[Flavonoids from Beijing propolis].
OBJECTIVE
To separate and identify the active flavonoids from Beijing Propolis.


METHODS
The flavonoids were isolated by column chromatography with silica gel and polyamide, purified with Sephadex LH-20, and elucidated on the basis of NMR, MS, UV, IR and CD spectra.


RESULTS
Six kinds of flavonoids were obtained and elucidated as I: pinostrobin, 5-hydroxy-7-methoxy-flavanone; II: pinocembrin, 5, 7-dihydroxy-flavanone; III: tectochrysin, 5-hydroxy-7-methoxy-flavone; IV: chrysin, 5, 7-dihydroxy-flavone; V: izalpinin, 5-hydroxy-7-methoxy-flavonol and VI: galangin, 5, 7-dihydroxy-flavonol.


CONCLUSIONS
Compounds I, II, III and V were found for the first time from Beijing Propolis.
Zhou
L
L
Institute of Medicinal Plant, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100094.
Guo
J
J
Yu
J
J
D044950:Flavanones; D005419:Flavonoids / Q000737:chemistry / Q000302:isolation & purification*; D008419:Materia Medica / Q000737:chemistry*; D011429:Propolis / Q000737:chemistry*
D044950:Flavanones; D005419:Flavonoids; D008419:Materia Medica; C016063:pinocembrin; D011429:Propolis; C402729:tectochrysin; C411294:pinostrobin