Patent ID: 7638033
Filing Date: 2009-12-29
Classification: G01N

Abstract:
1. Biosensor system for the electrochemical determination of an analyte concentration in a sample, the system comprising an analyte reactant and at least two electrodes, wherein the analyte reactant is at least partially hydrated by the sample to form a reaction layer in contact with the electrodes for measurement of an analyte detection current flowing between the electrodes in response to an analysis voltage applied thereto, the analyte detection current corresponding to the analyte concentration in the sample by virtue of a reaction sequence comprising an analyte-specific reaction taking place in the reaction layer and an electrode reaction including transfer of electrons through a surface of one of the electrodes; and electronic circuitry comprising a DC-voltage source for applying the analysis voltage to the electrodes and measurement and evaluation electronics for measuring a plurality of values along a curve of the analyte detection current versus time over a plurality of measurement times and for deriving the analyte concentration therefrom by means of an evaluation algorithm; wherein the analysis voltage is applied to the electrodes during the analyte-specific reaction, the analyte-specific reaction and the electrode reaction taking place generally simultaneously and resulting in an analyte detection current versus time curve which comprises a rising section in which the current increases versus time; and wherein the analyte detection current is measured at at least two points of time in the rising section and the values of the analyte detection current resulting from said at least two measurements are used in the evaluation algorithm for interferent error compensation.