Combination treatment of tobacco extract using antioxidants and antioxidant scavengers
A process for treating a tobacco material comprising: (a) extracting a tobacco material with a solvent to produce a tobacco extract and a tobacco residue; (b) contacting the tobacco extract with an antioxidant; and (c) contacting the mixture of (b) with an antioxidant scavenger, to produce a treated tobacco extract. The treated tobacco extract is reapplied to the tobacco residue to form a treated tobacco material. In addition, a smoking composition, a smoking article and a smokeless tobacco oral delivery product contain the treated tobacco material.
1. A process for treating a tobacco material comprising:
(a) extracting a tobacco material with a solvent to produce a tobacco extract and a tobacco residue, wherein the tobacco extract comprises at least one nitrite compound;
(b) contacting the tobacco extract with an antioxidant, to produce a mixture having a reduced content of the at least one nitrite compound; and
(c) contacting the mixture with an antioxidant scavenger, thereby removing the antioxidant therein to produce a treated tobacco extract,
wherein the antioxidant comprises ascorbic acid.
2. The process of claim 1 , further comprising separating the antioxidant scavenger from the mixture in the contacting (c).
3. The process of claim 1 , further comprising applying the treated tobacco extract to the tobacco residue, following the contacting (c).
4. The process of claim 1 , further comprising removing a portion of the solvent in the treated tobacco extract, following the contacting (c).
5. The process of claim 1 , further comprising separating the tobacco residue from the tobacco extract, following the extracting (a) and prior to the contacting (b).
6. The process of claim 1 , wherein the extracting (a) is carried out at a temperature ranging from room temperature to about 160° F.
7. The process of claim 2 , wherein the separating is carried out by centrifugation, filtration, ultrafiltration, sedimentation, reverse osmosis, adsorption, decantation, or any combinations thereof.
8. The process of claim 1 , wherein the solvent comprises at least one selected from the group consisting of water, methanol, ethanol and ethylene glycol.
9. The process of claim 8 , wherein the solvent further comprises at least one of acetone and ether.
10. The process of claim 1 , wherein the antioxidant scavenger is insoluble in the tobacco extract.
11. The process of claim 1 , wherein the antioxidant scavenger comprises a polymer selected from the group consisting of polyvinylimidizole (PVI), polyvinylpyrrolidone (PVP), polyvinylpolypyrrolidone (PVPP), poly(vinylimidizole-co-vinylpyrrolidone) (PVI/PVP copolymer) and combinations thereof.
12. The process of claim 1 , wherein the antioxidant scavenger is capable of removing at least one metal selected from the group consisting of cadmium, nickel, iron, copper and aluminum from the tobacco extract.
13. A tobacco material treated by the process of claim 3 .
14. A smoking composition comprising a tobacco material treated by the process of claim 3 .
15. A smoking article comprising a rod of tobacco material treated by the process of claim 3 .
16. A smokeless tobacco material treated by the process of claim 3 .
17. The smokeless tobacco material of claim 16 , wherein the smokeless tobacco material is contained in a pouch comprising a porous material.