Method of extracting volatile compounds from tobacco material
There is provided a method of extracting one or more volatile compounds of interest from tobacco material, the method comprising the steps of: i) providing tobacco material; ii) subjecting the tobacco material to steam distillation; and iii) extracting one or more volatile compounds of interest from the tobacco material with a solvent; wherein distillation step (ii) and extraction step (iii) are carried out simultaneously and at a pH of no greater than 2, and wherein the period during which both the distillation step (ii) and the extraction step (iii) are carried out is from about 8 to about 20 hours.
1. A method of extracting one or more volatile compounds of interest from tobacco material, the method comprising the steps of:
i) providing tobacco material;
ii) subjecting the tobacco material to steam distillation; and
iii) extracting one or more volatile compounds of interest from the tobacco material with a solvent, wherein the solvent is a mixture of pentane and diethyl ether;
wherein distillation step (ii) and extraction step (iii) are carried out simultaneously and at a pH of no greater than 2, and wherein the period during which both the distillation step (ii) and the extraction step (iii) are carried out is from about 8 to about 20 hours.
2. The method according to claim 1 , wherein the distillation step (ii) and extraction step (iii) are carried out at a pH of no greater than 2 for the total period of time for which said steps are carried out.
3. The method according to claim 1 , wherein the solvent comprises a mixture of pentane and ethyl ether in a weight ratio of pentane to ethyl ether of 3:1 to 1:1.
4. The method according to claim 1 , wherein the distillation step (ii) and extraction step (iii) are carried out at a pH of from 0.5 to 2.
5. The method according to claim 1 , wherein the period during which both the distillation step (ii) and the extraction step (iii) are carried out is from about 8 to about 10 hours.
6. The method according to claim 1 , wherein the distillation step (ii) and the extraction step (iii) are carried out at a temperature of up to about 130° C.
7. The method according to claim 1 , wherein the tobacco material does not undergo any heat treatment before distillation step (ii) and extraction step (iii) are carried out.
8. The method according to claim 1 , wherein the one or more volatile compounds of interest are selected from the group consisting of: sugars, sugar esters, amino acids, beta-carotene, violaxanthin, lutein, neoxanthin, phytol, labdanoids, cembranoids, polyphenols, lignin and mixtures thereof.
9. The method according to claim 1 , wherein the method further comprises a purifying step which comprises replacing the solvent used for extraction with another solvent suitable for use in a tobacco product.
10. The method according to claim 9 , wherein the solvent suitable for use in a tobacco product is ethanol.