Issue 9, 2013

Highly sensitive and selective colorimetric detection of iodide based on anti-aggregation of gold nanoparticles

Abstract

A simple and reliable colorimetric detection method for iodide has been well established based on the anti-aggregation effect of AuNPs in this paper. This assay is highly sensitive and selective toward iodide over other interferent anions due to the high stability of the inorganic complex formed between Hg2+ and iodide. In the absence of iodide, T-rich single-stranded DNA (ssDNA) can specifically bind with Hg2+ to form a stable T–Hg2+–T complex, inducing the solution color change from wine-red to finally violet blue with increasing concentration of Hg2+. However, when Hg2+ is first treated with iodide, the T–Hg2+–T interaction will be interrupted, which results in the anti-aggregation of AuNPs. A linear response from 4 × 10−8 to 4 × 10−6 M was obtained for iodide, and a detection limit of 13 nM was achieved.

Graphical abstract: Highly sensitive and selective colorimetric detection of iodide based on anti-aggregation of gold nanoparticles

Article information

Article type
Paper
Submitted
22 Dec 2012
Accepted
07 Mar 2013
First published
07 Mar 2013

Anal. Methods, 2013,5, 2188-2192

Highly sensitive and selective colorimetric detection of iodide based on anti-aggregation of gold nanoparticles

G. Zhou, C. Zhao, C. Pan and F. Li, Anal. Methods, 2013, 5, 2188 DOI: 10.1039/C3AY26593E

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