REDOX REACTIONS IN THE PRESENCE OF AN ION-EXCHANGE HYDROGEL COMPOSITEFILM/

The formation of a composite ion-exchange/hydrogel membrane using a mi xture of Nafion and poly(vinyl alcohol), is described. ?he structure o f the composite is investigated by following the cyclic voltammetry of anionic redox couples present in bulk solution, and by following the diffusional characteristics of cationic redox couples entrapped within the films. Hydrophobic redox species exhibit greater fates of diffusi on within the composite films than within films of homogeneous Nafion. The alms show greater resistance to protein adsorption than cellulose acetate or poly(carbonate). Electrical communication between co-immob ilized enzyme (glucose oxidase) and hydrophobic mediator is demonstrat ed.