Water-dispersible tryptophan-protected gold nanoparticles prepared by the spontaneous reduction of aqueous chloroaurate ions by the amino acid

Selvakannan, P. R. ; Mandal, Saikat ; Phadtare, Sumant ; Gole, Anand ; Pasricha, Renu ; Adyanthaya, S. D. ; Sastry, Murali (2004) Water-dispersible tryptophan-protected gold nanoparticles prepared by the spontaneous reduction of aqueous chloroaurate ions by the amino acid Journal of Colloid and Interface Science, 269 (1). pp. 97-102. ISSN 0021-9797

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1016/S0021-9797(03)00616-7

Abstract

The synthesis of water-dispersible amino-acid-protected gold nanoparticles by the spontaneous reduction of aqueous chloroaurate ions by tryptophan is described. Water-dispersible gold nanoparticles may also be obtained by the sequential synthesis of the gold nanoparticles by borohydride reduction of chloroauric acid followed by capping with tryptophan. Comparison of the proton NMR spectroscopic signatures from the tryptophan-protected gold nanoparticles obtained by the two processes indicated that the indole group in tryptophan is responsible for reduction of the aqueous chloroaurate ions. The reduction of the metal ions is accompanied by oxidative polymerization of the indole group of the tryptophan molecules and, consequently, some degree of cross-linking of the gold nanoparticles.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Nanoparticles; Amino Acids; Surface Modification; NMR; Electrostatic Stabilization
ID Code:47129
Deposited On:06 Jul 2011 14:16
Last Modified:06 Jul 2011 14:16

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