Two new steroidal saponins from Tribulus terrestris L.

Abstract

Two new steroidal saponins were isolated from the fruits of Tribulus terrestris L. Their structures were elucidated by spectroscopic and chemical analysis as (23S,24R,25R)-5α-spirostane-3β,23,24-triol-3-O-{α-l-rhamnopyranosyl-(1 → 2)-[β-d-glucopyranosyl-(1 → 4)]-β-d-galactopyranoside} (1) and (23S,24R,25S)-5α-spirostane-3β,23,24-triol-3-O-{α-l-rhamnopyranosyl-(1 → 2)-[β-d-glucopyranosyl-(1 → 4)]-β-d-galactopyranoside} (2).

Keywords:

• Tribulus terrestris L.
• steroidal glycosides
• spirostanol saponins

Acknowledgement

The authors are grateful to the members of the Analytical Center in Shenyang Pharmaceutical University for the measurements of all spectra.