Thirteen flavonoids were isolated from the fresh sweet fruit of Averrhoa carambola L. (Oxalidaceae), commonly known as star fruit, and their structures were determined by spectroscopic and chemical methods. 8-Carboxymethyl-(+)-epicatechin methyl ester, pinobanksin 3-O-β-d-glucoside, and carambolasides M-Q were undescribed structures. (+)-Epicatechin, aromadendrin 3-O-β-d-glucoside, helicioside A, taxifolin 3'-O-β-d-glucoside, galangin 3-O-rutinoside, and isorhamnetin 3-O-rutinoside were reported from this species for the first time. Pinobanksin 3-O-β-d-glucoside and carambolasides M-Q showed more potent 2,2'-azinobis-(3-ethylbenzthiazoline-6-sulphonic acid) (ABTS) radical cation scavenging activity (IC50 = 5.3-2.3 μM) than l-ascorbic acid (10.5 μM). Further, (+)-epicatechin, pinobanksin 3-O-β-d-glucoside, isorhamnetin 3-O-rutinoside, and carambolasides O-Q exhibited weak porcine pancreatic lipase inhibitory activity.

中文翻译：

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从杨桃新鲜甜果中分离的黄酮类化合物，俗称杨桃

从杨桃科（Averrhoa carambola L. (Oxalidaceae)，俗称杨桃）的新鲜甜果中分离出13种黄酮类化合物，并通过光谱和化学方法确定了它们的结构。8-羧甲基-(+)-表儿茶素甲酯、pinobanksin 3-O-β-d-葡萄糖苷和杨桃苷 MQ 是未描述的结构。(+)-表儿茶素、香树素 3-O-β-d-葡萄糖苷、螺旋藻苷 A、紫杉叶素 3'-O-β-d-葡萄糖苷、高良姜素 3-O-芸香苷、异鼠李素 3-O-芸香苷第一次种。Pinobanksin 3-O-β-d-葡萄糖苷和杨桃苷 MQ 显示出比 l 更有效的 2,2'-azinobis-(3-ethylbenzthiazoline-6-sulphonic acid) (ABTS) 自由基阳离子清除活性 (IC50 = 5.3-2.3 μM) -抗坏血酸 (10.5 μM)。此外，(+)-表儿茶素、松香素 3-O-β-d-葡萄糖苷、异鼠李素 3-O-芸香苷、