Patent ID: 8007656

Claim:
An electrochemical sensor strip, comprising: a base; a first electrode on the base; a first reagent layer on the first electrode, the first reagent layer comprising an electroactive organic molecule and an oxidoreductase capable of facilitating a redox reaction of an analyte; a second electrode on the base; and a second reagent layer on the second electrode, the second reagent layer consisting essentially of a redox pair comprising a first soluble redox species and a second soluble redox species, the redox pair selected from the group consisting of an organotransition metal complex, a transition metal coordination complex, and mixtures thereof, where the first soluble redox species is capable of undergoing a redox reaction opposite that of the analyte, and where the molar ratio of the first soluble redox species to the second soluble redox species is greater than 1.2:1 prior to use of the sensor strip in an analysis.