Highly effective and sensitive sensor based on thin ordered protein layers

Joanna Cabaj ,  Jadwiga Sołoducho ,  Karolina Zynek ,  Jolanta Bryjak ,  Antoni Chyla 

Wrocław University of Technology, Department of Chemistry, Wybrzeże Wyspiańskiego 27, Wrocław 50-370, Poland

Physical entrapment within conducting material matrix is the widely used procedure of enzyme immobilization for sensor application due to its simplicity, uniform distribution of biomolecules within the film and applicability to a various proteins. To optimize the enzyme deposition and the layer stability several methods are developed including use of amphiphilic monomers or employing affinity interactions between biomolecules and polymers substituted with appropriate bio-compatible groups [1].

Several methods for protein architecture are reported i.e.: layer-by-layer technique, electrodeposition and Langmuir-Blodgett (LB) technique.

LB technology is known as a useful method for the formation of well-oriented film of bio/organic material on a solid substrate, because it can control the degree of order and packing density of protein and especially minimize the loss of protein activity [2]. The structures and moieties of this type of layers with embedded immobilized enzymes are of great interest because of their biosensor applications.

Another common method for immobilization enzymes is electropolymerization and electrodeposition. Electropolymerization methods have been extensively used to create immobilized enzyme electrodes with conducting polymers. The polymer forms a self-assembled monolayer by electrostatically adsorbing to a charged surface.

Continuing systematic investigation in fabrication of protein – conducting material sensitive layers [3], we reported here the results of research directed into the properties of laccase from Cerrena unicolor and tyrosinase from Agaricus bisporus integrated to thin films (LB films, electropolymer layers, Scheme). The immobilized phenoloxidases proved to be an excellent as a bioanalytical tool for monitoring phenolic pollutants. Furthermore, the sensor sensitization can be achieved by interlacing to ordered film conducting amphiphile according successful previous experience (ie carbazole and diphenylamine derivatives) [4]. Conducting polymer - poly[(N-nonylphenoxazine-3,7-diyl-alt-(1,2,3-benzothiadiazole)] admixed into the film is supposed to be a good mediator element in phenol oxidases sensor. The interlaced polymer is expected to facilitate the electron transfer as well enhancing the sensor sensitivity.

                                         Scheme. Immobilization methods of phenoloxidases

[1] B.D. Malhotra, A. Chaubey, S.P. Singh, Anal. Chim. Acta, 2006, 578, 59.

[2] H. G. Choi, B. K. Oh, W. H. Lee, J. W. Choi, Biotechnol. Bioprocess Eng., 2001, 6, 183.

[3] J. Cabaj, J. Soloducho, A. Chyla, J. Bryjak, K. Zynek, Sens. Actuators B, 2009, 136, 425.

[4] J. Cabaj, K. Idzik, J. Sołoducho, A. Chyla, J. Bryjak, J. Doskocz, Thin Solid Films, 2008, 516, 1171.

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Presentation: Poster at SMCBS'2009 International Workshop, by Joanna Cabaj
See On-line Journal of SMCBS'2009 International Workshop

Submitted: 2009-07-30 13:06
Revised:   2009-10-30 12:08