Optimization of ultrasonic assisted extraction conditions of flavonoids from Tamarindus indica shell by response surface method

The shell of Tamarindus indica as material,ethanol as extracting agent,the flavonoids in Tamarindus indics was extracted by ultrasonic assisted extraction. The extraction ratio of total flavonoids as index,material liquid ratio,ethanol concentration,ultrasonic time and ultrasonic power as factors,single factor test and response surface optimization test were taken. The results showed that the optimum extraction conditions of flavonoids from Tamarindus indica shell were concentration of ethanol 60%,liquid-solid ration of 1 ∶47(g/m L),ultrasonic time 26 min,and ultrasonic power 1080 W. Under the above optimized conditions,the yield of flavonoids from Tamarindus indica shell was 81.59%.