建立了在线光化学衍生、荧光检测、高效液相色谱( HPLC)测定辣椒油中苏丹红Ⅰ、Ⅱ、Ⅲ和B的方法.以乙腈-水为流动相,采用梯度洗脱方式在SB-C18色谱柱上分离.用实验室自制的程序控制时间/光强光化学反应器作为在线衍生装置,优化了光衍生反应的条件和荧光检测条件.3种不同加标浓度下,辣椒油样品中4种苏丹红染料的加标回收率为81.3％ ～ 100.4％.加标水平为0.8 mg/kg下荧光信号强度的相对标准偏差(RSD,n=6)为2.6％～3.8％.苏丹红Ⅰ、Ⅱ、Ⅲ和B的检出限(LOD)和定量限(LOQ)范围分别为0.009～0.054 mg/kg和0.030～0.181 mg/kg,优于传统的HPLC分离、二极管阵列检测器检测方法.该方法具有简单、灵敏、选择性好的特点,适用于食品样品中苏丹红的常规分析.
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