期刊
BIOSENSORS & BIOELECTRONICS
卷 25, 期 4, 页码 739-744出版社
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2009.08.017
关键词
Gold nanoparticles; Redox protein; Multilayer; Electrode; Layer-by-layer technique
类别
资金
- MWFK Brandenburg, Germany [3508-14/13]
In this study we have tested the use of modified gold nanoparticles (GNPs) for introduction into cytochrome c (CytC) multilayer assemblies, constructed by the layer-by-layer deposition technique. For this purpose gold nanoparticles of different size are synthesized and the GNPs modified with mercaptopropionic acid (MPA). The particles are characterized by UV-vis-spectroscopy and transmission electron microscopy (TEM). The modified particles have been studied with respect to their binding capability on a CytC layer by SPR. The negatively charged particles exhibit rather fast adsorption kinetics on CytC. We can also show that CytC binds to MPA-modified gold nanoparticles. For the construction of electro-active CytC multilayers a negatively charged polyelectrolyte can be used. We demonstrated that the polyelectrolyte can be replaced by small-sized GNPs (5 nm) in the multilayer assemblies, but assemblies consisting only of GNPs and CytC can be formed too. When these arrangements are prepared on gold electrodes, full electro-activity of the redox protein in the multiple layers can be obtained. CytC exhibits a formal potential of -24+/-12 mV vs. Ag/AgCl. The electrochemical response is linearly increasing with the number of layers deposited, reaching a CytC surface concentration of 100 pmol/cm(2) with 6 layers. The electron transfer mechanism through the layer system and the particle size influence are discussed. (C) 2009 Elsevier B.V. All rights reserved.
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