Abstract
A novel and efficient colorimetric assay was developed for the detection of copper ions (Cu2+) in real environmental water based on analyte-mediated peroxidase-mimicking activity enhancement of cysteine-capped silver nanoparticles (RSH-AgNPs). These RSH-AgNPs show a synergetic effect in the form of peroxidase-mimicking activity enhancement by analyte mediation, and free RSH-AgNPs alone have weak catalytic properties. While coexisting with Cu2+, RSH-AgNPs possess excellent enzymatic activity due to the dissociation of cysteine on the interface of silver nanoparticles caused by Cu2+ and exposing the catalytic sites of AgNPs, which can catalyze the decomposition of hydrogen peroxide and trigger the oxidation of 3,3',5,5'-tetramethylbenzidine, leading to a change in color from colorless to blue. Using this strategy, Cu2+ could be determined within a wide linear range of concentrations (0.1 to 83 μM) with the detection limit of 0.08 μM using colorimetric detection. This method has excellent anti-interference capability and is effective and reliable for the determination of Cu2+ in real water samples.
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Funding
We thank the supports from the National Natural Science Foundation of China (nos.: 51704127, 21605105 and 21705060), Major national projects (MC-202003-Z01-07) and the Social Development Fund of Zhenjiang City (SH2018011).
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Peng, H., Qiu, L., Xue, Q. et al. Analyte-Mediated Peroxidase-Mimicking Activity Enhancement of Cysteine-Capped Silver Nanoparticles for Colorimetric Detection of Copper Ions. J Anal Chem 78, 471–479 (2023). https://doi.org/10.1134/S1061934823040123
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DOI: https://doi.org/10.1134/S1061934823040123