アカシヨウマの成分研究

抄録

Quercetin was obtained, and confirmed as its methyl and acetyl derivatives, from the flowers of Astilbe Thunbergii Miquel, collected during its flowering time on Mount Hiei, near Kyoto. A substance of m.p. 170-180°, giving positive Mg-HCl reaction, was also obtained but in a very minute amount. Astilbin and bergenin were obtained from the rhizome. Hydrolysis of astilbin gave rhamnose and distylin (3, 5, 6, 3′, 4′-pentahy-droxyflavanone). Methyl and acetyl derivatives of distylin were also obtained, as well as quercetin by its oxidation with 10% H₂SO₄. Bergenin was also confirmed as its acetyl and methyl derivatives. The fact that quercetin from the flowers and astilbin from rhizome were obtained from Astilbe Thunbergii is very interesting from phytophysiology and from phytotaxonomy together with the fact that whereas distylin has been individually found in Distylium racemosum S. et Z., and bergenin from Corylopsis spicata S. et Z., in Hamamelidaceae family, both have been found together in Astilbe genus of Saxifragaceae family.