Abstract: In order to screen the appropriate method for the extraction of high-quality grape seed oil, Soxhlet extraction, reflux extraction, ultrasonic extraction and microwave extraction were compared for their effectiveness in extracting oil from grape seeds remaining after wine fermentation. Microwave extraction was found to provide the highest oil yield, and the optimization of conditions for the extraction of grape seed oil by the method was performed using orthogonal array design. The optimal microwave extraction conditions were found to be: material/liquid ratio, 1:15; extraction time, 10 min; temperature, 70 ℃; and microwave power, 700 W, and the optimal refining conditions for crude oil were NaOH concentration 4.13 mol/L, excess alkali quantity 0.5%, and initial temperature 50 ℃. The physicochemical properties of the resulting refined oil were in line with the requirements of the national standard GB/T 1684－2006.

Key words: grape seed oil, extraction process, physical and chemical indicators, refining process