Quality analysis and comparisons of different kinds of Camellia oleifera seed oil

In order to understand the effects of different processing and different storage time on quality of Camellia oleifera seed oil, and to provide a theoretical and technological basis for rational selection and controlling processing in production and available selection and using C. oleifera seed oil in consuming. Three different kinds of C. oleifera seed oil were taken as raw materials, including pressed crude oil, extracted crude oil and refined oil. The main physicochemical indexes, composition and contents of fatty acids as well as changes in different years were analyzed and compared. The results showed that there were very significant differences between acid value, iodine value, saponification value and peroxide value in the three kinds of oils, and the differences in refractive indexes were significant. Composition and relative contents of the fatty acids in the three kinds of oils were almost the same, and oleic acid occupied the most of the percentage(over 74%). Followed by palmitic acid(13%-14%), and then was the linoleic acid(about 7%-9%). All unsaturated fatty acid contents in the three kinds of oils were more than 84%, and it in the refined oil was the highest, followed by the pressed crude oil, and that in the extracted crude oil content was the lowest. Monounsaturated fatty acid content in the pressed crude oil was the highest, up to 76.967%, followed by the refined oil(76.646%), and that in the extracted crude oil was the lowest(75.066%). Polyunsaturated fatty acid content in the extracted crude oil was the highest, up to 9.300%, followed by the refined oil(8.000%), and that in the pressed crude oil was the lowest(7.433%). The pressed crude oil of C. oleifera seed produced in different years, had some changes in the relative content of fatty acid, and thus oil quality and stability in storage were affected.