A Highly Sensitive and Selective Colorimetric Hg2+ Ion Probe Using Gold Nanoparticles Functionalized with Polyethyleneimine
- A Highly Sensitive and Selective Colorimetric Hg2+ Ion Probe Using Gold Nanoparticles Functionalized with Polyethyleneimine
- 이강봉; 이연희; 남윤식; 김경민
- Issue Date
- Journal of Analytical Methods in Chemistry
- VOL 2018, NO 1206913-12
- A highly sensitive and selective colorimetric assay for the detection of Hg2+ ions was developed using gold nanoparticles (AuNPs) conjugated with polyethyleneimine (PEI). ,e Hg2+ ion coordinates with PEI, decreasing the interparticle distance and inducing aggregation. Time-of-9ight secondary ion mass spectrometry showed that the Hg2+ ion was bound to the nitrogen atoms of the PEI in a bidentate manner (N– Hg2+– N), which resulted in a signi; cant color change from light red to violet due to aggregation. Using this PEI-AuNP probe, determination of Hg2+ ion can be achieved by the naked eye and spectrophotometric methods. Pronounced color change of the PEI-AuNPs in the presence of Hg2+ was optimized at pH 7.0, 50°C, and 300mM·NaCl concentration. ,e absorption intensity ratio (A700/A514) was correlated with the Hg2+ concentration in the linear range of 0.003– 5.0 μM. ,e limits of detection were measured to be 1.72, 1.80, 2.00, and 1.95nM for tap water, pond water, tuna; sh, and bovine serum, respectively. Owing to its facile and sensitive nature, this assay method for Hg2+ ions can be applied to the analysis of water and biological samples.
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