摘要
Two new triterpenoid saponins, monepaloside K (1) and monepaloside L (2), together with a known saponin, mazusaponin I (3), were isolated from the water-soluble part of the whole plant of Marina nepalensis var. alba Hand.-Mazz. The structures of monepalosides K and L were determined to be 3-O-α-L-arabinopyranosyl-(1-3)-α-D-xylopyranosyl siaresinolic acid (1) and 3-O-β-D-glucopyranosyl-( 1-3)-β-L-arabinopyranosy1 siaresinolic acid 28-O-β-D-glucopyranosyl-(1-6)-β-D-glucopyranoside (2) respectively, on the basis of chemical and spectroscopic evidence.
从著名藏药白花刺参(Morina nepalensis var.alba Hand Mazz.)的水溶性部分分离到2个新三萜皂甙——刺参甙K(1)和刺参甙L(2),以及一个已知三萜皂甙mazusaponin(3)。应用波谱和化学方法,刺参甙K和刺参甙L的结构分别鉴定为3-O-α-arabinopyranosyl-(1-3)-β-D-xylopyranosyl siaresinolic acid(1)和3-O-β-D-glucopyranosyl-(1-3)-α-L-arabinopyranosyl siaresinolic acid 28-O-β-D-glucopyranosyl-(1-6)-β-D-glucopyranoside(2)。
