Clopyralid detection by using a molecularly imprinted electrochemical luminescence sensor based on the “gate-controlled” effect
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A new strategy for trace analysis was proposed by preparing a molecularly imprinted polymer (MIP) sensor. The template molecules of clopyralid were determined based on “gate-controlled” electrochemiluminescence (ECL) measurement. A dense polymer film was electropolymerized on an electrode surface to fabricate the MIP–ECL sensor. The process of template elution and rebinding acted as a gate to control the flux of probes, which pass through the cavities and react on the electrode surface. ECL measurement was conducted in the luminol–H2O2 system. A linear relationship between ECL intensity and clopyralid concentrations in the range of 1 × 10−9 mol/L to 8 × 10−7 mol/L exists, and the detection limit was 3.7 × 10−10 mol/L. The prepared sensor was used to detect clopyralid in vegetables. Recoveries of 97.9 % to 102.9 % were obtained. The sensor showed highly selective recognition, high sensitivity, good stability, and reproducibility for clopyralid detection.
KeywordsMolecularly imprinted sensors Gate controlled Electrochemical luminescence Clopyralid
The authors gratefully acknowledge the financial support of the National Natural Science Foundation of China (No. 21375031 and No. 21165007).
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