Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 367, Issue 1-3, Pages 167-173Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2010.07.006
Keywords
Gold nanoparticles; Amino acids; Photochemical synthesis; Colorimetric detection
Categories
Funding
- Japan Society for the Promotion of Science (JSPS) [22350040, 18004]
- Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
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In the present study, we carried out the photochemical synthesis of glycine-stabilized gold nanoparticles (Au NPs) at room temperature by using a photochemical initiator (Irgacure-2959). By adjusting the pH of the aqueous solution to 9 at the synthesis, we obtained a stable dispersion of anionic-glycine-stabilized Au NPs with sizes of about 5 nm; on the other hand, we obtained large and unstable neutral-glycine-capped Au NPs and cationic-glycine-capped Au NPs at pH 6 and 3, respectively. Anionic glycine has the highest affinity to Au NPs since the unprotonated amine and carboxylic groups of glycine interact with the gold surface. Heavy-metal-induced aggregation behavior of the glycine-stabilized Au NPs was also examined through the colorimetric detection of heavy metals (Ca2+, Cd2+, Co2+, Hg2+, Mg2+, Ni2+, Pb2+, and Zn2+). These sensitivities were nearly consistent with the complex formation constants (beta(1)) of glycine with these metal ions, but there was no difference between the detection limits of Hg2+ and Pb2+, irrespective of much higher beta(1) value of Hg2+ than that of Pb2+. It was suggested that this difference could be attributed to the difference in the binding behaviors of Hg2+ and Pb2+ with the glycine-capped Au NPs. (C) 2010 Elsevier B.V. All rights reserved.
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