Oxidizable species as an internal reference in control solutions for biosensors
First Claim
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1. A method of distinguishing a control solution from a sample during operation of an electrochemical sensor, the electrochemical sensor measuring the amount of an analyte, the method comprising the acts of:
- providing an electrochemical sensor having a working electrode, a counter electrode, a reagent, and a control solution, the reagent having a mediator, the control solution having an internal reference compound, a buffer, and a predetermined amount of analyte, the internal reference compound having a higher redox potential than the mediator, the internal reference compound being different from the buffer;
applying a first potential to the electrochemical sensor sufficient to oxidize the internal reference compound and the mediator, and measuring the resulting electrical current;
applying a second, lower potential to the electrochemical sensor, the lower potential being sufficient to oxidize the mediator and insufficient to oxidize the internal reference compound, and measuring the resulting electrical current; and
determining whether a control solution or a sample is present based on the measured electrical currents.
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Abstract
Testing of the performance of an electrochemical meter used to measure the presence of an analyte in a biological sample, particularly glucose in whole blood, includes introducing a control solution containing a predetermined amount of the analyte and a predetermined amount of an internal reference compound. The internal reference compound is selected such that it is oxidized at a potential greater than that used to oxidize the analyte, thereby making it possible to distinguish the control solution from a biological sample.
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Citations
17 Claims
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1. A method of distinguishing a control solution from a sample during operation of an electrochemical sensor, the electrochemical sensor measuring the amount of an analyte, the method comprising the acts of:
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providing an electrochemical sensor having a working electrode, a counter electrode, a reagent, and a control solution, the reagent having a mediator, the control solution having an internal reference compound, a buffer, and a predetermined amount of analyte, the internal reference compound having a higher redox potential than the mediator, the internal reference compound being different from the buffer; applying a first potential to the electrochemical sensor sufficient to oxidize the internal reference compound and the mediator, and measuring the resulting electrical current; applying a second, lower potential to the electrochemical sensor, the lower potential being sufficient to oxidize the mediator and insufficient to oxidize the internal reference compound, and measuring the resulting electrical current; and determining whether a control solution or a sample is present based on the measured electrical currents. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of distinguishing a control solution from a sample during operation of an electrochemical sensor, the electrochemical sensor measuring the amount of an analyte, the method comprising the acts of:
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providing an electrochemical sensor having a working electrode, a counter electrode, a reagent, and a control solution, the reagent having a mediator, the control solution having a predetermined amount of an internal reference compound, a buffer, and a predetermined amount of analyte, the predetermined amount of the internal reference compound being dependent upon the predetermined amount of analyte; applying a first potential to the electrochemical sensor sufficient to oxidize the internal reference compound and the mediator, and measuring the resulting electrical current; applying a second potential to the electrochemical sensor, the second potential being at least 100 mV lower than the first potential, the second potential being sufficient to oxidize the mediator and insufficient to oxidize the internal reference compound, and measuring the resulting electrical current; and determining whether a control solution or a sample is present based on the measured electrical currents. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification