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Abstract: A molecularly imprinted polymer membrane modified electrode(PPy/CNT/GCEMIP) was developed via the electrochemical polymerization of pyrrole in the presence of carbon nanotube and the molecular template quercetin(Qu).The electrochemical performance of PPy/CNT/GCEMIP was studied by electrochemical impedance spectroscopy(EIS).The electrochemical behaviors of Qu were investigated with cyclic voltammetry(CV) and differential pulse voltammetry(DPV) at the PPy/CNT/GCEMIP.The results showed that a sensitive oxidation peak was observed at 0.184 V in pH 7.0 PBS and the peak current was improved obviously,indicating that PPy/CNT/GCEMIP exhibited good electrocatalytic activity and enrichment towards Qu.Meanwhile,the PPy/CNT/GCEMIP displayed a high selectivity in voltammetric measurements of Qu in the presence of morin with an anodic peak separation value of 263 mV by DPV.Under the optimal conditions,the oxidation peak current of Qu at the modified electrode was linear with the concentration over the range of 1.0 × 10-7-1.0 × 10-3 mol/L with a detection limit of 5.5 × 10-8 mol/L.The relative standard deviation(RSD,n=5) for 1.0 × 10-4 mol/L Qu was 0.2%.With good stability,high selectivity,and wide linear range for the determination of Qu,PPy/CNT/GCEMIP could be applied in the determination of tablets containing Qu.
Template and target information: quercetin, Qu
Author keywords: Carbon nanotube, molecularly imprinted polymer, quercetin, morin, selectivity