Steroidal oligoglycosides from Solanum nigrum.
Two new steroidal saponins, named nigrumnins I and II, together with two known saponins were obtained from the whole plant of Solanum nigrum L. On the basis of spectroscopic analysis (1H-NMR, 13C-NMR, 1H-1H COSY, TOCSY, HMQC, HMBC and FAB-MS), nigrumnin I was established as (25R)-5alpha-spirostan-3beta-ol 3-O-betaD-xylopyranosyl-(1-->3)-[alpha-L-arabinopyranosyl-(1 -->2)]-beta-D- glucopyranosyl-(1-->4)-[alpha-L-rhamnopyranosyl(1-->2)]-beta-D- galactopyranoside (1), and nigrumnin II was elucidated as (25R)-3beta,17alpha-dihydroxy-5alpha-spirostan-1 2-one 3-O-beta-D-xylopyranosyl-(1-->3)-[alpha-L-arabinopyranosyl-(1--> 2)]-beta-D-glucopyranosyl-(1-->4)-[alpha-L-rhamnopyra- nosyl-(1-->2)l-beta-D-galactopyranoside (2).
Faculty of Pharmaceutical Sciences, Kumamoto University, Japan.
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Ikeda
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Tsumagari
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Nohara
D002240:Carbohydrate Sequence; D006027:Glycosides / Q000737:chemistry / Q000302:isolation & purification; D008969:Molecular Sequence Data; D010840:Phytosterols / Q000737:chemistry / Q000302:isolation & purification; D012503:Saponins / Q000737:chemistry / Q000302:isolation & purification*; D019657:Solanaceae / Q000737:chemistry*; D013150:Spirostans
D006027:Glycosides; D010840:Phytosterols; D012503:Saponins; D013150:Spirostans; C417442:nigrumnin I; C417443:nigrumnin II