Fabrication of a Sulfite Biosensor by the Use of Conducting Polymer

Abstract

In this research, an enzyme modified electrode has been produced during the electropolymerization of aniline through incorporation of sulfite oxidase into a conducting polymer. Then the bioelectrochemical response of resulted sulfite biosensor was investigated at different experimental conditions. Study of the stability of the resulted sulfite biosensor revealed that formation of a passive film on the aluminum surface causes improved stability of the electroactive films formed on the electrode surface. The bioelectrochemical response of the enzyme-modified electrode as a sulfite biosensor was investigated at different experimental conditions. The optimum pH and temperature were 8.5 and 35°C, respectively. The apparent Michaelis-Menten constant and the activation energy of the enzyme catalyzed reaction were calculated.

Keywords

• sulfite biosensor
• aniline
• sulfite oxidase
• conducting polymer