Quality differences of corn germ oil obtained by three extraction methods

Corn germ oil was extracted by supercritical CO2 extraction,Soxhlet extraction and aqueous enzymatic extraction.The physicochemical properties,fatty acid composition,phospholipid content and unsaponifiable of corn germ oil were measured and compared.The results showed that supercritical CO2 extraction method was preferable when the oil yield,operation safety and environmental protection were taken into account.From the aspect of low health hazard,the acid value of corn germ oil extracted by aqueous enzymatic extraction was too large,and the peroxide value extracted by Soxhlet extraction was high,so that both of the methods were not desirable.Considering fatty acid composition,there was no significant difference among the three methods.From the perspective of nutritional value,the quality of corn germ oil obtained from aqueous enzymatic extraction was better.Three extraction methods had advantages and disadvantages,and supercritical CO2 extraction method was dominant.