Analysis of Physicochemical Properties and Antioxidant Capacity of Evening Primrose Oil during Refining

Evening primrose oil is a rare oil, which is rich in linoleic acid, palmitic acid, oleic acid and linolenic acid and many other unsaturated fatty acids that are beneficial to human body. It has extremely high nutritional value and health care function, so it can play a role in the inhibition and prevention of some diseases. This topic proposed by means of evening primrose oil in the refining process, the sample of different refining link to the physical and chemical properties, volatile components and antioxidant capacity test and analysis, aims to explore the evening primrose oil, in the process of production of nutrient losses, and causes of its nutrient loss, to improve the quality of evening primrose oil, grease to provide scientific theory basis. The main research contents are as follows: (1)The national standard method was adopted to determine the main physicochemical indexes of evening primrose oil in different refining processes, and the changes were analyzed. The changes of fatty acid content and composition of evening primrose oil during refining were determined and analyzed. (2)DPPH, ABTS, FRAP and ORAC in vitro antioxidant evaluation methods were used to determine the changes of antioxidant capacity of evening primrose oil during the refining process, and Pearson bivariate correlation analysis was used to obtain the correlation between the contents of tocopherol, total phenol, phytosterol and squalene in evening primrose oil and antioxidant capacity.