Abstract: Clearly demonstrated the principal factors affecting the extraction of soy germ oil with supercritical CO2 fluid. These were extracting pressure, extracting temperature, extracting period, and CO2 flowing rate. The results showed that satisfactory extracting conditions: extracting pressure of 30 MPa, extracting temperature of 45 ℃ for 120 minutes at CO2 flowing rate of 25 kg/h. Under these conditions, the yield of soy germ oil reached 91.38%. At the same time we analyzed the Compositions on extracting of soy germ oil with supercritical carbon dioxide. Supercritical carbon dioxide method got the unsaturated fatty acid content as 84.2%, among them, linolenic acid and linoleic acid account for 74%, its iodine value is 152 gI/100g.

Key words: soy germ oil, supercritical carbon dioxide, extraction