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  • Title: "Turn-on" chemiluminescence sensor for the highly selective and ultrasensitive detection of Hg2+ ions based on interstrand cooperative coordination and catalytic formation of gold nanoparticles.
    Author: Cai S, Lao K, Lau C, Lu J.
    Journal: Anal Chem; 2011 Dec 15; 83(24):9702-8. PubMed ID: 22049919.
    Abstract:
    Monitoring the levels of potentially toxic metal ions such as Hg(2+) in aquatic ecosystems is important because this ion can have severe effects on human health and the environment. Thus, a novel chemiluminescence (CL) sensor is developed for the highly selective and ultrasensitive detection of Hg(2+) ions in aqueous solution, based on thymine-Hg(2+)-thymine (T-Hg(2+)-T) coordination chemistry and subsequent formation of gold nanoparticles (Au NPs) in a HAuCl(4)/NH(2)OH reaction. The thus-formed Au NPs trigger the reaction between luminol and AgNO(3), producing CL emission. This novel CL technique has several advantages including high sensitivity (0.01 ppb) and selectivity over a spectrum of interfering metal ions. In view of these advantages, as well as the cost-effective, minimized working steps and portable features of the CL techniques, we expect that this CL sensor will be a promising candidate for the field detection of toxic Hg(2+) ions in environment, water, and food samples.
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