WO2022194051A1 - Tobacco flavoring, preparation method therefor, and use thereof - Google Patents

Abstract

Disclosed is a tobacco flavoring, a preparation method therefor, and a use thereof. The present invention provides a tobacco flavoring. The tobacco flavoring comprises a solid acid and an aroma precursor, wherein the weight ratio of the solid acid to the aroma precursor is 1:1-1:500. In the tobacco flavoring of the present invention, the solid acid serves as a catalyst and can make the temperature of thermal decomposition of the aroma precursor obviously decreased, and the aroma precursor can be effectively thermally decomposed to release aroma. The tobacco flavoring of the present invention is particularly suitable for a low-temperature cigarette, because in a room-temperature status, a flavoring substance does not volatilize and dissipate and then even if the low-temperature cigarette is stored for a long time, during smoking, aroma is still persistent and stable. According to the tobacco flavoring of the present invention, during smoking, rich and full aroma can be achieved, and thus the smoking quality and the consumption experience are improved. The solid acid in the present invention has no safety problem, off-flavor problem, etc. and does not change the properties and use effect of the flavoring itself; and the solid acid is low in price, easy to obtain, and high in safety.

Description

A kind of tobacco flavor and its preparation method and application technical field

The present invention relates to the technical field of heated cigarette flavors, in particular, the present invention relates to a tobacco flavor and a preparation method and application thereof.

Background technique

Tobacco (flavor) flavors in cigarettes have the functions of enriching tobacco flavor, improving smoking quality, highlighting and forming cigarette style, and are one of the core technologies of cigarettes. For traditional cigarettes, the most common method is to apply flavors and fragrances to cigarette cut tobacco. During the smoking process, the flavor components enter the consumer's mouth through volatilization, distillation, pyrolysis, cracking, etc., to enhance the smoking experience. Low temperature cigarettes, also known as heat-not-burn cigarettes cigarette), the tobacco material is heated by an external heat source, and the atomization medium, aroma components and external aroma in the tobacco material generate smoke similar to traditional cigarette smoking through heating, so that consumers can obtain physiological satisfaction. Since the tobacco substances in low-temperature cigarettes are only heated but not burned, the heating temperature (200-350°C) is much lower than the combustion temperature (800-900°C) of traditional cigarettes. Therefore, the harmful components and biological toxicity of smoke are greatly reduced. Flow flue gas and ambient flue gas are also greatly reduced.

The aroma precursors in tobacco refer to a class of substances that have no aroma and aroma under normal temperature conditions, but can decompose and release aroma components under heating or high temperature conditions. The aroma precursor well overcomes the shortcomings of the traditional tobacco flavor that the aroma is volatilized quickly and not lastingly, and can not lose the aroma during storage, and can release the aroma stably and lastingly during use.

technical problem

For some aroma precursors, the thermal decomposition temperature is 250-400°C or even higher. For traditional cigarettes, due to their higher combustion temperature (800-900°C), these high-boiling aroma precursors can be fully thermally decomposed to release aroma; while for low-temperature cigarettes, the heating temperature (200-350°C) is relatively high. Low, resulting in insufficient pyrolysis of many high-boiling aroma precursors, and can not effectively pyrolyze to release aroma.

Therefore, reducing the thermal decomposition temperature of aroma precursors so that they can be more fully thermally decomposed to release aroma and better function in low-temperature cigarettes has become a new problem.

technical solutions

In order to overcome the above-mentioned deficiencies of the prior art, the purpose of the present invention is to provide a tobacco flavor and its preparation method and application.

The object of the present invention is to solve the problems that traditional flavor substances in low-temperature cigarettes are easy to volatilize during processing and storage, and under heating conditions, the flavors volatilize rapidly, the aroma is quickly lost, the aroma is not persistent, and the aroma is not uniform during the smoking process. Provided is a novel tobacco flavor, the solid acid in the tobacco flavor can catalyze the cracking of aroma precursors at a lower temperature, release aroma stably and lastingly, and increase tobacco flavor, so it is more suitable for use as low-temperature cigarettes fragrance substances.

Solid acid is an important class of acid-base catalysts, and its catalytic function originates from the catalytically active acidic sites on the solid surface, also known as acid centers. Most solid acids are oxides or mixed oxides of non-transition elements. The acid strength of solid acid is very high, such as Al2O3-SiO2, Al2O3-B2O3, etc. all have strong acidity, and its acid strength is equivalent to the acid strength of sulfuric acid aqueous solution with a concentration of more than 90%.

The acid center has a strong adsorption effect on the electron cloud. The polar bonds in organic molecules, such as C-O, C-N, C-S, C-P, etc., have high electron cloud density in N, O, S, and P atoms with strong electronegativity due to the difference in electronegativity. The acid center will selectively attack N, O, S and P atoms, resulting in the cleavage of C-O, C-N, C-S, C-P bonds, showing selective catalysis. Rearrangement, condensation and other reactions occur between them, resulting in rearrangement and condensation products. Under the action of the solid acid center, the cracking reaction, rearrangement and condensation reaction will be accelerated by catalysis.

According to the above mechanism, theoretically, as long as there is an acid center, the cleavage of C-O, C-N, C-S, and C-P bonds can be catalyzed under suitable conditions. However, for tobacco, conventional inorganic acids (such as sulfuric acid, hydrochloric acid, nitric acid, phosphoric acid, etc.) and organic acids (such as acetic acid, lactic acid, citric acid, malic acid) are not suitable to be used directly as catalysts. On the one hand, due to food safety issues, some acids (such as sulfuric acid, hydrochloric acid, nitric acid, etc.) are not allowed to be used in tobacco; There can be acid centers, which can catalyze the cleavage of C-O, C-N, C-S, and C-P bonds. After adding and using these acids, the properties and use effects of the fragrance itself are changed (such as pH value, aroma, fragrance, etc.) . Therefore, it is difficult for conventional inorganic acids and organic acids to only provide acid centers and act as catalysts to catalyze the cleavage of C-O, C-N, C-S, and C-P bonds. The solid acid is different, it is safe, tasteless, and is allowed to be used in food. The acid sites of the L acid and the B acid of the solid acid are on the solid, which can play a catalytic role only by contacting with the flavor for tobacco, without problems such as safety and peculiar smell, and does not change the properties and use effects of the flavor itself.

In order to solve the above problems, the present invention adopts the following technical solutions:

The present invention provides a flavor for tobacco, which contains a solid acid and an aroma precursor, wherein the weight ratio of the solid acid and the aroma precursor is 1:1 to 1:500.

Preferably, the solid acid includes treating at least one of porous silicates, metal oxides and their mineral salts, heteropolyacids, and polymeric organic acids.

Preferably, the porous silicates in the treated porous silicates include natural silicates, such as diatomite, montmorillonite, bentonite, kaolin, and synthetic porous silicates; the treatment methods include metal doping (aluminum, iron, zirconium, vanadium, etc.) and acid treatment (sulfuric acid treatment, phosphoric acid treatment, etc.).

Preferably, the metal oxides and their mineral salts are one or more mixtures of metal oxides with acid centers, sulfates or phosphates of metal oxides, including commonly used metal oxides with acid centers, Such as zirconium oxide, niobium oxide, aluminum oxide, etc., and one or more mixtures of sulfate and phosphate.

Preferably, the heteropolyacid includes any one of tungstic acid, molybdic acid, and vanadic acid containing a heteroatom, and the heteroatom is any one of phosphorus, silicon, iron, and cobalt. For example, the heteropolyacid can be tungstic acid, molybdic acid, vanadic acid, etc. including phosphorus, silicon, iron, cobalt, such as phosphotungstic acid, phosphomolybdic acid, silicotungstic acid, ferrotungstic acid, ferromolybdic acid, etc. .

Preferably, the polymeric organic acid includes, but is not limited to, sulfonated polystyrene resin, sulfonated polytetrafluoroethylene, and the like.

Preferably, the aroma precursor is a substance allowed to be used in tobacco flavors and contains one or more C-O, C-N, C-S, C-P bonds.

On the other hand, the present invention also provides a preparation method for preparing the above-mentioned tobacco flavor, the preparation method comprising contacting the solid acid and the aroma precursor.

Preferably, the contacting is carried out by grinding and mixing the solid acid and the aroma precursor in a solid state; and/or by immersing the solid acid in the aroma precursor solution.

On the other hand, the present invention also provides the use of the above-mentioned tobacco flavor as a flavor substance in low-temperature cigarettes.

beneficial effect

Compared with the prior art, the technical effect of the present invention is embodied in:

(1) In the tobacco flavor of the present invention, the solid acid acts as a catalyst, which can significantly reduce the thermal decomposition temperature of the aroma precursor, and the aroma precursor can be effectively thermally decomposed to release the aroma; (2) The tobacco of the present invention Fragrance is especially suitable for low-temperature cigarettes. Under normal temperature, the fragrance substance does not volatilize and does not dissipate. Even if the low-temperature cigarette is stored for a long time, the aroma is still lasting and stable during smoking; (3) The tobacco flavor of the present invention is used for smoking. When sucking, the aroma is rich and full, which improves the quality of suction and consumption experience; (4) the solid acid of the present invention has no problems such as safety and peculiar smell, and does not change the properties and use effects of the fragrance itself; (5) the solid acid is cheap, It is easy to obtain and has high safety; (6) the tobacco flavor of the present invention can be obtained by simply contacting the solid acid and the aroma precursor, such as mixing or solution adsorption, and the process is simple but the effect is good.

Additional advantages, objects, and features of the present invention will be set forth in part in the description that follows, and in part will become apparent to those of ordinary skill in the art upon study of the following, or may be learned from practice of the invention.

Those skilled in the art will appreciate that the objects and advantages that can be achieved with the present invention are not limited to those specifically described above, and that the above and other objects that can be achieved by the present invention will be more clearly understood from the following detailed description.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the specification, and together with the following specific embodiments, are used to explain the present invention, but do not constitute a limitation to the present invention. In the attached image:

Fig. 1 shows the DSC-TG-DTG spectrum of pure geraniol glucoside in Example 1, wherein the test atmosphere is air;

Fig. 2 shows the DSC-TG-DTG spectrum of geraniol glucoside+5% solid acid according to the present invention in Example 1, wherein the test atmosphere is air;

Fig. 3 shows the DSC-TG-DTG spectrum of the Maillard reaction intermediate obtained by the basic method in Example 2, wherein the test atmosphere is air;

Figure 4 shows the DSC-TG-DTG spectrum of the Maillard reaction intermediate+10% solid acid obtained by the alkaline method in Example 2, wherein the test atmosphere is air.

Embodiments of the present invention

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

The endpoints of ranges and any values disclosed herein are not limited to the precise ranges or values, which are to be understood to encompass values proximate to those ranges or values. For ranges of values, the endpoints of each range, the endpoints of each range and the individual point values, and the individual point values can be combined with each other to yield one or more new ranges of values that Ranges should be considered as specifically disclosed herein.

Before describing the present invention in detail, it is to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the invention, which is defined solely by the appended claims. For a more complete understanding of the invention described herein, the following terms are employed, the definitions of which are shown below. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as understood by one of ordinary skill in the art to which this invention belongs.

In one aspect, the present invention provides a tobacco flavor, the tobacco flavor comprising a solid acid and an aroma precursor, wherein the weight ratio of the solid acid and the aroma precursor is 1:1 to 1:500.

According to the present invention, the weight ratio of solid acid and aroma precursor in tobacco flavor can be further selected in the range of 1:1 to 1:500, for example, the weight ratio of solid acid and aroma precursor can be 1: 10, 1:20, 1:50, 1:100, 1:200 or 1:300, etc., but not limited thereto.

According to the present invention, the types of solid acids and aroma precursors are not particularly limited, and can be common types of solid acids and aroma precursors. For example, the solid acid may be at least one of materials such as treated porous silicates, metal oxides and their mineral salts, heteropolyacids, polymeric organic acids. In a preferred embodiment of the present invention, the solid acid may be a metal oxide-based solid acid or a mineral salt-based solid acid of a metal oxide. Metal oxides and their mineral salts include commonly used metal oxides with acid centers, such as zirconium oxide, niobium oxide, aluminum oxide, etc., and one or more mixtures of sulfate and phosphate. Further, in a preferred embodiment of the present invention, the metal oxide-based solid acid may be selected from the group consisting of Al2O3-SiO2-based mixed oxides, Al2O3-B2O3-based mixed oxides, and ZrO2-MoO3-based mixed oxides. One or more; the mineral salt solid acid of metal oxide can be selected from one or more of metal sulfate and metal phosphate. Further, the metal in the metal oxide may be, for example, Fe, Al, Cu, or the like. Further, the solid acid used in the present invention can be more specifically aNa2O:bAl2O3:cSiO2, where a<0.1%, b/c≈1/25 (or 1/10-1/30, etc.) , generally can be fired from alumina and silicon oxide in a certain molar ratio, in which sodium oxide is an impurity, so control its content is not high.

According to the catalytic principle of the present invention, the solid acid can also be used to treat porous silicates, and porous silicates include natural silicates, such as diatomite, montmorillonite, bentonite, kaolin, and synthetic porous silicates; the treatment methods include Metal doping (aluminum, iron, zirconium, vanadium, etc.) and acid treatment (sulfuric acid treatment, phosphoric acid treatment, etc.). The solid acid can also be a heteropolyacid, and the heteropolyacid can be any one of tungstic acid, molybdic acid, and vanadic acid containing heteroatoms, and the heteroatom is any one of phosphorus, silicon, iron, and cobalt. For example, the heteropolyacid may be tungstic acid, molybdic acid, vanadic acid, etc. including phosphorus, silicon, iron, cobalt, such as phosphotungstic acid, phosphomolybdic acid, silicotungstic acid, ferrotungstic acid, ferromolybdic acid, and the like. The solid acid may also be a polymeric organic acid, including but not limited to sulfonated polystyrene resin, sulfonated polytetrafluoroethylene, and the like.

According to the present invention, aroma precursors can be understood as substances allowed to be used in tobacco flavors and containing one or more C-O, C-N, C-S, C-P bonds. More generally speaking, in a preferred embodiment of the present invention, the aroma precursor can be a glycoside substance formed by the combination of aroma substances and sugar substances through glycosidic bonds; in another preferred embodiment of the present invention, Aroma precursors can be Maillard reaction intermediates obtained by incomplete Maillard reaction of carbonyl compounds (such as reducing sugars) and amino compounds (such as amino acids and proteins) at a certain temperature.

On the other hand, the present invention also provides a preparation method for preparing the above-mentioned tobacco flavor, the preparation method comprising contacting the solid acid and the aroma precursor.

In the preparation method provided by the present invention, the contacting of the solid acid and the aroma precursor can be carried out in any manner, for example, it can be mixed in a solid phase, a liquid phase or a combination thereof. In a preferred embodiment of the present invention, the contacting may be performed by grinding and mixing the solid acid and the solid aroma precursor; and/or may be performed by dipping the solid acid in the aroma precursor solution.

When the contacting is performed by grinding and mixing the solid acid and the solid aroma precursor, the mixing ratio of the solid acid and the solid aroma precursor may be 1:1 to 1:500 (weight ratio). When the contacting is carried out by immersing the solid acid in the aroma precursor solution, the aroma precursor solution may be water, ethanol, propylene glycol, glycerin, and ethanol having a concentration of 5 to 70% (weight ratio) of the aroma precursor. alcohol solution or a combination thereof, and the contacting may further include low-temperature baking or air-drying after the solid acid is immersed in the solution for 2-24 hours.

On the other hand, the present invention also provides the use of the above-mentioned tobacco flavor as a flavor substance in low-temperature cigarettes.

According to the various methods for preparing the tobacco flavor of the present invention, the tobacco flavor of the present invention can be used as the flavor material in low-temperature cigarettes in corresponding different ways. For example, the tobacco flavor solids of the present invention can be uniformly mixed with tobacco powder to prepare tobacco flakes, and the tobacco flakes and the cooling tip rod are connected by tipping paper to form low-temperature cigarette cigarettes; the tobacco flavors of the present invention are formulated into water, ethanol, propylene glycol, glycerin solution or a combination thereof, and then uniformly mixed with tobacco powder to prepare tobacco sheet shreds, and the tobacco sheet shreds and the cooling tip rod are connected by tipping paper to form low-temperature cigarettes; The tobacco flavor is prepared into water, ethanol, propylene glycol, glycerin solution or a combination thereof, which is uniformly applied to the surface of the tobacco sheet, and the tobacco sheet is connected with the cooling tip rod through tipping paper to form a low-temperature cigarette.

The inventors have found through research that in the tobacco flavor of the present invention, the solid acid can be used as a catalyst, which can significantly reduce the thermal decomposition temperature of the aroma precursor, so it is especially suitable for low-temperature cigarettes. Non-volatile and non-volatile, even if the low-temperature cigarettes are stored for a long time, the aroma is still lasting and stable during smoking.

Hereinafter, the effects of the specific tobacco flavor of the present invention will be described in detail by way of examples.

Example

Example 1

Add 5% (weight ratio) solid acid to geraniol glucoside (the chemical composition of the solid acid used in the embodiment is expressed as the molar ratio of oxides: aNa2O:bAl2O3:cSiO2, where a<0.1%, b/c=1/25), and mix well to obtain a mixture.

The resulting mixture and pure geraniol glucoside were put into a CDS 5250T pyrolyzer for lysis and analysis, respectively. The sample cells used in the cracking test were all stainless steel high-pressure crucibles with gold-plated gaskets, with a capacity of 30 μL and a maximum pressure resistance of 15 MPa. The reference crucibles were all made of high-pressure stainless steel crucibles of the same material. The heating rate (β) of the dynamic DSC test was 10°C/min, the test temperature range was 30-800°C, and the sample mass (m) was 3.5 ± 0.05 mg. Comparative analysis of Figure 1 and Figure 2 (showing the DSC-TG-DTG spectra of pure geraniol glucoside and geraniol glucoside + 5% solid acid respectively) according to the present invention, it can be seen that pure geraniol glucoside The weight loss peaks of alcohol glucoside DTG curve were at 239°C and 333°C, respectively, while the DTG weight loss peaks decreased to 219°C and 260°C after adding solid acid. This shows that the addition of the solid acid greatly reduces the thermal cracking temperature of geraniol glucoside.

After the mixture solid of the solid acid of geraniol glucoside+5% (weight ratio) and the tobacco powder are uniformly mixed according to the weight ratio of 1:500, the tobacco sheet wire is prepared, and the tobacco sheet wire and the cooling nozzle stick are connected by tipping paper , form low-temperature cigarette cigarettes; in addition, the solid geraniol glucoside and tobacco powder are uniformly mixed according to the weight ratio of 0.95:500 to prepare tobacco sheet shreds, and the tobacco sheet shreds and the cooling nozzle stick are connected by tipping paper to form a control cigarette . The smoking evaluation results show that, compared with the control cigarettes, the low-temperature cigarette of the present invention has the advantages of clear fragrance and roasted sweet fragrance, the fragrance is obviously full and elegant, and the smoking satisfaction is strong.

Example 2

Synthesis of basic famaillard reaction intermediate: mix L-glycine and glucose in a 1:1 molar ratio, add 5 times the amount (ratio to the total weight of L-glycine and glucose) of ethylene glycol solvent, and Add 10% (ratio to the total weight of L-glycine and glucose) NaOH catalyst, and react at 130 ° C for 6 hours. Then add 2.5 times the amount (ratio to the total weight of L-glycine and glucose) of deionized water to dissolve, and then adjust the pH to neutrality with 1.0mol/L HCl solution. The above-mentioned neutral Maillard reaction intermediate aqueous solution is separated by using different molecular weight cut-off membrane modules. The Maillard reaction intermediate solution is collected according to the molecular weight cut-off of the membrane module (>5000kDa, 500~5000kDa, 0~500kDa), and the Maillard reaction intermediate solution of 500~5000kDa is collected. The Maillard reaction intermediate solution was concentrated by a rotary evaporator until crystals appeared, and then a small amount of deionized water was added to dissolve to form a solution. The solution was frozen and freeze-dried (72h, 0.000001Pa, -78°C) to give a solid Maillard reaction intermediate.

Add 10% (weight ratio) of solid acid to the Maillard reaction intermediate prepared as above (the chemical composition of the solid acid used in the embodiment is expressed by the molar ratio of oxides: aNa2O:bAl2O3:cSiO2, in the formula a<0.1%, b/c=1/25), and mix well to obtain a mixture.

The resulting mixture and individual Maillard reaction intermediates were put into a CDS 5250T pyrolyzer for cracking and analysis, respectively. The sample cells used in the cracking test were all stainless steel high-pressure crucibles with gold-plated gaskets, with a capacity of 30 μL and a maximum pressure resistance of 15 MPa. The reference crucibles were all made of high-pressure stainless steel crucibles of the same material. The heating rate (β) of the dynamic DSC test was 10°C/min, the test temperature range was 30-800°C, and the sample mass (m) was 3.5 ± 0.05 mg. Comparative analysis of Figure 1 and Figure 2 (showing the DSC-TG-DTG spectrum of the Maillard reaction intermediate alone and the Maillard reaction intermediate according to the present invention + 10% solid acid, respectively) can be seen that glucose-glycine When the Maillard reaction intermediate produces an endothermic peak (142 °C), thermal weight loss occurs, which indicates that the endothermic process is not a phase transition, but an endothermic pyrolysis process, and the sample is a compound without melting point. After the addition of solid acid, the endothermic peak decreased (105 °C), and the thermal weight loss peak decreased from 144 °C to 136 °C. This shows that the addition of solid acid under the air atmosphere obviously catalyzes the pyrolysis of the Maillard reaction intermediate.

Thermal cracking experiments were performed on the Maillard reaction intermediate alone and the Maillard reaction intermediate + 10% solid acid, respectively. Pyrolysis and analysis were performed using a CDS 5250T pyrolyzer and an Agilent 7890A-5975C GC/MS. Weigh about 1 mg of the sample, put it on the quartz wool in the lysis tube, and then put the lysis tube on the lysis instrument to be lysed. Pyrolysis heating program: the initial temperature was 50 °C, and the temperature was increased to the set pyrolysis temperature (350 °C) at 30 °C/s, and held for 5 s. The pyrolysis atmosphere is helium gas, the gas flow rate: 70 mL/min, the temperature of the valve box of the pyrolysis apparatus: 280 °C, and the temperature of the transmission line of the pyrolysis apparatus: 280 °C. GC-MS method: elastic quartz capillary column; stationary phase is 5% phenyl-95% methyl polysiloxane; specification is [30m (length) × 0.25mm (inner diameter) × 0.25μm (film thickness)]; Air flow, 1.0mL/min; split ratio, 100:1; heating program, initial temperature 40°C, hold for 3min, rise to 240°C at a rate of 10°C/min, and then rise to 280°C at a rate of 20°C/min , maintained for 15min; mass spectrometry transmission line temperature 280 ℃; ion source temperature 230 ℃; quadrupole temperature 150 ℃; mass scanning range 29-450amu. The results of the cleavage products are shown in Table 1 below:

From the results in Table 1, it can be clearly seen that under the condition of 350°C (close to the heat source temperature of general heating cigarette heating appliances), in the cleavage product of the Maillard reaction intermediate of glucose and glycine, furan ring substances accounted for 8.884%; In the cleavage product of the Maillard reaction intermediate of glucose and glycine added with solid acid, furan ring substances accounted for 37.919%, which was more than 4 times that without solid acid. It can be seen that under the condition of 350°C (close to the heat source temperature of general heating cigarette heating appliances), the addition of solid acid can make the intermediates of the Maillard reaction between glucose and glycine directionally generate furan rings.

After the mixed solid of the Maillard reaction intermediate+10% (weight ratio) obtained as above is uniformly mixed with the tobacco powder according to the weight ratio of 1:400, it is prepared into tobacco flakes, tobacco flakes and cooling nozzle rods Connect by tipping paper to form low-temperature cigarette cigarettes; in addition, the Maillard reaction intermediate solid and tobacco powder are uniformly mixed according to a weight ratio of 0.9:400 to prepare shredded tobacco, and the shredded tobacco and the cooling nozzle rod pass through the tipping paper connected to form control cigarettes. The smoking evaluation results show that, compared with the control cigarettes, the low-temperature cigarette of the present invention has the advantages of clear fragrance and roasted sweet fragrance, the fragrance is obviously full and elegant, and the smoking satisfaction is strong.

The preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the specific details of the above-mentioned embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solutions of the present invention. These simple modifications All belong to the protection scope of the present invention.

In addition, it should be noted that the specific technical features described in the above-mentioned specific embodiments can be combined in any suitable manner unless they are inconsistent. In order to avoid unnecessary repetition, the present invention provides The combination method will not be specified otherwise.

In addition, the various embodiments of the present invention can also be combined arbitrarily, as long as they do not violate the spirit of the present invention, they should also be regarded as the contents disclosed in the present invention.

The present invention is not limited to the above-mentioned specific embodiments, and various modifications and variations of the present invention are possible. Any modification, equivalent replacement, improvement, etc. made to the above embodiments according to the technical essence of the present invention shall be included within the protection scope of the present invention.

Claims (10)

A tobacco flavor, characterized in that the tobacco flavor comprises a solid acid and an aroma precursor, wherein the weight ratio of the solid acid and the aroma precursor is 1:1 to 1:500. A tobacco flavor according to claim 1, characterized in that, the solid acid is at least one of treated porous silicates, metal oxides and their mineral salts, heteropolyacids, and polymeric organic acids. The tobacco flavor according to claim 2, wherein the porous silicates in the treated porous silicates include natural silicates and synthetic porous silicates; the treatment methods include metal doping and acid treatment . A kind of tobacco flavor according to claim 2, is characterized in that, described metal oxide and mineral salt thereof are one or more in metal oxide with acid center, sulfate or phosphate of metal oxide kind of mixture. A kind of tobacco flavor according to claim 2, it is characterized in that, described heteropolyacid is any one in tungstic acid, molybdic acid, vanadic acid containing heteroatom, and described heteroatom is phosphorus, silicon, Either iron or cobalt. The tobacco flavor according to claim 2, wherein the polymeric organic acid comprises sulfonated polystyrene resin and sulfonated polytetrafluoroethylene. The tobacco flavor according to claim 1, wherein the aroma precursor is a substance allowed to be used in tobacco flavor, and contains one or more C-O, C-N, C-S, C-P bonds. The preparation method of a tobacco flavor according to any one of claims 1 to 7, wherein the preparation method comprises contacting the solid acid with the aroma precursor. The method for preparing a tobacco flavor according to claim 8, wherein the contact is by grinding and mixing the solid acid and the solid aroma precursor; and/or by mixing the solid acid It is carried out by dipping in the aroma precursor solution. The purposes of a kind of tobacco flavor as claimed in any one of claims 1 to 7 as flavor substances in low-temperature cigarettes.