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Short Paper | Special issue | Vol 95, No. 1, 2017, pp.540-546
Published online, 31st October, 2016
DOI: 10.3987/COM-16-S(S)15
Two New Galloyl Glucosides from the Bark of Castanopsis fargesiI

Yong Lin Huang,* Ya-Feng Wang, Jin-Lei Liu, Rui-jie He, Xiao-Jie Yan, Lei Wang, and Dian-Peng Li

*Guangxi Key Laboratory of Functional Phytochemicals Research and Utilization, Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, NO. 85 Yanshan Street, Guilin, Guangxi 541006, China

Abstract

In a continuing phytochemical investigation of the Castanopsis species (Fagaceae), two new galloyl glucosides, 5-O-β-D-(6'-O-galloyl)glucopyranosyl pyran-2-one (1) and 4-hydroxymethyl-2-methoxyphenol 1-O-β-D-(6'-O-galloyl)glucoside (2), were isolated from the ethanolic extract of the bark of Castanopsis fargesii, together with six known compounds. Their structures were elucidated on the basis of spectroscopic data analysis. The oxygen radical absorbance capacity (ORAC) values of the all compounds were measured and the known compound 4-hydroxy-2-methoxyphenol 1-O-β-D-(6'-O-galloyl)glucoside (3) showed the strongest antioxidant activity.