建立了分离反式油酸(C18∶1)、亚油酸(C18∶2)、亚麻酸(C18∶3)的银离子固相萃取-气相色谱(Ag+-SPE/GC)方法,并应用于乳脂肪中反式脂肪酸的检测.采用自制的银离子固相萃取柱对样品进行预分离,总脂肪酸甲酯化后上样,依次经9 mL甲苯-正己烷(体积比5∶95)、8 mL甲苯-正己烷(体积比17∶83)、6 mL甲苯-乙酸乙酯(体积比17∶83)、10 mL甲苯-乙酸乙酯(体积比30∶70)洗脱并分别收集洗脱液,采用气相色谱分别进行检测.结果显示,除了反式亚麻酸的回收率为69.9%~101.0% 、相对标准偏差(RSD)为11.0% ~18.1%外,其余的反式脂肪酸的回收率均为88.4% ~107.2% 、RSD为1.2% ~11.9% .该方法通过特异性固相萃取的方法对样品进行前处理,较好地避免了样品中顺式及饱和脂肪酸对反式脂肪酸检测的干扰.
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