Preparation method and use of carbon nanoparticles with the functions of reducing coking and hazards and adding fragrance

Abstract

The application discloses a preparation method and application of carbon nanoparticles with a coking reduction and harm reduction and a fragrance adding effect, and comprises the following steps: (1) pretreating plant raw materials to obtain plant particles for standby; (2) performing programmed temperature heating treatment on the pretreated plant particles; and (3) cooling the raw materials treated in the step (2) to room temperature under the condition of air isolation, and bonding the raw materials into particles with a particle size of 20-60 meshes by using a bonding agent, so that the carbon nanoparticles with the coking reduction and harm reduction and the fragrance adding effect are obtained. The carbon nanoparticles with the coking reduction and harm reduction can be used for adsorbing harmful substances in smoke in tobacco, and meanwhile, special tea aroma components of Wuyi rock tea or special flower aroma components of sophora japonica are not completely lost, and special fragrance is brought.

Description

Technical Field

[0001] This invention belongs to the field of cigarette material preparation technology, specifically relating to a method for preparing carbon nanoparticles with tar reduction, harm reduction, and flavoring effects, as well as their applications. Background Technology

[0002] Reducing tar and harm is an inevitable trend in the tobacco industry, but the resulting decrease in cigarette flavor and insufficient aroma has gradually become a prominent problem. How to reduce tar and harm while maintaining the aroma and quantity of cigarette smoke is one of the key areas of tobacco research. Current technologies for reducing tar and harm generally involve adding adsorbent materials such as activated carbon and micronized silica gel to adsorb harmful substances in the smoke. However, this also results in the adsorption of a large amount of aroma components, thus reducing the smoking quality of the cigarette.

[0003] The unique natural environment of Wuyi Mountain has given rise to the renowned Wuyi Rock Tea, a premium oolong tea. Wuyi Rock Tea boasts a long history of production and abundant varietal resources. It possesses a distinctive aroma, rich and lingering, with a full-bodied and mellow flavor; a quick and lasting sweet aftertaste; and a clear, bright golden-yellow liquor. Over 300 aromatic components have been detected in Wuyi Rock Tea. These aromatic components can be categorized into alcohols, aldehydes, ketones, esters, lactones, acids, phenols, heterooxides, sulfur-containing compounds, and nitrogen-containing compounds. However, the presence of catechins, tea polyphenols, alkaloids, flavonoids, and phenolic acids in Wuyi Rock Tea results in noticeable astringency and bitterness when added to cigarettes, limiting its application in cigarettes.

[0004] Sophora japonica flowers are derived from the dried flower buds and flowers of the legume Sophora japonica L., the former commonly known as "Sophora buds" and the latter as "Sophora flowers." Sophora japonica flowers have a long history of medicinal use, first recorded in the Tang Dynasty's *Rihuazi Materia Medica*. They are now cultivated in many parts of China, and my country is a major exporter of Sophora japonica medicinal materials. Sophora japonica buds are slightly cold in nature and possess antioxidant, anti-inflammatory, antiviral, and aldose reductase-inhibiting effects. They effectively combat free radicals and inhibit the growth and proliferation of tumor cells such as leukemia, prostate cancer, colorectal cancer, liver cancer, breast cancer, and glioma, thus playing a role in cancer prevention and treatment. However, the bitter taste and grassy odor of Sophora japonica flower buds limit their application in cigarettes.

[0005] To address the aforementioned issues, patent CN 110292203A employs a method of soft carbonization and fermentation to prepare porous particles with the natural charred aroma of plants, which are then added to tobacco to improve the quality of cigarette smoke. However, this method involves a complex and lengthy process, making it unsuitable for large-scale application. While existing technologies offer methods with shorter processing times, they generally suffer from the following problems: 1. Insufficient formation of pore structures during carbonization, making it difficult to control and resulting in poor aroma stability of the prepared plant particles; 2. Irregular and dispersed particle size after carbonization, making it difficult to ensure consistent product quality; 3. Carbonized plant particles only retain the natural charred aroma of the plant and do not readily possess the additional benefits of significant harm reduction and improved smoking quality.

[0006] The present invention is proposed to solve the above problems. Summary of the Invention

[0007] The first objective of this invention is to provide a method for preparing carbon nanoparticles with tar reduction, harm reduction, and fragrance enhancement effects. The second objective is to apply the prepared carbon nanoparticles with tar reduction, harm reduction, and fragrance enhancement effects.

[0008] The first objective of this invention is achieved by the following steps: (1) Pre-treat the plant raw materials to obtain plant granules for later use; (2) The pretreated plant particles were subjected to programmed heating treatment; (3) Cool the raw material after step (2) to room temperature under air-isolated conditions, and bind it with an adhesive to form particles with a particle size of 20 to 60 mesh, thus obtaining carbon nanoparticles with the functions of reducing char and adding fragrance.

[0009] Preferably, the plant material in step (1) is Wuyi rock tea or Sophora japonica buds.

[0010] Preferably, the plant material in step (1) is Wuyi rock tea, and the pretreatment is to crush and sieve the Wuyi rock tea to obtain Wuyi rock tea powder; the crushing and sieving is to pass it through an 80-100 mesh sieve.

[0011] Preferably, when the plant material in step (1) is Wuyi rock tea, the preparation of Wuyi rock tea powder mixture is also included before the programmed heating treatment. Specifically, reducing sugar and amino acid mixed powder and water are added to the Wuyi rock tea powder obtained after pretreatment, and the mixture is stirred evenly with the Wuyi rock tea powder for later use.

[0012] Preferably, the reducing sugar is any one or more of fructose, glucose, mannose, and galactose; and the amino acid is any one or more of arginine, glutamic acid, alanine, glycine, tyrosine, and asparagine.

[0013] Preferably, the mixing ratio of reducing sugar and amino acid is 1:9-9:1 (mass ratio); the addition ratio of the reducing sugar and amino acid mixed powder is 1-5% (mass ratio) of Wuyi rock tea powder; and the water addition ratio is 10-15% (mass ratio) of Wuyi rock tea powder.

[0014] Preferably, the plant material in step (1) is Sophora japonica buds, and the pretreatment is to air-dry the fresh Sophora japonica buds to make Sophora japonica buds, and then crush and sieve them to obtain Sophora japonica bud particles; the Sophora japonica buds are dried flower buds with a moisture content of 3wt%-5wt%; the crushing and sieving is to pass them through a 60-80 mesh sieve.

[0015] Preferably, when the plant material in step (1) is Wuyi rock tea, the heating process is as follows: in the first stage, the temperature is raised to 180-190℃ in 1-5 minutes and maintained at this temperature for 15-18 minutes; in the second stage, the temperature is rapidly raised to 400-600℃ in 1-5 minutes and maintained at this temperature for 10-15 seconds; when the plant material in step (1) is Sophora japonica buds, the programmed heating process is as follows: in the first stage, the temperature is raised from room temperature to 130℃-160℃ in 1-5 minutes and maintained for 7-12 minutes; in the second stage, the temperature is raised to 400℃-600℃ in 1-5 minutes and maintained for 5-10 seconds.

[0016] Preferably, the air isolation condition in step (3) is nitrogen protection.

[0017] Preferably, the adhesive used in step (3) is gelatin or sodium carboxymethyl starch.

[0018] The second objective of this invention is achieved by using the carbon nanoparticles obtained, which have the functions of reducing tar and harm and adding flavor, in tobacco for the purpose of reducing tar and harm and adding flavor.

[0019] Preferably, the specific method for using the carbon nanoparticles to reduce tar and harm and add flavor to tobacco is to add the carbon nanoparticles prepared in this invention to a binary composite filter rod of cigarettes, and the resulting cigarettes have the effects of reducing tar and harm and adding flavor.

[0020] The beneficial effects of this invention are: 1. The carbon nanoparticles obtained by this invention, which have the effect of reducing tar and harm, can be used in tobacco to adsorb a large amount of harmful substances in the smoke. While ensuring that the special rich and mellow tea aroma components of Wuyi rock tea or the special floral aroma components of locust flowers are not completely lost, they also bring a special aroma.

[0021] 2. The Wuyi rock tea charcoal particles obtained by this invention, which have the effect of reducing tar and harm, can be used in tobacco to adsorb a large amount of harmful substances in the smoke, such as tar, CO, TSNAs, etc., especially the adsorption effect on NNN [N-nitrosodemethylnicotine], NNK [4-(N-methyl-nitrosamine)-1-(3-pyridyl)-1-butanone] and HCN is more obvious.

[0022] 3. The preparation method of Wuyi rock tea charcoal particles with the effects of reducing char and harm and sweet aftertaste in the mouth in this invention involves dehydration in a short time after Maillard reaction at high temperature, while the dehydration time is not too short. Therefore, it ensures that the special rich and mellow tea aroma components of Wuyi rock tea are not completely lost, while bringing a special aroma.

[0023] 4. During the heating process described in this invention, various components in the tea undergo significant changes. The content of polyphenols, amino acids, and soluble sugars in the tea decreases, while the content of theaflavins and thearubigins increases due to oxidative polymerization at high temperatures to form theabrownins, resulting in a mellower and sweeter taste. Heating causes most of the grassy and astringent substances to volatilize and dissipate. Catechins, aldehydes, and alcohols oxidize and decompose, and through combination with amino acids, produce new aroma compounds, reducing bitterness. The Maillard reaction and caramelization reaction occur during tea roasting, producing large amounts of volatile substances with roasted aromas and sweetness, such as pyrazines, pyrroles, and furans. Reducing sugars and amino acids are the material basis for the Maillard reaction, while sugars themselves decompose and undergo caramelization, producing furfural and furan degradation products with a caramel aroma. Therefore, the Wuyi rock tea charcoal particles prepared in this invention, when used in cigarette filter rods, can bring a noticeable sweet aftertaste, improve the aftertaste, and reduce irritation during inhalation.

[0024] 5. The Sophora japonica charcoal nanoparticles obtained in this invention undergo dehydration at high temperature for a relatively short time, while ensuring that the unique floral aroma components of Sophora japonica flowers are largely preserved, while removing the bitterness and grassy odor of the buds and bringing a special sweet and caramel aroma. Furthermore, these Sophora japonica charcoal nanoparticles possess antioxidant activity, with significantly higher contents of total flavonoids, polysaccharides, and tannins compared to Sophora japonica buds. When used in tobacco, they can adsorb a large amount of harmful substances in the smoke. The scavenging rate of DPPH and ABTS free radicals by Sophora japonica charcoal nanoparticles is significantly increased compared to Sophora japonica buds, demonstrating a significantly enhanced antioxidant effect. Moreover, when used in cigarette filter rods, they have a significant beneficial effect on improving the aroma and added value of tobacco. Attached Figure Description

[0025] Figure 1 This is a graph showing the free radical scavenging ability of different Sophora japonica bud particles. Detailed Implementation

[0026] The present invention will be further described below with reference to embodiments, but this is not intended to limit the present invention in any way. Any modifications or substitutions made based on the teachings of the present invention shall fall within the protection scope of the present invention.

[0027] Example 1 This invention provides a method for preparing Sophora japonica charcoal granules, comprising the following steps: Step S1: Dry the fresh locust flower buds in the shade to make locust flower buds, then crush and sieve them to obtain locust flower bud powder.

[0028] The sophora flower buds comprise dried flower buds with a moisture content of 3wt%-5wt%. Further, in the crushing and sieving step, the sophora flower buds are passed through a 70-mesh sieve. It should be noted that this invention does not specifically limit the mesh size of the crushing and sieving process or the size of the resulting sophora flower powder.

[0029] Step S2: The crushed and sieved Sophora japonica powder is subjected to programmed heating treatment to obtain Sophora japonica charcoal powder.

[0030] In the programmed heating process, the heating process includes a first stage and a second stage. In the first stage, the temperature is raised from room temperature to 150°C within 3 minutes and held for 10 minutes. In the second stage, the temperature is raised to 500°C within 4 minutes and held for 8 seconds.

[0031] Step S3: Cool the heated Sophora japonica charcoal powder to room temperature under air-isolated conditions, which are nitrogen-filled protection.

[0032] Step S4: Use sodium carboxymethyl starch binder to bind the Sophora japonica charcoal powder into Sophora japonica charcoal particles with a particle size of 40 mesh.

[0033] Example 2 This invention provides a method for preparing Wuyi rock tea charcoal particles, comprising the following steps: Step S1: Air-dry the Wuyi rock tea to a moisture content of 4wt%, then pulverize it and pass it through a 90-mesh sieve to obtain Wuyi rock tea powder.

[0034] Step S2: Add reducing sugar and amino acid mixed powder and water to 100g of Wuyi rock tea powder obtained in step S1, and stir evenly with Wuyi rock tea powder for later use. The reducing sugar is 1g of fructose and 1g of glucose; the amino acids are 1g of arginine, 1g of glutamic acid and 1g of alanine (all by mass); the water addition ratio is 10% of Wuyi rock tea powder (by mass).

[0035] Step S3: Perform a programmed heating process on the Wuyi rock tea powder mixture to obtain Wuyi rock tea charcoal powder.

[0036] In the programmed heating process, the heating process includes a first stage and a second stage. In the first stage, the temperature is raised to 180°C in 4 minutes and maintained at this temperature for 15 minutes. In the second stage, the temperature is rapidly raised to 500°C in 2 minutes and maintained at this temperature for 12 seconds.

[0037] Step S4: Cool the carbonized powder obtained in step S3 to room temperature in the absence of air, and then purge with nitrogen for protection.

[0038] Step S5: Use sodium carboxymethyl starch binder to bind Wuyi rock tea charcoal powder into particles with a particle size of 20-60 mesh, to obtain Wuyi rock tea charcoal particles with the effects of reducing char and harm and providing a sweet aftertaste in the mouth.

[0039] Comparative Example 1 A method for preparing Sophora japonica bud granules, compared with Example 1, involves directly pulverizing and sieving air-dried Sophora japonica buds to obtain Sophora japonica bud powder, and then, without heating and carbonization, using an adhesive to bind the Sophora japonica bud powder into Sophora japonica bud granules with a particle size of 20-60 mesh.

[0040] Comparative Example 2 A method for preparing Wuyi rock tea granules, compared with Example 2, involves directly pulverizing and sieving air-dried Wuyi rock tea to obtain Wuyi rock tea powder, and then, without heating and carbonization, using an adhesive to bind the Wuyi rock tea powder into Wuyi rock tea granules with a particle size of 20-60 mesh.

[0041] Example 3 This invention also provides an application of charcoal particles in cigarettes, which can be used to reduce tar and harm in tobacco.

[0042] The particles prepared in Examples 1, 2, 1, and 2 of this invention were added to the binary composite filter rods of cigarettes, with 1.5 mg of particles added per millimeter of standard cigarette filter rod. Blank cigarettes without added plant particles were also tested according to the national standard GB 5606.5-2005. The test results are shown in Table 1. The harmful components of cigarette smoke were detected according to the following standards: GB / T 21130-2007 "Determination of Benzo[a]pyrene in Total Particulate Matter of Cigarette Smoke", YC / T 253-2008 "Determination of Hydrogen Cyanide in Mainstream Cigarette Smoke - Continuous Flow Method", YC / T 255-2008 "Determination of Phenolic Compounds in Mainstream Cigarette Smoke - High Performance Liquid Chromatography", YC / T254-2008 "Determination of Major Carbonyl Compounds in Mainstream Cigarette Smoke - High Performance Liquid Chromatography", YC / T377-2010 "Determination of Ammonia in Mainstream Cigarette Smoke - Ion Chromatography", GB / T 23356-2009 "Determination of Carbon Monoxide in Gas Phase of Cigarette Smoke - Non-scattering Infrared Method", and TCJC-ZY-IV-005-2012 "Determination of Tobacco-specific N-nitrosamines in Total Particulate Matter of Mainstream Cigarette Smoke - High Performance Liquid Chromatography-Tandem Mass Spectrometry". The results are shown in Table 2.

[0043] Table 1 Results of routine analysis of cigarette smoke Table 2 Results of analysis of harmful components in cigarettes The Sophora japonica charcoal particles with antioxidant activity prepared by this invention can be used in tobacco. They can adsorb a large amount of harmful substances in tobacco smoke, such as tar, CO, and TSNAs. In particular, the adsorption effect on NNN [N-nitrosodemethylnicotine], NNK [4-(N-methyl-nitrosamine)-1-(3-pyridyl)-1-butanone] and HCN is more obvious.

[0044] Example 4 Sensory evaluation of cigarettes: The particles prepared in Examples 1, 2, Comparative Examples 1 and 2 of this invention were added to the composite cigarette filter rods. 1.5 mg of particles were added per millimeter of standard cigarette filter rod, resulting in 50 cigarettes of Example 1, 50 cigarettes of Example 2, 50 cigarettes of Comparative Example 1, and 50 cigarettes of Comparative Example 2, respectively. 50 blank cigarettes without added plant particles were used as a control.

[0045] All the cigarettes mentioned above were placed in a constant temperature and humidity chamber (temperature 22±1℃, humidity 60±2%) for 48 hours to equilibrate. They were then evaluated by experts with cigarette evaluation qualifications in accordance with GB5606.4-2005 Cigarettes Part 4 Sensory Technical Requirements. The results are shown in Table 3.

[0046] Table 3. Smoking results of cigarettes with added granular composite filter rods As shown in Table 3, the charcoal particles prepared in Examples 1 and 2 of this invention, when added to the cigarette composite filter rod, resulted in cigarettes with higher smoking scores than the control sample; in particular, the aroma, irritation, and aftertaste were significantly better. Specifically, the Sophora japonica charcoal particles in Example 1 of this invention largely retained the unique fresh floral aroma components of the Sophora japonica flower, significantly enhancing the aroma of the tobacco and improving the aftertaste. It also removed the bitterness and grassy odor of the Sophora japonica buds, bringing a sweet and caramelized flavor profile and increasing the freshness, floral aroma, and sweetness. This improved the mellowness and harmony of the smoke, resulting in a comfortable and clean mouthfeel and enhancing the aroma quality of the cigarette. In contrast, the Sophora japonica charcoal particles in Comparative Example 1, without heating and mellowing carbonization, produced a bud aroma in the cigarette composite filter rod, but with a noticeable bitterness and grassy odor, significant irritation to the mouth and throat, and a bitter aftertaste.

[0047] In Example 2 of this invention, the Wuyi rock tea charcoal particles, when heated, cause most of the grassy and astringent substances to volatilize and dissipate, reducing bitterness. During tea roasting, two important reactions occur: the Maillard reaction and caramelization, producing a large amount of volatile substances with roasted, sweet, and caramel aromas. Therefore, the Wuyi rock tea charcoal particles prepared by this invention, when used in cigarette filter rods, can bring a noticeable sweet aftertaste to the mouth during inhalation, improve the aftertaste, and reduce irritation. In contrast, in Comparative Example 2, without heating and semi-carbonization, the resulting Wuyi rock tea particles, when added to the cigarette composite filter rod, still retain the bitterness and astringency of the tea itself, causing significant irritation to the mouth and throat, and leaving a bitter aftertaste.

[0048] Example 5 The antioxidant activity of the aforementioned Sophora japonica charcoal particles was tested, and the antioxidant activity was expressed as the ability to scavenge DPPH and ABTS free radicals. DPPH Method: 10g each of the Sophora japonica granules prepared in Example 1 and Comparative Example 1 were ultrasonically extracted with 10 mL of ethanol for 30 min. The extract was filtered and set aside. The extract was mixed thoroughly with 30 mL of 0.1 mmol / L DPPH solution. After reacting at room temperature in the dark for 30 min, the absorbance A1 was measured at a wavelength of 517 nm. Simultaneously, the absorbance A0 of the mixture of DPPH solution and anhydrous ethanol was measured. Using 10 μg / mL ascorbic acid as a positive control, the inhibition rate of ascorbic acid against DPPH free radicals was determined using the same method. The free radical scavenging rate was calculated according to the following formula: In the formula: A 0 The absorbance is the result of mixing DPPH solution with anhydrous ethanol. A 1The absorbance is the result of mixing the extract and the DPPH solution.

[0049] ABTS Method: Prepare a 7 mmol / L ABTS solution and a 2.6 mmol / L K₂S₂O₈ solution. After mixing, store the mixture at room temperature in the dark for 12-16 hours. Before use, dilute to an absorbance of 0.7 ± 0.02. Extract 10 g each of the Sophora japonica granules prepared in Example 1 and Comparative Example 1 using 10 mL of ethanol via ultrasonic extraction for 30 min. Filter the extract and set aside. Mix the extract with 30 mL of ABTS reaction solution and react for 30 min. Measure the absorbance A₁ at 734 nm. Simultaneously, measure the absorbance A₀ of the mixture of ABTS solution and anhydrous ethanol. Using 50 µg / mL ascorbic acid as a positive control, determine the inhibition rate of ascorbic acid against ABTS free radicals using the same method. Calculate the free radical scavenging rate using the following formula: In the formula: A 0 represents the absorbance of the mixture of ABTS solution and anhydrous ethanol; A 1 represents the absorbance of the mixture of extract and ABTS solution.

[0050] The scavenging ability of different Sophora japonica florets against DPPH free radicals was evaluated, and the results are as follows: Figure 1 As shown, the DPPH and ABTS scavenging abilities of Example 1 are relatively strong, with a free radical scavenging rate of approximately 85%. In contrast, the Sophora japonica granules of Comparative Example 1 have lower antioxidant capacity.

[0051] The present invention provides a method for preparing Sophora japonica charcoal particles and their application in cigarettes. These Sophora japonica charcoal particles contain antioxidant activity and have significantly higher contents of total flavonoids, polysaccharides, and tannins than Sophora japonica buds. When used in tobacco, they can adsorb a large amount of harmful substances in the smoke. The charcoal particles have a significantly higher DPPH and ABTS free radical scavenging rate than Sophora japonica buds, and their antioxidant effect is significantly enhanced. Furthermore, when used in cigarette filter rods, they have a significant beneficial effect on improving the aroma and added value of tobacco.

Claims

1. A method for preparing carbon nanoparticles with tar reduction, harm reduction, and flavoring effects, characterized in that... The steps include the following: (1) The plant raw materials are pretreated to obtain plant granules for later use; the plant raw materials are Wuyi rock tea or Sophora japonica buds; (2) The pretreated plant particles were subjected to programmed heating treatment; When the plant material in step (1) is Wuyi rock tea, the heating treatment is as follows: in the first stage, the temperature is raised to 180-190℃ in 1-5 minutes and this temperature is maintained for 15-18 minutes. In the second stage, the temperature is rapidly increased to 400-600℃ in 1-5 minutes and maintained at this temperature for 10-15 seconds; when the plant material in step (1) is Sophora japonica buds, the programmed heating treatment is as follows: in the first stage, the temperature is increased from room temperature to 130℃-160℃ in 1-5 minutes and maintained for 7-12 minutes; in the second stage, the temperature is increased to 400℃-600℃ in 1-5 minutes and maintained for 5-10 seconds; (3) Cool the raw material after step (2) to room temperature under air-isolated conditions, and bind it with an adhesive to form particles with a particle size of 20 to 60 mesh, thus obtaining carbon nanoparticles with the functions of reducing char and adding fragrance.

2. The method for preparing carbon nanoparticles with tar reduction, harm reduction, and flavoring effects according to claim 1, characterized in that... The plant material in step (1) is Wuyi rock tea. The pretreatment is to crush and sieve the Wuyi rock tea to obtain Wuyi rock tea powder. The crushing and sieving is to pass it through an 80-100 mesh sieve.

3. The method for preparing carbon nanoparticles with tar reduction, harm reduction, and aroma-enhancing effects according to claim 1, characterized in that... When the plant raw material in step (1) is Wuyi rock tea, the preparation of Wuyi rock tea powder mixture is also included before the programmed heating treatment. Specifically, reducing sugar and amino acid mixed powder and water are added to the Wuyi rock tea powder obtained after pretreatment, and the mixture is stirred evenly with the Wuyi rock tea powder for later use.

4. The method for preparing carbon nanoparticles with tar reduction, harm reduction, and aroma-enhancing effects according to claim 3, characterized in that... The reducing sugar is any one or more of fructose, glucose, mannose, and galactose; the amino acid is any one or more of arginine, glutamic acid, alanine, glycine, tyrosine, and asparagine.

5. The method for preparing carbon nanoparticles with tar reduction, harm reduction, and aroma-enhancing effects according to claim 3, characterized in that... The mixing ratio of reducing sugar and amino acids is 1:9-9:1 by mass; the addition ratio of the mixed powder of reducing sugar and amino acids is 1-5% of the mass of Wuyi rock tea powder; and the water addition ratio is 10-15% of the mass of Wuyi rock tea powder.

6. The method for preparing carbon nanoparticles with tar reduction, harm reduction, and aroma-enhancing effects according to claim 1, characterized in that... The plant material in step (1) is Sophora japonica buds. The pretreatment is to air-dry the fresh Sophora japonica buds to make Sophora japonica buds, and then crush and sieve them to obtain Sophora japonica bud particles. The Sophora japonica buds are dried flower buds with a moisture content of 3wt%-5wt%. The crushing and sieving is to pass them through a 60-80 mesh sieve.

7. The use of carbon nanoparticles with tar reduction, harm reduction and flavoring effects obtained by any one of the preparation methods according to claims 1-6 for tar reduction, harm reduction and flavoring in tobacco.

8. The use according to claim 7, characterized in that... The specific method for using the carbon nanoparticles to reduce tar and harm and add flavor to tobacco is to add the prepared carbon nanoparticles to the binary composite filter rod of cigarettes, and the resulting cigarettes have the effects of reducing tar and harm and adding flavor.

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