期刊
CHROMATOGRAPHIA
卷 69, 期 11-12, 页码 1353-1361出版社
VIEWEG
DOI: 10.1365/s10337-009-1062-7
关键词
Surface molecular imprinting; Poly(methacrylic acid); Pirimicarb; Silica gel particle; Recognition selectivity
资金
- Science Foundation of Shanxi Province, China
Methacrylic acid (MAA) was graft-polymerized on to the surface of silica gel particles in the grafting from manner, resulting in grafted PMAA/SiO(2) particles. By adopting the novel surface molecular imprinting technique proposed by us not long ago, pirimicarb molecule-imprinted material MIP-PMAA/SiO(2) was prepared with ethylene glycol diglycidyl ether (EGGE) as crosslinking agent. The effects of imprinting conditions, for example pH of the medium, solvent composition, and reactant ratio, on the recognition selectivity of MIP-PMAA/SiO(2) for pirimicarb relative to the analog, propoxur, were examined, and the optimum imprinting conditions were determined. The dependence of the rebinding ability of MIP-PMAA/SiO2 for pirimicarb on the performance conditions, for example pH and salinity of the medium, were also studied. The experimental results showed that optimum imprinting conditions for preparing pirimicarb molecule-imprinted MIP-PMAA/SiO(2) material with high recognition selectivity were: solvent pH 8, mixed solvent composition 1:1 (v/v) ethanol to water, and 3:1 reactant molar ratio of carboxyl groups of the grafted PMAA to the crosslinking agent EGGE. This reactant ratio is consistent with the speculated mode of intermolecular interaction between the grafted functional macromolecule PMAA and the template pirimicarb. The rebinding ability of MIP-PMAA/SiO(2) for pirimicarb is highly dependent on the performance conditions. At medium pH 8, MIP-PMAA/SiO(2) has the strongest binding ability for pirimicarb because this condition results in the greatest the number of active sites inside the imprinted cavities suitable for the binding of pirimicarb. A saline, i.e., high ionic strength, medium is disadvantageous to rebinding ability Of MIP-PMAA/SiO(2) for pirimicarb.
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