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将聚(甲基丙烯酸-乙二醇二甲基丙烯酸酯)(poly(MAA-co-EDMA))聚合物原位聚合于玻璃内插管外表面上,得到一种多孔聚合物涂层;将其作为搅拌棒吸附萃取的萃取介质,考察了其对磺胺类药物的萃取性能;最后将其与高效液相色谱-电喷雾质谱(HPLC-ESI-MS)联用,建立了一种牛奶中4种磺胺类药物的检测方法.在最佳条件下,牛奶中4种磺胺类药物的检出限(S/N=3)和定量限(S/N=10)分别为0.11~0.52 μg/L和0.35~1.72μg/L.在1~500μg/L的范围内峰面积与质量浓度具有良好的线性关系,日内、日间测定的相对标准偏差不高于11.3%.结果表明,该方法简便、灵敏度高且成本低,适合于牛奶中磺胺类药物的检测.

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