Patent ID: 7485212

Claim:
A system for the determination of an analyte in a liquid medium, comprising: a self-powered biosensor comprising a cathode and an anode; redox enzymes on a surface of the cathode and a surface of the anode; and a detector for measuring an electrical signal generated by the biosensor while the analyte is being oxidized or reduced, the analyte being capable of undergoing a biocatalytic oxidation or reduction in the presence of an oxidizer or reducer, respectively, wherein an enzyme carried on one of either the cathode or the anode is capable of catalyzing an oxidation or reduction reaction in which the analyte is oxidized or reduced, respectively, wherein another enzyme carried on another of either the cathode or the anode is capable of catalyzing a reaction in which the oxidizer or the reducer are reduced or oxidized, respectively, in the presence of the analyte, and wherein the biosensor is configured such that the liquid medium flows from a first end of the biosensor to a second end of the biosensor and between the cathode and the anode.