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Reusable Molecularly Imprinted Electrochemiluminescence Assay for Kanamycin Based on Ordered Mesoporous Carbon Loaded with Indium Oxide Nanoparticles and Carbon Quantum Dots

Overview
Journal Mikrochim Acta
Specialties Biotechnology
Chemistry
Date 2022 Oct 25
PMID 36284001
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Abstract

A highly sensitive kanamycin electrochemiluminescence (ECL) switch sensor was constructed. A signal element consisting of ordered mesoporous carbon loaded with indium oxide nanoparticles/carbon quantum dots (OMC/InO/C-dots) was assembled on the surface of a gold electrode. Then, a molecularly imprinted polymer (MIP) was prepared on the modified electrode surface using kanamycin as the template molecule and o-aminophenol as the functional monomer. After kanamycin elution, the prepared sensor retained specific kanamycin recognition sites. OMC/InO effectively amplified the ECL signal of the C-dots, thereby enhancing the detection sensitivity, whereas kanamycin quenched the signal. Therefore, the imprinted sites acted as a switch, providing a new method for detecting kanamycin. Under the optimal experimental conditions, the concentration of kanamycin was proportional to the degree of ECL quenching within a linear range of 5-4500 × 10 mol L at 0.8 V (vs. Ag/AgCl electrode electrode), and the detection limit was 5.8 × 10 mol L. When applied to the detection of kanamycin in actual samples, such as chicken, duck, pork, and milk, the recovery for spiked samples was in the range 92.7-110%.

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