期刊
NATURAL PRODUCT RESEARCH
卷 33, 期 2, 页码 280-286出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/14786419.2018.1446135
关键词
Rhamnus alaternus L; rhamnaceae; anthraquinone glycosides; alaternosides A-C; NMR; FAB-MS; DPPH scavenging activity
资金
- Ministry of Higher Education and Scientific Research in Tunisia [99/UR/07-03]
From the butanolic and the ethyl acetate extracts of Rhamnus alaternus L root bark and leaves, three new anthraquinone glycosides, alaternosides A-C (1,4,6,8 tetrahydroxy-3 methyl anthraquinone 1-O-ss-D-glucopyranosyl-4,6-di-O-alpha-L-rhamnopyranoside (1); 1,2,6,8 tetrahydroxy-3 methyl anthraquinone 8-O-ss-D-glucopyranoside (2) and 1, 6 dihydroxy-3 methyl 6 [2 '-Me (heptoxy)] anthraquinone (3)) were isolated and elucidated together with the two known anthraquinone glycosides, Physcion-8-O-rutinoside (4) and emodin-6-O-alpha-L-rhamnoside (5) as well as with the known kaempferol-7-methylether (6), beta-sitosterol (7) and beta-sitosterol-3-O-glycoside (8). Their chemical structures were elucidated using spectroscopic methods (1D-, 2D-NMR and FAB-MS). Free radical scavenging activity of the isolated compounds was evaluated by their ability to scavenge DPPH. free radicals. Compounds (3), (4) and (6) showed the highest activity with IC50 values of 9.46, 27.68 and 2.35 mu g/mL, respectively.
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