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首页> 外文期刊>Talanta: The International Journal of Pure and Applied Analytical Chemistry >Tuning of the vinyl groups' spacing at surface of modified silica in preparation of high density imprinted layer-coated silica nanoparticles: A dispersive solid-phase extraction materials for chlorpyrifos
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Tuning of the vinyl groups' spacing at surface of modified silica in preparation of high density imprinted layer-coated silica nanoparticles: A dispersive solid-phase extraction materials for chlorpyrifos

机译：制备高密度压印层涂二氧化硅纳米粒子时，对改性二氧化硅表面乙烯基间距的调节：毒死rif的分散固相萃取材料

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摘要

This paper reports the preparation of high density imprinted layer-coated silica nanoparticles toward selective recognition and fast enrichment of chlorpyrifos (CP) from complicated matrices. The molecularly imprinted polymers (MIPs) were successfully coated at the surface of modified silica through using the chemical immovable vinyl groups at the nanoparticles' surface, followed by the graft copolymerization of methacrylic acid (MAA) and ethylene glycol dimethacrylate (EGDMA) in the presence of templates CP. It has been demonstrated that the space of end vinyl groups at the surface of silica can be controlled by changing the condition of chemical modification, regulating the thickness of imprinted shells and the density of efficient imprinted sites. After removal of templates by solvent extraction, the recognition sites of CP were created in the polymer coating layer. The CP-imprinted nanoparticles exhibited high recognition selectivity and binding affinity to CP analyte. When the CP-imprinted nanoparticles were used as dispersive solid-phase extraction (dSPE) materials, the high recovery yields of 76.1-93.5% from various spiked samples with only 1 mu g/mL analyte were achieved by one-step extraction. These results reported herein provide the possibility for the separation and enrichment of CP from complicated matrices by the molecular imprinting modification at the surface of common silica nanoparticles.
机译：本文报道了从复杂基质中选择性识别和快速富集毒死rif（CP）的高密度印迹层包覆二氧化硅纳米粒子的制备。通过在纳米颗粒表面使用化学固定的乙烯基，将分子印迹聚合物（MIP）成功地涂覆在改性二氧化硅的表面，然后在存在的情况下进行甲基丙烯酸（MAA）和乙二醇二甲基丙烯酸酯（EGDMA）的接枝共聚。模板CP。已经证明，可以通过改变化学改性条件，调节压印壳的厚度和有效压印位点的密度来控制二氧化硅表面上末端乙烯基的空间。通过溶剂萃取除去模板后，在聚合物涂层中产生CP的识别位点。 CP印迹纳米颗粒显示出高识别选择性和对CP分析物的结合亲和力。当CP印迹纳米颗粒用作分散固相萃取（dSPE）材料时，通过一步萃取即可从仅加1μg/ mL分析物的各种加标样品中获得76.1-93.5％的高回收率。本文报道的这些结果提供了通过普通二氧化硅纳米粒子表面的分子印迹修饰从复杂基质中分离和富集CP的可能性。

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