【摘要】 以表面修饰双键的Fe3O4@SiO2纳米颗粒为基体,以萘夫西林(nafcillin)为模板,甲基丙烯酸(MAA)为单体,乙二醇二甲基丙烯酸酯(EGDMA)为交联剂,偶氮二异丁腈(AIBN)为引发剂,采用三步升温聚合法合成了核壳结构的萘夫西林磁性分子印迹聚合物。采用傅里叶变换红外光谱仪(FT-IR)、透射电子显微镜(TEM)、X射线衍射仪(XRD)和振动样品磁强计(VSM)对制备的印迹聚合物微球进行了表征,得到的磁性印迹聚合物微球的粒径在320 nm左右,大小均匀,分散性较好,可以在外加磁场下与溶剂实现快速分离。对磁性印迹和非印迹聚合物进行了吸附性能研究,结果表明该印迹聚合物微球对模板分子具有很高的吸附容量(50.7mg/g),特异性识别性能良好(印迹因子为2.46),有望应用于实际样品中萘夫西林残留量的富集分析。更多还原

【Abstract】 The uniform core-shell nanostructuredmagneticmolecularly imprinted polymers(MIPs)were synthesized using antibiotic nafcillin as a template.In this protocol,themagnetite nanoparticles(NPs)were synthesized by the solvothermal reaction firstly.Subsequently,the vinyl groups were grated onto silica-modified Fe3O4 surface by 3-methacryloyloxypropyltrimethoxysilane via sol-gelmethod.Finally,the nafcillin-MIPs film was formed on the surface of Fe3O4@ SiO2 by the copolymerization of vinyl end group with functionalmonomer,methacrylic acid,cross-linking agent,ethylene glycol dimethacrylate,the initiator azo-bis-isobutyronitrile and templatemolecule.Themorphological andmagnetic characteristics of the MIPs were characterized by transmission electronmicroscopy,Fourier transform infrared spectroscopy,X-ray diffraction and vibrating samplemagnetometer.The obtained sphericalmagnetic MIPs with diameters of about 320 nm had goodmonodispersity.The static binding experiment was carried out to evaluate the properties ofmagnetic MIPs and non imprinted polymers(NIPs).The results demonstrated that themagnetic MIPs had high adsorption capacity to template and good selectivity.The imprinting factor and themaximum adsorption capacity of Fe3O4@ MIPs to nafcillin were 2.46 and 50.7mg/g,respectively.It is expected that the preparedmagnetic MIPs could be used for the enrichment of nafcillin in complex samples.更多还原