One pot synthesis of monodispersed L-glutathione stabilized gold nanoparticles for the detection of Pb2+ ions |
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Authors: | Xiang MAO Zheng-Ping LI Zhi-Yong TANG |
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Affiliation: | 1. Key Laboratory of Medicine Chemistry and Molecular Diagnosis (Ministry of Education), College of Chemistry and Environmental Science, Hebei University, Baoding 071002, China; 2. National Center for Nanoscience and Technology, Beijing 100190, China |
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Abstract: | Direct mixture of Au3+ with glutathione (GSH), which act as both reduction agents and stabilizers, in aqueous solution gave rise to production of gold nanoparticles (Au NPs) with uniform sizes of around 21 nm. The GSH stabilizer Au NPs in solution show immediate aggregation after addition of 1 mol/L NaCl aqueous solution containing Pb2+ ions. The Pb2+-induced aggregation in Au NP solution is monitored by both colorimetric response and UV-vis spectroscopy. A rather broad linear range (from 0.1 to 30 μmol/L) and low detection limit (0.1 μmol/L) are explored for Au NP sensors used for detection of Pb2+ ions. Furthermore, the response of GSH-stabilized Au NPs toward Pb2+ ions is specific compared with other possible interferants (Hg2+, Mg2+, Zn2+, Ni2+, Cu2+, Co2+, Ca2+, Mn2+, Cd2+, and Ba2+). |
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Keywords: | lead(II) ion glutathione (GSH) gold nanoparticle (Au NP) detection colorimetric response |
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