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  • Title: Label-free colorimetric detection of cadmium ions in rice samples using gold nanoparticles.
    Author: Guo Y, Zhang Y, Shao H, Wang Z, Wang X, Jiang X.
    Journal: Anal Chem; 2014 Sep 02; 86(17):8530-4. PubMed ID: 25117533.
    Abstract:
    A simple and label-free colorimetric method for cadmium ions (Cd(2+)) detection using unmodified gold nanoparticles (AuNPs) is reported. The unmodified AuNPs easily aggregate in a high concentration of NaCl solution, but the presence of glutathione (GSH) can prevent the salt-induced aggregation of AuNPs. When Cd(2+) is added to the stable mixture of AuNPs, GSH, and NaCl, Cd(2+) can coordinate with 4× GSH as a spherical shaped complex, which decreases the amount of free GSH on the surface of gold nanoparticles to weaken the stability of AuNPs, and AuNPs will easily aggregate in high-salt conditions. On the basis of the mechanism, we design a simple, label-free colorimetric method using AuNPs accompanied by GSH in a high-salt environment to detect Cd(2+) in water and digested rice samples.
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