期刊
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
卷 50, 期 11, 页码 3143-3146出版社
AMER CHEMICAL SOC
DOI: 10.1021/jf011461m
关键词
Mammea longifolia; Gittiferae; nagkesar; radical scavenging activity; flavonoids; quercetin 3-O-(2 '',4 ''-di-E-p-coumaroyl)-alpha-L-rhamnopyranoside; quercetin 3-O-(3 '',4 ''-di-E-p-coumaroyl)-alpha-L-rhamnopyranoside; shikimic acid derivative
A methanol extract of nagkesar (buds of Mammea longifolia), which showed strong radical scavenging activity, yielded 13 compounds by separations using column chromatography and HPLC. Structure elucidation of these compounds was achieved by H-1 and C-13 NMR, including DQF-COSY, TOCSY, DEPT, HMQC, HSQC, and HMBC. They include two new compounds, quercetin 3-O-(2,4di-E-P-coumaroyl)-alpha.-L-rhamno-pyranoside and quercetin 3-O-(3,4-di-E-p-coumaroyl)-alpha-L-rhamnopyranoside, along with known compounds kaempferol, quercetin, the isopropylidenedioxy derivative of shikimic acid, kaempferol 3-O-(2,4-di-E-p-coumaroyl)-alpha-L-rhamnopyranoside, kaempferol 3-O-(3,4di-E-p-coumaroyl)-alpha-L-rhamnopyranoside, kaempferol 3-O-alpha-L-rhamnopyranoside, quercetin 3-O-alpha-L-rhamnopyranoside, shikimic acid, kaempferol 3-O-beta-D-glucopyranoside, quercetin 3-O-beta-D-glucopyranoside, and beta-sitosterol 3-O-beta-D-glucopyranoside.
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