An ultrathin composite membrane has been developed as the outer covering barrierin a model amperometric lactate oxidase enzyme electrode. The membrane wasformed by cathodic electropolymerization of divinylbenzene/ethylvinylbenzene atthe surface of a gold coated polyester support membrane. Permeabilitycoefficients were determined for O2 and lactate across membranes with a range ofpolymer thicknesses. Anionic interferents (such as ascorbate) were screened fromthe working electrode by the composite membrane. The composite enzyme electrodeshowed an increased working concentration range and extended linearity ofresponses in comparison to an uncoated enzyme electrode.
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