Optimization of ultrasonic extraction of polyphennols from peanut shell by response surface methodology

Response surface methodology(RSM) was selected to optimize for the ultrasonic-assisted extraction process of polyphennols from peanut shell.Based on the experiment of a single factor,the mathematical regression model was established about the dependent variable's(extraction yield of polyphennols) and independent variables(ethanol concentration,ratio of liquid to solid,ultrasonic power,and extraction temperature) through Box-Benhnken design and RSM.The results showed optimum extraction parameters were could be:ethanol concentration of 68%(v/v),the ratio of liquid to solid of 43:1(mL/g),ultrasonic power of 120 W,extraction temperature of 78 ℃.Under these conditions,the practical yield of polyphennols was 1.67%,which was consistent with the predicted yield of polyphennols of 1.69%.