[Studies on the chemical constituents from Conyza canadensis].

OBJECTIVE

To study the chemical constituents of Conyza canadensis.

METHODS

Chromatographic methods including HP20 macroporous resin, silica gel, Sephadex LH-20 and eighteen alkyl silane bonding silica gel (ODS) were used for the isolation and purification of Conyza canadensis. The structures of the obtained compounds were identified by physical chemistry and spectroscopic data.

RESULTS

Six compounds were isolated from ethanol-extraction of water area of C. canadensis and identified as Eugenyl beta-Psd (1), scutellarin (2), luteolin-7-O-beta-D-glucuronide (3), quercetin (4), quercetin-3-O-beta-D-glucopyranoside (5) and luteolin (6).

CONCLUSIONS

Compounds 1,3,5 and 6 are isolated from C. canadensis for the first time.