Abstract: A gas chromatographic (GC) method to determine the contents of 16 trans fatty acids in ice cream was established. The 2.0 g samples were pretreated sequentially with 8 mL of hydrochloric acid and 10 mL of anhydrous ethanol, separated on an SP-2560 capillary column, detected by GC with a flame ionization detector (FID) and quantified by the peak area normalization method. Under optimized chromatographic conditions, the limit of detection and limit of quantification of the proposed method were 0.012% and 0.024%, respectively, and it allowed effective separation of trans fatty acid methyl esters from cis fatty acid methyl esters and saturated fatty acid methyl esters.

Key words: ice cream; trans fatty acids; cis fatty acids; saturated fatty acids; gas chromatography

摘要： 建立气相色谱测定雪糕中反式脂肪酸含量的方法。2.0 g雪糕样品中加入8 mL浓盐酸和10 mL无水乙醇进行前处理，经SP-2560毛细管色谱柱分离，气相色谱仪-氢火焰离子化检测器检测，面积归一化法计算组分含量。结果表明：在优化的色谱条件下，方法的检出限和定量限分别为0.012%和0.024%；实现了反式脂肪酸甲酯与顺式脂肪酸甲酯和饱和脂肪酸甲酯的有效分离。

关键词: 雪糕；反式脂肪酸；顺式脂肪酸；饱和脂肪酸；气相色谱法