Extraction of flavonoids from sweet osmanthus leaves aided by ultrasound

Flavonoids,also commonly referred to as bioflavonoids,have wide biological activities such as anti-aging,anti-cancer,ati-HIV,antioxidant as well as anti-inflammation.The influence of ethanol concentration、the ratio of solid and liquid,the ultrasonic time and the power on extraction efficiency were sdudied.L9(34)orthogonal experiment result of extraction of flavonoids form corn with ultrasonic aids showed that the optimum extraction conditions was:ethanol concentration 70%,the ratio of solid and liquid 1∶25,the ultrasonic time and the power 50min and 350W.The best extraction efficiency was 7.85%,which was higher than traditional extraction efficiency of 5.02%。