Fluorometric determination of mercury(II) using positively charged gold nanoparticles, DNA-templated silver nanoclusters, T-Hg(II)-T interaction and exonuclease assisted signal amplification.

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ID: 73259
2019
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Abstract
The authors describe a method for detection of Hg by using positively charged gold nanoparticles ((+)AuNPs) as a quencher of the fluorescence of DNA-capped silver nanoclusters (DNA-AgNCs) which are negatively charged. In the presence of Hg, a DNA duplex is formed through T-Hg-T coordination chemistry. The duplex can be digested by exonuclease III to form smaller DNA fragments. This leads to the release of the AgNCs and the recovery of fluorescence, best measured at excitation/emission wavelengths of 460/530 nm. The (+)AuNPs and Hg are also released and can be reused for target recycling signal amplification. Based on these findings, a method is worked out for the determination of Hg that works in the 5.0 pM to 10 nM concentration range and has a detection limit as low as 2.3 pM. It is highly selective because of the highly specific formation of T-Hg-T bonds. Graphical abstract By using ultrastable and positively charged gold nanoparticles as fluorescence quenchers and exonuclease assisted signal amplification, a method is developed for the sensitive and selective detection of Hg in water samples.
Reference Key
ma2019fluorometricmikrochimica Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Ma, Haiyan;Xue, Ning;Wu, Shujie;Li, Zongbing;Miao, Xiangmin;
Journal Mikrochimica acta
Year 2019
DOI
10.1007/s00604-019-3388-7
URL
Keywords
dna/silver nanoclusters exonuclease iii amplification fluorometric assay hg2+ detection positively charged gold nanoparticles

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