建立了基质固相分散萃取-高效液相色谱-串联质谱法(MSPD-HPLC-MS/MS)同时测定拟南芥中3种赤霉素GA1,GA3和GA4的分析方法.将拟南芥样品与C18填料混合研磨制成MSPD柱,并采用80%冷甲醇洗脱.采用反相C18色谱柱进行分离,以0.05%甲酸水溶液和乙腈为流动相进行梯度洗脱,采用电喷雾离子源负离子模式(ESI -)电离,多反应监测模式检测.对样品前处理条件、色谱分离条件和质谱检测条件进行了优化,结果表明,在最优条件下,3种赤霉素在10 ~ 300 ng/g范围内均呈良好线性关系,相关系数(r2)均大于0.98,检出限在1.1 ~4.1ng/g之间.在10 ~50 ng/g添加水平下,平均回收率范围为54.7% ~102.6%,相对标准偏差(RSD,n=3)为3.2%~12.8%.该方法操作简单、灵敏度高、选择性好、回收率高,适合拟南芥中GA1、GA3、GA4含量的测定.
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