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Note | Regular issue | Vol 60, No. 11, 2003, pp.2557-2563
Published online, 16th September, 2003
DOI: 10.3987/COM-03-9882
■ Flavonol Glycosides in Two Diospyros Plants and Their Radical Scavenging Activity

Miyuki Furusawa, Tetsuro Ito, Ken-ichi Nakaya, Toshiyuki Tanaka,* Iliya Ibrahim, Munekazu Iinuma, Hiroko Murata, Yuka Inatomi, and Tsutomu Nakanishi

*Gifu Prefectrual Institute of Health and Environmental Sciences, 1-1 Nakafudogaoka, Kakamigahara, Gifu 504-0838, Japan

Abstract

Methanol extracts of leaves of Diospyros glaucifolia and D. kaki were showed the scavenging activity of 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical. Chromatographical separation and purification of methanol extracts resulted in isolation of three new flavonol glycosides [2”-(E)-p-coumaroylmyricitrin (3), 3”-(E)-p-coumaroylmyricitrin (4) and mearsetin 3-O-β-glucronopyranoside (11)] along with known phenolic compounds. These structures were determined by means of spectroscopic analysis. The scavenging activities of DPPH radical of the isolated compounds were examined.