In the research on ellagitannin metabolism, two unique dehydroellagitannins, carpinins E (1) and F (2), bearing dehydrohexahydroxydiphenoyl (DHHDP) and hydrated biscyclohexenetrione dicarboxyl ester (HBCHT) groups, were isolated from young leaves of Carpinusjaponica. Upon heating in H2O or treatment with pH 6 buffer at room temperature, 1 and 2 afforded the reduction product 3, isocarpinin A, with
在鞣花单宁的代谢的研究,两个独特dehydroellagitannins,carpinins E(1)和F(2),轴承dehydrohexahydroxydiphenoyl(DHHDP)和水合biscyclohexenetrione二羧基酯(HBCHT)基团,是从嫩叶分离鹅耳枥粳稻。在 H 2 O 中加热或在室温下用 pH 6 缓冲液处理后,1和2提供还原产物3,异果皮素 A,带有 ( R )-六羟基二苯甲酰基 (HHDP) 基团,表明 ( S )-DHHDP 组。这得益于产量增加3在 pH 6 的缓冲溶液中,表没食子儿茶素-3 - O-没食子酸酯 ( 15 )共存,伴随着15的氧化。相比之下,用抗坏血酸处理1和2产生了4,carpinin A,具有 ( S )-HHDP 组。在与抗坏血酸一起加热时,HBCHT 基团也被还原为 ( S )-HHDP 基团,并且2转化为 2,3;4,6-bis(