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Structural Studies of Zoospore Attractants from Trachelospermum jasminoides var. pubescens : Taxifolin 3‐ O ‐glycosides
Author(s) -
Hosoi Shinzo,
Shimizu Eri,
Ohno Kosei,
Yokosawa Ryozo,
Kuninaga Shiro,
Coskun Maksut,
Sakushima Akiyo
Publication year - 2005
Publication title -
phytochemical analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 72
eISSN - 1099-1565
pISSN - 0958-0344
DOI - 10.1002/pca.876
Subject(s) - taxifolin , chemistry , glycoside , botany , stereochemistry , biochemistry , flavonoid , biology , antioxidant
Abstract (2 S , 3 S )‐Taxifolin 3‐ O ‐arabinoside, a new dihydroflavonol glycoside, together with the known substances, (2 R , 3 R )‐taxifolin 3‐ O ‐arabinoside, astragalin, isoquercitrin, and cosmosiin, were isolated from the leaves of Trachelospermum jasminoides var. pubescens . Structural elucidation was carried out by spectroscopic methods, and the absolute configurations of C‐2 and C‐3 in taxifolin 3‐ O ‐arabinosides were determined on the basis of circular dichroism. Unlike the dihydroflavonol glycosides, (2 R , 3 R )‐taxifolin 3‐ O ‐glucoside and (2 R , 3 R )‐taxifolin 3‐ O ‐arabinoside, the novel (2 S , 3 S )‐taxifolin 3‐ O ‐arabinoside is not effective as a zoospore attractant of the plant pathogenic fungus Aphanomyces cochlioides . Copyright © 2005 John Wiley & Sons, Ltd.