Transient decay amperometry
First Claim
1. A method for determining an analyte concentration in a sample after forming a measurable species from a reaction between the analyte and an ionizing agent during an incubation period, comprising:
- applying a signal to a sample after an incubation period from 0.4 to 1 second, the signal including excitations, each excitation having a duration from 0.1 to 5 seconds;
generating a signal having a transient decay in response to a redox reaction of a measurable species, wherethe generated signal results from at least one of the excitations having the duration from 0.1 to 5 seconds, and wherethe measurable species concentration in the sample is responsive to the analyte concentration in the sample; and
determining the analyte concentration from the transient decay of the generated signal.
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Abstract
A biosensor system determines an analyte concentration of a biological sample using an electrochemical process without Cottrell decay. The biosensor system generates an output signal having a transient decay, where the output signal is not inversely proportional to the square root of the time. The transient decay is greater or less than the −0.5 decay constant of a Cottrell decay. The transient decay may result from a relatively short incubation period, relatively small sample reservoir volumes, relatively small distances between electrode surfaces and the lid of the sensor strip, and/or relatively short excitations in relation to the average initial thickness of the reagent layer. The biosensor system determines the analyte concentration from the output signal having a transient decay.
261 Citations
29 Claims
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1. A method for determining an analyte concentration in a sample after forming a measurable species from a reaction between the analyte and an ionizing agent during an incubation period, comprising:
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applying a signal to a sample after an incubation period from 0.4 to 1 second, the signal including excitations, each excitation having a duration from 0.1 to 5 seconds; generating a signal having a transient decay in response to a redox reaction of a measurable species, where the generated signal results from at least one of the excitations having the duration from 0.1 to 5 seconds, and where the measurable species concentration in the sample is responsive to the analyte concentration in the sample; and determining the analyte concentration from the transient decay of the generated signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22, 23, 24, 25)
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21. A method for determining an analyte concentration in a sample after forming a measurable species from a reaction between the analyte and an ionizing agent during an incubation period, comprising:
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applying a signal to a sample after an incubation period of at most 8 seconds, the signal including excitations and relaxations; generating a signal having a transient decay in response to a redox reaction of a measurable species, where the transient decay has a decay constant from −
0.001 to −
0.48 or from −
0.52 to −
1; anddetermining the analyte concentration from the transient decay of the generated signal. - View Dependent Claims (26, 27, 28, 29)
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Specification