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.