Extraction of Flavonoids from Bamboo Leaves and Their Antioxidant Activity

Total flavonoids were extracted from bamboo leaves by 95% ethanol as solvent and ultrasonic.The oxidation activity of flavonoids in bamboo leaf was determined by the methods of pyrogallol autoxidation and Fenton reaction.The results showed that the extraction yield of flavonoids from bamboo leaf was 5.30%,and the content of flavonoids in the crude extract was 13.90%.The clearance rate of O2-· by 0.2 mL 1 mg/mL bamboo leaf flavonoids was 17.39%;while the clearance rate of ·OH by 0.7 mL 1 mg/mL bamboo beaf flavonoids was 58.20%,it showed that flavonoids in bamboo leaf had good antioxidant activity.