Key Laboratory of Analytical Chemistry of the State Ethnic Affairs Commission, College of Chemistry and Materials Science, South-Central University for Nationalities, Minyuan Road 708#, Wuhan 430074, China.
Biosens Bioelectron. 2010 Oct 15;26(2):868-71. doi: 10.1016/j.bios.2010.07.085. Epub 2010 Jul 30.
A methyl parathion-templated molecularly imprinted porous silicate thin film was electrodeposited onto a glassy carbon electrode using tetraethylorthosilicate sol as the silicon precursor and vinyltriethoxysilane as the functional monomer. The surface morphology and crystallinity of the imprinted film were characterized by scanning electron microscope and X-ray diffraction. The binding performance of the film with methyl parathion was examined with voltammetric techniques. The results show that the imprinted sol-gel film gives fast, sensitive and selective response to methyl parathion. The good selectivity of the film allows fine discriminations of methyl parathion from interferants, which including parathion, α-hydroxyl-4-nitrophenyl-dimethyl-phosphonate, p-nitrophenol and nitrobenzene. A linear range for methyl parathion determination was found from 1.0×10(-8) to 1.0×10(-5) mol l(-1) with an estimated detection limit of 8.9×10(-9) mol l(-1) (S/N=3). This imprinted sol-gel film electrode was proved to be a versatile sensing tool for the selective detection of methyl parathion in real samples.
采用正硅酸乙酯溶胶为硅源，乙烯基三乙氧基硅烷为功能单体，通过电化学沉积法在玻碳电极上制备了甲基对硫磷分子印迹多孔硅薄膜。采用扫描电子显微镜和 X 射线衍射对印迹膜的表面形貌和结晶度进行了表征。采用电化学技术考察了印迹膜对甲基对硫磷的结合性能。结果表明，印迹溶胶-凝胶膜对甲基对硫磷具有快速、灵敏和选择性的响应。该膜具有良好的选择性，可精细地区分甲基对硫磷与干扰物，包括对硫磷、α-羟基-4-硝基苯基-二甲基膦酸、对硝基苯酚和硝基苯。在 1.0×10(-8)~1.0×10(-5) mol·L(-1)范围内，发现了甲基对硫磷的线性测定范围，检测限估计为 8.9×10(-9) mol·L(-1)（S/N=3）。该印迹溶胶-凝胶膜电极被证明是一种用于实际样品中选择性检测甲基对硫磷的通用传感工具。
