New triterpenoid saponins from the flowers of Pueraria thomsonii

Abstract

Two new oleanane-type triterpenoid saponins, kakkasaponin II (1) and kakkasaponin III (2), were isolated from the methanol extract of the flowers of Pueraria thomsonii (Leguminosae), together with seven known oleanane-type triterpenoid saponins, phaseoside IV (3), sophoradiol monoglucuronide (4), kakkasaponin I (5), kaikasaponin III (6), soyasaponin I (7), soyasaponin III (8), and soyasaponin IV (9). The structures of 1 and 2 were elucidated by spectroscopic methods including IR, ESI-TOF-MS, and 1D and 2D NMR experiments.

Keywords::

• Pueraria thomsonii
• Leguminosae
• triterpenoid saponins

Acknowledgments

This study was financially supported by the Research Fund for the Doctoral Program of Higher Education, China (No. 200801630007), and the 2008 Scientific Technology Plan Project from Science and Technology Department of Liaoning Province, China (No. 20082260233).