Study on ultrasonic wave-assisted Semi-bionic extraction and antioxidant activity of flavonoid glycoside from Herba Lobelia Chinensis

Studied the optimal technical paramters for extraction flavonoids glycosides from Herba Lobelia Chinensis by ultrasonic-assisted semi- bioni extraction and its antioxidant activity.The experimental results showed that the optimal conditions were as follow:70% ( v /v) of ethanol- water ( as the extracting solvent) , 1 ∶ 40g /mL of solid to liquid ratio, 70W of ultrasonic power and 25min of ultrasonic time.The content of flavonoids glycosides was found to be 4.6975mg /g by the orthogonal design under the optimal conditions. The results of antioxidation showed that flavonoid glycosides from Herba Lobelia Chinensis had a certain scavenging effect on hydroxyl free radical and superoxide anion free radical.The reduction capability increased with increasing flavonoid glycosides concentration in experimental.Therefore, flavonoid glycosides were a powerful natural antioxidant.