Studies on Rhubarb (Rhei Rhizoma). II. Anthraquinone Glycosides
- 1 January 1973
- journal article
- Published by Pharmaceutical Society of Japan in CHEMICAL & PHARMACEUTICAL BULLETIN
- Vol. 21 (6) , 1254-1260
- https://doi.org/10.1248/cpb.21.1254
Abstract
Along with chrysophanol glucoside (I), mp 245-246°, C21H20O9·1/2H2O, and 8-O-β-D-glucopyranosides of physcion, emodin, aloe-emodin and rhein, three new anthraquinone glucosides, II : mp 187-189°, C21H20O10·2H2O, III : mp 239-241°, C21H20O10·1/2H2O and IV : mp 210-215°were isolated from the rhubarb, and II and III were respectively identified with 1, 8-dihydroxy-3 [-O-β-D-glucopyranosylmethyl]-aloe-emodin and 1-O-β-D-glucopyranosyl-emodin by spectral analyses of them, their permethylates and aglycones of permethylates. Although physical constants of I were quite the same with those of chrysophanein (1-O-β-D-glucopyranosyl-chrysophanol), I was found to be a mixture of 1-and 8-O-β-D-glucopyranosyl-chrysophanols by nuclear magnetic resonance spectral analysis of the aglycone of its permethylate.Keywords
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