色谱法
分子印迹聚合物
固相萃取
质谱法
化学
检出限
萃取(化学)
头孢菌素类抗生素
头孢菌素
抗生素
选择性
生物化学
催化作用
作者
Ya-xin Hao,Minli Yang,Xiangfeng Chen,Feng Zhang,Na Li,Muyi He,Xiuli Xu
标识
DOI:10.1021/acs.jafc.3c01527
摘要
A magnetic molecularly imprinted polymer (MMIP) coupled nanospray ion source was developed for analysis of cephalosporin antibiotics in food samples. MIP coated Fe3O4 nanospheres were prepared for magnetic solid-phase extraction (MSPE) of the antibiotics in the extract of samples and then integrated into the nanospray capillary for further desorption and mass spectrometry analysis. The developed device combines the advantages of high extraction efficiency of MSPE, unique selectivity of MIPs, and fast analysis speed of ambient ionization mass spectrometry (AIMS). Five cephalosporin antibiotics in milk, egg, and beef samples were analyzed using the developed methods. High sensitivities with limits of detection (LODs) from 0.3 to 0.5 μg kg–1 were achieved for cephalosporin antibiotics in milk, egg, and beef samples, respectively. Good linearity, determination coefficient values (R2 > 0.992), and precision (RSD < 15%) with recoveries ranging from 72.6% to 115.5% were obtained using the spiked milk, egg, and beef sample matrices.
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