KR20220157143A - A tobacco materials and aerosol-generating article comprising the same - Google Patents

Abstract

The present invention relates to a tobacco medium and an aerosol generating article comprising the same, and more specifically to the tobacco medium used in a non-combustion aerosol generating article. According to the present invention, the tobacco medium includes a pulverized tobacco material and a pH adjusting agent. The pulverized tobacco material is included as at least 70 % by weight of the tobacco medium on a dry weight basis and the pulverized tobacco material includes at least 4.0 % nicotine by weight on a dry weight basis. In addition, the tobacco medium includes at least 2.8 % nicotine by weight on a dry weight basis and pH of the tobacco medium is between 6 and 9. Accordingly, nicotine delivery can be increased even at low temperature and low pH.

Description

A tobacco material and aerosol-generating article comprising the same}

Tobacco media comprising tobacco material, and aerosol generating articles comprising such tobacco media.

Combustion tobacco, which is lit and smoked like a conventional cigarette, is a method of heating tobacco leaves at a temperature of about 800 to 850 ° C., whereas heat-not-burn tobacco is a relatively low temperature, for example In the case of a heated cigarette, a temperature of about 280 to 350 ° C. is applied to the device to generate an aerosol.

Non-combustion cigarettes can be distinguished into heated cigarettes and non-heated cigarettes, and in both non-heated cigarettes and heated cigarettes, it is important to facilitate nicotine transfer at a lower temperature. Specifically, in the case of non-heated cigarettes, nicotine must be smoothly transferred without applying temperature, and even in the case of heated cigarettes, nicotine can be smoothly transferred at a lower temperature to minimize device size and battery consumption. There should be.

Accordingly, there are a number of conventional techniques for providing alkalinized tobacco raw materials in order to facilitate nicotine transfer under low heating temperature or non-heating conditions. Since nicotine in tobacco material exists in a salt state and is difficult to vaporize at low temperatures, it is alkalized to provide it to users in the form of free-base nicotine.

However, there is a problem in that the occurrence of off-flavors increases as the tobacco raw material is alkalized, and the storability of nicotine in the raw material is reduced due to volatilization of the free base nicotine converted to alkalinization.

KR 10-1851091 B

Embodiments of the present invention aim to provide a tobacco medium capable of increasing the delivery of nicotine even at low temperature and low pH.

Problems to be solved in the embodiments are not limited thereto, and it will be said that solutions to problems described below or objectives or effects that can be grasped from the embodiments are also included.

Tobacco medium according to an embodiment of the present invention is a tobacco medium comprising pulverized tobacco material and a pH adjusting agent, wherein the pulverized tobacco material comprises at least 70% by weight of the tobacco medium on a dry weight basis, and the pulverized tobacco medium wherein the tobacco material comprises at least 4.0% nicotine on a dry weight basis, wherein the tobacco medium comprises at least 2.8% nicotine on a dry weight basis, and the pH of the tobacco medium is between 6 and 9. It is about.

As an embodiment of the invention, the tobacco medium may be filled into a non-combustion aerosol generating article.

As an embodiment of the present invention, the heating temperature of the article may be 30 to 180 ℃.

As an embodiment of the present invention, the tobacco medium may be prepared in sheet or granular form.

As an embodiment of the present invention, the granular form may be a form including a core and a shell surrounding the core.

As an embodiment of the present invention, the above-described tobacco medium may additionally include a coating layer on the outside of the platelet or the granular form.

As an embodiment of the present invention, the above-mentioned tobacco medium comprises the above-mentioned coating layer, and the coating layer may be characterized in that it has pores.

In one embodiment of the invention, comprising pulverized tobacco material and a pH adjusting agent, wherein the pulverized tobacco material comprises at least 70% by weight of the tobacco medium on a dry weight basis, wherein the pulverized tobacco material comprises: An aerosol-generating article comprising a tobacco medium comprising at least 4.0% nicotine by weight, wherein the tobacco medium comprises at least 2.8% nicotine on a dry weight basis, and wherein the tobacco medium has a pH of 6 to 9. It is about.

As an embodiment of the invention, the aerosol-generating article may be characterized in that it is non-combustible.

As an example, the aerosol-generating article may be characterized in that the heating temperature of the article is between 30 and 180 °C.

According to an embodiment of the present invention, a tobacco medium capable of facilitating the transition of nicotine, reducing off-flavors caused by alkalinization, and reducing the rate of loss of nicotine during storage even at a relatively low temperature and low pH without supplementation of additional nicotine salt. can provide.

1 is a view for explaining an aerosol-generating article according to an embodiment of the present invention.
Figure 2 schematically shows an embodiment of the case where the tobacco medium according to an embodiment of the present invention is a core-shell structured granular medium.

Hereinafter, the present invention will be described in detail so that those skilled in the art can easily practice it with reference to the accompanying technology. However, it will be apparent to those skilled in the art that the present invention can be implemented in many different forms and is not limited to the examples described below.

Terms used in this application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, the terms "include" or "have" are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in the present application, they should not be interpreted in an ideal or excessively formal meaning. don't

In addition, the accompanying drawings in this application are intended to embody the present invention and are not intended to limit or limit the scope of rights, of course. What can be easily inferred by an expert in the art from the drawings and the detailed description below is interpreted as belonging to the scope of rights.

In one embodiment, the present invention relates to a tobacco medium incorporated in an aerosol-generating article, and specifically relates to a tobacco medium incorporated in a non-combustion aerosol-generating article.

In the present invention, a "non-combustion aerosol-generating article" may refer to a non-combustion cigarette or non-combustion tobacco article that indirectly heats with electrical energy rather than direct combustion. By way of example, the non-combustible aerosol-generating article may be non-heated or heated.

As an example, the heated aerosol-generating article may be an article that generates an aerosol by sucking in ambient air heated through electrical energy, and emits the aerosol after being inhaled by the user to enable smoking. In general, an aerosol-generating article may include a media portion and a filter portion, and the media portion may include tobacco media.

As an example, the non-combustion type aerosol-generating article of the present invention may be characterized in that the heating temperature of the article, that is, the heating temperature applied by the device, may be 30 to 180 ° C, and provides sufficient nicotine without off-flavor even at such a low temperature. can

1 is a view for explaining an aerosol-generating article according to an embodiment of the present invention.

Referring to FIG. 1 , an aerosol-generating article 100 may include a tobacco rod 110 and a filter rod 120 .

As an example, the filter rod 120 may be composed of a plurality of segments. Although shown as a single segment in Figure 1, it is not limited thereto. For example, the filter rod 120 may include a first segment for cooling the aerosol and a second segment for filtering a predetermined component included in the aerosol. If necessary, the filter rod 120 may have other functions. It may additionally include at least one segment to perform.

As an example, the tobacco rod 110 and filter rod 120 may be wrapped by one or more wrappers 130. At least one hole through which external air is introduced or internal gas is discharged may be formed in the wrapper 130 . As another example, when two or more wrappers 130 are used, the tobacco rod 110 may be wrapped by a first wrapper and the filter rod 120 may be wrapped by a second wrapper. Then, the tobacco rod 110 and the filter rod 120 wrapped by each wrapper are combined, and the entire cigarette can be repackaged by the third wrapper. As another example, as described above, if the filter rod 120 is composed of a plurality of segments, each segment may be wrapped by a respective wrapper. In addition, the entire cigarette in which segments wrapped by individual wrappers are combined may be repackaged by another wrapper.

In the present invention, "tobacco medium" is an aerosol-forming material that releases volatile compounds when heated, and typically includes nicotine-containing tobacco materials such as leaf tobacco, and may additionally include excipients such as binders and other additives.

As an example, a tobacco medium of the present invention may include comminuted tobacco material and a pH adjusting agent.

In the present invention, "tobacco medium" is an aerosol-forming material that releases volatile compounds when heated, and typically includes nicotine-containing tobacco materials such as leaf tobacco, and may additionally include excipients such as pH adjusters, binders, and other additives. can As an example, the tobacco medium of the present invention may be prepared in the form of granules or leaflets containing tobacco substances and excipients.

In the present invention, "tobacco material" is a material forming an aerosol-generating substrate, which may be tobacco leaf pieces, tobacco stems, tobacco dust generated during tobacco processing and/or major lateral strips of tobacco leaves. Tobacco leaves may be at least one selected from yellow species, burley species, orient species, cigar leaves, and toast, but are not limited thereto.

In the present invention, the "pH adjusting agent" can be used to alkalinize nicotine in a salt state present in tobacco material and convert it to free base nicotine. Since it is difficult to vaporize or aerosolize at a low temperature in the nicotine salt state, it can be converted into a free base nicotine form by alkalinizing it through a pH adjusting agent and delivered to the user.

In one embodiment, a tobacco medium of the present invention is a tobacco medium comprising pulverized tobacco material and a pH adjusting agent, wherein the pulverized tobacco material comprises at least 70% by weight of the tobacco medium on a dry weight basis, wherein the tobacco material comprises at least 4.0% nicotine on a dry weight basis, wherein the tobacco medium comprises at least 2.8% nicotine on a dry weight basis, and the pH of the tobacco medium is between 6 and 9. can be

In one embodiment, the tobacco medium of the present invention converts nicotine present in a salt state to freebase nicotine by alkalizing the tobacco material through a pH adjusting agent, thereby increasing the vapor pressure to deliver nicotine even under relatively low temperature conditions. You can make this run smoothly.

As an example, the present invention can increase the delivery of nicotine at relatively low temperatures by using the tobacco medium described above. The tobacco medium of the present invention may be filled in a noncombustion aerosol generating article, and the noncombustion aerosol generating article of the present invention may have a device heating temperature of 30 to 180 °C. The tobacco medium of the present invention can be characterized in that it can deliver a sufficient amount of nicotine while minimizing nicotine loss or off-flavor during storage, even when temperatures much lower than those of typical heated devices are applied.

Specifically, when using a tobacco material containing a relatively high nicotine content as in the present invention, a sufficient amount of prenicotine can be provided even at a relatively low temperature. Thus, the tobacco material of the present invention can be usefully used in non-heated aerosol-generating articles or heated aerosol-generating articles with a low heating temperature, and can promote device miniaturization and minimize battery consumption.

In addition, when using a tobacco material containing a relatively high nicotine content as in the present invention, a sufficient amount of prenicotine can be provided even at a relatively low pH. Therefore, by applying a relatively low pH, it is possible to reduce off-flavors generated during conversion to pre-nicotine and reduce nicotine loss during storage. For example, a sufficient amount of prenicotine can be provided even with a relatively small amount of pH adjusting agent.

In one embodiment, the tobacco medium of the present invention comprises at least 70%, preferably at least 75%, more preferably at least 80% by weight of pulverized tobacco material on a dry weight basis, and comprises a pH adjusting agent. An excipient may be included. If the content of the excipient is too high, including the tobacco material below the above-mentioned range, it may not provide a sufficient amount of nicotine to the user, which may cause problems.

In one embodiment, the pulverized tobacco material included in the tobacco medium of the present invention may contain greater than 4.0% nicotine by weight on a dry weight basis. In one embodiment, the pulverized tobacco material included in the tobacco medium of the present invention may contain a relatively high nicotine content, greater than or equal to 4.5% by weight on a dry weight basis, or greater than or equal to 5.0% by weight on a dry weight basis; or at least 5.5% by weight on a dry weight basis.

As an example also, the tobacco medium of the present invention may comprise greater than 2.8% nicotine by weight on a dry weight basis. As an example, the tobacco medium of the present invention may be at least 3.15%, or at least 3.5%, or at least 3.85% by weight on a dry weight basis.

As described above, the present invention can provide a high nicotine transfer amount compared to the amount of pH adjusting agent by using a tobacco material containing a relatively high nicotine content. In addition, even when using the same amount of pH adjuster, it shows a low pH, and even at a relatively low pH, the freebase nicotine content is high, so nicotine transfer is smooth, off-flavor is reduced, and the amount lost to the freebase nicotine during storage can be reduced.

As an example, the tobacco material of the present invention may be pulverized leaf tobacco of a species having a relatively high nicotine content, or may be pulverized leaf tobacco mixed with several species.

As an embodiment, the tobacco medium of the present invention comprising a pH adjusting agent may have a pH of 6 to 9, preferably 6 to 8, more preferably 6 to 7.

The tobacco medium of the present invention may be characterized in that it contains a tobacco material with a relatively high nicotine content, thereby enabling smooth nicotine transfer even at a neutral and relatively weak pH in the range described above.

As an example, the pH adjusting agent that can be used in the present invention can be used without limitation as long as it is a material known in the art, but alkali metal carbonate, alkaline earth metal carbonate, alkali metal hydrogen carbonate, alkaline earth metal hydrogen carbonate, alkali metal hydroxide At least one basic inorganic salt selected from the group consisting of alkaline earth metal hydroxides, alkali metal phosphates, alkaline earth metal phosphates, alkali metal phosphates, alkaline earth metal phosphates, alkali metal hydrogen phosphate monohydrogen salts, and alkaline earth metal hydrogen phosphate monohydrogen salts.

As an example, the tobacco medium of the present invention may be filled into a non-combustion aerosol generating article. The non-combustion aerosol-generating article may include a non-heated aerosol-generating article to which no temperature is applied and a heated aerosol-generating article to which a relatively low temperature is applied. As an example, the heated aerosol-generating article of the present invention may be an article to which a lower temperature is applied than a typical heated aerosol-generating article.

As an example, an aerosol-generating article of the present invention may have a heating temperature of the device of 30 to 180 °C. As an example, the temperature received by the medium during heating may be 100 to 180 °C, 150 to 180 °C, or 30 °C or higher.

The above-described tobacco medium of the present invention comprises pulverized tobacco material and a pH adjusting agent, wherein the pulverized tobacco material comprises at least 70% by weight of the tobacco medium on a dry weight basis, the pulverized tobacco material comprising: wherein the tobacco medium comprises at least 2.8% nicotine by weight on a dry weight basis, wherein the tobacco medium has a pH of 6 to 9; By including a tobacco material with a high nicotine content, it is possible to provide a smooth nicotine transition even at a relatively low temperature. Thus, the tobacco media of the present invention can be used in heated aerosol-generating articles and non-heated aerosol-generating articles as described above.

As an example, the above-described tobacco medium of the present invention is not limited in form, but may be produced in the form of reconstituent tobacco leaves or granules.

As one example, the platelet shape may mean a cut filler obtained by finely cutting a platelet sheet, and as another example, the platelet sheet may mean a plurality of tobacco strands in which the platelet sheet is cut.

For example, the platelet sheet is prepared by pulverizing tobacco raw materials such as tobacco leaf pieces, tobacco stems, and/or tobacco fines generated during tobacco processing to prepare a slurry in which aerosol generating substances, flavoring liquids, binders, water, etc. are mixed. , Tobacco strands can be produced by forming a platelet sheet using the slurry, and then cutting or slicing the dried platelet sheet. Meanwhile, when preparing the slurry, natural pulp or cellulose may be added, and one or more binders may be mixed and used.

As an example, the granular form may be composed of a single layer, or may be composed of a multilayer structure including a core and a shell surrounding the core. Specifically, the granule form of the core-shell structure may be composed of a “core” formed by spherical pulverized tobacco material and the like and a “shell” surrounding it, and the shell may be one or more multi-layered can

Figure 2 schematically shows an embodiment of the case where the tobacco medium according to an embodiment of the present invention is composed of a core-shell structured granular medium.

The granular tobacco medium 200 according to an embodiment of the present invention may have a dual structure composed of one core 210 and one shell 220, as shown in FIG. 2 (a), and FIG. 2 ( As shown in b), it may be a triple structure composed of a core 210 and two layers of shells 220 and 230, and as shown in FIG. 2 (c), the core 210 and three layers of shells ( 220, 230, 240) may have a triple structure or more, or may have a multiple structure of more than that.

As an example, the core-shell structure of the present invention can be manufactured by a method commonly used in the art. As an example, the core may be produced by spheronizing cut tobacco stock, preferably by an atomizing process such as spray chilling.

These cores can then be layered with powder to form a shell surrounding the core. Preferably, a core-shell structure may be formed by dispersing core particles in a material constituting a shell in a molten state.

In one embodiment, the tobacco medium of the present invention may additionally include a coating layer on the outside. As an example, as described above, the tobacco medium of the present invention may be prepared in the form of leaflets or granules, and may include a coating layer surrounding the leaflets or granular media. When the coating layer is additionally included, manufacturing workability may be increased by improving the hardness of the tobacco medium. A material capable of constituting the coating layer may be used without limitation as long as it is a material known in the art, but as a binder material, alginate; cellulose such as methyl cellulose, ethyl cellulose, ethyl hydroxyethyl cellulose and carboxymethyl cellulose; dextran; gum; gum derivatives such as hydroxyethyl guar gum, hydroxypropyl guar gum, hydroxyethyl locust bean gum and hydroxypropyl locust bean gum; pectins such as fruit pectin, citrus pectin and tobacco pectin; starch, such as modified or derivatized starch; pullulan; and at least one selected from the group consisting of konjac powder.

In one embodiment, the coating layer preferably has pores in order to increase the migration of nicotine from the tobacco material contained in the tobacco medium of the present invention.

In one embodiment, the media of the present invention are filled in heat-not-burn cigarettes, i.e., aerosol-generating articles that are heated rather than burned, typically contained (filled) in cigarettes that are indirectly heated with electrical energy. it is desirable

By way of example, a cigarette comprising the tobacco medium of the present invention may be inserted into an aerosol-generating article comprising a heater. When the cigarette is heated by the heater, an aerosol is generated from the tobacco medium and can be inhaled by the user.

As an embodiment, the tobacco medium of the present invention may include a pulverized tobacco material and an excipient including a pH adjusting agent, and the excipient includes a pH adjusting agent, a binder, and an aerosol other than tobacco materials that may be included in the tobacco medium. Forming agents, other additives, etc. may be included, but are not limited thereto.

As an example, the binder is a material capable of increasing hardness by binding pulverized tobacco materials, etc., and as described above, any material known in the art may be used without limitation, for example, alginate ; cellulose such as methyl cellulose, ethyl cellulose, ethyl hydroxyethyl cellulose and carboxymethyl cellulose; dextran; gum; gum derivatives such as hydroxyethyl guar gum, hydroxypropyl guar gum, hydroxyethyl locust bean gum and hydroxypropyl locust bean gum; pectins such as fruit pectin, citrus pectin and tobacco pectin; starch, such as modified or derivatized starch; pullulan; and at least one selected from the group consisting of konjac powder.

As an example, the aerosol former is a material that volatilizes when heated above a specific volatilization temperature to deliver nicotine or the like as an aerosol, for example, a monohydric alcohol such as menthol; polyhydric alcohols such as triethylene glycol, tetraethylene glycol, 1,3-butanediol, erythritol, propylene glycol and glycerol; esters of polyhydric alcohols such as glycerol mono-, di- or triacetate; aliphatic esters of mono-, di- or polycarboxylic acids such as diethyl suberate, dimethyldodecanedioate, dimethyl tetradecanedioate, ethyl laurate, lauryl acetate and triethyl citrate; benzyl benzoate; benzyl phenyl acetate; ethyl vanillate; lauryl acid; myristic acid; propylene carbonate; And it may include one or more selected from the group consisting of tributyrin, but is not limited thereto.

In one embodiment, the excipients included in the tobacco medium of the present invention include, as other additives, one or more selected from the group consisting of wetting agents, plasticizers, flavoring agents, tobacco and non-tobacco fibers, aqueous and non-aqueous solvents, and combinations thereof This may be additionally included, but is not limited thereto.

As an example, the humectant is a material that helps maintain a desirable level of moisture in the tobacco medium, and may include glycerin or propylene glycol, but is not limited thereto.

As an example, a plasticizer is an agent that increases moldability by softening a material, for example, triacetin, dibutyl phthalate, dibutyl sebacate, diethyl phthalate, dimethyl phthalate, acetyltributyl citrate, acetyltriethyl selected from the group consisting of citrate, diacetylated monoglyceride, dibutyl sebacate, mineral oil, benzyl benzoate, chlorbutanol, glycerin monostearate, lanolin alcohol, and cellulose acetate phthalate compatible plasticizers. It may include one or more, but is not limited thereto.

As an example, a flavoring agent may also be referred to as a flavoring agent and may be an agent that imparts taste and/or aroma to an aerosol generated from tobacco material. Licorice, sucrose, fructose syrup, isosweet, cocoa, lavender, cinnamon, cardamom, celery, fenugreek, cascarilla, sandalwood, bergamot, geranium, honey essence, rose oil, vanilla, lemon oil, orange oil , mint oil, caraway, cognac, jasmine, chamomile, menthol, cinnamon, ylang ylang, sage, spearmint, ginger, coriander or coffee, and the like, but is not limited thereto.

As an example, it may include tobacco cellulose fibers as tobacco fibers and non-tobacco cellulose fibers as non-tobacco fibers. The inclusion of cellulosic fibers may advantageously increase the tensile strength of the tobacco medium. By way of example, suitable non-tobacco cellulosic fibers are known in the art and may include one or more selected from the group consisting of hardwood fibers, softwood fibers, jute fibers, and flax fibers; Not limited to this.

As an embodiment, the present invention may also provide an aerosol-generating article comprising the above-described tobacco medium of the present invention. Specifically, the aerosol-generating article of the present invention is a non-combustion type aerosol-generating article, which may generally include a filter portion and a media portion, wherein the media portion may contain the tobacco media of the present invention.

By way of example, the aerosol-generating article may be manufactured in a generally cylindrical shape, and having a diameter in the range of 5 to 8 mm may be desirable to have the shape and size of a conventional combusted cigarette, but is not limited thereto. Also, as an example, the filter unit included in the aerosol-generating article may be of a type commonly used in the art to which the present invention belongs.

Hereinafter, examples will be described for detailed explanation of the present invention. The present invention is not limited to the following examples, and in the following examples, % refers to % by weight unless otherwise specified.

<Example>

1. Comparison of characteristics according to pH of tobacco media containing the same tobacco material

(1) Tobacco medium preparation and pH measurement

A tobacco medium was prepared using ground tobacco material having the same nicotine content. Tobacco leaves, tobacco stems, etc. are pulverized, and potassium carbonate as a basic pH adjusting agent, glycerol as an aerosol former, hydroxyethyl guar gum as a binder, water helping to form granules, and a solvent of ethanol are included as shown in Table 1 below. After making a slurry, granules were formed. The pulverized tobacco material comprised in granules (a) and (b) has a nicotine content of about 2.9% by weight.

The pH of the granules (a) and (b) was measured at room temperature (about 25° C.) with a pH meter. The granule (a) showed a pH of 7.54 and the granule (b) had a pH of 8.87.

For each granule, the content of free-base nicotine was calculated using the Henderson-Hasselbalch equation of Equation 1 below. The freebase nicotine content of the total nicotine content of the granule (a) was 24.87% by weight, and the freebase nicotine content of the total nicotine content of the granule (b) was 87.62% by weight.

(2) Measurement of nicotine delivery amount and sensory evaluation

A stick containing the tobacco medium prepared in 1. (1) above was prepared. A temperature of about 70 ° C. was applied to each stick to measure the nicotine delivery amount (mg / 10 puff) of 1 to 10 puffs, and scores were scored according to a 7-point scale for off-flavor, irritation, and overall preference during smoking, and the average values are shown in Table 2 below. showed up

Off-odor during smoking means a taste or aroma that does not harmonize with the original taste or aroma of cigarettes and reduces the value of the product.

Irritation means the degree of tingling, tingling, or prickling sensation in the throat, nose, or mouth 1 second after inhalation, and the lower the irritation, the closer to 1 point, and was evaluated.

Overall cigarette taste was evaluated as closer to 7 points as the preference through the overall flavor of cigarette felt after inhalation was higher.

That is, the lower the sensory evaluation score for off-flavor and irritation is, the better, and the higher the sensory evaluation score for overall tobacco taste is, the better.

As a result, even if the nicotine content of the pulverized tobacco material was the same, the stick containing the tobacco medium having a high pH had a high pre-nicotine content and delivered a large amount of nicotine even at a low temperature. In addition, even if the same pulverized tobacco material was used, it was found that the stick containing the tobacco medium (granule (b)) with high pH had strong off-flavor and irritation during smoking, and the overall tobacco taste received a low score.

(3) Evaluation of nicotine storage

Nicotine storage properties were evaluated for the tobacco medium prepared in 1. (1) above. It was observed for about 8 weeks under two storage conditions, the medium being open (OPEN) and sealed in a plastic bag at room temperature, and the results are shown in Table 3 below.

As a result, the tobacco medium with high pH (granule (b)) showed a high nicotine reduction rate after 8 weeks.

2. Comparison of properties of tobacco media containing different tobacco substances

(1) Tobacco medium preparation and pH measurement

Tobacco media in granular form comprising a tobacco material with a high nicotine content was prepared (Example 1 and Example 2). Leaf tobacco with a nicotine content of about 6.4% by weight is pulverized, and, as in 1. (1) above, potassium carbonate as a basic pH adjuster, glycerol as an aerosol former, hydroxyethyl guar gum as a binder, water to help form granules, Granules were formed after making a slurry by including the solvent of ethanol as shown in Table 4 below.

In the case of Comparative Example 1, a slurry was prepared in the same manner as described above, including pulverized tobacco material having a nicotine content of about 2.9% by weight, and then granules were formed.

When the pH of each tobacco medium in Examples 1 and 2 and Comparative Example 1 was measured with a pH meter at room temperature (about 25 ° C.), Example 1 showed 6.6, Example 2 7.3, and Comparative Example 1 7.3. was Example 1 and Comparative Example 1 have the same content of the pH adjusting agent, but the case of Comparative Example 1 showed a higher pH and was measured as 7.3, which is the same as the pH of Example 2.

Based on this, for each tobacco medium, the content of free-base nicotine was calculated using the Henderson-Hasselbalch equation of Equation 1 above. As a result of the calculation, the freebase nicotine content of the total nicotine content of Example 1 was 6.6% by weight, and the freebase nicotine content of the total nicotine content of Example 2 and Comparative Example 1 was 16.0% by weight.

(2) Measuring the amount of nicotine delivered

Sticks containing the tobacco medium of Examples 1 and 2 and Comparative Example prepared in 2. (1) were prepared. Each stick was filled with 400 mg of tobacco medium, and a temperature of about 70 ° C. was applied to perform 1 to 10 puffs to measure the amount of nicotine delivered (mg / 10 puff), and the amount of free base nicotine was calculated and shown in Table 5 below. showed up

As a result, Example 1 with a lower pH showed a higher nicotine delivery amount. In addition, Comparative Example 1 and Example 2 had the same pH, but Example 2 showed a higher nicotine delivery amount than Comparative Example 1.

Compared to the case of Comparative Example 1 containing a conventional tobacco material having a nicotine content of 0.1 to 3.5% by weight, when a tobacco raw material containing a high nicotine content of 4% by weight or more was used as in Example, at a lower pH, more It can be seen that a lot of nicotine can be delivered, so that it can have advantages in off-flavor and storage properties.

Although the above has been described with reference to preferred embodiments of the present invention, those skilled in the art will variously modify and change the present invention within the scope not departing from the spirit and scope of the present invention described in the claims below. You will understand that it can be done.

Claims (10)

A tobacco medium comprising ground tobacco material and a pH adjusting agent,
wherein the pulverized tobacco material comprises at least 70% by weight of the tobacco medium on a dry weight basis;
wherein the pulverized tobacco material comprises at least 4.0% nicotine by weight on a dry weight basis;
wherein the tobacco medium comprises at least 2.8% nicotine by weight on a dry weight basis, and wherein the pH of the tobacco medium is between 6 and 9. According to claim 1,
The tobacco medium according to claim 1 , wherein the tobacco medium is filled in a non-combustion aerosol generating article. According to claim 2,
The tobacco medium of claim 1, wherein the aerosol-generating article has a heating temperature of 30 to 180 °C. According to claim 1,
Tobacco medium, wherein the tobacco medium is prepared in sheet or granular form. According to claim 4,
The tobacco medium according to claim 1 , wherein the granular form comprises a core and a shell surrounding the core. According to claim 4,
Tobacco medium, wherein the tobacco medium further comprises a coating layer on the periphery of the leaflet or granular form. According to claim 4,
Tobacco medium, wherein the tobacco medium further comprises a coating layer on the periphery of the leaflet or granular form. To an aerosol-generating article comprising a tobacco medium,
said tobacco medium comprising comminuted tobacco material and a pH adjusting agent;
wherein the pulverized tobacco material comprises at least 70% by weight of the tobacco medium on a dry weight basis;
wherein the pulverized tobacco material comprises at least 4.0% nicotine by weight on a dry weight basis;
wherein the tobacco medium comprises at least 2.8% nicotine on a dry weight basis, and the pH of the tobacco medium is between 6 and 9. According to claim 8,
An aerosol-generating article, characterized in that the aerosol-generating article is non-combustible. According to claim 9,
wherein the aerosol-generating article has a heating temperature of 30 to 180 °C.

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