Abstract
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.
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The authors gratefully acknowledge the financial support of the National Natural Science Foundation of China (No. 21375031 and No. 21165007).
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Li, X., Li, J., Yin, W. et al. Clopyralid detection by using a molecularly imprinted electrochemical luminescence sensor based on the “gate-controlled” effect. J Solid State Electrochem 18, 1815–1822 (2014). https://doi.org/10.1007/s10008-014-2380-8
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DOI: https://doi.org/10.1007/s10008-014-2380-8