WO2025181885A1 - Tobacco extract, tobacco filler, non-combustion heating type smoking article, and method for producing tobacco extract - Google Patents

Abstract

The present invention addresses the problem of providing a tobacco extract exhibiting the mild flavor inherent in leaf tobacco.　Provided is a tobacco extract satisfying 0 < L×10/H ≤ 0.55, where H represents the total peak area of components having a retention index (RI) of 1800 to 3100 in gas chromatography, and L represents the total peak area of components having an RI of 1365 to less than 1800.

Description

Tobacco extract, tobacco filler, non-combustion heated smoking article, and method for producing tobacco extract

The present invention relates to tobacco extracts, tobacco fillers, non-combustion heated smoking articles, and methods for producing tobacco extracts.

Non-combustion heated smoking articles generally heat tobacco rods to 150-350°C to generate flavor components, which are then delivered along with the aerosol. Among these flavor components, sesquiterpenes, diterpenes, higher fatty acids, and higher hydrocarbons are known to be unique compared to other plants. In particular, there are high expectations for the use of cembranoid and labdanoid diterpenes, which are resinous components of tobacco leaves and are secreted by trichomes present on the leaf surface (see, for example, Patent Document 1).

International Publication No. 2022/102541

The amount of diterpenes such as α-cembratrienediol decreases during the drying process after harvesting mature tobacco leaves, and as the cured tobacco leaves undergo various processes. For example, when using heat drying, which involves drying flue-cured tobacco in a short period of time using a heated fan, as with flue-cured tobacco, the amount of α-cembratrienediol decreases by approximately 20%. Furthermore, when using ventilation drying, which involves drying under natural temperature and humidity conditions, as with burley varieties, the amount of α-cembratrienediol decreases by approximately 80%. The inventors conceived the idea that if the decrease in α-cembratrienediol and other compounds could be avoided, smoking articles with a superior flavor could be provided. Incidentally, as noted in Patent Document 1, tobacco extracts extracted from tobacco raw materials are sometimes used as components of tobacco materials. In light of these circumstances, an objective of the present invention is to provide a tobacco extract that retains the soft flavor inherent to leaf tobacco.

The inventors have found that the above problems can be solved by the following invention.
[1] The sum of the peak areas of components having a retention index (RI) of 1800 to 3100 in gas chromatography is defined as H,
When the sum of the peak areas of the components having an RI of 1365 or more and less than 1800 is L,
0<L×10/H≦0.55
fulfill,
Tobacco extract.
[2] 0<L×10/H≦0.30
The tobacco extract according to [1], which satisfies the above.
[3] When the peak area of phytol with an RI of 2114 is P,
0<L/P≦1.2
The tobacco extract according to [1] or [2], which satisfies the above.
[4] (A) A tobacco filler containing the tobacco extract according to any one of [1] to [3].
[5] The tobacco filler according to [4], wherein the tobacco filler contains 0.1 to 5% by weight of (A).
[6] The tobacco filler according to [4] or [5], further comprising (B) non-pulp fibers and (C) a binder.
[7] The tobacco filler according to [6], wherein the tobacco filler contains 15 to 50% by weight of (B) and (C) in total.
[8] (D) A tobacco filler according to any one of [4] to [7], further comprising an aerosol source.
[9] The tobacco filler according to [8], wherein the tobacco filler contains 10 to 60% by weight of (D).
[10] A non-combustion heating type smoking article comprising the tobacco filler described in any one of [4] to [9].
[11]
(1) providing a tobacco-derived material;
(2) subjecting the raw material to solid-liquid extraction using an organic solvent;
(3) recovering the organic phase from step (2); and (4) removing the solvent from the organic phase to obtain a tobacco extract.
[12] The harvested tobacco leaves are subjected to one or more of the following drying processes:
(i) drying the tobacco leaves at a relative humidity of 15 to 70% and a temperature of 35 to 80°C for 40 to 100 hours from the initial stage; and (ii) subjecting the tobacco leaves to a step of drying using microwaves to prepare a tobacco-derived raw material.
The method according to [11].

The present invention provides a tobacco extract with a soft flavor.

FIG. 1 is a diagram showing one embodiment of a non-combustion heating type smoking article. FIG. 1 is a diagram showing one embodiment of a non-combustion heating smoking system. FIG. 1 shows a gas chromatograph of sample 1. FIG. 10 is a diagram showing a gas chromatograph of sample 2. FIG. 10 is a diagram showing a gas chromatograph of sample 3. FIG. 10 is a diagram showing a gas chromatograph of sample 5. FIG. 1 is a diagram illustrating the relationship between a gas chromatograph and RI. 1 is a graph showing the total peak area L of component L. 1 is a graph showing the total peak area H of component H.

In this disclosure, "X to Y" includes the extreme values X and Y.

1. Tobacco Extract The tobacco extract of the present invention is
The sum of the peak areas of components having a retention index (RI) of 1800 to 3100 in gas chromatography is designated as H,
When the sum of the peak areas of the components having an RI of 1365 or more and less than 1800 is L,
0<L×10/H≦0.55
Meet the following.
"L×10/H" will hereinafter also be referred to simply as "L/H ratio."
The tobacco extract of this embodiment can exhibit a soft flavor. Furthermore, the tobacco extract of this embodiment can enhance flavors such as mint flavor.

Components with an RI between 1800 and 3100 (hereinafter referred to as "Component H") express the original tobacco aroma. Component H is a group of components including partial decomposition products of chlorophyll, leaf resin, higher fatty acids, and higher hydrocarbons. Specifically, Component H includes neophytadiene (RI = 1842), phytol (RI = 2114), α-cembratriene diol (α-CBT, RI = 2242), linoleic acid (RI = 2145), etc. On the other hand, components with an RI between 1365 and 1800 (hereinafter referred to as "Component L") are a group of components including cembratriene decomposition products and carotenoid decomposition products. Component L includes 3-oxo-α-ionone (RI=1648), solanone (RI=1368), norsolanadione (RI=1489), megastigmatrienone (RI=1581), etc.

The tobacco extract in this embodiment satisfies 0 < L x 10/H ≤ 0.55. In other words, the content of component H relative to component L is high. This allows the complex aroma inherent to tobacco to be expressed. The upper limit of L x 10/H is preferably 0.30 or less, more preferably 0.25 or less, and most preferably 0.20 or less.

Furthermore, the tobacco extract is not particularly limited, but can satisfy the relationship 0 < L/P ≦ 1.2, where P is the peak area of phytol with an RI of 2114. The upper limit of L/P is preferably 1.2 or less, more preferably 1.0 or less, and most preferably 0.6 or less.

The tobacco extract in this embodiment can be produced based on the tobacco extract production method described below.

RI can be determined by a known method using a standard saturated alkane standard, but in this embodiment, it is preferably determined by the following method.
1) Standard saturated alkane standards (for example, C7-C40 manufactured by Merck) are diluted with hexane to use hexane (C6) to tetracontane (C40) as indicators.
2) The linear retention index is calculated based on the following formula and is defined as RI.
RI = 100 × {[(tr(unknown) - tr(n)] / [tr(N) - tr(n)] + n}
n = number of carbon atoms in the n-alkane eluting immediately before the unknown component N = number of carbon atoms in the n-alkane eluting immediately after the unknown component tr = retention time

A tobacco flavoring agent (hereinafter also referred to as "tobacco flavoring agent") containing the tobacco extract of the present invention can also be prepared. The tobacco flavoring agent is useful as an additive to tobacco materials. Examples of tobacco materials include tobacco sheets, tobacco shreds, cigarette papers, polysaccharide sheets, etc.

2. Method for Producing Tobacco Extract The method for producing a tobacco extract of the present invention comprises:
(1) providing a tobacco-derived material;
(2) subjecting the raw material to solid-liquid extraction using an organic solvent;
(3) recovering the organic phase from step (2); and (4) removing the solvent from the organic phase to obtain a tobacco extract.
By going through the above steps, decomposition of component H can be suppressed, and as a result, L×10/H can be set within the above range.

Process (1)
In this process, a tobacco-derived raw material is prepared. The tobacco-derived raw material is a raw material derived from a Nicotiana plant, and examples thereof include tobacco raw materials such as tobacco leaves, aged tobacco leaves, tobacco shreds, or tobacco powder, as well as processed products or waste products obtained by subjecting tobacco raw materials to processing. Tobacco leaves are a general term for harvested tobacco leaves before they undergo aging. One form of aging includes curing. Tobacco shreds are aged tobacco leaves or the like that have been shredded to a predetermined size. Tobacco powder is obtained by pulverizing tobacco leaves or the like.

Process (2)
In this process, tobacco-derived raw materials are subjected to solid-liquid extraction using an organic solvent. Examples of organic solvents include hydrocarbons such as hexane; esters such as ethyl acetate, butyl butyrate, and ethyl butyrate; halogenated hydrocarbons such as dichloromethane and chloroform; ketones such as acetone; and nitriles such as acetonitrile. Among these, hexane, ethyl acetate, or a mixture thereof is preferred from the viewpoint of efficient extraction of the target component H, with hexane being more preferred. Furthermore, solvents with a boiling point of 80°C or less are preferred from the viewpoint of ease of removal in subsequent processes. Therefore, the solvent is preferably hexane, ethyl acetate, butyl butyrate, ethyl butyrate, dichloromethane, or chloroform; more preferably hexane, ethyl acetate, butyl butyrate, and ethyl butyrate; and even more preferably hexane or ethyl acetate. In this process, the target component H is transferred to the organic solvent (organic phase). The above organic solvents can be used alone or in combination. Furthermore, the extraction temperature may be set to approximately 35 to 40°C, taking into account the melting point of component H and its solubility in the organic phase.

Process (3)
In this step, the organic phase (or organic layer) obtained in step (2) is recovered. The organic phase is the organic phase obtained by the solid-liquid extraction. The recovery method is not limited, and can be carried out using, for example, a separatory funnel. If necessary, the aqueous phase can be washed with an organic solvent, and the solvent after washing can be added to the organic phase. In this way, a tobacco extract solution containing component H can be obtained.

Process (4)
In this step, the organic solvent is removed from the organic phase to obtain a tobacco extract. The method for removing the solvent is not limited, and an evaporator can be used, for example.

Step (4) may further comprise a step of dehydrating the organic phase before removing the organic solvent from the organic phase. The dehydration method is not limited, and can be carried out by adding a drying agent such as anhydrous sodium sulfate.
Step (4) may further include a step of removing solids contained in the organic layer before removing the organic solvent from the organic phase. The step of removing the solids may be carried out after the step of dehydrating the organic layer. The removal method is not limited, and may be performed by filtration or decantation.

The method for producing a tobacco extract of this embodiment comprises subjecting harvested tobacco leaves to one or more of the following drying processes:
The method may further include (i) a step of drying the tobacco leaves from the initial stage at a relative humidity of 15 to 70% and at 35 to 80°C for 40 to 100 hours, and (ii) a step of subjecting the tobacco leaves to a step of drying using microwaves to prepare a tobacco-derived raw material.
By drying the harvested tobacco leaves in this manner, the decomposition of component H can be suppressed, and as a result, L×10/H can be set within the above range.

Process (i)
This process is carried out by harvesting common tobacco leaves, such as burley varieties, and drying the harvested leaves. Drying is preferably carried out using, for example, a hot air circulation device. This process is preferably carried out in multiple stages. For example, this process is carried out through a first stage of drying at a low temperature (35°C, relative humidity 60-70%), a second stage of drying at a medium temperature (40-50°C, relative humidity 35-50%), and a third stage of drying at a high temperature (60-75°C, relative humidity 15-30%). The duration of each stage can be adjusted as appropriate, but can be, for example, about 10-20 hours for the first stage, 20-30 hours for the second stage, and 20-50 hours for the third stage.

When drying is carried out in this manner, the mesophyll portion is dried first, and then the entire tobacco leaf, including the veins, is dried. This prevents cell destruction in the mesophyll portion, preventing the release of oxidase, and also reduces the moisture content of the mesophyll portion, inhibiting the reaction between component H and oxidase. This has the advantage of preventing the reduction of leaf surface resin in tobacco that contains component H. Furthermore, with this drying method, some curing (chlorophyll decomposition) occurs, although not at the level of general curing, so the amount of component H can be increased.

Process (ii)
In this process, post-harvest tobacco leaves are dried using microwaves. There are no particular limitations on the environmental conditions for microwave drying. However, since the moisture released from the tobacco leaves may increase, resulting in an increase in environmental humidity, it is preferable to remove water vapor by appropriate ventilation. Microwaves are generated by a general magnetron and can be irradiated at a practical frequency of 915 MHz or 2450 MHz at an output level ranging from 0.6 to 100 kW. Microwave drying tends to destroy mesophyll cells, but the drying time can be shortened, thereby suppressing the reaction between component H and oxidase.

3. Tobacco Filler Tobacco filler is a flavor source that is packed into a smoking article.
The tobacco filler according to this embodiment preferably contains (A) a tobacco extract that satisfies the above L/H ratio.
The tobacco extract (also referred to as "component (A)") that satisfies the above L/H ratio is as described above. The amount of component (A) in the filling is preferably 0.1 to 5 wt %, more preferably 0.3 to 3 wt %, and most preferably 0.3 to 1.5 wt %. In this disclosure, the amount of a component is expressed by dry weight unless otherwise specified.

(Non-pulp fiber)
The tobacco filler according to this embodiment preferably contains (B) non-pulp fibers.
Non-pulp fibers (also referred to as "component (B)") are fibers other than pulp fibers. Pulp fibers are an aggregate of cellulose fibers extracted from plants such as wood, and are usually used as a raw material for paper. Examples of pulp fibers include recycled paper pulp, chemical pulp, and mechanical pulp. In the present invention, non-pulp fibers are preferably derived from plants. Plant-derived fibers are biodegradable and therefore have a small environmental impact.

The average fiber diameter of the non-pulp fibers is preferably 25 μm or less, more preferably 20 μm or less, and even more preferably 15 μm or less. There is no lower limit to the average fiber diameter, but it is preferably 2 nm or more, 10 nm or more, 100 nm or more, 1 μm or more, or 5 μm or more.

The average fiber diameter of non-pulp fibers can be determined by acquiring an image of the fiber, measuring the width (short axis) of multiple fibers, and averaging these values. If the fiber shape is columnar (with a rectangular cross section), the width of the main surface (the longer one) of the main surface width and the side surface width is taken as the width of the fiber. The number of fibers measured is preferably 100 or more.

The non-pulp fiber is preferably monofilamented cellulose. Monofilamented cellulose is a thin fiber obtained by subjecting pulp fibers to a process such as defibration. Monofilamented cellulose may also be chemically modified by oxidation or other methods. The average fiber diameter of monofilamented cellulose is as described above. There are no limitations on the average fiber length of monofilamented cellulose, but the upper limit is preferably 2000 μm or less, more preferably 1500 μm or less. The lower limit is preferably 100 μm or more, more preferably 500 μm or more.

Furthermore, the non-pulp fiber is preferably dietary fiber. Dietary fiber is a food component that is not digested by human digestive enzymes, and in the present invention, insoluble dietary fiber that does not dissolve in water is more preferable. The dietary fiber may be porous, i.e., spongy. From the standpoint of availability, the fiber is preferably citrus fiber. Citrus fiber is a fiber made primarily from the albedo of citrus fruits. The average fiber diameter of citrus fiber is as described above. Furthermore, the dietary fiber may be short fibers or columnar particles with a small aspect ratio.

In one embodiment, monofilamented cellulose and dietary fiber are used in combination. Using both in combination improves the strength, water dispersibility, and smoke sensation of the tobacco sheet (tobacco filler). The upper limit of the weight of monofilamented cellulose per part by weight of dietary fiber is preferably 1.5 parts by weight or less, more preferably 1.2 parts by weight or less, and the lower limit is preferably 0.1 or more, more preferably 0.3 or more.

It is preferable that all fibers in the tobacco filler are non-pulp fibers, but the tobacco filler may also contain fibers other than non-pulp fibers. In this case, the amount of non-pulp fibers in the total fibers is preferably 60 to 99% by weight, and more preferably 70 to 90% by weight.

In the tobacco filler, the amount of component (B) is preferably 1 to 30% by weight, more preferably 2 to 15% by weight, and most preferably 5 to 10% by weight.

(binder)
The tobacco filler according to this embodiment preferably contains a binder (C).
The binder (also referred to as "component (C)") binds together the components of the tobacco filler to maintain the integrity of the tobacco filler. Examples of binders include pullulan, hydroxypropyl cellulose (HPC), guar gum, xanthan gum, carboxymethyl cellulose (CMC), sodium carboxymethyl cellulose (CMC-Na), and mixtures thereof.
In the tobacco filler, the amount of component (C) is preferably 1 to 30% by weight, more preferably 3 to 10% by weight, and most preferably 4 to 6% by weight.

In the tobacco filler, the total amount of (B) and (C) is preferably 8 to 50% by weight, more preferably 10 to 30% by weight, and most preferably 5 to 15% by weight. In the tobacco filler, the total amount of (B) and (C) can also be 15 to 50% by weight.

(aerosol source)
The tobacco filler according to this embodiment preferably includes (D) an aerosol source.
The aerosol source (also referred to as "component (D)") is a material that vaporizes when heated and cools to generate an aerosol, or that generates an aerosol by atomization. When the filler contains an aerosol source, a sufficient amount of smoke can be achieved. Known aerosol sources can be used, and examples include polyhydric alcohols such as glycerin, vegetable glycerin, propylene glycol (PG), triethyl citrate (TEC), and triacetin. The amount of the aerosol source in the filler is preferably 10 to 60 wt %, more preferably 10 to 30 wt %, and most preferably 15 to 20 wt %. If the amount of the aerosol source exceeds the upper limit, stains or the like may occur on the tobacco segments, while if it is below the lower limit, the perceived smoke intensity may be reduced.

(Tobacco materials other than component (A))
The tobacco filler according to this embodiment may contain a tobacco material other than component (A) (also referred to as "component (E)").
Component (E) is not limited as long as it is a material derived from a Nicotiana plant. Specific examples of component (E) include tobacco shreds, tobacco powder, tobacco sheets, and strands, which are commonly used in the art. These may be used alone or in combination. Among these, cut tobacco shreds and tobacco sheets are preferred as component (E) from the viewpoint of excellent miscibility with component (A).

The tobacco leaves used in component (E) are preferably those of the Nicotiana genus, such as Tabacum and Rustica. There are no restrictions on the variety, and well-known varieties such as burley or flue-cured tobacco can be used. One or more of these tobacco leaves can be mixed and used. A suitable blend of the aforementioned varieties can be used as the mixture to achieve the desired flavor.

The amount of component (E) in the filler is preferably 5 to 85% by weight, more preferably 25 to 65% by weight.

(Non-tobacco flavoring agents)
The tobacco filler may further contain a non-tobacco flavoring agent (also referred to as "component (F)"). The non-tobacco flavoring agent is a flavoring agent that is not derived from tobacco. Examples of the non-tobacco flavoring agent include a flavoring agent, a powdered foodstuff, a cooling agent, and combinations thereof. Known flavoring agents, powdered foodstuffs, and cooling agents can be used.

In particular, the following flavorings or cooling agents may be used alone or in combination:
Acetanisole, acetophenone, acetylpyrazine, 2-acetylthiazole, alfalfa extract, amyl alcohol, amyl butyrate, trans-anethole, star anise oil, apple juice, balsam of Peru oil, beeswax absolute, benzaldehyde, benzoin resinoid, benzyl alcohol, benzyl benzoate, benzyl phenylacetate, benzyl propionate, 2,3-butanedione, 2-butanol, butyl butyrate, butyric acid, caramel, cardamom oil, carob absolute, β-carotene, carrot juice, L-carvone, β- Caryophyllene, cassia bark oil, cedarwood oil, celery seed oil, chamomile oil, cinnamaldehyde, cinnamic acid, cinnamyl alcohol, cinnamyl cinnamate, citronella oil, DL-citronellol, clary sage extract, cocoa, coffee, konjac oil, coriander oil, cuminaldehyde, davana oil, δ-decalactone, γ-decalactone, decanoic acid, dill herb oil, 3,4-dimethyl-1,2-cyclopentanedione, 4,5-dimethyl-3-hydroxy-2,5-dihydrofuran-2-one, 3,7-dimethyl-6-octenoic acid, 2,3 -dimethylpyrazine, 2,5-dimethylpyrazine, 2,6-dimethylpyrazine, ethyl 2-methylbutyrate, ethyl acetate, ethyl butyrate, ethyl hexanoate, ethyl isovalerate, ethyl lactate, ethyl laurate, ethyl levulinate, ethyl maltol, ethyl octanoate, ethyl oleate, ethyl palmitate, ethyl phenylacetate, ethyl propionate, ethyl stearate, ethyl valerate, ethyl vanillin, ethyl vanillin glucoside, 2-ethyl-3,(5 or 6)-dimethylpyrazine, 5-ethyl-3-hydroxy-4-methyl-2(5H)-furanone, 2 -Ethyl-3-methylpyrazine, eucalyptol, fenugreek absolute, gene absolute, gentian root infusion, geraniol, geranyl acetate, grape juice, guaiacol, guava extract, gamma-heptalactone, gamma-hexalactone, hexanoic acid, cis-3-hexen-1-ol, hexyl acetate, hexyl alcohol, phenylhexyl acetate, honey, 4-hydroxy-3-pentenoic acid lactone, 4-hydroxy-4-(3-hydroxy-1-butenyl)-3,5,5-trimethyl-2-cyclohexen-1-one, 4- (para-hydroxyphenyl)-2-butanone, sodium 4-hydroxyundecanoate, inmortell absolute, beta-ionone, isoamyl acetate, isoamyl butyrate, isoamyl phenylacetate, isobutyl acetate, isobutyl phenylacetate, jasmine absolute, cola nut tincture, labdanum oil, lemon terpeneless oil, licorice extract, linalool, linalyl acetate, lovage root oil, maltol, maple syrup, menthol, menthone, L-menthyl acetate, paramethoxybenzaldehyde, methyl-2-pyrrolyl ketone, an Methyltranilate, Methyl Phenylacetate, Methyl Salicylate, 4'-Methylacetophenone, Methylcyclopentenolone, 3-Methylvaleric Acid, Mimosa Absolute, Honey Honey, Myristic Acid, Nerol, Nerolidol, γ-Nonalactone, Nutmeg Oil, δ-Octalactone, Octanal, Octanoic Acid, Orange Flower Oil, Orange Oil, Orris Root Oil, Palmitic Acid, ω-Pentadecalactone, Peppermint Oil, Petitgrain Oil of Paraguay, Phenethyl Alcohol, Phenethyl Phenylacetate, Phenylacetic Acid, Piperonal, Plum Extract, Propenyl Glycol Aethol, propyl acetate, 3-propylidenephthalide, prune juice, pyruvic acid, raisin extract, rose oil, rum, sage oil, sandalwood oil, spearmint oil, styrax absolute, marigold oil, tea distillate, α-terpineol, terpinyl acetate, 5,6,7,8-tetrahydroquinoxaline, 1,5,5,9-tetramethyl-13-oxacyclo(8.3.0.0(4.9))tridecane, 2,3,5,6-tetramethylpyrazine, thyme oil, tomato extract, 2-tridecanone, triethyl citrate , 4-(2,6,6-trimethyl-1-cyclohexenyl)2-buten-4-one, 2,6,6-trimethyl-2-cyclohexene-1,4-dione, 4-(2,6,6-trimethyl-1,3-cyclohexadienyl)2-buten-4-one, 2,3,5-trimethylpyrazine, γ-undecalactone, γ-valerolactone, vanilla extract, vanillin, veratraldehyde, violet leaf absolute, N-ethyl-p-menthane-3-carboxamide (WS-3), ethyl-2-(p-menthane-3-carboxamide)acetate (WS-5).
The powdered food is not particularly limited, but general-purpose products include known powders made from plants such as cocoa powder, licorice powder, St. John's powder, and vanilla beans, and can be added alone or in combination of two or more types.

Among these, it is preferable to use a flavoring with an RI of 1600 or less. Ordinary tobacco extracts contain a relatively large amount of components (component L) with an RI of 1600 or less. As a result, with ordinary tobacco extracts, the flavoring and component L can interfere with each other, preventing the flavoring's properties from being fully exhibited. However, the tobacco filler of this embodiment is able to fully exhibit the properties of the flavoring. Menthol is particularly preferable as a flavoring with an RI of 1600 or less.

Tobacco filler can be manufactured by known methods. For example, it can be manufactured by mixing the various components. Alternatively, the various components can be mixed to form a composition, which can then be spread on a surface to prepare a sheet, which can then be used as the filler as is, or the sheet can be shredded and used as the filler.

4. Non-combustion heating smoking article The non-combustion heating smoking article of the present invention comprises the tobacco filler described in 3 above.
The tobacco filler is suitable for use in non-combustion heat-activated smoking articles. FIG. 1 shows one embodiment of a non-combustion heat-activated smoking article. As shown in the figure, the non-combustion heat-activated smoking article 20 comprises a tobacco segment 20A, a cylindrical cooling section 20B having perforations on its circumference, and a filter section 20C. The non-combustion heat-activated smoking article 20 may also comprise other components. The axial length of the non-combustion heat-activated smoking article 20 is not limited, but is preferably 40 to 90 mm, more preferably 50 to 75 mm, and even more preferably 50 to 60 mm. The circumferential length of the non-combustion heat-activated smoking article 20 is preferably 16 to 25 mm, more preferably 20 to 24 mm, and even more preferably 21 to 23 mm. For example, the tobacco segment 20A may be 20 mm long, the cooling section 20B may be 20 mm long, and the filter section 20C may be 7 mm long. The lengths of these individual components can be appropriately changed depending on manufacturing suitability, required quality, and the like. Although FIG. 1 shows an embodiment in which the first segment 25 is disposed, it is also possible to dispose the first segment 25 and to dispose only the second segment 26 downstream of the cooling section 20B.

1) Tobacco segment 20A
The tobacco filler 21 in the tobacco segment 20A contains a tobacco extract having the specific L/H ratio or a tobacco filler containing the same. The method for filling the tobacco filler 21 into the wrapper (cigarette paper) 22 is not particularly limited; for example, the tobacco filler 21 may be wrapped in the wrapper 22, or the tobacco filler 21 may be filled into a tubular wrapper 22. When the tobacco filler has a longitudinal direction, such as a rectangular shape, it may be filled so that the longitudinal direction is in an unspecified direction within the wrapper 22, or may be aligned in the axial direction of the tobacco segment 20A or in a direction perpendicular to the axial direction. When the tobacco segment 20A is heated, the tobacco components, aerosol source, and water contained in the tobacco filler 21 vaporize and are available for inhalation.

2) Cooling section 20B
The cooling section 20B is preferably configured as a tubular member. The tubular member may be, for example, a cardboard tube 23 formed by processing cardboard into a cylindrical shape. Alternatively, the cooling section 20B may be formed from a thin sheet of material that is wrinkled and then pleated, gathered, or folded to form channels. Examples of such materials include sheet materials selected from the group consisting of polyethylene, polypropylene, polyvinyl chloride, polyethylene terephthalate, polylactic acid, cellulose acetate, and aluminum foil. The total surface area of the cooling section 20B is appropriately adjusted taking cooling efficiency into consideration, but may be, for example, 300 to 1000 ^{mm 2} /mm 2 . The cooling section 20B is preferably provided with perforations 24. The presence of the perforations 24 allows ambient air to be introduced into the cooling section 20B during inhalation. This allows the vaporized aerosol components generated by heating the tobacco segment 20A to come into contact with the ambient air, lowering their temperature and liquefying them to form an aerosol. The diameter (distance across) of the perforations 24 is not particularly limited, but may be, for example, 0.5 to 1.5 mm. The number of perforations 24 is not particularly limited, and may be one or two or more. For example, a plurality of perforations 24 may be provided on the circumference of the cooling portion 20B.

The cooling section 20B can be rod-shaped with an axial length of, for example, 7 to 28 mm. For example, the axial length of the cooling section 20B can be 18 mm. The axial cross-sectional shape of the cooling section 20B can be substantially circular, with a diameter of 5 to 10 mm. For example, the diameter of the cooling section can be approximately 7 mm.

3) Filter part 20C
The configuration of the filter portion 20C is not particularly limited, and may be composed of one or more packed layers. The outside of the packed layer may be wrapped with one or more sheets of wrapping paper. The airflow resistance of the filter portion 20C can be appropriately changed depending on the amount and material of the filter filler filled in the filter portion 20C. For example, when the filter filler is cellulose acetate fiber, increasing the amount of cellulose acetate fiber filled in the filter portion 20C can increase the airflow resistance. When the filter filler is cellulose acetate fiber, the packing density of the cellulose acetate fiber may be 0.13 to 0.18 g/ ^cm3 . The airflow resistance is a value measured using an airflow resistance measuring device (product name: SODIMAX, manufactured by SODIM).

The circumferential length of the filter portion 20C is not particularly limited, but is preferably 16 to 25 mm, more preferably 20 to 24 mm, and even more preferably 21 to 23 mm. The axial length of the filter portion 20C (the horizontal direction in FIG. 1) can be selected from 4 to 10 mm, and is selected so that the airflow resistance is 15 to 60 mmH ₂ O/seg. The axial length of the filter portion 20C is preferably 5 to 9 mm, more preferably 6 to 8 mm. The cross-sectional shape of the filter portion 20C is not particularly limited, but can be, for example, circular, elliptical, polygonal, etc. In addition, a frangible capsule containing a fragrance, fragrance beads, or fragrance may be directly added to the filter portion 20C.

The filter portion 20C may have a center hole portion as the first segment 25. The center hole portion is composed of a first filling layer 25a having one or more hollow portions and an inner plug wrapper (inner wrapping paper) 25b that covers the filling layer. The center hole portion functions to increase the strength of the mouthpiece portion. The center hole portion may not have an inner plug wrapper 25b and its shape may be maintained by thermoforming. The filter portion 20C may have a second segment 26. The second segment 26 is composed of a second filling layer 26a and an inner plug wrapper (inner wrapping paper) 26b that covers the filling layer. The second filling layer 26a may be, for example, a rod with an inner diameter of 5.0 to 1.0 mm, densely packed with cellulose acetate fibers and hardened with 6 to 20% by weight of a plasticizer containing triacetin added to the cellulose acetate. Because the second filling layer has a high fiber packing density, during inhalation, air and aerosol flow only through the hollow portions and hardly any flow within the second filling layer. Because the second filling layer inside the center hole is a fiber-filled layer, the feel from the outside during use is less likely to cause discomfort to the user.

The first filling layer 25a and the second filling layer 26a are connected by an outer plug wrapper (outer wrapping paper) 27. The outer plug wrapper 27 can be, for example, a cylindrical piece of paper. The tobacco segment 20A, the cooling section 20B, and the connected first filling layer 25a and second filling layer 26a are connected by a mouthpiece lining paper 28. These connections can be made, for example, by applying glue such as vinyl acetate glue to the inner surface of the mouthpiece lining paper 28 and wrapping the three components around it. These components may also be connected in multiple layers using multiple lining papers.

The combination of a non-combustion heated smoking article and a heating device for generating aerosol is also referred to as a non-combustion heated smoking system. An example of such a system is shown in Figure 2. In the figure, the non-combustion heated smoking system comprises a non-combustion heated smoking article 20 and a heating device 10 that heats a tobacco segment 20A from the outside.

The heating device 10 comprises a body 11, a heater 12, a metal tube 13, a battery unit 14, and a control unit 15. The body 11 has a cylindrical recess 16, and the heater 12 and metal tube 13 are positioned corresponding to the tobacco segment 20A to be inserted therein. The heater 12 may be an electrical resistance heater, and is heated by power supplied from the battery unit 14 in response to instructions from the temperature-controlling control unit 15. The heat generated by the heater 12 is transferred to the tobacco segment 20A through the metal tube 13, which has high thermal conductivity. While the figure shows a configuration in which the heating device 10 heats the tobacco segment 20A from the outside, it may also heat from the inside. The heating temperature of the heating device 10 is not particularly limited, but is preferably 400°C or less, more preferably 150 to 400°C, and even more preferably 200 to 350°C. The heating temperature refers to the temperature of the heater in the heating device 10. It is also possible to place a susceptor inside the tobacco segment 20A and heat the tobacco segment 20A using the induction method.

1. Sample Preparation 1-1. Green Drying Japanese burley or Brazilian burley was prepared and dried as follows to prepare dried leaves. The leaves obtained by this drying are also called green dried leaves.
1) Harvested burley tobacco leaves were placed in a hot air circulating device.
2) The leaves were kept at a temperature of 35°C and a relative humidity of 64% RH for 12 hours.
3) The mesophyll was then dried at a temperature of 45°C and a relative humidity of 41% for 24 hours, and finally the entire tobacco leaf including the veins was dried in an atmosphere at a temperature of 68°C and a relative humidity of 19% for 36 hours.
4) After drying, the leaves were removed from the hot air circulator without humidifying it, and dried leaves with a yellow-green to dark green color (hereinafter referred to as green dried leaves) were obtained. The green dried leaves were separated into mesophyll and vein portions using a thresher, and the mesophyll portion was quickly sealed and packaged in vinyl. The package was kept sealed until it was used for extraction processing or sheet molding.

1-2. Preparation of Tobacco Extract 1-2-1. Preparation of Oleoresin (Semi-Solid Extract) Using Organic Solvents 150 g of mesophyll was removed from the package (Japanese burley or Brazilian burley) obtained in 1-1 above and placed in a 2500 ml sealed stainless steel container. Next, 1500 ml of n-hexane or ethyl acetate (Fujifilm Wako Pure Chemical Industries, Ltd., high-performance liquid chromatograph grade) was added to the container, and extraction was performed for 3 hours in a sealed 40°C hot bath with stirring. After extraction, the hexane or ethyl acetate was separated from the extraction residue using a 250 μm stainless steel mesh, yielding approximately 1300 ml of hexane or ethyl acetate solution. After allowing each solution to stand for a sufficient period of time, the organic layer was removed, and approximately 50 g of anhydrous sodium sulfate was added and stirred to dehydrate the organic layer. The dehydrated organic layer was then filtered using filter paper (Advantec 5A) to remove insoluble matter. Hexane or ethyl acetate was further removed from the obtained organic layer after filtration under reduced pressure using a rotary evaporator (manufactured by Nippon Buchi Co., Ltd.), and a dry product (hereinafter referred to as "Sample 2") was obtained from the hexane-extracted solid in a yield of 2.2 to 2.5 wt %, and a dry product (hereinafter referred to as "Sample 1") was obtained from the ethyl acetate-extracted solid in a yield of 7.3 to 7.5 wt %, respectively.

Furthermore, dried Brazilian burley leaves (hereinafter referred to as dried burley leaves) produced by a standard method were prepared, and as in 1-1 above, the dried burley leaves were separated into mesophyll and vein portions using a thresher to obtain the mesophyll portion. The obtained mesophyll portion was treated in the same manner as the above-mentioned green dried leaves were treated with hexane, and a dry product (hereinafter referred to as "Sample 4") was obtained with a yield of 4.5 to 5.5% by weight.

1-2-2. Preparation of tobacco extract (water extraction)
150 g of mesophyll was removed from the package obtained in 1-1 above (using Japanese burley or Brazilian burley) and placed in a 2500 ml sealed stainless steel container. Next, 1500 ml of distilled water was added to the container, and the mixture was extracted for 3 hours in a sealed warm bath at 40°C with stirring. After extraction, the water and the extraction residue were separated using a stainless steel mesh with a mesh size of 250 μm, yielding approximately 2000 ml of extract. 100 ml of the resulting extract was removed, and 100 ml of ethyl acetate was added to the extract to perform liquid-liquid extraction. The resulting organic phase was concentrated using a rotary evaporator to obtain a concentrated, dried product (hereinafter referred to as "Sample 3") in a yield of approximately 1.3 to 1.5 wt %.

Then, samples 1 to 4 obtained in 1-2-1 and 1-2-2 above were dissolved in the same solvent as used for extraction so that the dry matter concentration was 4.0% by weight, and the resulting solutions were designated as samples 1 to 4 for GC analysis, respectively, as described below.

1-3. Preparation of Tobacco Sheet 1-3-1. Laminated Sheet 8.8 g of pulp and 8.8 g of CMC (carboxymethyl cellulose) were added to 113 g of citrus fiber (Helbacell AQ Plus CF-D, manufactured by Sumitomo Pharma & Chemical Co., Ltd.), and the mixture was stirred for 2 minutes in a mixer to obtain a mixture. 50 g of water and 19.3 g of glycerin were added to the mixture, and the mixture was stirred for 2 minutes in a mixer to obtain a mixture. The mixture was kneaded using an extruder. This kneading process was repeated a total of three times to obtain a kneaded product. The kneaded product obtained as described above was passed through a calendar roll with a gap set to 0.1 mm, formed into a sheet, and then dried in a hot air dryer at 80°C for 5 minutes to obtain a base sheet. To the obtained base sheet, the dried products obtained in 1-2-1 and 1-2-2 above were added so as to be 5000 ppm, to obtain a laminate sheet, which was used as a sample for sensory evaluation described below.
Hereinafter, the laminate sheet obtained using the dried product obtained by hexane extraction (sample 2) will be referred to as sample 5.

1-3-2. Scented Sheet Glycerin, hydroxypropyl cellulose (trade name: Celny, manufactured by Nippon Soda Co., Ltd.), plant fiber (citrus fiber, trade name: Helbacell AQ Plus CF-D, manufactured by Sumitomo Pharma & Chemical Co., Ltd.), and propylene glycol to which the dried products obtained in 1-2-1 and 1-2-2 above had been added were blended in a mass ratio of 8:7:4:1, and water was added to prepare an aqueous solution (water content: approximately 7% by mass). This aqueous solution was then applied to a nonwoven fabric (trade name: Taiko TCF, manufactured by Futamura Chemical Co., Ltd.) and dried at 80°C for 45 minutes in a hot air dryer to obtain a scented sheet, which was used as a sample for sensory evaluation as described below. The amount of the dried product added to the propylene glycol was adjusted so that the amount of the dried product in the final scented sheet was 5,000 ppm.

2. Measurement of Tobacco Essential Oil Components 2-1. Preparation of Sample for GC Analysis 5.0 g of the laminated sheet of Sample 5 obtained in 1-3-1 above was weighed and placed in a 100 ml sealed glass container. Next, 45 ml of ethyl acetate (Fujifilm Wako Pure Chemical Industries, Ltd., for high performance liquid chromatography) was added to the container, and the container was sealed and left to stand at room temperature for approximately 12 hours for extraction. After extraction, the mixture was filtered using filter paper (Advantec 5A) to separate the ethyl acetate solution from the extraction residue, yielding approximately 40 ml of ethyl acetate solution (ethyl acetate extract).

Next, approximately 5 g of anhydrous sodium sulfate was added to the ethyl acetate extract, and the mixture was dehydrated by gently shaking in a sealed container for approximately 1 hour. The dehydrated extract was then filtered to separate the solid from the liquid, and the solid was repeatedly washed with fresh ethyl acetate. The washed liquid and extract solution were collected in a 200 ml recovery flask. Ethyl acetate was removed from the liquid in the recovery flask using a rotary evaporator, yielding approximately 300 mg of dried material. Finally, ethyl acetate was added so that the concentration of the dried material was 4.0 wt%, and Sample 5 for GC analysis was obtained.

GC analysis was carried out using the GC analysis samples 1 to 3 and 5 obtained as described above under the conditions shown below (Component Identification by GC/MS). GC analysis was carried out with N=5. The GC charts of samples 1 to 3 and 5 are shown in Figures 3 to 6, respectively.
(Component identification by GC/MS)
Column: HP-5MS (30 m x 0.25 mm x 0.25 μm)
Oven: 40°C for 3 minutes → Heat at 4°C/min → 280°C for 20 minutes Detector: MS
Inlet: Split (10:1), 270°C
Injection volume: 1μl
Flow rate: 1 ml/min (constant flow mode)

2-2. Retention Index (RI)
Commercially available standard saturated alkane standards (Merck C7-C40) were diluted with hexane, and the RI was determined using hexane (C6) to tetracontane (C40) as indicators.
The linear retention index RI was calculated based on the following formula:
RI = 100 × {[(tr(unknown) - tr(n)] / [tr(N) - tr(n)] + n}
n = number of carbon atoms in the n-alkane eluting immediately before the unknown component N = number of carbon atoms in the n-alkane eluting immediately after the unknown component tr = retention time As an example, the relationship between the gas chromatograph of domestic burley leaves (top) and a saturated alkane standard (bottom) is shown in Figure 7.
Table 1 below shows the retention times and retention indices (DB-5) of the analyzed saturated alkane standards (column: DB-5 used).

3. Evaluation Results by GC Analysis GC analysis was performed using GC analysis samples 1 to 5 obtained as described above under the conditions shown below (Peak Balance by GC/FID Analysis). The sum of the peak areas of component H having an RI of 1800 to 3100, H, and the sum of the peak areas of component L having an RI of 1365 or more but less than 1800, L x 10/H (L/H ratio), were calculated. Furthermore, the peak area P of phytol having an RI of 2114 was determined, and L/P (also referred to as the "L/P ratio") was calculated. In measuring the L/H and L/P ratios, samples 1 to 3 and 5, which were derived from dried green leaves, were measured four times using Japanese burley and four times using Brazilian burley, for a total of eight times. Meanwhile, sample 4, which was derived from dried burley leaves, was measured four times using Brazilian burley. The average values and their amplitudes were then calculated. In addition, in samples 1 to 3 and 5, the L/H ratio and L/P ratio when Japanese burley was used were equivalent to those when Brazilian burley was used, and no significant difference was observed.
Graphs of the calculated L and H are shown in Figures 8 and 9, respectively. Data on the L/H ratio and L/P ratio are also summarized in Table 2 below. Peak areas were calculated after baseline correction (the same applies hereinafter). Samples 1, 2, and 5 correspond to Examples, and Samples 3 and 4 correspond to Comparative Examples.
(Peak balance by GC/FID analysis)
Column: HP-5MS (30 m x 0.25 mm x 0.25 μm)
Oven: 40°C for 3 minutes → Heat at 4°C/min → 280°C for 20 minutes Detector: FID
Inlet: Split (10:1), 270°C
Injection volume: 1μl
Flow rate: 1 ml/min (constant flow mode)

As shown in Figures 8 and 9 and Table 2, Sample 1 and Sample 2, which were made from green dried leaves and used ethyl acetate and hexane as extraction solvents, respectively, were found to have small amounts of component L (RI of 1365 or more but less than 1800) extracted and large amounts of component H (RI of 1800 to 3100) extracted, resulting in a condition of 0 < L/H ratio (L x 10/H) ≤ 0.55. In particular, Sample 2 was found to have a smaller amount of component L extracted and a larger amount of component H extracted, and a smaller L/H ratio, compared to Sample 1. These results demonstrate that hexane can selectively extract a larger amount of component H than ethyl acetate.
On the other hand, sample 3, which used green dried leaves and distilled water as the extraction solvent, extracted a large amount of component L and a small amount of component H, resulting in an L/H ratio significantly exceeding 0.55.
Furthermore, sample 4, which used dried burley leaves and hexane as the extraction solvent, extracted a relatively large amount of component H, but also a large amount of component L, resulting in an L/H ratio of over 0.55. These results demonstrate that when dried burley leaves are used, component L is extracted in large amounts along with component H, making it difficult to selectively extract component H even when hexane is used.

Furthermore, as shown in Figures 8 and 9 and Table 2, Sample 5, a laminated sheet prepared using tobacco extract extracted with hexane from green dried leaves, had a low amount of component L extracted and a high amount of component H extracted, similar to Sample 2, and as a result, it was found to satisfy the condition 0 < L/H ratio ≦ 0.55.

As shown in Table 2, the L/P ratios of samples 1 to 5 showed a similar trend to the L/H ratio. For sample 3, which used distilled water as the extraction solvent, as shown in Figure 8, a large amount of component L was extracted, and because phytol has low solubility in water, the amount of phytol extracted was very small, resulting in an extremely high L/P ratio.

4. Confirmation of the effects of non-combustion heating smoking articles (sensory evaluation)
4-1. Evaluation of Flavor (Softness/Mouthfeel) for Different Drying Methods and Different Extraction Methods 4-1-1. Preparation of Samples for Sensory Evaluation Dried Brazilian burley leaves (hereinafter referred to as dried burley leaves) produced by a standard method were prepared, and the dried burley leaves were separated into mesophyll and vein portions using a thresher in the same manner as in 1-1 above to obtain the mesophyll portion. The obtained mesophyll portion was treated in the same manner as the treatment of green dried leaves with ethyl acetate in 1-2-1 above to obtain a dried product.
The packed material obtained in 1-1 (using Brazilian burley) was treated in the same manner as in 1-2-1 above to obtain a dry product from the hexane-extracted solid and a dry product from the ethyl acetate-extracted solid. Furthermore, the packed material obtained in 1-1 (using Brazilian burley) was treated in the same manner as in 1-2-2 above to obtain a dry product from water extraction.
Each dried product obtained as described above was added to the base sheet obtained as described in 1-3-1 above so as to give a concentration of 5000 ppm to obtain a laminate sheet. Details of the obtained laminate sheet are summarized in Table 3.
A scented sheet was also obtained in the same manner as in 1-3-2 above, except that the dried product (green dried leaves) from the ethyl acetate-extracted solid obtained above was used. The amount of the dried product was adjusted to 5000 ppm relative to the final scented sheet.

5.0 g of each laminated sheet or scented sheet obtained as described above was weighed out and placed in a 100 ml sealed glass container. The subsequent procedures were the same as those in 2-1 above, and finally, a GC analysis sample derived from each laminated sheet or scented sheet was obtained. GC analysis was performed using the GC analysis sample obtained in this manner in the same manner as in 3 above, and the L/H ratio and L/P ratio were calculated. Table 3 summarizes the data for the L/H ratio and L/P ratio.
In Table 3, levels 1, 3, and 4 correspond to examples, and the control and level 2 correspond to comparative examples.

Furthermore, each laminated sheet or scented sheet obtained as described above was cut into cut widths of 0.8 mm. A non-combustion heating smoking article as shown in Figure 1 was prepared. The tobacco segment 20A had a length of 20 mm, the cooling section 20B had a length of 20 mm, and the filter section 20C had a length of 7 mm. 0.3 g of the above-mentioned shreds was filled into each tobacco segment 20A.

4-1-2. Sensory Evaluation The smoking articles were heated using a heating device (Ploom X, manufactured by Japan Tobacco Inc.) and subjected to smoking evaluation by a panel of 10 well-trained experts. The softness/mouthfeel during smoking was evaluated using the following five-point scale. The results are shown in Table 4 below.
1 Not very soft 2 Not soft 3 Standard 4 Soft 5 Very soft

As shown in Table 4, the ethyl acetate extract of green dried leaves (Level 3) exhibited a very soft flavor compared with the ethyl acetate extract of ordinary dried burley leaves (control). Furthermore, the sample (Level 1) in which hexane was used as the solvent for the green leaf extraction exhibited a softer flavor than the sample (Level 3) in which ethyl acetate was used. Furthermore, the sample (Level 2) in which water was used as the solvent for the green leaf extraction failed to achieve the desired soft flavor compared to ordinary dried burley leaves (control), even though green dried leaves were used as the raw material.
The scented sheet (Level 4) using the ethyl acetate extract of green dried leaves exhibited a flavor equivalent to that of the laminated sheet (Level 3) using the ethyl acetate extract of green dried leaves. Thus, there was no significant difference in flavor due to the difference in the sheet preparation method.

4-2. Evaluation of mint flavor with different extraction solvents 4-2-1. Preparation of samples for sensory evaluation A dried product of ethyl acetate extraction of dried burley leaves, a dried product of ethyl acetate extraction of dried green leaves, and a dried product of hexane extraction of dried green leaves obtained in 4-1-1 above were prepared.
Each of the above dried products was added to the base sheet obtained in the manner described in 1-3-1 above so as to give a concentration of 5000 ppm to obtain a laminate sheet. Details of the obtained laminate sheet are summarized in Table 5.

5.0 g of each laminate sheet obtained as described above was weighed and placed in a 100 ml sealed glass container. The subsequent procedures were the same as those in 2-1 above, and finally, GC analysis samples derived from each laminate sheet were obtained. GC analysis was performed using the GC analysis samples obtained in this manner in the same manner as in 3 above, and the L/H ratio and L/P ratio were calculated. Table 5 summarizes the data for the L/H ratio and L/P ratio.
In Table 5, levels 5 and 6 correspond to the examples, and the control corresponds to the comparative example.

Furthermore, each laminate sheet obtained as described above was cut to a cut width of 0.8 mm. A non-combustion heating smoking article as shown in Figure 1 was prepared. The tobacco segment 20A had a length of 20 mm, the cooling section 20B had a length of 20 mm, and the filter section 20C had a length of 7 mm. 0.3 g of the shredded tobacco was filled into each tobacco segment 20A. After filling with the shredded tobacco, an equal amount (500 ppm) of peppermint flavor was added to each tobacco segment 20A (flavor section) using a microsyringe.

4-2-2. Sensory Evaluation The smoking articles were heated using a heating device (Ploom X, manufactured by Japan Tobacco Inc.) and subjected to smoking evaluation by a panel of 10 well-trained experts. The expression/intensity of the mint aroma during smoking was evaluated using the following five-point scale. The results are shown in Table 6 below.
1. Very poor mint aroma expression 2. Poor mint aroma expression 3. Standard 4. Good mint aroma expression 5. Very good mint aroma expression

As shown in Table 6, the extracts of green dried leaves (Levels 5 and 6) showed a better mint aroma than the extract of ordinary dried burley leaves (control).
Furthermore, for the extracts of green dried leaves, the hexane extract (level 6) produced a slightly better mint aroma than the ethyl acetate extract (level 5).

10 heating device 11 body 12 heater 13 metal tube 14 battery unit 15 control unit 16 recess 17 ventilation hole
20 Non-combustion heating smoking article 20A Tobacco segment 20B Cooling section 20C Filter section
21 tobacco filler 22 wrapper 23 paper tube 24 perforation 25 first segment 25a first filling layer 25b inner plug wrapper 26 second segment 26a second filling layer 26b inner plug wrapper 27 outer plug wrapper 28 mouthpiece lining paper

Claims (12)

The sum of the peak areas of components having a retention index (RI) of 1800 to 3100 in gas chromatography is designated as H,
When the sum of the peak areas of the components having an RI of 1365 or more and less than 1800 is L,
0<L×10/H≦0.55
fulfill,
Tobacco extract. 0<L×10/H≦0.30
The tobacco extract according to claim 1 , which satisfies the above. When the peak area of phytol having an RI of 2114 is P,
0<L/P≦1.2
The tobacco extract according to claim 1 or 2, which satisfies the above. (A) A tobacco filler comprising the tobacco extract according to any one of claims 1 to 3. The tobacco filler according to claim 4, wherein the tobacco filler contains 0.1 to 5% by weight of (A). The tobacco filler according to claim 4 or 5, further comprising (B) non-pulp fibers and (C) a binder. The tobacco filler according to claim 6, wherein the tobacco filler contains 15 to 50% by weight of (B) and (C) in total. (D) A tobacco filler according to any one of claims 4 to 7, further comprising an aerosol source. The tobacco filler according to claim 8, wherein the tobacco filler contains 10 to 60% by weight of (D). A non-combustion heating smoking article comprising the tobacco filler described in any one of claims 4 to 9. (1) providing a tobacco-derived material;
(2) subjecting the raw material to solid-liquid extraction using an organic solvent;
(3) recovering the organic phase from step (2); and (4) removing the solvent from the organic phase to obtain a tobacco extract. The harvested tobacco leaves are subjected to one or more of the following drying processes:
(i) drying the tobacco leaves at a relative humidity of 15 to 70% and a temperature of 35 to 80°C for 40 to 100 hours from the initial stage; and (ii) subjecting the tobacco leaves to a step of drying using microwaves to prepare a tobacco-derived raw material.
The method of claim 11.