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The authors presented a simple colorimetric assay for the detection of toxic heavy metal lead(Ⅱ) ion(Pb2+).Pentapeptide,cysteine-alanine-leacine-asparagine-asparagine(CALNN),functionalized gold nanoparticles(GNPs) were aggregated in the presence of the divalent metal ion in solution by an ion-templated chelation process,which caused an easily measurable change in the absorption spectrum of the particles.Typically,mono-dispersing GNPs exhibit an absorption band at 522 nm,corresponding to a red color solution,while aggregated GNPs have it at longer wavelengths,corresponding to a purple or blue color solution.The chelation/aggregation process is reversible via the addition of a strong metal ion chelator such as EDTA.Highly selective and sensitive detection of Pb2+ in aqueous solution is thus provided.A detection limit of 0.1 μmol/L of Pb2+ was demonstrated.
The authors presented a simple colorimetric assay for the detection of toxic heavy metal lead (II) ion (Pb2 +). Pentapeptide, cysteine-alanine-leacine-asparagine-asparagine (CALNN), functionalized gold nanoparticles (GNPs) were aggregated in the presence of the divalent metal ion in solution by an ion-templated chelation process, which caused an easily measurable change in the absorption spectrum of the particles.Typically, mono-dispersing GNPs exhibit an absorption band at 522 nm, corresponding to a red color solution, while aggregated GNPs have it at longer wavelengths, corresponding to a purple or blue color solution. The chelation / aggregation process is reversible via the addition of a strong metal ion chelator such as EDTA. Highly selective and sensitive detection of Pb 2+ in aqueous solution is thus provided .A detection limit of 0.1 μmol / L of Pb2 + was demonstrated.