Methods and apparatus for determining analyte in a sample using a sensor having electrodes which are provided with an enzyme and a mediator
First Claim
1. A method of determining concentration of an analyte in a fluid sample deposited on a sensor device having a working electrode and a counter electrode provided on a substrate, in which the working and counter electrodes are both provided with an enzyme and a mediator for carrying out a mediated redox reaction, the method comprising:
- applying an oxidising potential at a first voltage between the working and counter electrodes during a first time period;
applying a reducing potential at a second voltage between the working and counter electrodes during a second time period;
wherein a duration of the first time period is greater than a duration of the second time period;
determining a reaction parameter, the reaction parameter being indicative of the concentration of reduced mediator at the counter electrode after commencement of the second time period; and
using the reaction parameter to determine the concentration of analyte.
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Accused Products
Abstract
The invention relates to a method of and apparatus for determining concentration of an analyte, such as glucose, in a fluid sample, such as body fluid or control solution, using a mediated redox reaction. In particular, the method relates to mitigation of the effects of haematocrit on the response of sensor device used in such a method or apparatus. The invention describes a method of determining concentration of an analyte in a fluid sample deposited on a sensor device having a working electrode and a counter electrode, in which the electrodes are provided with an enzyme and a mediator for carrying out a mediated redox reaction, the method comprising: applying a first oxidizing potential between the working and counter electrodes during a first time period; applying a second reducing potential between the working and counter electrodes during a second time period; determining a reaction parameter, the reaction parameter being indicative of the concentration of reduced mediator at the counter electrode after commencement of the second time period; using the reaction parameter to determine the concentration of analyte.
17 Citations
20 Claims
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1. A method of determining concentration of an analyte in a fluid sample deposited on a sensor device having a working electrode and a counter electrode provided on a substrate, in which the working and counter electrodes are both provided with an enzyme and a mediator for carrying out a mediated redox reaction, the method comprising:
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applying an oxidising potential at a first voltage between the working and counter electrodes during a first time period; applying a reducing potential at a second voltage between the working and counter electrodes during a second time period; wherein a duration of the first time period is greater than a duration of the second time period; determining a reaction parameter, the reaction parameter being indicative of the concentration of reduced mediator at the counter electrode after commencement of the second time period; and using the reaction parameter to determine the concentration of analyte. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. An apparatus for determining concentration of analyte in a fluid sample comprising:
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a sensor device having a substrate and having a working electrode and a counter electrode provided on the substrate, in which both the working and counter electrodes are provided with an enzyme and a mediator; and a metering device comprising a microprocessor configured to control application of an oxidizing potential at a first voltage between the working electrode and the counter electrode for a first time period, and a reducing potential at a second voltage between the working electrode and the counter electrode for a second time period, the first time period being of greater duration than the second time period; the metering device further comprising; a detector to determine a reaction parameter indicative of the concentration of reduced mediator at the counter electrode after commencement of the second time period. - View Dependent Claims (20)
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Specification