建立了气相色谱-质谱技术(GC-MS)分析香稻特征化合物2-乙酰基吡咯啉的方法.在香稻中加入内标物2,4,6-三甲基吡啶,密闭,经无水乙醇-二氯甲烷(体积比为1∶1)在80 ℃水浴中提取3 h.考察了温度和时间对2-乙酰基吡咯啉提取的影响.提取液经毛细管气相色谱柱HP-5MS(30 m×0.25 mm×0.25 μm)分离,全扫描监测模式GC-MS测定.以内标物计,方法的平均回收率为82.57% ,相对标准偏差为5.09% ,最低检出限为0.01 mg/kg.将该方法应用于11份香稻育种材料中2-乙酰基吡咯啉的测定,结果表明,清香米、泰香R207、Texmati、桂香丝糯和中健2号等5个品种中含有2-乙酰基吡咯啉,含量分别为0.097、0.098、0.699、0.045和0.047 mg/kg.该方法样品处理简单、快速、灵敏、样本和试剂消耗少,尤其适合于通过测定2-乙酰基吡咯啉含量进行香稻育种前的大批量品种筛选.
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