CA2521370A1 - Biosensor system - Google Patents

Biosensor system Download PDF

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Publication number
CA2521370A1
CA2521370A1 CA002521370A CA2521370A CA2521370A1 CA 2521370 A1 CA2521370 A1 CA 2521370A1 CA 002521370 A CA002521370 A CA 002521370A CA 2521370 A CA2521370 A CA 2521370A CA 2521370 A1 CA2521370 A1 CA 2521370A1
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CA
Canada
Prior art keywords
analyte
detection current
electrodes
current
analyte detection
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002521370A
Other languages
French (fr)
Other versions
CA2521370C (en
Inventor
Joachim Kasielke
Michael Marquant
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
F Hoffmann La Roche AG
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of CA2521370A1 publication Critical patent/CA2521370A1/en
Application granted granted Critical
Publication of CA2521370C publication Critical patent/CA2521370C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G01N27/28—Electrolytic cell components
    • G01N27/30—Electrodes, e.g. test electrodes; Half-cells
    • G01N27/327—Biochemical electrodes, e.g. electrical or mechanical details for in vitro measurements
    • G01N27/3271—Amperometric enzyme electrodes for analytes in body fluids, e.g. glucose in blood
    • G01N27/3273—Devices therefor, e.g. test element readers, circuitry
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
    • G01N33/543—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals
    • G01N33/54366—Apparatus specially adapted for solid-phase testing
    • G01N33/54373—Apparatus specially adapted for solid-phase testing involving physiochemical end-point determination, e.g. wave-guides, FETS, gratings
    • G01N33/5438—Electrodes

Abstract

Biosensor system and method for the electrochemical determination of an analyte in a sample. An analyte reactant is mixed with the sample to form a reaction liquid which is contacted to electrodes for measurement of an analy te detection current. The analyte detection current is characteristic of the analyte concentration in the sample by virtue of a reaction sequence comprising an analyte specific reaction taking place in the reaction liquid and an electrode reaction including transfer of electrons through an electro de surface. A plurality of values of a curve of the analyte detection current versus time is measured and the analyte concentration is derived therefrom b y means of an evaluation algorithm. Fast results of high accuracy are achieved in that the DC-voltage is applied to the electrodes during the analyte- specific reaction whereby the analyte-specific reaction and the electrode reaction take place simultaneously resulting in an analyte detection current versus time curve which comprises a section in which the current rises versu s time and the analyte detection current is measured at at least two points of time in the rising section and the values of the analyte detection current resulting from said at least two measurements are used in the evaluation algorithm for temperature error compensation.

Claims (13)

1. Biosensor system for the electrochemical determination of an analyte in a sample, the system comprising an analyte reactant and at least two electrodes, wherein the analyte reactant is mixed with the sample to form a reaction liquid and the reaction liquid is contacted to the electrodes for measurement of an analyte detection current flowing between the electrodes in response to a DC-voltage applied thereto, the analyte detection current being characteristic of the analyte concentration in the sample by virtue of a reaction sequence comprising an analyte specific reaction taking place in the reaction liquid and an electrode reaction including transfer of electrons through an electrode surface and electronic circuitry comprising a DC-voltage source for applying the required DC-voltage to the electrodes and a measurement and evaluation electronics for measuring a plurality of values of a curve of the analyte detection current versus time over a plurality of measurement times and for deriving the analyte concentration therefrom by means of an evaluation algorithm characterised in that the DC-voltage is applied to the electrodes during the analyte-specific reaction whereby the analyte-specific reaction and the electrode reaction take place simultaneously resulting in an analyte detection current versus time curve which comprises a section in which the current rises versus time and the analyte detection current is measured at at least two points of time in the rising section and the values of the analyte detection current resulting from said at least two measurements are used in the evaluation algorithm for temperature error compensation.
2. System according to claim 1, characterized in that it comprises disposable analysis elements (2) including the analyte reactant and the at least two electrodes (9,10) and an evaluation instrument (3) adapted for evaluation of the analysis elements (2) and having a holder (4) for receiving an analysis element (2) and electrical contacts establishing an electrical connection to an analysis element (2) inserted into the holder (4) thereby connecting the electrodes (9,10) of the analysis element (2) to the electronics circuitry.
3. Biosensor system according, to claim 2, characterized in that the analysis element is a capillary type element including a space of capillary dimensions comprising the electrodes (9,10) and the analyte reactant.
4. Method for the electrochemical determination of an analyte in a sample, comprising the steps of mixing an analyte with the sample to form a reaction liquid, contacting the reaction liquid to a pair of electrodes, measuring a plurality of values of a curve of an analyte detection current versus time over a plurality of measurement times, the analyte detection current flowing between the electrodes in response to a DC-voltage applied thereto and being characteristic of the analyte concentration in the sample by virtue of a reaction sequence comprising an analyte specific reaction taking place in the reaction liquid and an electrode reaction including transfer of electrons through an electrode surface and deriving the analyte concentration by means of an evaluation algorithm comprising use of said plurality of values of the analyte detection current, characterized in that the DC-voltage is applied to the electrodes during the analyte-specific reaction whereby the analyte-specific reaction and the electrode reaction take place simultaneously resulting in an analyte detection current versus time curve which comprises a section in which the current rises versus time and the analyte detection current is measured at at least two points of time in the rising section and the values of the analyte detection current resulting from said at least two measurements are used in the evaluation algorithm for temperature error compensation.
5. System according to claim 1 or method according to claim 4, characterized in that the analyte detection current is measured at at least three points of time in the rising section to generate information about the shape of the rising section and the at least three values of the analyte detection current resulting from said at least three measurements are used in the evaluation algorithm for the temperature error compensation.
6. System according to claim 1 or method according to claim 4, characterized in that an AC-voltage is applied to the electrodes and the resulting AC-current is measured for error compensation.
7. System or method according to claim 6, characterized in that a measurement of the AC-current is performed simultaneously with a measurements of the analyte detection current in the rising section.
8. System or method according to claim 7, characterized in that the sample is whole blood and the error compensation based on the AC measurement comprises a compensation for variations of the hematocrit value of the whole blood sample.
9. System according to claim 1 or method according to claim 4 characterized in that the evaluation algorithm by which the analyte concentration is derived from values of the analyte detection current comprises determination of a maximum of the analyte detection current versus time curve and use of a value of the detection current versus time curve which has been measured at a point of time corresponding to a predetermined ratio to the point of time at which the maximum occurs.
10. System according to claim 7, characterized in that the electronic circuitry comprises two independent current measurement circuits (25,32) for measuring the DC-current and the AC-current respectively.
11. System according to claim 10, characterized in that one of the current measurement circuits (25) is located in the connecting line leading to one of said at least two electrodes and the other current measurement circuit is located in the connecting line leading to the other of said at least two electrodes.
12. System according to claim 10, characterized in that the AC-current measurement circuit (25) comprises a shunt resistor coupled to a differential amplifier.
13. System according to claim 10, characterized in that the DC-current measurement circuit (32) comprises an operational amplifier based voltage to current converter.
CA2521370A 2003-04-08 2004-03-13 Biosensor system Expired - Fee Related CA2521370C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP03008143.4 2003-04-08
EP03008143A EP1467206A1 (en) 2003-04-08 2003-04-08 Biosensor system
PCT/EP2004/002646 WO2004090533A1 (en) 2003-04-08 2004-03-13 Biosensor system

Publications (2)

Publication Number Publication Date
CA2521370A1 true CA2521370A1 (en) 2004-10-21
CA2521370C CA2521370C (en) 2010-07-27

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CA2521370A Expired - Fee Related CA2521370C (en) 2003-04-08 2004-03-13 Biosensor system

Country Status (8)

Country Link
US (1) US7638033B2 (en)
EP (2) EP1467206A1 (en)
JP (1) JP4381413B2 (en)
AT (1) ATE393911T1 (en)
CA (1) CA2521370C (en)
DE (1) DE602004013438T2 (en)
ES (1) ES2304608T3 (en)
WO (1) WO2004090533A1 (en)

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US8721851B2 (en) 2008-11-28 2014-05-13 Panasonic Healthcare Co., Ltd. Sensor chip, biosensor system, method for measuring temperature of biological sample, method for measuring temperature of blood sample, and method for measuring concentration of analyte in blood sample

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Also Published As

Publication number Publication date
JP2006522923A (en) 2006-10-05
EP1613955B1 (en) 2008-04-30
ATE393911T1 (en) 2008-05-15
JP4381413B2 (en) 2009-12-09
US7638033B2 (en) 2009-12-29
DE602004013438D1 (en) 2008-06-12
ES2304608T3 (en) 2008-10-16
DE602004013438T2 (en) 2009-04-23
US20060108236A1 (en) 2006-05-25
CA2521370C (en) 2010-07-27
WO2004090533A1 (en) 2004-10-21
EP1613955A1 (en) 2006-01-11
EP1467206A1 (en) 2004-10-13

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