[The separation and identification of the flavonoids from the leaves of Bryophyllum pinnatum].

This study investigated the separation of the effective compositions containing quercetin derivatives from the leaves of Bryophyllum pinnatun by solvent extraction of methanol, polar adsorption by porous polymetric resins, mixed solvent extraction of methanol with chloroform and polyamide chromatography. The results indicated that the yield of product containing 51.23% quercetin in the form of quercetin derivatives was 0.2% (W/W). Through the NMR, Mass spectrum, Infrared spectrum, we try to identify the chemical structure of the flavonoids LEF. As a result we can conclude that the chemical structure of the flavonoids from the leaves of Bryophy Ilum pinnatum is C26H28O15 (quercetin3-alpha-L-rha-beta-D-xyl), molecular weight is 580.