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Abstract: A highly selective molecularly imprinted electrochemiluminescence (MIECL) sensor based on molecularly imprinted Fe3O4 nanocrystals (MIP-Fe3O4/NCs) and luminol was developed for bisphenol A (BPA) determination. MIP-Fe3O4-NCs were synthesized and immobilized on the glassy carbon electrode (GCE) surface to fabricate the electrogenerated chemiluminescence (ECL) system. The GCE modified with MIP-Fe3O4-NCs could greatly promote the cathodic ECL of luminol. After incubation with the BPA solution, the imprinting sites on the surface of MIP-Fe3O4-NCs could specifically rebind BPA, resulting in selective and sensitive ECL quenching by hindering electron transfer capability. Under optimal conditions, the relative ECL intensities were proportional to the logarithm of BPA concentration ranging from 0.002 μg/L to 5.0 × 103 μg/L at a limit of detection of 2.0 × 10-4 μg/L. Satisfactory recoveries of 93.5% - 98.3% were obtained in fish and seawater samples at a relative standard deviation of <6.1%. The proposed MIECL sensor displayed good selectivity, high sensitivity, and excellent accuracy and precision. The results demonstrated the potential application of the MIECL sensor for BPA analysis in actual samples and for pollutant analysis
Template and target information: bisphenol A, BPA
Author keywords: bisphenol A, Molecularly imprinted polymers, Fe3O4 nanocrystals, Electrochemiluminescence sensor