Saponins of the Leaves of Panax ginseng C. A. MEYER

抄録

From the leaves of Panax ginseng C. A. MEYER, six saponins I, II, III, IV, V, and VI were isolated. Saponins IV, V, and VI were proved to be identical, respectively with ginsenosides-Rg₁, -Re, and-Rd, all of which have already been isolated from Ginseng roots. The high contents of these saponins in the leaves indicate significance of the leaves as the source of the dammarane-type saponins and their sapogenins. New saponins I, II, and III designated as ginsenosides-F₁, -F₂, and-F₃ were established to be formulated as 20-O-β-glucopyranosyl-20 (S)-protopanaxatriol, 3, 20-di-O-β-glucopyranosyl-20 (S)-protopanaxadiol, and 20-O-(α-arabinopyranosyl-(1→6)-β-glucopyranosyl)-20 (S)-protopanaxatriol, respectively, on the basis of the enzymatic hydrolysis, mass spectra of their acetates, nuclear magnetic resonance, and chemical evidences.