[Flavonoids in leaves of Alstonia scholaris].
OBJECTIVE
To investigate the flavonoids in leaves of Alstonia scholaris, an ethno-remedy of Dai People in Yunnan.


METHODS
The chemical constituents were isolated and purified by column chromatography. Their structures were elucidated on the basis of spectroscopic evidences and physicochemical properties.


RESULTS
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).


CONCLUSIONS
Flavonoids 1-7 were isolated from A. scholaris for the first time.
Hui
Tingting
T
School of Pharmacy, Yunnan College of Traditonal Chinese Medicine, Kunming 650200, China.
Sun
Yun
Y
Zhu
Liping
L
Guo
Wen
W
Rao
Gaoxiong
G
D031051:Alstonia / Q000737:chemistry*; D005419:Flavonoids / Q000032:analysis* / Q000302:isolation & purification; D018515:Plant Leaves / Q000737:chemistry*
D005419:Flavonoids