Using L-arginine-functionalized gold nanorods for visible detection of mercury(II) ions

Journal of Food Science
Jiehao GuanSundaram Gunasekaran

Abstract

A rapid and simple approach for visible determination of mercury ions (Hg(2+) ) in aqueous solutions was developed based on surface plasmon resonance phenomenon using L-arginine-functionalized gold nanorods (AuNRs). At pH greater than 9, the deprotonated amine group of L-arginine on the AuNRs bound with Hg(2+) leading to the side-by-side assembly of AuNRs, which was verified by transmission electron microscopy images. Thus, when Hg(2+) was present in the test solution, a blue shift of the typical longitudinal plasmon band of the AuNRs was observed in the ultra violet-visible-near infrared (UV-Vis-NIR) spectra, along with a change in the color of the solution, which occurred within 5 min. After carefully optimizing the potential factors affecting the performance, the L-arginine/AuNRs sensing system was found to be highly sensitive to Hg(2+) , with the limit of detection of 5 nM (S/N = 3); it is also very selective and free of interference from 10 other metal ions (Ba(2+) , Ca(2+) , Cd(2+) , Co(2+) , Cs(+) , Cu(2+) , K(+) , Li(+) , Ni(2+) , Pb(2+) ). The result suggests that the L-arginine-functionalized AuNRs can potentially serve as a rapid, sensitive, and easy-to-use colorimetric biosensor useful for determining Hg(2+) in food...Continue Reading

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Citations

Jun 12, 2016·Materials Science & Engineering. C, Materials for Biological Applications·A RajeshwariAmitava Mukherjee
Jan 20, 2018·International Journal of Analytical Chemistry·Lakshmi Narayana Suvarapu, Sung-Ok Baek
Feb 15, 2020·Journal of Hazardous Materials·Shuyu LiuFang Ma
Oct 4, 2021·Comprehensive Reviews in Food Science and Food Safety·Weizheng WangSundaram Gunasekaran

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