20(R)-ginsenoside-Rh2,ginsenoside-Rg3 and 20(S)-ginsenoside Rg3 were prepared by the hydrolysis of leaf saponins of Panax notoginseng(Burk.)F.H.Chen with solution of 50% acetic acid and then column chromatograph...20(R)-ginsenoside-Rh2,ginsenoside-Rg3 and 20(S)-ginsenoside Rg3 were prepared by the hydrolysis of leaf saponins of Panax notoginseng(Burk.)F.H.Chen with solution of 50% acetic acid and then column chromatography on silica gel.Their structures were characterized by spectroscopic analysis,chemical degradation and comparison with authentic samples.展开更多
Gypenosides, a series of dammarane-type saponins from Gynostemma pentaphyllum Makino, were hydrolyzed under 5% H_2SO_4 catalysis to afford the title compound as a new secondary sapogenin in addition to panaxadiol and...Gypenosides, a series of dammarane-type saponins from Gynostemma pentaphyllum Makino, were hydrolyzed under 5% H_2SO_4 catalysis to afford the title compound as a new secondary sapogenin in addition to panaxadiol and 2a-hydroxypanaxadiol. The crystals of the title compound were obtained from methanol solution and a colourless crystal with dimensions of 0.2 × 0.2 × 0.2 mm was used. C_(30)H_(50)展开更多
文摘20(R)-ginsenoside-Rh2,ginsenoside-Rg3 and 20(S)-ginsenoside Rg3 were prepared by the hydrolysis of leaf saponins of Panax notoginseng(Burk.)F.H.Chen with solution of 50% acetic acid and then column chromatography on silica gel.Their structures were characterized by spectroscopic analysis,chemical degradation and comparison with authentic samples.
文摘Gypenosides, a series of dammarane-type saponins from Gynostemma pentaphyllum Makino, were hydrolyzed under 5% H_2SO_4 catalysis to afford the title compound as a new secondary sapogenin in addition to panaxadiol and 2a-hydroxypanaxadiol. The crystals of the title compound were obtained from methanol solution and a colourless crystal with dimensions of 0.2 × 0.2 × 0.2 mm was used. C_(30)H_(50)