous material), indicating that activated carbon and mesoporous silica possess a certain ability to adsorb and release aroma. However, Example 2 (clove-MOF composite particles) scored significantly higher (8.5) in the "puff uniformity" index than all comparative examples and Example 1. It also exhibited a fuller aroma, significantly improved texture, pronounced spicy characteristics, delicate and smooth smoke, better penetration and impurity removal, significantly reduced irritation, and noticeable improvements in oral dryness, cleanliness, and sweetness. This demonstrates that MOF materials have irreplaceable advantages in achieving slow and uniform aroma release and enhancing the continuity of the puffing experience.
[0100] Figure 1 The amount and rate of eugenol transfer per puff in cigarettes from different samples; Figure 1 It can be seen that, with the increase of the number of puffs, the amount and rate of eugenol transferred in the mainstream smoke of Examples 1 and 2 generally showed a gradual increasing trend, reaching the maximum value in the last puff (i.e., the 6th puff). Furthermore, the amount and rate of eugenol transferred in Example 1 were higher than those of Example 2, and the upward trend of the amount and rate of eugenol transferred in Example 1 was significantly higher than that of Example 2. The descriptive statistical analysis of the eugenol transfer rate of different cigarette samples is shown in Table 3. The range and RSD value of the eugenol transfer rate of Example 1 were much higher than those of Example 2, indicating that the transfer stability of Example 2 was significantly better than that of Example 1. This is consistent with the sensory evaluation results showing that the smoking uniformity of Example 2 was better than that of Example 1.
[0101] Table 3. Descriptive statistical analysis of eugenol transfer rate per puff in different cigarette samples.
[0102]
[0103] The applicant declares that this invention illustrates a method for preparing and applying MOF-based multi-stage sustained-release spice plant composite particles through the above embodiments. However, this invention is not limited to the above embodiments, meaning that this invention does not necessarily rely on the above embodiments for implementation. Those skilled in the art should understand that any improvements to this invention, such as equivalent substitutions of raw materials, addition of auxiliary components, and selection of specific methods, fall within the protection and disclosure scope of this invention.
Claims
1. A method for preparing spice plant composite particles based on MOF multi-stage sustained release, characterized in that, Includes the following steps: A) After pulverizing the aromatic plant raw materials, solvent extraction was used to obtain the extract and solid product; B) Mix the solid product, binder, MOF material and extract, and granulate to obtain the final product; The MOF material is one or more of γ-CD-MOF, MOF-5, and ZIF-5.
2. The preparation method according to claim 1, characterized in that, The specific method for synthesizing the γ-CD-MOF includes: Potassium hydroxide and γ-CD were ultrasonically dissolved in ultrapure water, the pH of the solution was adjusted, filtered, crystallized, and dried to obtain the final product. The molar ratio of potassium hydroxide to γ-CD was 8:
1. The pH of the solution was adjusted to 13. The filtration was performed using a 0.45 μm organic membrane. The crystallization was carried out by natural diffusion crystallization in a container filled with methanol.
3. The preparation method according to claim 2, characterized in that, The extraction temperature in step A) is 40 ℃~80 ℃, the extraction time is 30 min~90 min, and the extraction pressure is 20 kPa~50 kPa.
4. The preparation method according to claim 1, characterized in that, The aromatic plant ingredients include one or more of star anise, cinnamon, cloves, dried plum, fennel, nutmeg, or lemongrass; The pulverization is performed to a mesh size of 100-150; the extraction solvent is an ethanol-water mixture with an ethanol content of 40%-60%; and the mass ratio of the pungent plant material to the extraction solvent is 1:5-1:
10.
5. The preparation method according to claim 1, characterized in that, Step B) The solid product is dried to a moisture content of ≤5%; the drying equipment for the solid product is a vacuum drying oven, with a drying pressure of ≤0.08 MPa and a temperature of 40~60 ℃ for 1~6 h. The binder is at least one of sodium carboxymethyl cellulose, sodium alginate, or guar gum, and its addition amount is 3% to 5% of the mass of the dried solid product; the MOF material is added at 1% to 10% of the mass of the dried solid product.
6. The preparation method according to claim 1, characterized in that, The granulation time is 5 to 15 minutes; the granulation is carried out using a gyratory granulator with a gyratory frequency of 40 Hz to 60 Hz. The granulation process is followed by sieving and drying; the sieving process involves passing the material through a 20-40 mesh sieve; the drying process is carried out at 40-60°C for 50-90 minutes.
7. A spice plant composite granule based on MOF multi-stage sustained release, characterized in that, It is prepared by the preparation method according to any one of claims 1 to 6.
8. A flavoring and aroma-enhancing additive, characterized in that, Including the MOF-based multi-stage sustained-release spice plant composite particles as described in claim 7.
9. A cigarette, characterized in that, The cigarette filter rod contains the aromatic plant composite particles based on MOF multi-stage sustained release as described in claim 7.
10. The cigarette according to claim 9, characterized in that, The amount of the MOF-based multi-stage sustained-release spice plant composite particles added to cigarettes is 0.1wt%~2wt%.