[Flavonoids from rhizome of Alpinia tonkinensis].
OBJECTIVE
To find out the bioactive principles of Alpinia tonkinensis, by investigating its chemical constituents.


METHODS
It was extracted with MeOH, distributed by different solvents, and isolated via column chromatography on silica gel.


RESULTS
Six compounds were elucidated through spectral analysis, which were as follows: 4',7-dimethylkaempferol(I), 5-hydroxy-3',4',7-trimethoxyflavanone(II), kumatakenin(III), 4',5,7-trimethoxyflavonol(IV), ombuine(V), and kaempferol(VI).


CONCLUSIONS
Six flavonoids were isolated from this plant for the first time, and so were four compounds from genus Alpinia.
Zhang
Jian
J
Department of Natural Medicinal Chemistry, China Pharmaceutical University, Jiangsu, Nanjing 210038.
Guo
Qing-hai
QH
Kong
Ling-yi
LY
D032429:Alpinia / Q000737:chemistry*; D005419:Flavonoids / Q000737:chemistry / Q000302:isolation & purification*; D044949:Kaempferols / Q000737:chemistry / Q000302:isolation & purification; D010946:Plants, Medicinal / Q000737:chemistry*; D027343:Rhizome / Q000737:chemistry
C487686:4',7-dimethylkaempferol; D005419:Flavonoids; D044949:Kaempferols; C487687:ombuine