DETECTION OF HYDROGEN-PEROXIDE AND OTHER MOLECULES OF BIOLOGICAL IMPORTANCE AT AN ELECTROCATALYTIC SURFACE ON A CARBON-FIBER MICROELECTRODE

The electrocatalytic oxidation of hydrogen peroxide in solution at a m odified carbon fiber electrode has been investigated. A simple electro chemical procedure has been developed to dramatically improve the volt ammetry for the oxidation of peroxide, NADH, and several other species under steady state and fast scan voltammetry. The surface is generate d by the electrochemical oxidation of NADH followed by exposure to per oxide. This procedure yields a surface which is sensitive to peroxide and stable in air for more than 90 days. This oxidation occurs at a po tential such that it is easily discriminated from the analytes tested in this study.