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Potentiometric tungsten electrodes with enzymes immobilised by the sol-gel technique

Przybyt M.

Materials Science

2003

Vol. 21, No. 4

417-429

The application of sol-gel transitions in development of potentiometric enzyme electrodes with urease, glucose oxidase and tyrosinase is described. Urease and glucose oxidase electrodes showed features of typical potentiometric electrodes with the response modified by the change of pH. The slopes of calibration curves in semilogarithmic coordinates were lower than the Nernstian values and the dynamic ranges were narrow for both electrodes. The tyrosinase electrode shows response to mono- and o-diphenols. The response of this electrode is not connected with the pH changes. The mechanism of the response of the tyrosinase electrode is discussed; it is proposed that the potential changes reflect the redox state of the enzyme. The electrode responds to reactant concentration (phenol, catechol and some others) even at concentrations 210-6 M. Such a high sensitivity makes the electrode a promising candidate for application in detecting traces of phenols.