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A colorimetric assay is described for highly selective and sensitive determination of Hg(II) ions by using gold nanoparticles (AuNPs) functionalized with dithioerythritol (DETL). This method relies on the unique optical properties of DETL-functionalized AuNPs as well as the thiophilicity of both AuNPs and Hg(II). In the presence of DETL, the AuNPs aggregate due to ligand exchange between thiol groups...
The authors describe a colorimetric assay for the quantitation of antibiotic kanamycin. It is based on hydrogen-bonding recognition capability of gold nanoparticles (AuNPs) in a chitosan matrix. Hydrogen-bonding interaction between kanamycin and chitosan induces the aggregation of the AuNPs, and this result in a color change of the AuNPs from wine red to blue. The ratio of the absorbance at 650 nm...
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