Isolation and structure determination of steroidal saponin from Dioscorea zingiberensis
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Abstract
To study the chemical constituents of Dioscorea zingiberensis Wright, the EtOH extract of fresh rhizomes of D. zingiberensis was concentrated and partitioned further to produce petroleum ether-, ethylacetate-, n-butanol- and water-soluble fractions. The water-soluble fraction was subjected to column chromatography on macro resin AB-8, and the final products were obtained by repeated reversed-phase ODS and MCI gel CHP 20P column chromatography. Structures of compounds were elucidated by 1H NMR, 13C NMR, 135DEPT, HMQC, HMBC and TOCSY spectroscopic analyses. A new steroidal saponin was isolated, which was identified as (25R)-26-O-(β-D-glucopyranosyl)-furost-5-en-3b, 16, 20, 26-tetraol-22-seco-3-O-b-D-glucopyranosyl-(1→ 3)-b-D- glucopyranosyl-(1→ 4)-a-L-rhamnopyranosyl-(1→2)-b-D-glucopyranoside. The compound is a novel skeletally steroidal saponin, named as zingiberenin F (1). It was reported for the first time from D. zingiberensis Wright.
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