Abstract
The authors describe a method of electrochemiluminescent quantitation of the antibiotic sulfaquinoxaline (SQX). It relies on the use of a molecularly imprinted polymer and a Cu(II)-anchored unzipped covalent triazine framework (UnZ-CCTF) with excellent dispersibility, electrical conductivity, and peroxidaze-like activity. The framework was prepared by unzipping a covalent triazine framework under retention of basic triazine units. It was morphologically and structurally characterized by a range of instrumental techniques. The excellent peroxidase-mimicking effect of UnZ-CCTF on the electrochemiluminescence of the luminol/H2O2 system was exploited to design an ultrasensitive SQX assay with a 1.0–20 pM detection range and a detection limit of 0.76 pM (at 3δ/m). The technique was used for SQX quantitation in spiked milk samples, achieving recoveries of 94.0–104.8%.
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Acknowledgements
This work was supported by the Natural Science Foundation of Hainan Province of China (No. 218MS088), the Central Public-Interest Scientific Institution Basal Research Fund for the Chinese Academy of Tropical Agricultural Sciences (Nos. 1630082017001 and 1630082018003) and Guangxi Natural Science Foundation of China (2018GXNSFAA138089).
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Ma, X., Li, S., Pang, C. et al. A Cu(II)-anchored unzipped covalent triazine framework with peroxidase-mimicking properties for molecular imprinting–based electrochemiluminescent detection of sulfaquinoxaline. Microchim Acta 185, 546 (2018). https://doi.org/10.1007/s00604-018-3079-9
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DOI: https://doi.org/10.1007/s00604-018-3079-9