| The extraction process of Paeonia suffruticosa Andr. (Fengdan) seed oil by conventional hexane extraction method was optimized, and was compared with the ultrasound- assisted hexane extraction method. The fatty acid composition of Paeonia suffruticosa Andr. (Fengdan) seed oil was determined by GC-MS. The results showed that the optimal extraction conditions of Paeonia suffruticosa Andr. (Fengdan) seed oil by conventional hexane extraction method were obtained as follows: solid-liquid ratio 1∶?6, extraction time 8 h and extraction temperature 65?℃. Under these conditions, the yield and extraction rate were 30.67% and 93.5%, respectively. Under the conditions of ultrasound power 350 W, ultrasonic time 20 min, extraction temperature 50?℃ and solid-liquid ratio 1∶?6 by ultrasound- assisted hexane extraction method, the yield and extraction rate were 30.63% and 93.4%, respectively. The main fatty acids in Paeonia suffruticosa Andr. (Fengdan) seed oil were palmitic acid, linoleic acid, linolenic acid and stearic acid, and the contents of unsaturated fatty acid and linolenic acid were 85.47% and 60074%, respectively. Compared with the conventional hexane extraction method, the ultrasound-assisted hexane extraction method had advantages of high extraction efficiency and low extraction temperature, etc. |
