Comparative Study of Microwave and Ultrasonic Extraction Methods of Pumpkin Seed Oil

The microwave and ultrasonic methods were used to extract pumpkin seed oil respectively,and their extraction conditions were optimized by orthogonal test. The results showed that the optimal conditions of the microwave extraction are as follows: petroleum ether as extraction solvent,mass ratio of raw material to extraction solvent 1:7,microwave irradiation time 7 min and power 640 W. For the ultrasonic extraction,they are as follows: petroleum ether as extraction solvent,mass ratio of raw material to extraction solvent 1:7 and soaking time 24 h. The oil extraction rates are 39.98 % and 38.77 % for the microwave and ultrasonic extraction methods under the optimal extraction condtions,respectively.