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| Dynamic change of secondary oxidation products in flaxseed oil at high temperature |
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| KeyWord:flaxseed oil oxidation peroxide value acid value carbonyl value aliphatic aldehyde compound |
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| Abstract: |
| The dynamic changes of peroxidation value, acid value, carbonyl value and secondary oxidation products aliphatic aldehyde compounds in flaxseed oil heating at 100-200?℃ for 1-5 h were investigated. The results showed that the peroxide value of flaxseed oil increased with the extension of heating time at 100?℃, and it increased first then decreased at 120-200?℃, while the acid value and carbonyl value of flaxseed oil increased with heating time extension and heating temperature rising. Linolenic acid produced the most characteristic secondary oxidation products during the oxidation of flaxseed oil at high temperature, followed by linoleic acid and oleic acid. Among the secondary oxidation products of linolenic acid, propionaldehyde was easily formed and had the highest content,in contrast, trans-2-pentenal and trans-2-hexenal produced later and slower. Hexanal first produced in the secondary oxidation products of linoleic acid, and the trans-2-nonenal and trans- and trans-2,4-decadienal produced later and slower.The secondary oxidation product of oleic acid nonanal was not detected when reacting at 120?℃ for 1 h, later nonanal content increased with heating temperature rising,and first increased then decreased with heating time prolonging. |
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