| With sesame, peanut, oil-tea camellia seed and rapeseed as raw materials, oils were extracted by hot pressing process and cold pressing process, and the basic physicochemical indexes, composition and contents of main fatty acids, polyphenol content, tocopherol content and sterol content of the oils were compared and analyzed. The results showed that different preparation processes had no significant effect on the composition and contents of main fatty acids and basic physicochemical indexes of oils extracted from the four materials. The contents of polyphenols in hot pressed rapeseed oil, hot pressed sesame oil, hot pressed peanut oil and hot pressed oil-tea camellia seed oil were 4.76，2.08，2.99，1.17 times of the cold pressed oils respectively. The contents of tocopherol in cold pressed peanut oil, cold pressed oil-tea camellia seed oil, cold pressed sesame oil and cold pressed rapeseed oil were 1.19，117，1.12，1.07 times of the hot pressed oils respectively. The contents of sterol in cold pressed sesame oil, cold pressed peanut oil, cold pressed oil-tea camellia seed oil and cold pressed rapeseed oil were 1.21，129，1.27，1.20 times of the hot pressed oils respectively. |
