青稞酒中53种塑料添加剂检测研究
Food Research and Development(2018)
Abstract
建立超高效液相色谱-串联质谱(ultra-performance liquid chromatography-tandem mass spectrometry,UPLC-MS/MS)法同时测定青稞酒中抗氧化剂、增塑剂、紫外线吸收剂、着色剂等多个类别53种塑料添加剂的高通量快速筛查方法.样品用水稀释至酒精度20%左右,乙腈盐析提取;ACQUITY BEH C18柱(50 mm×2.1 mm,1.7μm),甲醇-0.1%甲酸梯度洗脱分离;电喷雾离子源正离子模式电离(ESI+),多反应监测模式(MRM)分析;外标法定量.结果表明:53种塑料添加剂在较宽浓度范围内线性关系良好,相关系数(r2)均大于0.99,3个添加水平的平均回收率为71.8%~96.3%,精密度(Relative Standard Deviation,RSD)为1.6%~14.7%(n=6).检出限(Detection Limit,LODs)和定量限(Quantification Limit,LOQs)分别为0.2μg/L~40μg/L和0.6μg/L~133μg/L.测定12批次青稞酒样品,共检出20种塑料添加剂,分属于多个类别的化合物.
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