Two new cycloartane saponins were isolated from the aerial parts of Astragalus sieberi. The structures were elucidated by 1D- and 2D- gradient-enhanced NMR analyses and enzymatic hydrolysis as 20(S),24(R)-epoxy-9 beta, 19-cyclolanostan-3 beta,6 alpha,16 beta,25-tetrol-3-O-beta-D-glucopyranoside and 20(S),24(R)-epoxy-9 beta,19-cyclolanostan-3 beta,6 alpha,16 beta,25-tetrol-3-O-beta-D-glucopyranosyl-(1-->2)-beta-D-glucopyranoside. (C) 1998 Elsevier Science Ltd. All rights reserved.
Cycloartane triterpene glycosides from Astragalus sieberi / L. Verotta, M. Tato, N. El-Sebakhy, S. Toaima. - In: PHYTOCHEMISTRY. - ISSN 0031-9422. - 48:8(1998), pp. 1403-1409.
Cycloartane triterpene glycosides from Astragalus sieberi
L. VerottaPrimo
;
1998
Abstract
Two new cycloartane saponins were isolated from the aerial parts of Astragalus sieberi. The structures were elucidated by 1D- and 2D- gradient-enhanced NMR analyses and enzymatic hydrolysis as 20(S),24(R)-epoxy-9 beta, 19-cyclolanostan-3 beta,6 alpha,16 beta,25-tetrol-3-O-beta-D-glucopyranoside and 20(S),24(R)-epoxy-9 beta,19-cyclolanostan-3 beta,6 alpha,16 beta,25-tetrol-3-O-beta-D-glucopyranosyl-(1-->2)-beta-D-glucopyranoside. (C) 1998 Elsevier Science Ltd. All rights reserved.
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