Antioxidant activity of flavonoids from bamboo leaves

The antioxidant activity of total flavonoids from bamboo leaves was determined by various assays,including DPPH radical-scavenging,self-oxidation of 1,2,3-phentriolassay method(325 nm) and Fenton reactions.The results showed that flavonoids from bamboo leaves have very strong scavenging capabilities for superoxide anion and DPPH free radical,their EC50 values are 11.7 μg/mL and 18.3 μg/mL respectively,and are approximately 1.2 times and 3.4 times as much as that of vitamin C respectively.The scavenging capability of bamboo leaves flavonoids for hydroxyl radical is stronger than that of vitamin C,weaker than tea polyphenol,and its EC50 is 0.58 mg/mL.