FAD: Techniques

Contact Info

Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Email: schalk@unf.edu
Website: @unf

Electrode

Classification: Electrode -> membrane -> poly-(4-vinylpyridine)

Citations 1

'Bioamperometric Sensors For Phenol Based On Carbon Paste Electrodes', J. Electroanal. Chem., 1989 266(1) 47-55

"Bioamperometric Sensors For Phenol Based On Carbon Paste Electrodes"
J. Electroanal. Chem. 1989 Volume 266, Issue 1 Pages 47-55

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M. Bonakdar, J. L. Vilchez and Horacio A. Mottola

Abstract: The sensors were prepared by incorporating K4Fe(CN)6 and poly-(4-vinylpyridine) in carbon - mineral oil paste and adding (i) the commercial enzyme monophenol monooxygenase or (ii) fresh Agaricus bisporus albida mushroom before packing the mixture into the cavity of a thin-layer cell (Bioanalytical Systems). Alternatively, the carbon paste and the fresh mushroom were separately packed into a dual-electrode thin-layer cell mounted in serial mode. Measurements were made in a continuous-flow system at -0.2 V vs.. Ag - AgCl; 0.1 M KCl (pH 7.5) was used as supporting electrolyte. Response to phenol was rectilinear up to 2.5 ppm with a slope of 7.8 nA ppm-1 for the electrode incorporating the commercial enzyme, with a detection limit of 14 ppb; that incorporating mushroom admixed with the mediator had a dynamic range above 15 ppm and the detection limit was 0.16 ppm. The dual electrode also responded rectilinearly. The electrodes are easier to construct and condition than those incorporating tyrosinase adsorbed on nylon membranes.

Phenol Enzyme Detection limit Membrane Nylon