AMPEROMETRIC ENZYME GAS-DIFFUSION ELECTRODES

An amperometric enzyme/gas-diffusion electrode is developed which comb ines a porous air-breathing gas-diffusion electrode with an enzyme imm obilized on its catalytic layer. The behaviour of glucose oxidase/gas- diffusion and lactate oxidase/gas-diffusion electrodes are investigate d when oxygen, needed for the enzymatic reaction, is supplied in the g as phase through the porous structure of the gas-diffusion electrode. This electrode can be used as a model system for the investigation of the influence of oxygen on the performance both of the peroxide or med iated enzyme electrodes in the effort to develop oxygen-independent bi osensors.