对采集的7类76种食品中的反式脂肪酸(TFAS)异构体构成及其含量进行调查。采用气相色谱内标法测定反式脂肪酸(TFAS)含量。结果表明:68%样品中的TFAS含量≤0.3 g/100 g,29%样品的TFAS含量在0.3～2.0 g/100 g,只有3%样品的TFAS含量>2 g/100 g。除锅巴和膨化食品外,被检食品中的TFAS异构体的组成主要是以C18∶1t为主,其C18∶1 t总量占总TFAS含量的60%～96%,说明反式脂肪酸(TFAS)广泛存在于被检的各类食品中,除含人造奶油、代可可脂高的少数食品外,绝大多数食品中的TFAS含量水平不高。

Trans fatty acids content and composition of 76 food products of 7 seven kinds of food were surveyed.This paper utilizes an internal standard(IS) to determine the content of trans fatty acids.The results showed that the contents of TFAs in 68% of samples were not higher than 0.3 g/100g,in 29% of samples were ranging from 0.3 to 2.0 g/100g,in 3% of samples were higher than 2 g/100g.In addition to rice crust and the puffed food,the main kind of TFAs was C18∶ 1t.The total content of C18∶ 1t accounted for 60%~96% of total TFAs.Conclusion Except a few foods,TFAs was widely present in most of foods with low levels.