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Water-dispersible tryptophan-protected gold nanoparticles prepared by the spontaneous reduction of aqueous chloroaurate ions by the amino acid
被引:253
作者:
Selvakannan, P
[1
]
Mandal, S
[1
]
Phadtare, S
[1
]
Gole, A
[1
]
Pasricha, R
[1
]
Adyanthaya, SD
[1
]
Sastry, M
[1
]
机构:
[1] Natl Chem Lab, Mat Chem Div, Pune 411008, Maharashtra, India
关键词:
nanoparticles;
amino acids;
surface modification;
NMR;
electrostatic stabilization;
D O I:
10.1016/S0021-9797(03)00616-7
中图分类号:
O64 [物理化学(理论化学)、化学物理学];
学科分类号:
070304 ;
081704 ;
摘要:
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. (C) 2003 Elsevier Inc. All rights reserved.
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页码:97 / 102
页数:6
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