摘要
采用差示扫描量热法对菜籽油掺伪棉籽油进行研究。结果表明:菜籽油和棉籽油在结晶与熔融过程的DSC曲线具有明显区别。棉籽油的掺入量大于或等于5%时,菜籽油熔融过程的特征热力学参数有显著差异(p<0.05)。随着棉籽油掺入量增加,菜籽油的特征热力学参数呈现递变趋势,其特征热力学参数与棉籽油掺入量呈现良好线性关系,菜籽油结晶过程的峰值温度T_(peak1)、T_(peak2)和熔融过程的峰值温度T_(peak5)拟合程度较好(R2>0.99),其中T_(peak1)高达0.997。该法便捷、有效,适用于菜籽油掺伪棉籽油的检测。
The findings of DSC （ differential scanning calorimeter） detection of cottonseed oil in rapeseed oil suggest that both cooling and heating DSC thermograms for the two kinds of oil exhibit radical difference. Ther- mal properties of heating thermograms are significantly affected by cottonseed oil addition, even at a mass frac- tion as low as 5 %. Thermal properties of rapeseed oil have a good linear relationship with the addition of cot- tonseed oil. Thermal properties of cooling and heating thermograms, such as Tpeakl ,Tpeak2 and Tpeak5 ,which were the dependent variables to establish simple linear model, the coefficient of determination is greater than 0. 997. The method is convenient and effective,which can be used to detect cottonseed oil contents in rapeseed oil adulterant.
出处
《四川旅游学院学报》
2016年第3期19-22,共4页
Journal of Sichuan Tourism University
关键词
差示扫描量热法
菜籽油
棉籽油
掺伪
differential scanning calorimeter
rapeseed oil
cottonseed oil
adulteration
