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Gold nanoparticles functionalized with 2,6-dimercaptopurine for sensitive and selective colorimetric determination of cadmium(II) in food, biological and environmental samples

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Abstract

A simple, rapid and sensitive colorimetric method has been developed for the detection of Cd2+ using 2,6-dimercaptopurine-modified gold nanoparticles. In the presence of Cd2+, gold nanoparticles functionalized with 2,6-dimercaptopurine were aggregated via chelation between the metal ion and the ligand, accompanied by a color change from red to blue observed with the naked eye. Further, the solution of 2,6-dimercaptopurine-modified gold nanoparticles was monitored using a UV-Vis spectrometer. Under optimized conditions, good linearity varying from 0.75 to 3.0 μM was obtained with a correlation coefficient (R) of 0.996 along with a limit of detection of 32.7 nM. The recoveries were 88.0–112.0% in real samples, and the results agree well with those acquired by atomic absorption spectroscopy with a graphite furnace. The new approach was successfully applied to the determination of Cd2+ in milk, honey, lake water, serum, and urine samples.

Graphical abstract: Gold nanoparticles functionalized with 2,6-dimercaptopurine for sensitive and selective colorimetric determination of cadmium(ii) in food, biological and environmental samples

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Publication details

The article was received on 01 Aug 2017, accepted on 26 Aug 2017 and first published on 28 Aug 2017


Article type: Paper
DOI: 10.1039/C7AY01871A
Citation: Anal. Methods, 2017, Advance Article
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    Gold nanoparticles functionalized with 2,6-dimercaptopurine for sensitive and selective colorimetric determination of cadmium(II) in food, biological and environmental samples

    M. H. Hu, W. H. Huang, L. L. Suo, L. H. Zhou, L. F. Ma and H. F. Zhu, Anal. Methods, 2017, Advance Article , DOI: 10.1039/C7AY01871A

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