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Bioelectrocatalysis by Microperoxidase-11 in a Multilayer Architecture of Chitosan Embedded Gold Nanoparticles

  • We report on the redox behaviour of the microperoxidase-11 (MP-11) which has been electrostatically immobilized in a matrix of chitosan-embedded gold nanoparticles on the surface of a glassy carbon electrode. MP-11 contains a covalently bound heme c as the redox active group that exchanges electrons with the electrode via the gold nanoparticles. Electroactive surface concentration of MP-11 at high scan rate is between 350+/-50 pmol cm(-2), which reflects a multilayer process. The formal potential (E degrees') of MP-11 in the gold nanoparticles-chitosan film was estimated to be -(267.7+/-2.9) mV at pH 7.0. The heterogeneous electron transfer rate constant (k(s)) starts at 1.21 s(-1) and levels off at 6.45 s(-1) in the scan rate range from 0.1 to 2.0 V s(-1). Oxidation and reduction of MP-11 by hydrogen peroxide and superoxide, respectively have been coupled to the direct electron transfer of MP-11.

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Author:Aysu Yarman, Thomas Nagel, Nenad Gajovic-Eichelmann, Anna Fischer, Ursula WollenbergerORCiDGND, Frieder W. SchellerORCiDGND
ISSN:1040-0397 (print)
Parent Title (English):Electroanalysis : an international journal devoted to fundamental and practical aspects of electroanalysis
Place of publication:Malden
Document Type:Article
Year of first Publication:2011
Year of Completion:2011
Release Date:2017/03/26
Tag:Bioelectrocatalysis; Direct electron transfer; Hydrogen peroxide; Microperoxidase; Nanoparticles; Superoxide
First Page:611
Last Page:618
Funder:BMBF of Germany [0311993]; Deutsche Forschunsgeminschaft (DFG) within the framework of the German Excellence Initiative [EXC 314]
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Chemie
Peer Review:Referiert