Formation of polymerization compounds during thermal oxidation of cottonseed oil, partially hydrogenated cottonseed oil and their blends
Formation of polymerization compounds during thermal oxidation of cottonseed oil, partially hydrogenated cottonseed oil and their blends
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DOI：
10.3989/gya.2006.v57.i3.50
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发表时间：
2006-09
期刊：
影响因子：
1.4
通讯作者：
C. Steel;M. Dobarganes;D. Barrera-Arellano
中科院分区：
文献类型：
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作者：
C. Steel;M. Dobarganes;D. Barrera-Arellano
棉籽油、部分氢化棉籽油及其混合物(碘值在60-110之间，经氧化铝处理去生育酚或未去生育酚)的样品在180℃下热氧化10小时。在0、2、5、8和10小时采集样品，用于二聚体和聚合物(降解化合物)和生育酚的测定。验证了氢化度对二聚体和聚合物形成的影响，以及原来存在的生育酚在保护脂肪和油脂防止热降解方面的作用。对生育酚的降解曲线表明，棉籽油和棉籽油中的生育酚(α和γ-生育酚)的降解速率很快，在热氧化条件下10小时后残留水平接近于零。然而，含有天然生育酚的样品表现出较慢的热降解速度。在抗热降解方面，不饱和度明显比生育酚含量更重要。
Samples of cottonseed oil, partially hydrogenated cottonseed oil and their blends, with iodine values between 60 and 110, tocopherol-stripped or not by aluminium oxide treatment, were submitted to thermal oxidation, at 180 °C, for 10 hours. Samples were collected at 0, 2, 5, 8 and 10 hours, for the determination of dimers and polymers (degradation compounds) and of tocopherols. The influence of the degree of hydrogenation on the formation of dimers and polymers and the role of originally present tocopherols in the protection of fats and oils against thermal degradation was verified. The degradation curves for tocopherols showed a fast destruction rate for the tocopherols present in cottonseed fats and oil ( α and γ -tocopherols), with residual levels close to zero after 10 hours under thermal oxidation conditions. Nevertheless, samples with their natural tocopherols presented a slower rate of thermal degradation. The unsaturation degree was apparently more important in the protection against thermal degradation than the content of tocopherols