[Flavonoids in leaves of Alstonia scholaris].
Copyright policy )[Flavonoids in leaves of Alstonia scholaris].
To investigate the flavonoids in leaves of Alstonia scholaris, an ethno-remedy of Dai People in Yunnan.The chemical constituents were isolated and purified by column chromatography. Their structures were elucidated on the basis of spectroscopic evidences and physicochemical properties.Eight flavonoids were isolated and identified as kaempferol (1), quercetin (2), isorhamnetin (3), kaempferol-3-0-beta-D-galactopyranoside (4), quercetin-3-0-beta-D-galactopyranoside (5), isorhamnetin-3-0-beta-D-galactopyranoside (6), kaempferol-3-0-beta-D-xylopyranosyl-( 2-1)-0-beta-D-galactopyranoside (7) ,quercetin-3-0-beta-D-xylopyranosyl-( 2-1)-0-beta-D-galactopyranoside (8).Flavonoids 1-7 were isolated from A. scholaris for the first time.
Flavonoids, Plant Leaves, Alstonia
Flavonoids, Plant Leaves, Alstonia
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