Ultrasonic-Assisted Extraction of Polyphenols from Apple Pomace

Ultrasonic-assisted extraction technique for polyphenols from apple pomace were studied in this study,and the factors which affecting extraction yield,the concentration of ethanol,the ratio of apple pomace to extractant,extracting time and temperature were investigated using the secondary regression orthogonal rotary combination design.The results indicated that extraction ratio of polyphenols was affected by temperature,the ratio of apple pomace to extractant,time and the concentration of ethanol in order.The optimum conditions were as follows: the concentration of ethanol 50%,the ratio of apple pomace to extractant 1∶20,extraction temperature 60 ℃,extraction time 24 min;the extraction yield on this condition was 3.80 mg/g.