Microwave-assisted extraction of oleanolic acid from pomegranate peel.

Extraction process of oleanolic acid from wild pomegranate peel was studied by microwave. The results showed that the optimum conditions based on single factor and orthogonal test were as follows: extracting wild pomegranate peel with 25 times volume of 90% ethanol at microwave 300W for 60s at 60℃. Under these conditions, the yield of oleanolic acid was 1.5928 mg/g.