研究了反相高效液相色谱(RP-HPLC)流动相中酸性离子抑制剂三氟乙酸(TFA)与缓冲盐离子抑制剂TFA-乙酸铵( AmAc)对安赛蜜、糖精、咖啡因、阿斯巴甜、苯甲酸、山梨酸、甜菊糖苷、脱氢乙酸和纽甜等9种食品添加剂色谱保留行为的影响.着重探讨了TFA与TFA-AmAc作为离子抑制剂的有机调节剂作用,考察了乙腈-TFA水溶液和乙腈-TFA-AmAc水溶液流动相体系中溶质的保留因子与离子抑制剂体积分数之间的关系.在最佳流动相组成(乙腈-TFA (0.01%,v/v)-AmAc (2.5 mmol/L)水溶液)条件下梯度洗脱,苯甲酸等9种食品添加剂实现了基线分离.9种食品添加剂在10.0~100.0 mg/L内具有良好的线性关系(r2>0.9991);检出限为0.33 ~2.36mg/L,定量限为1.11 ~7.80 mg/L;9种食品添加剂在空白干红葡萄酒中的添加回收率为87.61%~108.4%,其相对标准偏差为2.2% ~9.4%.本实验结果对于食品中多组分食品添加剂的RP-HPLC分离分析方法的建立和优化具有较好的指导意义.
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