Citation:
ZHU Zhijun, LIU Dianjun, WANG Zhenxin. A Simple Colorimetric Assay for Detection of Cadmium Ion Based on 6-Mercaptopurine/peptide Functionalized Gold Nanoparticles[J]. Chinese Journal of Applied Chemistry,
;2013, 30(6): 716-722.
doi:
10.3724/SP.J.1095.2013.20366
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A simple colorimetric assay for rapid and selective sensing toxic heavy metal ion,cadmium ion(Cd2+),has been developed using gold nanoparticles(AuNPs) decorated with 6-mercaptopurine(MP) and peptide CALNN. MP is employed as a chelating ligand through the N group at the end of MP,and CALNN is served not only as a stabilizer,but also as a factor of high selectivity. AuNPs solution exhibits a gradual color change from red to blue with increasing the concentration of Cd2+,which leads to an easily measurable change in absorption spectrum of AuNPs solution and naked eye detection. A simple assay with high selectivity and fast response(within 5 min) is presented,and the limit of detection(LOD) for Cd2+ was calculated to be 350 nmol/L.
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Keywords:
- gold nanoparticles,
- colorimetric assay,
- cadmium ion,
- mercaptopurine
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