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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 x 10-9 mol/L to 8 x 10-7 mol/L exists, and the detection limit was 3.7 x 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
Template and target information: clopyralid
Author keywords: Molecularly imprinted sensors, Gate controlled, Electrochemical luminescence, Clopyralid