磁性印迹聚合物Fe3O4@MIPs的制备及其在食用油塑化剂检测样品前处理中的应用

    Preparation of Magnetic Imprinted Polymers Fe3O4@MIPs and Application in Sample Pretreatment of Plasticizer Detection of Edible Oil

      摘要
    • 摘要: 对分子印迹聚合物进行磁性修饰，磁性印迹聚合物的合成条件为邻苯二甲酸二正辛酯(模板)、α-甲基丙烯酸(单体)和乙二醇二甲基丙烯酸酯(交联剂)的物质的量比为1∶6∶30、引发剂用量为单体和交联剂总质量的2.5%、温度70 ℃、反应时间8 h。利用紫外-可见分光光度法测定其吸附性能。选择性吸附试验结果显示，磁性印迹聚合物对5种邻苯二甲酸酯类物质的吸附量分别为1.34、1.45、1.12、1.50、1.72 mg/g；磁性非印迹聚合物对上述5种物质的吸附量分别为0.79、0.60、0.75、0.68、0.73 mg/g。结果表明，印迹聚合物比非印迹聚合物有更好的选择吸附性。通过实际样品分析试验可知，合成的磁性印迹聚合物对食用油中塑化剂的吸附性优于市面上的商品柱，可用于食用油中邻苯二甲酸二正辛酯类塑化剂检测的样品前处理。

       

      Abstract: Magnetic imprinted polymers were prepared by the modification of molecular imprinted polymers using magnetic materials by suspension polymerization. The modification conditions were 1∶6∶30 molar ratio of di-n-octylo-phthalate (template) to alpha methyl acrylic acid (monomer) to ethylene glycol dimethyl acrylate (cross-linking agent), 2.5% of initiator dosage (relative to the total weight of all monomers and cross linker), temperature 70 ℃, time 8 h. Magnetic imprinted polymers were characterized and their adsorption property was studied by UV-Vis spectrophotometry. Results showed that the adsorption amounts of magnetic imprinted polymers on dimethyl phthalate, dibutyl phthalate, benzyl butyl phthalate, di-n-pentyl phthalate and di-n-octylo-phthalate were 1.34, 1.45, 1.12, 1.50 and 1.72 mg·g-1, respectively. The adsorption amounts of magnetic non-imprinted polymers on these substances were 0.79, 0.60, 0.75, 0.68 and 0.73 mg·g-1, respectively. These results showed that imprinted polymer had better selective adsorption capacity than non-imprinted polymer. Actual sample analysis results showed that the magnetic imprinted polymers was superior to commercial column in adsorption capacity of plasticizer in edible oil, and could be used for sample pretreatment of di-n-octyl phthalate plasticizer detection of edible oil.

       

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