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Electron transfer in SAM/Cytochrome/Polyelectrolyte hybrid systems on electrodes: A time-resolved surface-enhanced resonance Raman study
Citation key ISI:000250228100067
Author Grochol, Jana and Dronov, Roman and Lisdat, Fred and Hildebrandt, Peter and Murgida, Daniel H.
Pages 11289-11294
Year 2007
ISSN 0743-7463
DOI 10.1021/1a701470d
Address 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Journal Langmuir
Volume 23
Number 22
Month OCT 23
Publisher AMER CHEMICAL SOC
Abstract Silver electrodes were covered with mixed self-assembled monolayers (SAMs) of 11-mercaptoundecanoic acid (MUA) and 11-mercaptoundecanol (MU) and subsequently coated with alternating layers of cytochrome c (Cyt) and poly(anilinesulfonic acid) (PASA). The immobilized protein is electroactive and retains its native structure. Compared to the case of systems on gold electrodes, the stability of the assembly was found to be decreased. The redox process of Cyt is accompanied by reversible oxidation-reduction of PASA as revealed by the comparative surface-enhanced resonance Raman (SERR) analysis of assemblies including Cyt and the redox-inactive apo-cytochrome c. Timeresolved SERR experiments show a fast electron exchange between the protein and the polyelectrolyte that may play a supporting role in the electric communication of thicker multilayer assemblies employed as sensors.
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