Abstract
A new flavonoid compound isokaempferide 7- O-β- d-(6″-methylglucuronide) ( 1) was isolated from flowers of Cirsium rivulare (Jacq.) All. Its structure was elucidated on the basis of spectroscopic studies (UV, 1H and 13C NMR, FABMS). Moreover, five known flavonoid compounds: apigenin 7-(6″-methylglucuronide) ( 2), hispidulin 7-glucoside ( 3), isokaempferide 7-glucuronide ( 4), kaempferol 3-galactoside ( 5), pectolinarin ( 6) were isolated from this source for the first time. The antimicrobial activity of aqueous, methanolic and 70% ethanolic extracts of Cirsium rivulare flowers and leaves was also evaluated.
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