Antioxidant activity and two new flavonoids from Washingtonia filifera

Two new flavonoids, 8-hydroxyisoscoparin (1) and luteolin 7-O-glucoside 4″-sulfate (2), along with eight known flavonoids, including luteolin 7-O-glucoside 2″-sulfate, were isolated and identified from Washingtonia filifera. All compounds were characterized by 1H-NMR, 13C-NMR, CI-MS, FABMS and UV. The antioxidant activities of various W. filifera extracts were determined.