# US 10,306,914 B2 · Oral tobacco composition and production method thereof

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- Number: US 10,306,914 B2
- Document ID: US10306914B2
- Status: Granted
- Kind: B2
- Application number: 15/493,733
- Filed: 2017-04-21
- Published: 2017-08-10
- Granted: 2019-06-04
- Earliest claimed: 2014-10-24
- Assignees: Japan Tobacco Inc.
- Applicants: Japan Tobacco Inc.
- Inventors: Kimitaka Uchii; Takuma Nakano
- Web page: https://patentgrep.com/patent/US10306914B2

## CPC

- A24B 15/10: Chemical features of tobacco products or tobacco substitutes
- A24B 13/00: Tobacco for pipes, for cigars, e.g. cigar inserts, or for cigarettes; Chewing tobacco; Snuff (reconstituted tobacco products A24B3/14)
- A24B 15/18: Treatment of tobacco products or tobacco substitutes
- A24B 15/245: {Nitrosamines}
- A24B 15/32: by acyclic compounds
- A24B: MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF

## Abstract

An oral tobacco composition is provided which has a 0.06 or greater ratio (A/N) of the total amount of carboxylic acid with 6 or fewer carbon atoms to the nicotine content, and which has a 20 ng or lower TSNA content per 1 mg of nicotine.

## Claims

### Claim 1

An oral tobacco composition, wherein a molar ratio (A/N ratio) of total content of carboxylic acid having carbon number of six or less with respect to content of nicotine is 0.06 to 2.00, and content of tobacco-specific nitrosamines (hereafter referred to as TSNA) per 1 mg of nicotine is 20 ng or less.

### Claim 2 (depends on 1)

The oral tobacco composition according to claim 1, wherein the A/N ratio is 0.20 to 2.00.

### Claim 3 (depends on 1)

The oral tobacco composition according to claim 1, wherein the A/N ratio is 1.30 to 2.00.

### Claim 4 (depends on 1)

The oral tobacco composition according to claim 1, wherein pH of the oral tobacco composition is 8.0 to less than 10.0.

### Claim 5 (depends on 1)

The oral tobacco composition according to claim 1, wherein the carboxylic acid having carbon namber of six or less is one or more acids selected from the group consisting of malic acid, citric acid, succinic acid, acetic acid, formic acid, levulinic acid, pyruvic acid, tartaric acid, adipic acid, lactic acid, butyric acid and glutamic acid.

### Claim 6 (depends on 1)

The oral tobacco composition according to claim 1, wherein the carboxylic acid having carbon number of six or less is one or more acids selected from the group consisting of malic acid, citric acid, succinic acid, acetic acid and formic acid.

### Claim 7

A method for producing an oral tobacco composition containing a tobacco material obtained through steps a) to f) below, the obtained tobacco material having properties (i) and (ii) below, and
the method comprising:
a) step of adding a basic substance to a tobacco material;
b) step of heating the tobacco material, to which the basic substance has been added, to cause a flavor component in the tobacco material to be released into a gas phase;
c) step of recovering, in a collecting solvent, the flavor component having been released into the gas phase;
d) step of washing, by using a washing solvent, the tobacco material from which the flavor component has been released, to remove thereby an acidic substance remaining in the tobacco material;
e) after the step d), a step of adding a carboxylic acid having carbon number of six or less to the tobacco material, or a step of adding a carboxylic acid having carbon number of six or less to the collecting solvent of the step c); and
f) step of, after the step e), returning the flavor component recovered in the step c) to the tobacco material,
(i) a molar ratio (A/N ratio) of total content of carboxylic acid having carbon number of six or less and content of nicotine is 0.06 or higher; and
(ii) content of TSNA per 1 mg of nicotine is 20 ng or less.

### Claim 8 (depends on 7)

The production method according to claim 7, wherein the basic substance comprises an alkali metal salt of weak acid.

### Claim 9 (depends on 8)

The production method according to claim 8, wherein the alkali metal salt of weak acid is an alkali metal salt of carbonic acid.

### Claim 10 (depends on 7)

The production method according to claim 7, wherein the washing solvent is water and/or carbonated water or an aqueous solution containing supersaturated CO2 gas.

### Claim 11 (depends on 7)

The production method according to claim 7, wherein in the step a) the basic substance is added to the tobacco material so that pH of the tobacco material reaches a range of 8.9 to 9.7.