Use of a phenol oxidising enzyme in the treatment of tobacco

C - Chemistry – Metallurgy – 12 – P

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C12P 7/22 (2006.01) A24B 15/20 (2006.01) A24B 15/24 (2006.01)

Patent

CA 2316249

A process for preparing tobacco, which process comprises the steps of treating a tobacco material with a phenol oxidising enzyme, such as by extracting tobacco with a solvent to provide an extract and a residue; and treating the extract with a phenol oxidising enzyme such as a laccase. An improved tobacco product having a reduced amount of phenolic compounds. This is an alternative or a supplement to a process in which the phenolic compounds are adsorbed onto the insoluble carrier polyvinylpolypyrrolidone (PVPP). In preferred embodiments, the process includes further steps of removing the oxidised phenolic compound, adding adsorbents such as bentonite; removing and/or inactivating the enzyme; and concentrating the extract. Preferred phenol oxidising enzymes are peroxidases and laccases. The thus treated extract is advantageously re-combined with the tobacco residue and further processed to provide a tobacco article for smoking.

Ce procédé de préparation du tabac comprend les étapes consistant à traiter du tabac avec une enzyme oxydant les phénols, comme par extraction du tabac à l'aide d'un solvant afin d'obtenir un extrait et un résidu, puis à traiter l'extrait à l'aide d'une enzyme oxydant les phénols, telle qu'une laccase. L'invention concerne donc un tabac amélioré possédant une teneur réduite en composés phénoliques. Ce procédé constitue une variante ou un procédé additionnel au processus dans lequel les composés phénoliques sont adsorbés sur un support insoluble du type polyvinylpolypyrrolidone (PVPP). Dans des modes de réalisation préférés, ce procédé comprend en outre les étapes consistant à enlever le composé phénolique oxydé, à ajouter des adsorbants tels que la bentonite, à enlever et/ou inactiver l'enzyme, puis à concentrer l'extrait. Des enzymes préférées d'oxydation des phénols sont des peroxydases et laccases. De manière avantageuse, on combine à nouveau l'extrait ainsi traité avec le résidu du tabac, et on procède à un traitement ultérieur pour obtenir un article de tabac destiné à être fumé.

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