Development of molecularly imprinted polymer films used for detection of profenofos based on a quartz crystal microbalance sensor
| Autor: | Chaonan Cheng, Jianwei Dong, Na Gao, Zhixian Gao, Jialei Bai, Yuan Peng, Caihong Zhou, Baoan Ning, Chun Guo, Ming Liu |
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| Rok vydání: | 2012 |
| Předmět: |
Materials science
Scanning electron microscope Nitrogen Polymers Surface Properties Radical polymerization Analytical chemistry Buffers Biochemistry Analytical Chemistry Molecular Imprinting Tap water Monolayer Electrochemistry Environmental Chemistry Sulfhydryl Compounds Electrodes Spectroscopy chemistry.chemical_classification Air Fatty Acids Organothiophosphates Molecularly imprinted polymer Pesticide Residues Water Polymer Quartz crystal microbalance Hydrogen-Ion Concentration chemistry Quartz Crystal Microbalance Techniques Cyclic voltammetry |
| Zdroj: | The Analyst. 137(5) |
| ISSN: | 1364-5528 |
| Popis: | A quartz crystal microbalance (QCM) sensor based on molecularly imprinted ultra-thin films was developed for detecting profenofos in real samples. Films prepared by physical entrapment (MIP-A) and in situ self-assembly (MIP-B) were compared. The results indicated that the best sensing signal was obtained through the in situ self-assembly method. The QCM sensor chip was pretreated with 11-mercaptoundecanoic acid (MUA) to form a self-assembled monolayer (SAM), and then polymer films were immobilized directly on the SAM using surface-initiated radical polymerization. In this paper, all detection experiments were taken in air. The reaction was processed in solution, and the electrode was washed with deionized water and dried with N(2) before QCM measurement. The film was characterized by a scanning electron microscope (SEM), AC impedance and cyclic voltammetry. Analysis of the QCM response in the presence of different concentrations of profenofos showed a good linear correlation during 1.0 × 10(-8) to 1.0 × 10(-5) mg mL(-1) (y = 5log x + 42.5, R = 0.9960) and 1.0 × 10(-5) to 1.0 × 10(-3) mg mL(-1) (y = 25.86log x + 146, R = 0.9959), respectively. The MIP-QCM sensor was used to detect profenofos in tap water, and showed good recovery and repeatability. |
| Databáze: | OpenAIRE |
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