The biotransformation of (-)-epicatechin 3-O-gallate (1) and related compounds was undertaken using a human fecal suspension. Of fifteen metabolites isolated, four compounds were new, namely, two epimers of 1-(3'-hydroxyphenyl)-3-(2", 4", 6"-trihydroxyphenyl)propan-2-ols (6, 19); 2", 3"-dihydroxyphenoxyl 3-(3', 4'-dihydroxyphenyl)propionate (14) and 1-(3', 4'-dihydroxyphenyl)-2-(2", 4", 6"-trihydroxyphenyl)propan-2-ol (18).(-)-Epicatechin (2), (-)-epigallocatechin (16) and their 3-O-gallates (1, 17) were extensively metabolized by a human fecal suspension after incubation for 24h, whereas the gallates (1, 17) resisted any degradation by a rat fecal suspension, even after a prolonged incubation time (48h), suggesting a difference in metabolic ability between two intestinal bacterial mixtures from different species.
利用人体粪便悬浮液对(-)-
表儿茶素 3-O-
没食子酸酯(1)及相关化合物进行了
生物转化。在分离出的 15 种代谢物中,有 4 种是新化合物,即 1-(3'-羟基苯基)-3-(2", 4", 6"-三羟基苯基)丙-2-醇的两种表聚物(6, 19);2",3"-二羟基苯氧基 3-(3',4'-二羟基苯基)
丙酸酯 (14) 和 1-(3',4'-二羟基苯基)-2-(2",4",6"-三羟基苯基)丙-2-醇 (18)。(-)-
表儿茶素(2)、
(-)-表没食子儿茶素(16)及其 3-O
没食子酸酯(1、17)在培养 24 小时后被人粪便悬浮液广泛代谢,而
没食子酸酯(1、17)即使在延长培养时间(48 小时)后也不会被大鼠粪便悬浮液降解,这表明来自不同物种的两种肠道细菌混合物的代谢能力存在差异。