Analytical and Bioanalytical Chemistry

, Volume 405, Issue 20, pp 6437–6444 | Cite as

Modulation of direct electron transfer of cytochrome c by use of a molecularly imprinted thin film

  • Maria Bosserdt
  • Nenad Gajovic-Eichelman
  • Frieder W. Scheller
Research Paper

Abstract

We describe the preparation of a molecularly imprinted polymer film (MIP) on top of a self-assembled monolayer (SAM) of mercaptoundecanoic acid (MUA) on gold, where the template cytochrome c (cyt c) participates in direct electron transfer (DET) with the underlying electrode. To enable DET, a non-conductive polymer film is electrodeposited from an aqueous solution of scopoletin and cyt c on to the surface of a gold electrode previously modified with MUA. The electroactive surface concentration of cyt c was 0.5 pmol cm−2. In the absence of the MUA layer, no cyt c DET was observed and the pseudo-peroxidatic activity of the scopoletin-entrapped protein, assessed via oxidation of Ampliflu red in the presence of hydrogen peroxide, was only 30 % of that for the MIP on MUA. This result indicates that electrostatic adsorption of cyt c by the MUA–SAM substantially increases the surface concentration of cyt c during the electrodeposition step, and is a prerequisite for the productive orientation required for DET. After template removal by treatment with sulfuric acid, rebinding of cyt c to the MUA–MIP-modified electrode occurred with an affinity constant of 100,000 mol−1 L, a value three times higher than that determined by use of fluorescence titration for the interaction between scopoletin and cyt c in solution. The DET of cyt c in the presence of myoglobin, lysozyme, and bovine serum albumin (BSA) reveals that the MIP layer suppresses the effect of competing proteins.

Keywords

Cytochrome c Molecularly imprinted polymer film Mercaptoundecanoic acid Direct electron transfer Scopoletin (7-hydroxy-6-methoxycoumarin) 

Notes

Acknowledgements

The authors gratefully acknowledge financial support from BMBF (0311993) of Germany. This work is a part of UniCat, the Cluster of Excellence in the field of catalysis coordinated by TU Berlin and financially supported by Deutsche Forschungsgemeinschaft (DFG) within the framework of the German Excellence Initiative (EXC 314).

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Maria Bosserdt
    • 1
  • Nenad Gajovic-Eichelman
    • 2
  • Frieder W. Scheller
    • 1
  1. 1.Institute of Biochemistry and BiologyUniversity of PotsdamGolmGermany
  2. 2.Fraunhofer Institute for Biomedical Engineering IBMTPotsdamGermany

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