Gold Nanoclusters Templated by Poly-cytosine DNA as Fluorescent Probes for Selective and Sensitive Detection of Thiocyanate

doi:10.1007/s40242-019-8361-9

Chemical Research in Chinese Universities ›› 2019, Vol. 35 ›› Issue (5): 788-791.doi: 10.1007/s40242-019-8361-9

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Gold Nanoclusters Templated by Poly-cytosine DNA as Fluorescent Probes for Selective and Sensitive Detection of Thiocyanate

MO Lixin^1,2, ZHAO Hengxin¹, MA Zheng¹, YU Wenxiao¹

1. Huihua College, Hebei Normal University, Shijiazhuang 050091, P. R. China;
2. Center for Evaluation and Facuity Developnent, Hebei University of Economics and Business, Shijiazhuang 050061, P. R. China

Received:2018-11-21 Online:2019-10-01 Published:2019-09-24
Contact: ZHAO Hengxin E-mail:zhaohengxin2008@126.com
Supported by:
Supported by the Natural Science Foundation of Hebei Province, China(No.B2015205172) and the Natural Science Researching Programs in Higher Education Institutions of Hebei Province, China(No.22017006).

Abstract

Abstract: Gold nanoclusters(AuNCs) were prepared in the presence of the nucleobases of poly-cytosine DNAs in this paper. We have demonstrated that the fluorescence of the AuNCs is quenched by thiocyanate(SCN^-) through the interaction between SCN^- and gold atoms. AuNCs can receive energy from nucleobases to boost their emission intensity, while in the presence of SCN^-, they coordinate with Au atoms and influence the energy transfer between the nucleobases and AuNCs, leading to the fluorescence quenching. The decreased fluorescence intensity was in proportion to the concentration of SCN^- in the range of 8.0×10^-7-1.5×10^-5 mol/L with a limit of detection of 4.2×10^-7 mol/L(3σ). We further validated the practice of this probe through the detection of SCN^- in natural water samples.

Key words: Fluorescence, Thiocyanate, Gold nanocluster

MO Lixin, ZHAO Hengxin, MA Zheng, YU Wenxiao. Gold Nanoclusters Templated by Poly-cytosine DNA as Fluorescent Probes for Selective and Sensitive Detection of Thiocyanate[J]. Chemical Research in Chinese Universities, 2019, 35(5): 788-791.

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Gold Nanoclusters Templated by Poly-cytosine DNA as Fluorescent Probes for Selective and Sensitive Detection of Thiocyanate

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