Selective colorimetric sensing of histidine in aqueous solutions using cysteine modified silver nanoparticles in the presence of Hg2+.
Cysteine modified Ag nanoparticles were prepared in aqueous solution, via one-pot protocol, which were characterized by transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) and ultraviolet-visible spectroscopy (UV-vis). The nanoparticles provided a simple and rapid strategy to detect histidine (His) visually with the help of Hg(2+) ions in solution. The colorimetric sensor allows a rapidly quantitative assay of histidine down to the concentration of 3 x 10(-5) M. The mechanism by which Hg(2+) ions can bind with both the cysteine modified Ag nanoparticles and His molecule through cooperative metal-ligand interactions is discussed.
Key Laboratory of Pesticide and Chemical Biology (CCNU), Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, People's Republic of China.
Haibing
H
Li
Yinghui
Y
Bian
D002623:Chemistry Techniques, Analytical / Q000379:methods*; D003545:Cysteine / Q000378:metabolism*; D006639:Histidine / Q000032:analysis*; D008628:Mercury / Q000378:metabolism*; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D012680:Sensitivity and Specificity; D012834:Silver / Q000378:metabolism*; D012996:Solutions / Q000737:chemistry
D012996:Solutions; D012834:Silver; D006639:Histidine; D008628:Mercury; D003545:Cysteine