不同植物油制取工艺对毛油中多环芳烃含量的影响

摘要

以花生仁、芝麻、油菜籽为原料,采用不同工艺分别制取毛油,并对毛油中多环芳烃(PAHs)含量进行检测分析,探究制油工艺对毛油中PAHs含量的影响.结果表明:6个浸出毛油样品中BaP、PAH4、PAH16平均含量分别是6个压榨毛油样品的1.53、1.45、1.08倍,说明PAHs在浸出溶剂正己烷中有很好的溶解度,因此油籽无论脱皮与否所制取浸出毛油中PAHs含量均高于压榨毛油;6个脱皮油籽所制取毛油中BaP、PAH4、PAH16平均含量分别是未脱皮油籽毛油的1.51、1.61、1.53倍,即无论是压榨法还是浸出法,脱皮油籽所制取毛油中PAHs含量均高于未脱皮油籽毛油.这可能是因为种皮主要成分为粗纤维,而PAHs的亲脂性使其更容易富集在种仁中.%The peanut kernel,sesame and rapeseed were used as raw materials to prepare crude oils by different oil-producing technologies.Then,the PAHs contents in the crude oils were detected and analyzed to study the effect of different oil-producing technologies on PAHs content in crude oil.The results showed that the average contents of BaP,PAH4 and PAH16 in six extracted crude oils were 1.53,1.45 times and 1.08 times as much as those in pressed crude oils,respectively.The possible reason was that PAHs had good solubility in n-hexane.Therefore,the PAHs contents in extracted crude oils were higher than those in pressed crude oils whether the oilseeds were peeled or not.The average contents of BaP,PAH4 and PAH16 in six crude oils derived from the peeled oilseeds were 1.51,1.61 times and 1.53 times as much as those in crude oils derived from the whole oilseeds,respectively.Therefore,the PAHs contents in crude oils derived from peeled oilseeds were higher than those in crude oils derived from whole oilseeds whether the crude oils were produced by leaching or pressing.The possible reason was that the main component of oilseed coat was crude fiber,resulting that the lipophilic PAHs were more easily accumulated in the kernel.