The structure of a new acylated flavonol glycoside from the leaf extract of Euphorbia maculata was characterized as quercetin 3-O-(2",3"-di-O-galloyl)-β-D-glucopyranoside. Four new hydrolyzable tannins together with twelve known tannins were also isolated and their structures were established by spectral and chemical means as 1,2,6-tri-O-galloyl-α-D-glucose, 1-O-galloyl-2,4;3,6-di-O-chebuloyl-β-D-glucose (eumaculin E), and dimers (eumaculins B and D) having a tergalloyl and a macaranoyl group as the linking unit of monomers, respectively.
tannin, Euphorbia maculata, Euphorbiaceane, eumaculine B, eumaculine E
Publication DOI: 10.1139/v97-088Journal NLM ID: 0372705Publisher: National Research Council of Canada Canada
Correspondence: yoshida@pheasant.pharm.okayama-u.ac.jp
Institutions: Faculty of Pharmaceutical Sciences, Health Sciences University of Hokkaido, Ishikari-Tobetsu, Hokkaido 061-02, Japan
Methods: 13C NMR, 1H NMR, FAB-MS, TLC, enzymatic hydrolysis, ESI-MS, acid hydrolysis, chemical methods, UV, extraction
Found