Biosensors 2012, 2(1), 101-113; doi:10.3390/bios2010101
Article

Enzyme-Gelatin Electrochemical Biosensors: Scaling Down

Received: 1 February 2012; in revised form: 3 March 2012 / Accepted: 14 March 2012 / Published: 15 March 2012
(This article belongs to the Special Issue Electrochemical Based Biosensors)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: In this article we investigate the possibility of scaling down enzyme-gelatin modified electrodes by spin coating the enzyme-gelatin layer. Special attention is given to the electrochemical behavior of the selected enzymes inside the gelatin matrix. A glassy carbon electrode was used as a substrate to immobilize, in the first instance, horse heart cytochrome c (HHC) in a gelatin matrix. Both a drop dried and a spin coated layer was prepared. On scaling down, a transition from diffusion controlled reactions towards adsorption controlled reactions is observed. Compared to a drop dried electrode, a spin coated electrode showed a more stable electrochemical behavior. Next to HHC, we also incorporated catalase in a spin coated gelatin matrix immobilized on a glassy carbon electrode. By spincoating, highly uniform sub micrometer layers of biocompatible matrices can be constructed. A full electrochemical study and characterization of the modified surfaces has been carried out. It was clear that in the case of catalase, gluteraldehyde addition was needed to prevent leaking of the catalase from the gelatin matrix.
Keywords: gelatin; hydrogel; biosensor; spin coating; catalase; biocatalysis; hydrogen peroxide
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MDPI and ACS Style

De Wael, K.; De Belder, S.; Pilehvar, S.; Van Steenberge, G.; Herrebout, W.; Heering, H.A. Enzyme-Gelatin Electrochemical Biosensors: Scaling Down. Biosensors 2012, 2, 101-113.

AMA Style

De Wael K, De Belder S, Pilehvar S, Van Steenberge G, Herrebout W, Heering HA. Enzyme-Gelatin Electrochemical Biosensors: Scaling Down. Biosensors. 2012; 2(1):101-113.

Chicago/Turabian Style

De Wael, Karolien; De Belder, Stijn; Pilehvar, Sanaz; Van Steenberge, Geert; Herrebout, Wouter; Heering, Hendrik A. 2012. "Enzyme-Gelatin Electrochemical Biosensors: Scaling Down." Biosensors 2, no. 1: 101-113.

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