Electrochemical biosensors based on redox enzymes are extensively used for providing quantitative information in food analysis and health care . Their simplicity, extreme selectivity and potential for analyte diversification (3) make them highly attractive for point-of-use sensing, as exemplified by the glucose biosensor (4-7), produced on a scale exceeding 10 10 units annually . The redox enzymes, used as biorecognition elements, catalyze the oxidation or reduction of specific analytes, generating an electrical current that serves as the sensing signal. Despite the high specificity of these enzymes, interferences in the electron transfer process often limit the accuracy of the analyte quantification.