Journal
MICROCHIMICA ACTA
Volume 184, Issue 12, Pages 4671-4677Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-017-2518-3
Keywords
Aptamer; Colorimetric probe; AuNP aggregation; Bare eye detection; UV-vis spectroscopy; Aggregation assay
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Funding
- Key Lab of Process Analysis and Control of Sichuan Universities [2016004]
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The authors describe a gold nanoparticle (AuNP) based aggregation assay for colorimetric determination of silver ions. The detection scheme is based on the release of aptamers from the surface of AuNPs that is triggered by the formation of C-Ag(I)-C links. In the absence of Ag(I) ions, the aptamers are readily adsorbed on the surface of the AuNPs. This prevents the aggregation of AuNPs and warrants the stability of the red colloidal solution at high salt concentration. In the presence of Ag(I) ions, the aptamers are released from the surface of AuNPs due to binding to Ag(I). Hence, salt-induced aggregation of AuNPs will occur which is accompanied by a gradual color change from red to blue. The color change occurs in the 1 to 500 nM Ag(I) concentration range, and the detection limit is 0.77 nM. The method was successfully applied to the determination of Ag(I) in spiked tap water samples.
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