METHOD OF REDUCING INTERFERENCES IN AN ELECTROCHEMICAL SENSOR USING TWO DIFFERENT APPLIED POTENTIALS
First Claim
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1. A method of reducing interferences in an electrochemical sensor comprising:
- applying a first potential to a first working electrode;
applying a second potential to a second working electrode, wherein said second potential is greater than the absolute value of said first potential;
measuring a first current, at said first working electrode, which comprises an analyte current and an interfering compound current;
measuring a second current, at said second working electrode, which comprises an analyte overpotential current and an interfering compound overpotential current, wherein said analyte overpotential current has a first directly proportional relationship to said analyte current and, wherein said interfering compound overpotential current has a second directly proportional relationship to said interfering compound current; and
calculating a corrected current value representative of an analyte concentration using an equation which is a function of said first current, said second current, said first directly proportional relationship, and said second directly proportional relationship.
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Abstract
The present invention is directed to a method of reducing the effects of interfering compounds in the measurement of analytes and more particularly to a method of reducing the effects of interfering compounds in a system wherein the test strip utilizes two or more working electrodes. In one embodiment of the present invention, a first potential is applied to a first working electrode and a second potential, having the same polarity but a greater magnitude than the first potential, is applied to a second working electrode.
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8 Claims
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1. A method of reducing interferences in an electrochemical sensor comprising:
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applying a first potential to a first working electrode; applying a second potential to a second working electrode, wherein said second potential is greater than the absolute value of said first potential; measuring a first current, at said first working electrode, which comprises an analyte current and an interfering compound current; measuring a second current, at said second working electrode, which comprises an analyte overpotential current and an interfering compound overpotential current, wherein said analyte overpotential current has a first directly proportional relationship to said analyte current and, wherein said interfering compound overpotential current has a second directly proportional relationship to said interfering compound current; and calculating a corrected current value representative of an analyte concentration using an equation which is a function of said first current, said second current, said first directly proportional relationship, and said second directly proportional relationship. - View Dependent Claims (2, 3, 4, 5, 6)
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7. (canceled)
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8. (canceled)
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