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  • Title: Cu(Ⅱ) triggering redox-regulated anti-aggregation of gold nanoparticles for ultrasensitive visual sensing of iodide.
    Author: Peng R, He H, Wang Q, Yan X, Yu Q, Qin H, Lei Y, Luo L, Feng Y.
    Journal: Anal Chim Acta; 2018 Dec 07; 1036():147-152. PubMed ID: 30253825.
    Abstract:
    In this study, we proposed a novel anti-aggregation of gold nanoparticles (AuNPs) strategy for colorimetric sensing of iodide ions (I-) regulated by the redox reaction between the target ions and the ion cross-linking agent. Cu2+ as interlinking ion can induce aggregation of arginine capped AuNPs (Arg-AuNPs) due to the formation of Arg-Cu2+-Arg analogous structure resulting from the chelation between Cu2+ and arginine, with a clear color change of solution from red to blue. In the presence of I-, however, Cu2+ would be readily reduced owing to the formation of CuI, AuNPs underwent a transformation from an aggregation to a dispersion state depending on the concentration of I-, leading color changes from blue to red. The corresponding color variation in the process of anti-aggregation of AuNPs can be monitored through UV-vis spectrophotometer or by the naked-eye, making quantitative analysis of I- feasible in a convenient colorimetric or visual way. The assay only took 5 min, showing high sensitivity with a lowest detectable concentration of 10 nM and excellent selectivity for I- over other anions tested, which was successfully applied for the detection of I- in drinking water and table salt samples.
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