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Development of electrochemical biosensors based on sol-gel enzyme encapsulation...
Pauliukaite, Rasa; Schoenleber, Monika; Vadgama, Pankaj; Brett, ChristopherAbstract Protective polymer coatings have been used to enhance the retention of enzymes in sol-gel films as immobilisation phases in electrochemical biosensors. Carbon film electrodes were electrochemically modified with poly(neutral red) (PNR). These electrodes were coated with oxysilane sol-gels incorporating glucose oxidase and an outer coating of carboxylated PVC (CPVC) or polyurethane (PU), with and witho...
Voltammetric and impedance studies of inosine-5'-monophosphate and hypoxanthine
Oliveira-Brett, Ana Maria; Silva, Luís A.; Farace, Giosi; Vadgama, Pankaj; Brett, Christopher M. A.The oxidation mechanism and adsorption of inosine 5'-monophosphate and hypoxanthine were investigated in solutions of different pH using voltammetric and impedance methods at glassy carbon electrodes. For both compounds, the pH dependence from differential pulse voltammetry showed that the same number of electrons and protons are involved in the rate-determining step of the electrochemical reaction. In the case...
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