Antioxidant effect of flavonoids in extracts from the Eriobotrya Japonica( Thunb.) Lindl.leaves

The objective of this study was to compare the total flavonoids contents in extracts from the different parts of Eriobotrya Japonica( Thunb.) Lindl leaves and to explore the antioxidant activities of the total flavonoids. The leaves were extracted with the ultrasonic method,and the contents of total flavonoids in different extracts were detected by Colorimetry. The lipid oxidation of fat was evaluated by the peroxide value under Schaal oven test conditions. Meanwhile,the antioxidant activities of total flavonoids were investigated by DPPH and ABTS free radical savenging assays.The results indicated the extracts from leaf tip had the highest flavonoids content( 5.79 ±0.03) mg / g.The antioxidant effect of flavonoids on lard was existed and was enhanced with the increasing amount.Besides,within the scope of the study,the results showed that the flavonoids had remarkable activity for DPPH and ABTS radical scavenging,and the reduction ability increased with the concentration in experimental selecting concentration range.