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| Effect of refining on antioxidant activities of soybean oil and rapeseed oil |
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| KeyWord:soybean oil rapeseed oil refining antioxidant activity |
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| Abstract: |
| The effects of refining process on the acid value，peroxide value，contents of tocopherol and sterol of soybean oil and rapeseed oil were studied. The changes of oxidative stability indexes and antioxidant activities of soybean oil and rapeseed oil during refining were also researched. The results showed that the acid values，peroxide values，contents of tocopherol and sterol of soybean oil and rapeseed oil decreased with the refining going ahead；acid value and peroxide value significantly reduced in deacidification stage and bleaching stage respectively；the maximum reduction of tocopherol was observed in deodorization stage，especially γ-tocopherol and δ-tocopherol；the content of sterol reduced markedly in deacidification stage；the oxidative stability index reduced because of the losses of tocopherol and sterol while it improved because of the removal of free fatty acids after deodorization；the scavenging capacity of oil on free radical was not influenced significantly by the loss of trace substances during refining，while the total reducing ability of oil decreased remarkably after deacidification，which was closely related to the losses of tocopherol and sterol. |
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