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| Study on a Molecularly Imprinted Electrochemical Sensor with Chitosan as the Substrate for Determination of Fenthion |
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| DOI： |
| KeyWord:chitosan molecular imprinting fenthion signal enhancement gating effect |
| Author | Institution |
| LING Jun，YANG Guang-wei，LI Jian-ping |
1. College of Environmental Science and Engineering，Guilin University of Technology，Guilin ，China; 2. College of Chemistry and Bioengineering，Guilin University of Technology，Guilin ，China |
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| Abstract: |
| A molecularly imprinted electrochemical sensor based on chitosan modified layer was fabricated for the detection of fenthion．For the first time，the adsorption enrichment of the modified electrode to the probe ions was used to improve the sensitivity of the molecular imprinted sensor．The response process of the sensor was characterized by electrochemical impedance spectroscopy and cyclic voltammetry．The experimental conditions such as elution，resorption and probe enrichment time were optimized．The sensitization effect of chitosan on the "gate control effect" measurement mode was investigated．Under the optimized conditions，the detection range of the sensor for fenthion was 1－10 000 pg/mL，with a detection limit of 0.35 pg/mL．The sensor was successfully used for the determination of fenthion in vegetables and fruits samples．The spiked recoveries ranged from 99.0% to 109%，with relative standard deviations of 1.9%－2.9%． |
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