期刊
BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY
卷 68, 期 9, 页码 1984-1987出版社
TAYLOR & FRANCIS LTD
DOI: 10.1271/bbb.68.1984
关键词
Zanthoxylum piperitum; quercetin; quercitrin; tyrosinase; Streptomyces bikiniensis
Two flavonols, quercetin (1) and quercitrin (2), were isolated from the leaves of Zanthoxylum piperitum. Their structures were established by UV, one- and two-dimensional NMR, and mass spectroscopic methods. Quercetin showed significant inhibition against mushroom tyrosinase with an IC50 value of 3.8 mug/ml, and appeared to inhibit the polyphenol oxidase activity of tyrosinase in a competitive manner (Ki = 10 +/- 0.20 muM) when L-tyrosine was used as a substrate, although it did not inhibit the melanin production of Streptomyces bikiniensis.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据