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• W2010668506 startingPage "240" @default.
• W2010668506 abstract "A precise determination of the complex mechanism of catalysis and inhibition involved in the reaction of HRP with H2O2 as substrate and an outersphere single electron donor ([Os(bpy)2pyCl]+) as cosubstrate is made possible by a systematic analysis of the cyclic voltammetric responses as a function of the scan rate and of the substrate and cosubstrate concentrations, complemented by spectrophotometric steady-state and stopped-flow experiments. The bell-shaped calibration curve relating the electrochemical response to the concentration of H2O2 is qualitatively and quantitatively explained by taking into account the conversion of the catalytically active forms of the enzyme into the inactive oxyperoxidase in addition to the primary catalytic cycle. These characteristics should be kept in mind in biosensor applications of HRP. The ensuing analysis and data allow one to predict biosensor amperometric responses in all practical cases. From a mechanistic standpoint, conditions may, however, be defined which render inhibition insignificant, thus allowing an electrochemical characterization of the primary catalytic cycle. At very low concentrations of H2O2, its diffusion tends to control the electrochemical response, resulting in proportionality with H2O2 concentration instead of the square root dependence characteristic of the classical catalytic currents. Intriguing hysteresis and trace crossings behaviors are also quantitatively explained in the framework of the same mechanism. As a consequence of the precise dissection of the rather complex reaction mechanism into its various elementary steps, a strategy may be devised for gaining a better understanding of the mechanism and reactivity patterns of each elementary step." @default.
• W2010668506 created "2016-06-24" @default.
• W2010668506 creator A5035957956 @default.
• W2010668506 creator A5055507421 @default.
• W2010668506 creator A5058646285 @default.
• W2010668506 creator A5071489095 @default.
• W2010668506 date "2001-12-14" @default.
• W2010668506 modified "2023-10-16" @default.
• W2010668506 title "Mediated Electrochemistry of Horseradish Peroxidase. Catalysis and Inhibition" @default.
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