Ground tobacco composition

Abstract

Embodiments described herein include a ground tobacco composition, wherein at least 90% by weight of the tobacco in the composition has a particle size in the range of about 200 μm to about 5 mm.

Claims

1. A method of preparing a tobacco extract from a ground tobacco composition, wherein at least 90% by weight of the tobacco in the composition has a particle size in the range of about 200 μm to about 5 mm, and wherein the ground tobacco composition is contacted with an extraction solvent comprising an aerosol generating agent selected from the group consisting of glycerol, propylene glycol, triacetin and isopropyl myristate.

2. The method of claim 1, wherein at least 90% by weight of the tobacco in the composition has a particle size in the range of about 355 μm to about 3.5 mm.

3. The method of claim 1, wherein at least 95% by weight of the tobacco has a particle size in the range of about 200 μm to about 5 mm.

4. The method of claim 1, the method comprising the steps of: (a) grinding tobacco; (b) removing tobacco particles that are larger than the particle size range using a first sieve; and (c) removing tobacco particles that are smaller than the particle size range using a second sieve.

5. The method of claim 1, wherein at least 97% by weight of the tobacco has a particle size in the range of about 200 μm to about 5 mm.

Description

DETAILED DESCRIPTION

(1) The invention provides a ground tobacco composition, wherein at least 90% by weight of the tobacco in the composition has a particle size in the range of about 200 μm 5 to about 5 mm. In some cases, at least 90% by weight of the tobacco in the composition as a particle size that exceeds about 250 μm, 300 μm, 330 μm or 355 μm. In some cases, at least 90% by weight of the tobacco in the composition has a particle size that is less than about 4.5 mm, 4 mm or 3.5 mm. For instance, in some cases at least 90% by weight of the tobacco in the composition has a particle size in the range of about 300 μm to about 4 mm, suitably from about 355 μm to about 3.5 mm.

(2) As used herein, reference to a lower particle size limit means that the tobacco particles will not pass through a sieve with a mesh size of that lower limit. For instance, restriction of the particle size to be greater than 200 μm means that the particles are retained on a sieve with a 200 μm mesh. Similarly, restriction of the particle size to be greater than 355 μm means that the particles are retained on a sieve with a 355 μm mesh.

(3) As used herein, reference to an upper particle size limit means that the tobacco particles will pass through a sieve with a mesh size of that upper limit. For instance, restriction of the particle size to be less than 5 mm means that the particles are not retained on a sieve with a 5 mm mesh (i.e. they pass through a 5 mm mesh sieve). Similarly, restriction of the particle size to be less than 3.5 mm means that the particles are not retained on a sieve with a 3.5 mm mesh (i.e. they pass through a 3.5 mm mesh sieve).

(4) In some cases at least 95% by weight of the tobacco in the composition has a particle size in the specified range, and suitably at least 97%, 98%, 99% or 99.5% by weight of the tobacco in the composition has a particle size in the specified range. In some cases, substantially all of the tobacco in the composition has a particle size in the specified range. In some cases, 100% by weight of the tobacco in the composition has a particle size in the specified range.

(5) The ground tobacco composition is particularly suitable for use in the preparation of a tobacco extract. Any suitable extraction solvent may be used. In some cases, the extraction solvent may be an aerosol generating agent, so that the tobacco components are dissolved and retained in the aerosol generating agent. A tobacco extract formed using an aerosol generating agent as a solvent can be incorporated directly into an electronic cigarette or the like (or a cartridge configured for use with an electronic cigarette). In other cases, the extraction solvent may be, for example, a supercritical fluid, such as supercritical carbon dioxide. Where the extraction solvent is not an aerosol generating agent, the method of preparing a tobacco extract according to the invention may include a solvent switch in which the dissolved tobacco components are transferred from the extraction solvent to an aerosol generating agent. As used herein, an “aerosol generating agent” is an agent that promotes the generation of an aerosol on heating. An aerosol generating agent may promote the generation of an aerosol by promoting an initial vaporization and/or the condensation of a gas to an inhalable solid and/or liquid aerosol.

(6) In general, suitable aerosol generating agents include, but are not limited to: a polyol such as sorbitol, glycerol, and glycols like propylene glycol or triethylene glycol; a non-polyol such as monohydric alcohols, high boiling point hydrocarbons, acids such as lactic acid, glycerol derivatives, esters such as diacetin, triacetin, triethylene glycol diacetate, triethyl citrate or myristates including ethyl myristate and isopropyl myristate and aliphatic carboxylic acid esters such as methyl stearate, dimethyl dodecanedioate and dimethyl tetradecanedioate. In some cases, the aerosol generating agent comprises one or more of glycerol, propylene glycol, triacetin and isopropyl myristate, suitably glycerol and/or propylene glycol.

EXAMPLE

(7) The tobacco moisture content should be in the range of 0-30% by weight, ideally 12-16% by weight. Tobacco was fed into a ball mill type grinder, Urschel Comitrol 3600 with a 3 mm round cutting head.

(8) The particles were then sieved to select particles of the desired size. The ground tobacco was then separated using two sieves; a first, upper sieve with a 3.5 mm mesh size and a second, lower sieve with a 0.355 mm mesh size. Tobacco particles retained on the top sieve can be retained and returned to the grinder later. Tobacco particles retained on the lower sieve were retained as the sample for extraction. Tobacco particles passing through both sieves were discarded. The equipment used for sieving is a Russell Finex 17300 sieve.

(9) Comparison of the starting tobacco material (pre-grinding) with the tobacco particles of sample for extraction shows there is no loss of nicotine or water during the processing steps. Further, the metal content of the starting tobacco material and the tobacco particles of Sample A is the comparable; there is not metal leaching from the processing apparatus into the tobacco.

(10) Moreover, samples taken from different parts of a tobacco leaf were determined to have significant variations in the relative concentrations of various tobacco components. The ground tobacco of the sample for extraction was found to have reduced variation in the concentration of these components as compared to the tobacco leaf.

(11) Chemical and Physical Analysis

(12) Various tests were completed using Virginia tobacco and, separately, Burley Tobacco. The tests were completed following grinding and the various size bands were selected using appropriate sieves. The data are shown below.

(13) a) Chemical Composition.

(14) It can be seen from Tables 1 and 2 below that the concentration of benzo[a]pyrene and toxic heavy metals is highest in tobacco extracts obtained using tobacco particles that are smaller than 355 μm.

(15) TABLE-US-00001 TABLE 1 Benzo[a]pyrene Leaf Type Particle size in extract (ng/g) Virginia 200-355 μm 116 355-710 μm 100  710-1400 μm 89.8 >1400 μm 90.8 All sizes 93.4 Burley 200-355 μm 5.26 355-710 μm 4.06  710-1400 μm 3.79 >1400 μm 3.79 All sizes 4.02

(16) TABLE-US-00002 TABLE 2 Concentration in extract (ng/g) Leaf Type Particle size Cd Pb Cr Ni As Se Hg Virginia 200-355 μm 962 870 1932 951 350 52.4 22.3 355-710 μm 786 238 402 369 70.4 41.7 18.6 710-1400 μm 788 262 329 345 58.7 42.1 17.8 >1400 μm 723 255 441 402 60 38 15.3 All sizes 747 244 411 373 80.4 42.6 16.1 Burley 200-355 μm 196 673 4001 1993 158 23.2 16.2 355-710 μm 220 156 646 868 38.4 32.4 16.9 710-1400 μm 198 159 542 799 37.8 29.2 14.8 >1400 μm 219 206 602 897 37.0 32.3 14.1 All sizes 206 269 1104 1018 73 32.5 15.4

(17) It can be seen from Table 3 below that the nicotine and moisture content was approximately equal for tobacco extracts obtained from all particle sizes.

(18) TABLE-US-00003 TABLE 3 Leaf Type Particle size Nicotine (mg/mL) Water (wt %) Virginia 200-355 μm 27.6 12.1 355-800 μm 31.0 13.2  800-2000 μm 31.6 13.6 >2000 μm 32.9 14.0 All sizes 33.3 13.7 Burley 125-355 μm 26.8 10.0 355-710 μm 31.4 12.2  710-1400 μm 31.7 12.7 >1400 μm 30.2 12.9 All sizes 31.9 12.3

(19) Tobacco extracts were formed by contacting tobacco particles with a 50:50 (w/w) mixture of glycerol and propylene glycol at 100° C. for 15 minutes. (The weight ratio of tobacco to solvent was 1:9). The nicotine concentration in the extracts was approximately the same for all particle size ranges used. The tobacco particle size does not affect the extract nicotine concentration.

(20) b) Size Distribution

(21) The particle size distribution following grinding was measured. The various size bands were selected using appropriate sieves.

(22) TABLE-US-00004 Leaf Type Particle size Wt % Virginia <200 μm 1.3 200-355 μm 1.4 355-710 μm 10  710-1400 μm 29.5 >1400 μm 57.8 All sizes 100 Burley <200 μm 1.4 200-355 μm 1.8 355-710 μm 17.4  710-1400 μm 42.3 >1400 μm 37.1 All sizes 100

(23) It can be seen that 2.7wt % of the Virginia tobacco and 3.2wt % of the Burley tobacco had a particle size of less than 355 μm.

(24) The various embodiments described herein are presented only to assist in understanding and teaching the claimed features. These embodiments are provided as a representative sample of embodiments only, and are not exhaustive and/or exclusive. It is to be understood that advantages, embodiments, examples, functions, features, structures, and/or other aspects described herein are not to be considered limitations on the scope of the invention as defined by the claims or limitations on equivalents to the claims, and that other embodiments may be utilized and modifications may be made without departing from the scope of the claimed invention. Various embodiments of the invention may suitably comprise, consist of, or consist essentially of, appropriate combinations of the disclosed elements, components, features, parts, steps, means, etc., other than those specifically described herein. In addition, this disclosure may include other inventions not presently claimed, but which may be claimed in future.