Flavonoids from the Leaves of Ailanthus altissima Swingle and Their Antioxidant Activity

Phytochemical studies on the leaves of Ailanthus altissima have not been reported previously. Thus, the authors isolated and identified secondary metabolities from A. altissima. Dried and powdered leaves were extracted with 80% queous methanol, and the concentrated extract was successively partitioned with ethyl acetate, n-butanol, and water. Four flavonoids were isolated from the ethyl acetate fraction through repeated silica gel and octadecyl silica gel column chromatography.