采用超高效液相色谱-串联质谱(UHPLC-MS/MS)技术,建立了贻贝、牡蛎、蚌类、扇贝等食用贝类及其制品中3种天然形式的原多甲藻酸(azaspiracid-1,azaspiracid-2,azaspiracid-3)贝类毒素的检测方法.样品采用乙腈-水(85:15,v/v)混合液均质提取,应用QuEChERS技术净化,以0.2μm微孔滤膜过滤,在乙腈-水(含5 mmol/L醋酸铵和0.1%甲酸)体系下进行梯度洗脱,并在ZORBAX Eclipse Plus C18柱(100 mm×2.1 mm,1.8 μm)上实现3种贝类毒素的基线分离.该方法采用多反应监测(MRM)模式扫描,采用标准曲线外标法定量.3种原多甲藻酸在1~ 100 μg/kg范围内线性关系良好,相关系数(r2)均大于0.995;3种贝类毒素的定量限(S/N=10)均为1.0μg/kg;在10、20和50 μg/kg 3个加标水平的添加回收率在71% ~ 108%之间,日内和日间测定的相对标准偏差≤10%(n=6).应用该方法对国内外多个地区的贝类产品进行了筛查测定,发现部分样品的测定结果为阳性.该方法灵敏度高,重复性好,操作简便、快捷,适用于食用贝类及其制品中3种原多甲藻酸贝类毒素的分析测定.
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