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Using L‐Arginine‐Functionalized Gold Nanorods for Visible Detection of Mercury(II) Ions
Author(s) -
Guan Jiehao,
Wang YiCheng,
Gunasekaran Sundaram
Publication year - 2015
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/1750-3841.12811
Subject(s) - nanorod , chemistry , surface plasmon resonance , aqueous solution , detection limit , biosensor , ion , mercury (programming language) , metal ions in aqueous solution , analytical chemistry (journal) , nuclear chemistry , colloidal gold , nanoparticle , plasmon , photochemistry , inorganic chemistry , materials science , nanotechnology , chromatography , optoelectronics , organic chemistry , biochemistry , computer science , programming language
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 and environmental samples.