Hydrolysable tannins and proanthocyanidins from green tea |
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| Authors: | Gen-Ichiro Nonaka Ryo Sakai Itsuo Nishioka |
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| Institution: | Faculty of Pharmaceutical Sciences, Kyushu University 62, Maidashi Higashi-ku, Fukuoka 812, Japan |
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| Abstract: | Two hydrolysable tannins were isolated from green tea, and their structures were characterized by chemical and spectral means as 1,4,6-tri-O -galloyl-β-d-glucose and 1-O-galloyl-4,6-(?)-hexahydroxydiphenoyl-β-d-glucose. In addition, a new proanthocyanidin gallate was isolated, together with the known procyanidins B-2, B-4 and C-1. The structure of the proanthocyanidin was established as epigallocatechin-(4β → 8)-3-O-galloylepicatechin. |
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| Keywords: | Theaceae green tea ellagitannin gallotannin proanthocyanidin polyphenol |
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