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A Redox Route for the Fluorescent Detection of Lead ions in and Desk Study of Paper-based Probe


In this paper, we developed a label-free fluorescent assay employing BSA-Au NCs, S2O32-, and 2-ME for the highly selective and sensitive detection of Pb2+ in sorghum, river water and tap water. When the BSA-Au NCs reacted with S2O32- in solution, Au(S2O3)23- complexes were formed immediately on the surfaces of BSA-Au NCs. After adding Pb2+ and 2-ME, the BSA-Au NCs rapidly dissolved to form Au-S complexes. As a result, the fluorescence intensity decreased dramatically, allowing quantifying the Pb2+ in the aqueous solution. This reaction is highly specific under optimal detection conditions. A good linear relationship between the fluorescence intensity and the concentrations of Pb2+ could be obtained in the range of 10 to 1000 nM (R2=0.9910), with a detection limit (LOD; S/N ratio= 3) down to 1.043 nM. Significantly, compared with other works, we greatly shorten the reaction time by substantial improvements in materials. In the basis of above-mentioned work, we successfully immobilized S2O32- modified BSA-Au NCs on wax-printed papers to achieve a purpose of simple and real-time field monitor of Pb2+. We picked up R- values (the red value of RGB color model) from captured fluorescence images under the UV light (365nm) and acquired a linear correlation between R-values and Pb2+ concentrations. This linear correlation exhibits the great potential of this approach. Proposed probe also showed satisfactory selectivity as well as excellent reproducibility. Multiple real sample experiments showed the tremendous prospect of this method, as well.

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Publication details

The article was received on 20 Apr 2018, accepted on 27 May 2018 and first published on 31 May 2018

Article type: Paper
DOI: 10.1039/C8AY00892B
Citation: Anal. Methods, 2018, Accepted Manuscript
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    A Redox Route for the Fluorescent Detection of Lead ions in and Desk Study of Paper-based Probe

    P. Li, J. Li, M. Bian, D. Huo, C. Hou, P. Yang, S. Zhang, C. Shen and M. Yang, Anal. Methods, 2018, Accepted Manuscript , DOI: 10.1039/C8AY00892B

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