作者:Akiko Takagaki、Fumio Nanjo
DOI:10.1021/jf903375s
日期:2010.1.27
5′-trihydroxyphenyl)-3-(2′′,4′′,6′′-trihydroxyphenyl)propan-2-ol (3) by reductive cleavage between 1 and 2 positions of EGC, and subsequently metabolite 3 was converted to 1-(3′,5′-dihydroxyphenyl)-3-(2′′,4′′,6′′-trihydroxyphenyl)propan-2-ol (4) followed by the conversion to 5-(3,5-dihydroxyphenyl)-4-hydroxyvaleric acid (5) by decomposition of the phloroglucinol ring in metabolite 4. This degradation pathway
体外研究了大鼠肠道细菌对(-)-表没食子儿茶素没食子酸酯(EGCg)的厌氧代谢。首先,用169株肠细菌筛选出能够将EGCg水解为(-)-表没食子儿茶素(EGC)和没食子酸(2)的肠细菌。结果,产生了产气肠杆菌,植物拉乌尔氏菌,肺炎克雷伯菌。肺炎和长双歧杆菌亚种。发现婴儿可以水解EGCg。EGCg代谢的后续步骤是EGC的降解(1)被肠道细菌感染。然后,将EGC与大鼠肠道细菌在0.1 M磷酸盐缓冲液(pH 7.1)中温育,并通过HPLC或LC-MS对降解产物进行时间分析。此外,由EGC形成的产物被分离并通过LC-MS和NMR分析鉴定。结果表明,EGC首先通过以下方法转化为1-(3',4',5'-三羟基苯基)-3-(2'',4'',6''-三羟基苯基)丙-2-醇(3)在EGC的1和2位之间进行还原性裂解,随后将代谢物3转化为1-(3',5'-二羟基苯基)-3-(2'',4'',6''-三羟基苯基)丙烷-2-