Bioactive dammarane triterpenoid saponins from the leaves of Cyclocarya paliurus

Thirteen undescribed dammarane triterpenoid saponins (cypaliurusides A–M), including eleven seco-dammarane type triterpenoids , were isolated from Cyclocarya paliurus . Each of these compounds has the unique feature of having a monosaccharide attached to C-11, rather than C-12, compared to the same type of saponins found in this plant. The structures of them were determined by comprehensive analysis of 1D, 2D NMR and HRESIMS data. Cypaliuruside J showed significant α -glucosidase inhibitory effect with IC 50 value of 2.22 ± 0.13 μM. In addition, Cypaliurusides F and K exhibited modest cytotoxic activities against selected human cancer cell lines in vitro, with IC 50 values ranging from 4.61 ± 0.13 to 15.23 ± 3.88 μM.