ULTRASONIC-ASSISTED EXTRACTION OF FLAVONOIDS FROM APPLE POMACE

The process of extraction of flavonoids from apple pomace with ultrasonic wave was studied.The effect of ethanol concentration,ultrasonic power,temperature,treating time,marinating time and ratio of solid to liquid on extracting rate of total flavonoids were investigated by using single factor analysis method.Basing on the experiment of single factor,the optimum extraction conditions of flavonoids from apple pomace using ultrasonic method was studied according to the orthogonal experiment design.The optimal process of extraction of flavonoids from apple pomace with ultrasonic wave were as follows:80 % ethanol,extracting duration 30 min,ultrasonic power 480 W,ratio of solid to liquid 1:40(g/mL),marinated time 24 h,temperature70 ℃,twice ultrasonic extraction p rocess.The extracting rate of total falconoid was 7.42 mg/g.