Electroanalysis And Electrocatalysis Using Poly(Vinylferrocenium) Perchlorate Coated Electrodes
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Electroanalytical applications based on the electrochemical behavior of the redox polymer, poly(vinylferrocenium) perchlorate (PVF+ClO4-) coated as a film on Pt surfaces, are described. This chemically modified surface is electroactive due to the existence of ferrocenium/ferrocene sites in its structure. Electrooxidation and electroreduction of other depolarizers can also take place through this polymeric film. Anions such as iodide, thiocyanate and cyanide are incorporated in the polymeric structure as a result of anion exchange. Anodic stripping of the anions from the film can be carried out after the initial preconcentration. Catalytic reduction and oxidation of anthracene occur on the PVF+ClO4- coated Pt surface in acetonitrile/TBAP medium. An enzyme such as glucose oxidase could be immobilized in the polymeric matrix and this surface could be used for the amperometric determination of glucose under aerobic conditions. Coimmobilization of two enzymes, glucose oxidase and invertase, in the same polymeric matrix allows for the development of an amperometric sucrose sensor.