L-Cysteine modified gold nanoparticles for tube-based fluorometric determination of mercury(II) ions

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/em...

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Bibliographic Details
Published in:Mikrochimica acta (1966) 2019-09, Vol.186 (9), p.632-632, Article 632
Main Authors: Ma, Xiaoming, Wang, Zhen, He, Shan, Zhao, Jingyi, Lai, Xiaoqi, Xu, Jianguo
Format: Article
Language:English
Subjects:
Analytical Chemistry
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Cysteine
Cysteine - chemistry
Cystine
Fluorescence
Fluorescent Dyes - analysis
Fluorescent Dyes - chemistry
Fluorometry
Gold - chemistry
Ions - analysis
Mercury - analysis
Metal Nanoparticles - chemistry
Microengineering
Nanochemistry
Nanoparticles
Nanotechnology
Original Paper
Particle Size
Spectrophotometry, Ultraviolet
Surface Properties
Thiols
Water Pollutants, Chemical - analysis
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Summary: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. Graphical abstract Schematic representation of the application of L-cysteine modified gold nanoparticles (Cys-AuNP) for qualitative and quantitative detection of mercury(II) ions. Based on the interaction between Cys-AuNP and mercury(II) ion to quench the red fluorescence of Cys-AuNP, the target mercury(II) can in turn be determined by a fluorometric method.
ISSN:0026-3672
1436-5073
DOI:10.1007/s00604-019-3734-9