オートクレーブ処理した茶葉および茶ドリンクのカテキン成分

概要

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Autoclaved tea leaves contained high concentrations of (-)-gallocatechin 3-O-gallate (GCG) and (-)-catechin 3-O-gallate (CG) which have been converted from (-)-epigallocatechin 3-O-gallate (EGCG) and (-)-epicatechin 3-O-gallate (ECG), respectively. Although the concentrations of GCG and CG in fresh tea leaves and commercial green tea were very low, those of the commercial tea drinks were high level almost similar to those of EGCG and ECG. GCG and CG in commercial tea drinks seemed to be produced in the manufacturing process. Autoclaved tea leaves obtained in this research would be a good materials containing C-2 catechin epimers (i. e. high amount of GCG and CG), which could be used in food and pharmaceutical industries.
2004-09-28