Preparation method for extract, extract, atomizing liquid, and atomizing device

Abstract

A preparation method for an extract, comprising the following steps: carrying out microwave pyrolysis on a tobacco raw material in a flowing gas, the microwave pyrolysis comprising heating to a preset microwave pyrolysis temperature, and maintaining the preset microwave pyrolysis temperature, wherein the preset microwave pyrolysis temperature is 100°C-600°C, the heating time is 10 min-60 min, and the holding time is 10 min-60 min; collecting gaseous pyrolysis products in at least one gas collection device at a temperature below 0°C via the flowing gas; and combining collected liquids in the at least one gas collection device to obtain an extract. The extract comprises 2-methylpyrazine, 2(5H)-furanone, 2,3-dimethylpyrazine, and methyl cyclopentenolone. Incorporating the extract prepared by the method to an atomizing liquid can improve the aroma richness and tobacco-like sensation of the atomizing liquid.

Description

Preparation method of extract, extract, atomizing liquid and atomizing device

[0001] Cross-reference to related applications

[0002] This disclosure is based on and claims priority to Chinese Patent Application No. 202411186962.0, filed on August 27, 2024, entitled “Method for preparing an extract, extract, atomizing liquid and atomizing device”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of tobacco technology, and in particular to a method for preparing an extract, the extract, an atomizing liquid, and an atomizing device. Background Technology

[0004] Due to differences in temperature and smoking mechanisms, novel tobacco products produce significantly fewer harmful components than traditional cigarettes. In the context of international tobacco control, novel tobacco products represent a future direction for the tobacco industry. However, the significant differences in flavor between novel tobacco products and traditional cigarettes have become a bottleneck hindering their rapid development. Therefore, there is an urgent need to find substances that can compensate for the lack of aroma components in novel tobacco products to improve their smoking quality.

[0005] Currently, research mainly focuses on using different extraction and separation techniques, such as solvent extraction, supercritical extraction, and molecular distillation, to obtain aroma substances suitable for new tobacco products from tobacco. However, the extracts obtained by these methods are not satisfactory in terms of aroma and taste.

[0006] Therefore, a new extraction method needs to be developed to improve the quality of the extract in terms of aroma, taste, and other aspects. Summary of the Invention

[0007] In view of this, the main objective of this disclosure is to provide a method for preparing an extract, the extract, an atomizing liquid, and an atomizing device. The extract obtained by the preparation method of this disclosure can enhance the aroma intensity and smoke-like sensation, provide a taste that is closer to traditional tobacco products, improve the smoking quality of tobacco products, and enhance the safety of the extract.

[0008] Therefore, the first aspect of this disclosure provides a method for preparing an extract, comprising the following steps: microwave pyrolysis of tobacco raw materials in a flowing gas, wherein the microwave pyrolysis includes heating to a set microwave pyrolysis temperature and holding at the set microwave pyrolysis temperature; wherein the set microwave pyrolysis temperature is 100℃-600℃, the heating time is 10min-60min, the holding time is 10min-60min, the gaseous pyrolysis products are collected in at least one gas collection device at a temperature below 0℃ by the flowing gas, and the collected liquids in at least one gas absorption device are combined to obtain an extract, wherein the extract comprises 2-methylpyrazine, 2(5H)-furanone, 2,3-dimethylpyrazine, and methylcyclopentenolone.

[0009] In some implementations, the gas includes one or more of air, oxygen, or an inert gas.

[0010] In some embodiments, the gas flow rate is 100 mL / min to 200 mL / min.

[0011] In some embodiments, the temperature of the gas collection device is below 0°C, preferably -5°C to -20°C.

[0012] In some embodiments, the preparation method further includes filtering the combined collected liquid to obtain an extract.

[0013] In some implementations, the tobacco raw material includes one or more of tobacco leaves, tobacco stems, and tobacco extracts.

[0014] The second aspect of this disclosure also provides an extract prepared according to the preparation method described in the first aspect of this disclosure.

[0015] In some embodiments, the extract includes 2-methylpyrazine, 3-methylfuran, 2(5H)-furanone, γ-butyrolactone, 2,3-dimethylpyrazine, 3-methylvaleric acid, methylcyclopentenolone, benzyl alcohol, furanone, isomaltol, maltol, phenethyl alcohol, 4-oxoisoflurone, 4-hydroxy-β-dihydrodamascone, guaiacol; or

[0016] The extracts include bread ketone, 2-methylpyrazine, 3-furfural, 2,3-dimethylpyrazine, 2(5H)-furanone, 5-methylfurfural, methylcyclopentenolone, mesmin, geraniol acetone, ambroxol, farnesylacetone, damascene, and β-turfatone.

[0017] A third aspect of this disclosure also provides an atomizing liquid comprising an extract prepared according to the preparation method described in the first aspect of this disclosure or an extract described in the second aspect of this disclosure, wherein the content of the extract is 0.01%-5% based on the total weight of the atomizing liquid.

[0018] The fourth aspect of this disclosure also provides an atomizing device, including the atomizing liquid described in the third aspect of this disclosure.

[0019] The extract preparation method disclosed herein simulates the reaction during tobacco combustion through microwave pyrolysis, collecting the pyrolysis products as an extract. This extract, when applied to atomizing liquids, enhances the aroma intensity and tobacco-like sensation of the liquid, resulting in an aroma and flavor closer to traditional tobacco products and providing users with a superior smoking experience. This disclosure utilizes microwave heating for pyrolysis, resulting in a rapid heating rate that better simulates the tobacco combustion process. Furthermore, the method ensures uniform heating, improving the quality and stability of the extract. In addition, this preparation method eliminates the need for multiple organic solvents during extraction, reducing safety risks and making the production process green and safe. Attached Figure Description

[0020] Figure 1 is a photograph of the heating element smear condition when the atomizing liquid prepared from the extract of Example 1 is used in an electronic atomizer.

[0021] Figure 2 is a photograph of the heating element core state when the nebulizer prepared with the extract of Comparative Example 1 is used in an electronic atomizer.

[0022] Figure 3 is a photograph of the heating element core state when the atomizing liquid prepared from the extract of Example 2 is used in an electronic atomizer.

[0023] Figure 4 is a photograph of the heating element paste state when the atomizing liquid prepared from the extract of Comparative Example 2 is used in an electronic atomizer. Detailed Implementation

[0024] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0025] Throughout this specification, unless otherwise specified, the terminology used herein should be understood as having the meaning commonly used in the art. Therefore, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. In the event of any conflict, this specification shall prevail.

[0026] It should be noted that, in the embodiments of this disclosure, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a method or apparatus that includes a list of elements includes not only the elements expressly described, but also other elements not expressly listed, or elements inherent to implementing the method or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other related elements in the method or apparatus that includes that element.

[0027] It should be noted that the terms "first," "second," and "third" used in the embodiments of this disclosure are merely to distinguish similar objects and do not represent a specific ordering of objects. It is understood that "first," "second," and "third" can be interchanged in a specific order or sequence where permitted. It should be understood that the objects distinguished by "first," "second," and "third" can be interchanged where appropriate so that the embodiments of this disclosure described herein can be implemented in an order other than those illustrated or described herein.

[0028] Electronic cigarettes and other types of non-combustible tobacco products have low evaporation temperatures, so they can only simulate the aroma of cigarettes with flavorings. However, most non-combustible tobacco products on the market have a relatively low degree of smoke simulation. The tobacco flavor products are mainly based on charred and roasted aromas, combined with a small amount of tobacco puree, which cannot perfectly simulate the characteristic aroma of traditional cigarette combustion, especially the characteristic top aroma of tobacco is seriously lacking.

[0029] Currently, techniques such as solvent extraction, supercritical fluid extraction, and molecular distillation are commonly used to extract aroma compounds from tobacco raw materials. However, the tobacco extracts prepared by these methods often lack complete aroma and characteristic tobacco flavor. In related technologies, dry distillation is commonly used to heat and pyrolyze tobacco raw materials. This method is inefficient, time-consuming, and results in uneven heating, easily leading to unstable products.

[0030] In view of the above, the first aspect of this disclosure provides a method for preparing an extract, comprising the following steps:

[0031] The process involves microwave pyrolysis of tobacco raw materials in a flowing gas. The microwave pyrolysis includes heating to a set microwave pyrolysis temperature and holding at the set microwave pyrolysis temperature. The set microwave pyrolysis temperature is 100℃-600℃, the heating time is 10min-60min, and the holding time is 10min-60min. The gaseous pyrolysis products are collected in at least one gas collection device at a temperature below 0℃ by the flowing gas. The collected liquids in at least one gas absorption device are combined to obtain an extract. The extract includes 2-methylpyrazine, 2(5H)-furanone, 2,3-dimethylpyrazine, and methylcyclopentenolone.

[0032] Traditional cigarette combustion is a pyrolysis process. This disclosure simulates the combustion process of traditional cigarettes using microwave pyrolysis. Pyrolysis products are carried out by flowing gas and collected in a gas collection bottle to obtain an extract, thereby increasing the variety of aroma components in the extract. When the obtained extract is applied to novel tobacco products, it can enhance the aroma intensity and tobacco-like sensation, thus improving the smoking characteristics and pleasure of the novel tobacco products, making them more similar to the taste of traditional cigarettes and enhancing the user's smoking experience. Using microwave pyrolysis ensures uniform heating of the tobacco leaves, which is beneficial for improving the quality and stability of the extract. Furthermore, in the preparation method of this disclosure, pyrolysis products are collected using a gas collection device at a temperature below 0°C, and condensation is used to enrich the pyrolysis products in the gas collection device. This eliminates the need for other organic solvents to collect or treat the pyrolysis products, reducing safety risks. The production method is green and safe, and the absence of other organic solvents avoids the aroma loss and sensory discomfort caused by organic solvents. The extract prepared by the method disclosed herein does not require purification and can be directly used for atomizing fluid preparation. Furthermore, the prepared atomizing fluid significantly reduces wicking and carbon buildup.

[0033] In this disclosure, the microwave pyrolysis temperature is set to 100℃-600℃. By keeping the microwave pyrolysis temperature within this range, it is beneficial for the generation and volatilization of the mainstream tobacco smoke components, while avoiding the problem of unpleasant odors caused by excessively high temperatures, thus providing a smoking experience closer to that of traditional cigarettes. Exemplarily, the microwave pyrolysis temperature can be set to 100℃, 150℃, 200℃, 250℃, 300℃, 350℃, 400℃, 450℃, 500℃, 550℃, 600℃, or a value between any two of these values. In some embodiments, the microwave pyrolysis temperature is set to 400℃-600℃.

[0034] In this disclosure, the heating time is 10-60 minutes. By keeping the heating time within this range, the tobacco raw material can be fully decomposed during the heating process, releasing more aroma components, enhancing the aroma intensity and tobacco-like sensation of the extract, thereby improving the user's smoking experience. For example, the heating time can be 10 minutes, 15 minutes, 20 minutes, 25 minutes, 30 minutes, 35 minutes, 40 minutes, 45 minutes, 50 minutes, 55 minutes, 60 minutes, or a value within a range of any two of these values.

[0035] In this disclosure, the heat preservation time is 10-60 minutes. Heat preservation further promotes the full release of tobacco substances from the tobacco raw material within the corresponding temperature range, enhancing the aroma intensity of the extract and thus improving the user's smoking experience. For example, the heat preservation time can be 10 minutes, 15 minutes, 20 minutes, 25 minutes, 30 minutes, 35 minutes, 40 minutes, 45 minutes, 50 minutes, 55 minutes, 60 minutes, or a value within a range of any two of these values.

[0036] In this disclosure, pyrolysis products are collected using a gas collection device at a temperature below 0°C, eliminating the need for other organic solvents to collect or treat the products. This reduces safety risks and avoids sensory discomfort such as aroma loss and unpleasant taste caused by organic solvents. Exemplarily, the temperature of the gas collection device can be 0°C, -5°C, -10°C, -15°C, -20°C, -25°C, -30°C, or any two of these values. In some embodiments, the temperature of the gas collection device is below 0°C, preferably between -5°C and -20°C.

[0037] In this disclosure, the extract comprises 2-methylpyrazine, 2(5H)-furanone, 2,3-dimethylpyrazine, and methylcyclopentenolone. 2-methylpyrazine provides nutty and roasted aromas, 2(5H)-furanone provides roasted and tobacco aromas, 2,3-dimethylpyrazine provides charred protein and cocoa aromas, and methylcyclopentenolone provides coffee, tobacco, and caramel aromas.

[0038] In some embodiments, the gas includes one or more of air, oxygen, or an inert gas. Using such a gas facilitates the extraction of gaseous pyrolysis products and allows for adjustment of the oxygen content to obtain pyrolysis products with different drawability. For example, when the pyrolysis reaction does not require oxygen, using an inert gas, such as nitrogen, can both extract the gaseous pyrolysis products and increase the content of aroma components within them. When the pyrolysis reaction requires oxygen, air or oxygen can be used to adjust the oxygen content of the pyrolysis reaction system. Higher oxygen content in the system results in more substances contributing to a sweet taste in the pyrolysis products, thereby enhancing the sweetness of the extract.

[0039] In some embodiments, the gas flow rate is 100 mL / min to 200 mL / min. Maintaining a gas flow rate within this range facilitates the removal of pyrolysis products from the microwave pyrolysis of tobacco raw materials from the reaction system, and allows the gas collection device to fully condense the pyrolysis products, reducing the loss of aroma substances and enhancing the aroma intensity and tobacco-like sensation of the extract. Exemplarily, the gas flow rate can be 100 mL / min, 120 mL / min, 140 mL / min, 160 mL / min, 180 mL / min, 200 mL / min, or a value within a range of any two of these values.

[0040] In this disclosure, the gas flow rate can be controlled using methods known in the art, without any particular limitation. Exemplarily, the gas flow rate is controlled by a mass flow controller.

[0041] In some embodiments, the preparation method further includes filtering the collected pyrolysis products after collection. Filtration removes any solid impurities that may be present in the pyrolysis products, thereby improving the purity of the extract.

[0042] In some embodiments, the tobacco raw material includes one or more of tobacco leaves, tobacco stems, and tobacco extracts. In this disclosure, tobacco extract refers to a natural extract obtained from tobacco leaves, including but not limited to tobacco leaf extract, tobacco aqueous extract, and tobacco alcohol extract.

[0043] The second aspect of this disclosure also provides an extract prepared according to the preparation method described in the first aspect of this disclosure. The extract prepared by the method of this disclosure has abundant aroma components; when applied to an atomizing liquid, it can enhance the aroma intensity and smoke-like sensation of the atomizing liquid, thereby improving the user's smoking experience.

[0044] In some embodiments, the extract includes 2-methylpyrazine, 3-methylfuran, 2(5H)-furanone, γ-butyrolactone, 2,3-dimethylpyrazine, 3-methylvaleric acid, methylcyclopentenolone, benzyl alcohol, furanone, isomaltol, maltol, phenethyl alcohol, 4-oxoisoflurone, 4-hydroxy-β-dihydrodamascone, and guaiacol. In other embodiments, the extract includes baker's ketone, 2-methylpyrazine, 3-furfural, 2,3-dimethylpyrazine, 2(5H)-furanone, 5-methylfurfural, methylcyclopentenolone, mesmin, geranylacetone, ambroxol, farnesylacetone, damascone, and β-turacolone. These substances are mainly aroma compounds produced by the decomposition of sugars, proteins, and alkaloids in tobacco raw materials. For example, the main decomposition products of sugars are furan compounds, mainly furfural, 5-methylfurfural, and 5-hydroxymethylfurfural. After proteins are decomposed into amino acids, they undergo Maillard reactions with sugars to produce pyrazines, furans, and pyran compounds. This helps to increase the intensity and richness of tobacco aroma, modify the smoke, and mask unpleasant odors in tobacco.

[0045] A third aspect of this disclosure also provides an atomizing liquid, comprising an extract prepared according to the preparation method of the first aspect of this disclosure or an extract of the second aspect of this disclosure, wherein the content of the extract is 0.01%-5% based on the total weight of the atomizing liquid. By adding the extract of this disclosure to the atomizing liquid, the aroma intensity, flavor, strength, and tobacco-like sensation of the atomizing liquid can be enhanced, making the inhalation experience closer to that of traditional cigarettes and improving the user's inhalation experience. Exemplarily, the content of the extract, based on the total weight of the atomizing liquid, can be 0.01%, 0.05%, 0.1%, 0.2%, 0.5%, 0.8%, 1.0%, 1.5%, 2.0%, 2.5%, 3.0%, 3.5%, 4.0%, 4.5%, 5.0%, or a value within a range of any two of these values. In some embodiments, the content of the extract, based on the total weight of the atomizing liquid, is 0.01%-2%.

[0046] In some embodiments, the atomizing fluid further includes an atomizing agent, which includes one or more of propylene glycol and glycerol.

[0047] In some embodiments, the content of the atomizing agent is 95%-99.99% based on the total weight of the atomizing liquid.

[0048] The fourth aspect of this disclosure also provides an atomizing device, including the atomizing liquid of the third aspect of this disclosure.

[0049] The present disclosure will now be described in further detail with reference to specific embodiments. These descriptions are merely illustrative and not intended to limit the scope of the disclosure.

[0050] Example

[0051] The tobacco leaves and tobacco extracts used in the following examples were purchased from Yunnan Henggang Technology Co., Ltd., and the propylene glycol was purchased from SKC, South Korea.

[0052] The thermocouples used in the following examples are type K thermocouples;

[0053] The mass flow controller is an AS200 mass flow controller;

[0054] The instrument used for microwave pyrolysis was a vertical microwave pyrolysis reactor CY-CR1000C-M;

[0055] The instrument used for hot reflux extraction was an SF-2L small-scale reflux apparatus.

[0056] Example 1

[0057] Weigh 50g of tobacco leaves and place them in a pyrolysis tube. Insert a thermocouple and introduce nitrogen gas at a flow rate of 200mL / min using a mass flow controller. After preparation, start the microwave pyrolysis reaction. Set the microwave pyrolysis temperature to 400℃, the heating time to 400℃ to 60min, and the holding time to 20min. During the holding period, the microwave will automatically turn on when the temperature is 2℃ below the preset temperature and automatically turn off when the temperature is 2℃ above the preset temperature. Under the blowing of the gas flow, the gaseous substances produced by pyrolysis enter the first condensate gas collection bottle at 0℃. The remaining gaseous substances are carried by the introduced gas into three condensate gas collection bottles at -20℃. Finally, the pyrolysis products condense into liquid substances. Combine the condensates from all the gas collection bottles and filter them through a 0.45μm filter membrane to obtain the extract.

[0058] Comparative Example 1

[0059] Weigh 50g of tobacco leaves and add them to a round-bottom flask. Add 80% ethanol at a mass ratio of 1:10. Perform hot reflux extraction using an SF-2L small-scale reflux apparatus at an extraction temperature of 65℃ for 120 minutes. After extraction, filter and collect the filtrate. Concentrate the filtrate using a rotary evaporator to obtain the extract.

[0060] Sensory evaluation

[0061] The extract was added to an atomizing agent in a propylene glycol (PG) to glycerol (VG) ratio of 5:5 at a mass ratio of 1:1000 to obtain the atomizing liquid. The atomizing liquid was then loaded into a disposable electronic atomizer. Seven judges conducted sensory evaluations, assessing aroma, vapor production, balance, penetration, strength, irritation, and aftertaste. The sensory evaluation primarily used aroma, vapor production, balance, penetration, strength, irritation, and aftertaste as criteria, combined with the sensory characteristics of electronic cigarettes. The scoring criteria for the sensory evaluation are shown in Table 1.

[0062] Table 1: Scoring Criteria for Sensory Evaluation

[0063] Aroma component detection

[0064] The obtained extract was analyzed by gas chromatography-mass spectrometry (GC-MS).

[0065] Gas chromatography (GC) test conditions:

[0066] Chromatographic column: DB-5MS (60m*0.25mm*0.25μm);

[0067] Injection volume: 2 μL;

[0068] Flow split ratio: 10:1;

[0069] Inlet temperature: 200℃;

[0070] Carrier gas: High-purity He gas;

[0071] Flow rate: 1.5 mL / min;

[0072] Temperature program: Hold at 40℃ for 2 min, increase to 150℃ at a rate of 3℃ / min and hold for 2 min, increase to 300℃ at a rate of 5℃ / min and hold for 1 min, and finally increase to 320℃ at a rate of 10℃ / min and hold for 1 min.

[0073] Mass spectrometry (MS) testing conditions:

[0074] Ion source temperature: 300℃;

[0075] Transmission line temperature: 280℃;

[0076] Scan range: m / z 33-350.

[0077] Volatile compounds in the samples were retrieved by computer and qualitatively identified using the NIST 2.0 mass spectrometry database and the Aroma Office database. Semi-quantitative analysis was performed using the internal standard method, and the content of each aroma component was calculated based on the ratio of its peak area to the internal standard peak area. Results were accurate to 0.01 μg / g.

[0078] Paste core test experiment

[0079] The extract was added to the atomizing agent at a mass ratio of 1:1000 to propylene glycol (PG): glycerol (VG) = 5:5 to obtain the atomizing liquid. The atomizing liquid was loaded into an atomizer equipped with a 6.5W battery, and simulated vaping was performed using a vaping machine with the vaping parameters set to 1200 puffs. After vaping, the electronic atomizer was disassembled, the atomizer coil was removed, cut open, photographed, and the carbon buildup thickness was measured using an optical electron microscope.

[0080] The extracts of Example 1 and Comparative Example 1 were subjected to sensory evaluation, aroma component detection, and core paste testing according to the methods described above. The results of the sensory evaluation are shown in Table 2, the results of the aroma component detection are shown in Tables 3-4, and the results of the core paste testing are shown in Figures 1-2 and Table 5.

[0081] Table 2: Sensory evaluation results of the extracts from Example 1 and Comparative Example 1

[0082] Table 3: Number and total content of aroma components in the extracts of Example 1 and Comparative Example 1

[0083] Table 4: Content of key aroma components (μg / g) in the extracts of Example 1 and Comparative Example 1

[0084] Table 5: Paste core test results of the extracts from Example 1 and Comparative Example 1

[0085] The sensory evaluation results show that the extract prepared in Example 1 of this disclosure has a richer aroma sensation, stronger smoke feel, strength, and aftertaste compared to the extract prepared in Comparative Example 1, further replicating the cigarette smoking experience. The aroma component detection results show that the number and total content of aroma components in the extract prepared by the method of this disclosure are significantly higher than those in the extract prepared by the hot reflux method in Comparative Example 1. Furthermore, the extract of this disclosure contains 15 aroma components that contribute to sensory perception but are absent in the extract of Comparative Example 1. These are 2-methylpyrazine, 3-methylfuran, 2(5H)-furanone, γ-butyrolactone, 2,3-dimethylpyrazine, 3-methylvaleric acid, methylcyclopentenolone, benzyl alcohol, furanone, isomaltol, maltol, phenethyl alcohol, 4-oxoisoflurone, 4-hydroxy-β-dihydrodamascone, and guaiacol. The results of the core-paste test show that the extract prepared in Example 1 of this disclosure significantly reduces the problems of core-paste and carbon buildup compared to Comparative Example 1.

[0086] Example 2

[0087] Weigh 50g of tobacco extract and place it in a pyrolysis tube. Insert a thermocouple and introduce air at a flow rate of 200mL / min using a mass flow controller. After preparation, start the microwave pyrolysis reaction. Set the microwave pyrolysis temperature to 300℃, the heating time to 300℃ to 30℃ to 30min, and the holding time to 20min. Under the influence of the airflow, the gaseous substances produced by pyrolysis enter the first condensate gas absorption bottle at 0℃. The remaining gaseous substances are carried by the introduced gas into the three condensate gas absorption bottles at -10℃. Combine the condensates from all gas collection bottles and filter using a 0.45μm filter membrane to obtain the extract.

[0088] Comparative Example 2

[0089] Weigh 50g of tobacco extract and add 500g of anhydrous ethanol for alcohol precipitation to obtain refined tobacco extract. The parameters for the alcohol precipitation process are as follows: prepare the mixture according to the ratio of raw material to anhydrous ethanol = 1:10 (W:W), and settle at -18℃ for 12h.

[0090] The extracts of Example 2 and Comparative Example 2 were subjected to sensory evaluation, aroma component testing and paste core testing according to the above method. The sensory evaluation results are shown in Table 6, the aroma component testing results are shown in Tables 7-8, and the paste core testing results are shown in Figures 3-4 and Table 9.

[0091] Table 6: Sensory evaluation results of the extracts from Example 2 and Comparative Example 2

[0092] Table 7: Number and total content of aroma components in the extracts of Example 2 and Comparative Example 2

[0093] Table 8: Content (μg / g) of key aroma components in the extracts of Example 2 and Comparative Example 2

[0094] Table 9: Paste core test results of the extracts from Example 2 and Comparative Example 2

[0095] The test results above show that, compared to the refined tobacco extract obtained by alcohol precipitation in Comparative Example 2, the extract prepared using the method disclosed herein has a fuller tobacco aroma, stronger smoky flavor, and greater strength. Component analysis identified 13 aroma components unique to pyrolysis tobacco: bread ketone, 2-methylpyrazine, 3-furfural, 2,3-dimethylpyrazine, 2(5H)-furanone, 5-methylfurfural, methylcyclopentenolone, mesmin, geraniol acetone, ambroxol, farnesylacetone, damascene, and β-turatone. These substances are mainly produced by the pyrolysis of sugars, proteins, and alkaloids, and the resulting pyrolysis products in the tobacco effectively increase the fullness, aroma, and strength of the smoke. The core-paste test results show that the extract prepared using the microwave pyrolysis method disclosed herein significantly reduces core-paste and carbon buildup compared to Comparative Example 2.

[0096] The above description is merely a preferred embodiment of this disclosure and does not limit the patent scope of this disclosure. Any equivalent structural transformations made using the contents of this specification and drawings under the inventive concept of this disclosure, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this disclosure.

Claims

1. A method for preparing an extract, wherein, The method includes the following steps: Tobacco raw materials are subjected to microwave pyrolysis in a flowing gas. The microwave pyrolysis includes heating to a set microwave pyrolysis temperature and holding at the set microwave pyrolysis temperature. The set microwave pyrolysis temperature is 100℃-600℃, the heating time is 10min-60min, and the holding time is 10min-60min. The gaseous pyrolysis products are collected in at least one gas collection device at a temperature below 0℃ by the flowing gas. The collected liquids in the at least one gas absorption device are combined to obtain the extract, which includes 2-methylpyrazine, 2(5H)-furanone, 2,3-dimethylpyrazine, and methylcyclopentenolone.

2. The preparation method according to claim 1, wherein, The gas includes one or more of air, oxygen, or an inert gas.

3. The preparation method according to claim 1 or 2, wherein, The gas flow rate is 100 mL / min - 200 mL / min.

4. The preparation method according to claim 1 or 2, wherein, The temperature of the gas collection device is below 0°C, preferably -5°C to -20°C.

5. The preparation method according to claim 1 or 2, wherein, The preparation method further includes filtering the combined collected liquid to obtain the extract.

6. The preparation method according to claim 1 or 2, wherein, The tobacco raw materials include one or more of tobacco leaves, tobacco stems, and tobacco extracts.

7. The extract prepared by any one of claims 1-6.

8. The extract according to claim 7, wherein, The extract includes 2-methylpyrazine, 3-methylfuran, 2(5H)-furanone, γ-butyrolactone, 2,3-dimethylpyrazine, 3-methylvaleric acid, methylcyclopentenolone, benzyl alcohol, furanone, isomaltol, maltol, phenethyl alcohol, 4-oxoisoflurone, 4-hydroxy-β-dihydrodamascone, guaiacol; or The extract includes bread ketone, 2-methylpyrazine, 3-furfural, 2,3-dimethylpyrazine, 2(5H)-furanone, 5-methylfurfural, methylcyclopentenolone, mesmin, geraniol acetone, ambroxol, farnesylacetone, damascene, and β-turfatone.

9. An atomizing fluid, wherein, The extract includes the extract prepared by the preparation method according to any one of claims 1-6 or the extract according to claim 7 or 8, wherein the content of the extract is 0.01%-5% based on the total weight of the atomizing liquid.

10. An atomizing device, wherein, Includes the atomizing liquid as described in claim 9.

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