L-Cysteine modified gold nanoparticles for tube-based fluorometric determination of mercury(II) ions
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A fluorescent probe is described for detection of mercury(II) ion by using L-cysteine-modified gold nanoparticles (Cys-AuNP). These were fabricated by a tube-based redox reaction where Cys acts as both the reducing reagent and capping ligand. The Cys-AuNP display red fluorescence, with excitation/emission peaks at 373/625 nm. Owing to the high-affinity of the Hg(II)–Au(I) interaction and the Hg(II)/carboxy or amino group interaction, the presence of Hg(II) cause selective quenching the fluorescence, while other metal ions do not give such an effect. Based on these findings, a method was designed for the determination of Hg(II) that has attractive figures of merit. These include a low limit of detection (1.3 nM), a wide detection range (from 2 nM to 30µM), and excellent specificity. The method was applied to Hg(II) screening in (spiked) tap and river water, and it gave satisfactory results.
KeywordsNanotechnology Luminescent materials Nanomaterial synthesis One-step detection Mercury(II) detection Fluorescence signaling Signal-off Red fluorescence Fluorescence quenching Heavy metal ion
This work was supported by the National Natural Science Foundation of China (Grant No. 21804022 and 21804028), the Anhui Provincial Natural Science Foundation (Grant NO. 1908085QC121), the Fundamental Research Funds for the Central Universities of China (Grant NO. JZ2019HGTB0068), the Science and Technology Project of the Education Department of Jiangxi Province of China (Grant No. GJJ170846), and the Special Graduate Student Innovation Fund of Jiangxi Province (Grant No. YCX18B005). Special thanks to the Open Project of State Key Laboratory of Chemo/Biosensing and Chemometrics (Grant No. 201806) at Hunan University.
Compliance with ethical standards
The author(s) declare that they have no competing interests.
- 7.Habte G, Hwang IM, Kim JS, Hong JH, Hong YS, Choi JY, Nho EY, Jamila N, Khan N, Kim KS (2016) Elemental profiling and geographical differentiation of Ethiopian coffee samples through inductively coupled plasma-optical emission spectroscopy (ICP-OES), ICP-mass spectrometry (ICP-MS) and direct mercury analyzer (DMA). Food Chem 212:512–520CrossRefGoogle Scholar
- 22.Huang C-C, Chang H-T (2007) Parameters for selective colorimetric sensing of mercury(ii) in aqueous solutions using mercaptopropionic acid-modified gold nanoparticles. Chem Commun(12):1215-1217Google Scholar
- 24.World Health Organization. Water, Sanitation and Health Team (2004). Guidelines for drinking-water quality. Vol. 1, Recommendations, 3rd ed. World Health OrganizationGoogle Scholar