硅胶表面抗蚜威分子印迹聚甲基丙烯酸的制备及识别特性  

Preparation of Pirimicarb Molecular-Imprinted PMAA on Surface of Silica Gel Particles and Binding Characteristic

作　　者：汪剑[1] 高保娇[1] 郭浩鹏[1] 杨莹[1] 

机构地区：[1]中北大学化学工程系,太原030051

出　　处：《功能高分子学报》2008年第1期44-49,共6页Journal of Functional Polymers

基　　金：山西省自然科学基金项目(MZ20020402)

摘　　要：通过γ-(甲基丙烯酰氧)丙基三甲氧基硅烷的媒介作用,将功能大分子聚甲基丙烯酸(PMAA)逐步接枝到硅胶微粒表面,形成了表面接枝聚甲基丙烯酸的硅胶微粒(PMAA/SiO2);以抗蚜威为模板分子、乙二醇二缩水甘油醚(EGDE)为交联剂,通过氢键和静电作用,对接枝到硅胶表面的PMAA进行分子印迹,制备了抗蚜威分子表面印迹材料硅胶表面分子印迹聚甲基丙烯酸MIP-PMAA/SiO2;采用静态与动态两种方法研究了MIP-PMAA/SiO2对抗蚜威的结合特性,并考察了主要印迹条件pH、混合溶剂中乙醇含量以及交联剂用量对印迹材料结合选择性能的影响。结果表明:表面印迹材料MIP-PMAA/SiO2对抗蚜威具有特异的结合选择性,相对于参比物残杀威,印迹前PMAA/SiO2对抗蚜威的吸附选择系数为1.52,而表面印迹材料MIP-PMAA/SiO2对抗蚜威的吸附选择系数提高到12.2。另外该印迹材料具有优良的洗脱与再生性能。Polymethylacrylic acid （PMAA） was grafted onto the surface of silica gel particles with the mediation of 3-methacryloxypropyl trimethoxysilane （MPS）, and the grafting particles PMAA/SiO2 were formed. Molecular imprinting was carried out against the grafted PMAA on the surface of silica gel using pirimicarb as a template and ethylene glycol diglycidyl ether （EGDE） as crosslinking agent, and the surface-molecular imprinted material MIP-PMAA/SiO2 was obtained. The binding property of MIP-PMAA/ SiO2 for pirimicarb was studied with both static and dynamic methods, and the effects of main imprinting conditions, such as pH value,ethanol content in the solvent and the amount of crosslinking agent, on the binding properties of MIP-PMAA/SiO2 were examined. The experiment results show that MIP-PMAA/ SiO2 has excellent binding selectivity for pirimicarb. In respect to the reference substance propoxur, its selectivity coefficient for pirimicarb is enhanced from 1. 52 before imprinting to 12. 19. Besides, MIP-PMAA/SiO2 has fine elution property, and it is easy to be regenerated and reused.

关 键 词：聚甲基丙烯酸 硅胶 分子印迹 表面印迹 抗蚜威 

分 类 号：O647[理学—物理化学]