Method of reducing interferences in an electrochemical sensor using two different applied potentials
First Claim
Patent Images
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.
7 Assignments
0 Petitions
Accused Products
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.
38 Citations
8 Claims
-
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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
Specification