建立了马铃薯、洋葱、大蒜中马来酰肼(MH)的高效离子排斥色谱(HPIEC)检测方法.样品经提取、净化、过滤后进行色谱分析,以3 mmol/L 甲酸水溶液-乙腈(70:30, v/v)为流动相,流速0.8 mL/min,采用Ionpac ICE-AS1(250 mm×9 mm)HPIEC色谱柱分离,紫外检测波长205 nm,外标法定量.结果表明,MH的线性范围为0.006～1.0 mg/L,相关系数为 0.9999,回收率为91% ～103% ,相对标准偏差(RSD)均小于3% ,检出限为0.002 mg/L (S/N=3).该方法灵敏度高,前处理简便,可用于马铃薯、洋葱、大蒜中MH的检测.
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