Saponins from leaves of Kalopanax pictum var. maximowiczii, a Korean medicinal plant

From leaves of Kalopanax pictum var. maximowiczii, a Korean medicinal plant, six known saponins of hederagenin were isolated. One of the monodesmosides was identified as sapindoside A, previously isolated from Sapindus spp. Another monodesmoside and four bisdesmosides were proved to be identical with saponins-K3, -K10 and -K12 and Kizuta saponins-K8 and -K11, respectively, all of which have been isolated from Hedera rhombea. It was observed that the water solubilities of these monodesmosides were increased in the presence of the co-occurring bisdesmosides. The relationship between structure and solubilizing effect is reported.