Journal
MICROCHIMICA ACTA
Volume 185, Issue 2, Pages -Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-018-2701-1
Keywords
Anion detection; Nanozymes; Glutathione; Metal nanocluster; Enzyme mimicking; Fluorescence
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Funding
- National Natural Science Foundation of China (NSFC) [21605012]
- Scientific and Technological Research Program of Chongqing Municipal Education Commission [KJ1600301]
- Program for Top-Notch Young Innovative Talents of Chongqing Normal University [02030307-00043]
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The authors report that sulfide ions are capable of inhibiting the peroxidase-like activity of copper nanoclusters (CuNCs). The catalytic activity of CuNCs toward the oxidation of the chromogenic substrate 3,3',5,5'-tetramethylbenzidine by H2O2 is remarkably decreased in the presence of sulfide. Based on this finding, a colorimetric assay was developed for the rapid determination of sulfide. Best operated at a wavelength of 652 nm, it has a 0.5 mu M detection limit. The method is highly selective and has been successfully applied to the quantification of sulfide in environmental water samples.
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