interferant eliminating analyte sensors and sensing process prevent erroneous assays . glucose electrodes were coated with an oxidizing enzyme which allows hydrogen peroxide to selectively oxidize ascorbate , urate , bilirubin , and acetaminophenol in the presence of glucose . hydrogen peroxide may be added to the assayed solution or generated in situ . the oxidizing enzyme was prevented from causing undesired reduction currents at the glucose electrode by preventing contact of the oxidizing enzyme with the glucose electrode , or by increasing the applied voltage .