关于地沟油极性组分指标的研究

目的 研究地沟油极性组分的共同特性, 为有效检测地沟油提供参考。方法 用石油醚: 乙醚分离地沟油与杂质, 挥干有机溶剂后用柱层分析法进行极性组分指标测定。 结果 所检测到的地沟油的极性组分含量值为23.37 % ±3.33 %(在15.71 % ~32.50 %之间), 而未经烹饪过的正常食用油的极性组分含量值明显较低, 为4.55 % ±1.41 %(在3.05%~6.76%之间)。地沟油和未经烹饪油的层析柱洗脱物的比较也有较明显的差异。 结论 可以用柱层分析法检测区分正常食用油与地沟油。

Research on indicators of polar compounds of swill-cooked dirty oil

Objective To study the common characteristics of polar compounds in swill-cooked dirty oil so as to provide efficient references for identification. Methods The samples of swill-cooked dirty oil were separated from impurities by petroleum ether and ether, and their content ratios of polar compounds were determined by column chromatography. Results The content ratios of polar compounds of the swill-cooked dirty oil were 23.37% ± 3.33 % (between 15.71%~32.50%), showing higher than those of uncooked edible oil (4.55% ±1.41 %, between 3.05% ~6.76%). The final elutes showed significant dif-ferences between swill-cooked dirty oil and uncooked oil by column chromatography. Conclusion The swill-cooked dirty oil can be identified from uncooked edible oil by column chromatography.