WO2001055712A1 - Dispositif de mesure a biodetecteur, biodetecteur utilise pour ce dispositif, et liquide standard y relatif - Google Patents
Dispositif de mesure a biodetecteur, biodetecteur utilise pour ce dispositif, et liquide standard y relatif Download PDFInfo
- Publication number
- WO2001055712A1 WO2001055712A1 PCT/JP2001/000471 JP0100471W WO0155712A1 WO 2001055712 A1 WO2001055712 A1 WO 2001055712A1 JP 0100471 W JP0100471 W JP 0100471W WO 0155712 A1 WO0155712 A1 WO 0155712A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- electrode
- biosensor
- current value
- oxidation current
- counter electrode
- Prior art date
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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
Definitions
- the present invention relates to a measuring device using an electrode-type biosensor, a biosensor used therein, and a dedicated standard solution.
- FIG. 4 is an exploded perspective view showing an example of the structure of the Darcos sensor.
- Silver leads 4 and 5 are formed on a PET (polyethylene terephthalate) insulating substrate 7 by screen printing or the like. I have.
- a quadrangular working electrode 1 is formed of carbon at the tip of the silver lead 4, and the working electrode 1 has a predetermined gap at the tip of the silver lead 5 with the working electrode 1.
- Counter electrode 2 is formed to surround 1.
- the other ends of the silver leads 4 and 5 are formed with terminals 4a and 5a, respectively, which are connected to the measuring instrument during measurement.
- a hydrophilic polymer CMC force carboxymethylcellulose
- G ⁇ D glucose oxidase
- Felician as a mediator
- a reaction layer 12 composed of a chemical rim is formed so as to bridge and cover both electrodes 1 and 2.
- the cover 18 in which a sample supply groove 10 having an opening 9 at the tip is formed, and the substrate is placed such that the end portion of the sample supply groove 10 is positioned on the reaction layer 12.
- An air hole 11 is formed at the end of the sample supply groove 10 attached to the sample supply groove 10.
- the sensor having the above configuration is mounted on the small and simple measuring device for measuring a blood glucose level, and when the blood sample to be measured is brought into contact with the opening 9 of the sample supply groove 10, the capillary is supplied through the sample supply groove 10. Due to the phenomenon, a certain amount (about 3 ⁇ L) of The sample is introduced, a predetermined reaction occurs, and a current value associated with the reaction is read by the measuring device through the terminals 4a and 5a, and from the current value, glucose of the substance to be measured is measured. It measures the content.
- the field of data management such as management and processing of measurement data
- the measuring instruments sequentially store measurement values, It is configured so that changes and average values can be easily checked.
- it is necessary to maintain and control the accuracy of biosensors and measuring devices. I have.
- measurement data for accuracy control using a dedicated glucose standard solution and measurement data for blood used as a normal sample should not be confused and processed.
- the device has been devised.
- the present invention has been made in order to solve the above-described problems, and has a measurement device capable of automatically determining a sample liquid type without any artificial pre-operation and a bag used therein.
- the purpose is to provide a standard solution and a dedicated standard solution. Disclosure of the invention
- the invention described in claim 1 of the present invention relates to a method for measuring an object to be measured in a sample liquid on a working electrode, a counter electrode, and a third electrode provided on an insulating substrate so as to bridge the respective electrodes.
- the sample liquid type can be automatically determined based on the oxidation current value obtained between the third electrode and the counter electrode or between the third electrode and the working electrode after the sample liquid is introduced. Without this, it is possible to automatically determine the sample liquid type.
- An invention according to claim 2 of the present invention is a measurement device using the biosensor according to claim 1, wherein the determination of the sample liquid type based on the oxidation current value is performed.
- the oxidation current value obtained between the third electrode and the counter electrode or between the third electrode and the working electrode is compared with a predetermined threshold value. It is.
- the sample liquid type can be automatically determined based on the oxidation current value obtained between the third electrode and the counter electrode or between the third electrode and the working electrode after the sample liquid is introduced. Without this, it is possible to automatically determine the sample liquid type.
- An invention according to claim 3 of the present invention is a measurement device using the biosensor according to claim 1, wherein the determination of the sample liquid type based on the oxidation current value is performed.
- the method is characterized in that the determination is performed based on a time change amount of an oxidation current value obtained between the third electrode and the counter electrode or between the third electrode and the working electrode.
- the sample liquid type can be automatically determined based on the oxidation current value obtained between the third electrode and the counter electrode or between the third electrode and the working electrode after the sample liquid is introduced. Without this, it is possible to automatically determine the sample liquid type.
- an invention according to claim 4 of the present invention is a measurement device using the biosensor according to claim 1, wherein the oxidation current value used for determination is the third oxidation current value. After the current value flowing between the second electrode and the counter electrode or between the third electrode and the working electrode reaches a predetermined current value, and furthermore, it is determined that the current value is a value measured when a certain time has elapsed. It is a feature.
- the biosensor according to claim 5 of the present invention includes a working electrode, a counter electrode, and a third electrode provided on an insulating substrate.
- a reaction layer that reacts with the substance to be measured is provided, and connection terminals that are electrically connected to the working electrode, the counter electrode, and the third electrode are provided on the insulating substrate. is there.
- an oxidation current value obtained between the third electrode and the counter electrode or between the third electrode and the working electrode can be measured by a measuring device using the biosensor. It is possible to automatically determine the sample liquid type without any artificial pre-operation.
- the biosensor according to claim 6 of the present invention is the biosensor according to claim 5, wherein the third electrode is more easily oxidized than a working electrode and a counter electrode. It is characterized by being composed of a material.
- the invention according to claim 7 of the present invention is the biosensor according to claim 5, wherein a dissolution potential of the material of the third electrode is applied to the biosensor. Characterized by a material lower than the applied voltage. This makes it possible to measure the oxidation current value obtained between the third electrode and the counter electrode or between the third electrode and the working electrode by the measuring device using the biosensor after the sample liquid is introduced into the biosensor. It is possible to automatically determine the sample liquid type without any special pre-operation.
- the invention according to claim 8 of the present invention is the biosensor according to claim 7, wherein the material of the third electrode is silver, copper, zinc, or any of them. Characterized in that it is a mixed material containing
- the invention described in claim 9 of the present invention is characterized in that the working electrode, the counter electrode, and the third electrode provided on the insulating substrate are provided in the sample solution so as to bridge the respective electrodes.
- the content of the measurement target substance is determined from the current value generated by the reaction between the measurement target substance and the reaction layer obtained between the working electrode and the counter electrode.
- a standard solution dedicated to a biosensor used in the device, wherein a substance for suppressing an oxidation current value obtained by oxidation of the third electrode is compounded.
- the oxidation current value generated from the third electrode when the dedicated standard solution is introduced and the oxidation current value generated from the third electrode when blood is measured are significantly different.
- the sample liquid type can be automatically determined without any artificial pre-operation.
- the invention according to claim 10 of the present invention is the biosensor standard solution according to claim 9, wherein an oxidation current obtained by oxidizing the third electrode is suppressed.
- the substance is an organic acid.
- the oxidation current value generated from the third electrode when the dedicated standard solution is introduced and the oxidation current value generated from the third electrode when blood is measured are significantly different.
- the sample liquid type can be automatically determined without any artificial pre-operation.
- the invention according to claim 11 of the present invention is the standard solution for a biosensor according to claim 10, wherein the organic acid is benzoic acid, citric acid, sa It is characterized by being at least one of lylic acid, sorbic acid, dehydroacetoic acid and propionic acid.
- the oxidation current value generated from the third electrode when the dedicated standard solution is introduced and the oxidation current value generated from the third electrode when blood is measured are markedly different. Since they are different, it is possible to automatically determine the sample liquid type without any artificial pre-operation using the above-described measuring device using the biosensor.
- FIG. 1 is an exploded perspective view of a glucose sensor according to one embodiment of the present invention.
- FIG. 2 is a perspective view of a glucose meter according to one embodiment of the present invention.
- FIG. 3 is a diagram showing an oxidation current waveform in one embodiment of the present invention.
- FIG. 4 is an exploded perspective view of a conventional glucose sensor. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 is an exploded perspective view showing the structure of a glucose sensor according to an embodiment of the present invention, and the same components as those of the conventional sensor shown in FIG. 4 are denoted by the same reference numerals.
- the point different from the conventional sensor is that a silver lead 6 is further provided in addition to the silver leads 4 and 5, and a third tip for discriminating the sample liquid type is provided at the tip of the silver lead 6.
- An electrode 3 is arranged on the air hole 11 side near the working electrode 1 and the counter electrode 2, and a connection terminal portion 6a is formed at the other end.
- the reaction layer 12 covers the working electrode 1, the counter electrode 2, and the third electrode 3 so as to cover them. Is formed.
- the third electrode 3 may be arranged at any position as long as it is in contact with the measurement sample.
- the third electrode 3 is made of a material that is more easily oxidized than the working electrode 1 and the counter electrode 2, and corresponds to, for example, silver, copper, zinc, or a mixed material containing them. In the present embodiment, a silver electrode is used as the third electrode 3.
- the measuring device shown in FIG. 2 is used for the sensor.
- the power of the measuring device 14 is turned on, and the voltage between the working electrode 1 and the third electrode 3 or between the counter electrode 2 and the third electrode 3 is 0.
- the device enters a standby state where a voltage of 5 V is applied. This applied voltage is lower than the melting potential of the material used for the third electrode 3, and the applied voltage value differs depending on the material of the third electrode 3.
- a certain amount (here, about 3 ⁇ m) is supplied to the reaction layer 12 and each electrode portion by capillary action through the sample supply groove 10.
- Sample is introduced.
- the oxidation current measured by the third electrode 3 exceeds a certain amount (here, 0.3 // ⁇ 0.5 seconds)
- the application of the voltage to the sensor 13 is stopped once.
- the reaction is cultured for a predetermined time.
- the voltage is re-applied, and the current value corresponding to the blood sugar level is measured.
- the current value corresponding to the blood glucose level is measured by applying a voltage of 0.5 V between the working electrode 1 and the counter electrode 2, or between the working electrode 1 and the counter electrode 2, and between the third electrode 3 and the third electrode 3. This is done by measuring the current value obtained at the working electrode 1 at that time.
- a special standard solution used for the measuring device 14 using the glucose sensor according to the present invention will be described.
- the dedicated standard solution is characterized in that a substance that suppresses oxidation current is further blended into a conventional standard solution containing a certain amount of glucose.
- the substance that suppresses the oxidation current may be any organic acid, such as benzoic acid, citric acid, salicylic acid, sorbic acid, dehydroacetoic acid, and propionic acid.
- a special standard solution containing 0.1% by weight of benzoic acid is used. The same effect is obtained when the amount of benzoic acid is 0.01% by weight or more.
- a voltage of 0.5 V with respect to the counter electrode 2 is applied to the third electrode 3 shown in FIG. 1, and the apparatus waits until the measurement sample is introduced.
- a voltage of 0.5 V is applied to the third electrode 3 with reference to the counter electrode 2
- 0.5 is applied to the third electrode 3 with reference to the working electrode 1.
- a voltage of V may be applied.
- the measurement sample is introduced from the opening 9 of the sample supply groove 10 and reaches the third electrode 3.
- an oxidation current is generated at the third electrode 3.
- FIG. 3 shows the oxidation current value obtained by the third electrode 3 after the measurement sample was introduced, and FIG. 3 (a) shows the oxidation current value during normal blood measurement. Fig. 3 (b) shows the oxidation current value when measuring the dedicated standard solution.
- the oxidation current during the measurement of the dedicated standard solution is suppressed by the effect of benzoic acid in the standard solution, and as time passes, the oxidation current during the normal blood measurement shown in Fig. 3 (a) Compared with the rise of the current value, the rise of the current value of the dedicated standard solution shown in FIG. 3 (b) is significantly smaller.
- the measuring device 14 detects an oxidation current value obtained from the third electrode 3 after the measurement sample is introduced into the sensor 13 and a predetermined time has elapsed, and the detected oxidation current value Is compared with a predetermined threshold value, it is possible to automatically determine whether the sample liquid type is a standard liquid sample or a blood sample. Also, as shown in Fig. 3, the difference in the oxidation current value used to determine the sample liquid type becomes remarkable with the passage of time, so the voltage is re-applied and the current value corresponding to the blood glucose level is measured. If the oxidation current value obtained from the third electrode 3 immediately before is used for discrimination of the sample liquid type, it is possible to more accurately determine the sample liquid type.
- the oxidation current value detected from the third electrode 3 fluctuates due to the effect of the glucose concentration as a substrate, determining the threshold value in consideration of the effect of the glucose concentration enables more accurate discrimination. It becomes possible.
- a blood sample having three types of glucose concentrations of 50, 200, and 600 (mg / d 1) and a standard solution sample were prepared as measurement samples.
- the standard solution contains 0.1% by weight of benzoic acid.
- the oxidation current value of the standard solution is significantly smaller than the oxidation current value of the whole blood sample, so that the glucose concentration is between 20 and 600 (mg / d1).
- the sample liquid type is a standard liquid sample or a blood sample. Also, if the above is programmed in advance in the measuring device 14, the current value corresponding to the blood glucose level after the re-application of the voltage is displayed and stored, and the whole blood sample and the standard solution sample are automatically displayed. Can be displayed and stored separately.
- a glucose sensor is taken as an example.
- a measuring device, sensor, and standard solution for a simple electrode biosensor such as cholesterol and lactic acid.
- the sample liquid type may be determined based on the difference in the time variation of the oxygen current value obtained from the third electrode 3.
- the present invention provides a measuring device capable of automatically discriminating the sample liquid type without any artificial pre-operation, a sensor used therein, and a dedicated standard solution.
- the oxidation current value obtained by the third electrode when the dedicated standard solution is used as a sample and the oxidation current obtained by the third electrode when blood is used as a sample are remarkably different. The difference is used to determine the sample liquid type.
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Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01946936A EP1172649B1 (en) | 2000-01-25 | 2001-01-25 | Glucose measuring device and method comprising biosensor and an exclusive glucose standard solution |
US09/937,300 US6881322B2 (en) | 2000-01-25 | 2001-01-25 | Measuring device using biosensor and biosenor used for it, and dedicated standard liquid |
DE60138856T DE60138856D1 (de) | 2000-01-25 | 2001-01-25 | Glucose messgerät und messmethode enthaltend einen biosensor und eine spezielle glucose-masslösung |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000-15320 | 2000-01-25 | ||
JP2000015320A JP3982133B2 (ja) | 2000-01-25 | 2000-01-25 | バイオセンサを用いた測定装置並びにそれに使用されるバイオセンサおよび専用標準液 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001055712A1 true WO2001055712A1 (fr) | 2001-08-02 |
Family
ID=18542641
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2001/000471 WO2001055712A1 (fr) | 2000-01-25 | 2001-01-25 | Dispositif de mesure a biodetecteur, biodetecteur utilise pour ce dispositif, et liquide standard y relatif |
Country Status (6)
Country | Link |
---|---|
US (1) | US6881322B2 (ja) |
EP (1) | EP1172649B1 (ja) |
JP (1) | JP3982133B2 (ja) |
CN (1) | CN1172182C (ja) |
DE (1) | DE60138856D1 (ja) |
WO (1) | WO2001055712A1 (ja) |
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EP0735363A1 (en) * | 1991-10-18 | 1996-10-02 | Matsushita Electric Industrial Co., Ltd. | A biosensor and a method for measuring a concentration of a substrate in a sample |
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IT1158856B (it) * | 1978-06-16 | 1987-02-25 | Sclavo Inst Sieroterapeut | Sistema elettrodico con elettrodo di riferimento senza giunzione liquida per misure voltammetriche |
JPS57118152A (en) * | 1981-01-14 | 1982-07-22 | Matsushita Electric Ind Co Ltd | Enzyme electrode |
JPS63139245A (ja) | 1986-12-01 | 1988-06-11 | Matsushita Electric Ind Co Ltd | バイオセンサ |
JPS63317097A (ja) | 1987-06-19 | 1988-12-26 | Matsushita Electric Ind Co Ltd | バイオセンサ |
JPH01134246A (ja) | 1987-11-19 | 1989-05-26 | Matsushita Electric Ind Co Ltd | バイオセンサ |
JP2502666B2 (ja) * | 1988-01-29 | 1996-05-29 | 松下電器産業株式会社 | バイオセンサ及びその製造方法 |
FR2701117B1 (fr) * | 1993-02-04 | 1995-03-10 | Asulab Sa | Système de mesures électrochimiques à capteur multizones, et son application au dosage du glucose. |
US5650062A (en) * | 1995-03-17 | 1997-07-22 | Matsushita Electric Industrial Co., Ltd. | Biosensor, and a method and a device for quantifying a substrate in a sample liquid using the same |
US5582697A (en) | 1995-03-17 | 1996-12-10 | Matsushita Electric Industrial Co., Ltd. | Biosensor, and a method and a device for quantifying a substrate in a sample liquid using the same |
-
2000
- 2000-01-25 JP JP2000015320A patent/JP3982133B2/ja not_active Expired - Lifetime
-
2001
- 2001-01-25 DE DE60138856T patent/DE60138856D1/de not_active Expired - Lifetime
- 2001-01-25 US US09/937,300 patent/US6881322B2/en not_active Expired - Lifetime
- 2001-01-25 EP EP01946936A patent/EP1172649B1/en not_active Expired - Lifetime
- 2001-01-25 CN CNB018001238A patent/CN1172182C/zh not_active Expired - Lifetime
- 2001-01-25 WO PCT/JP2001/000471 patent/WO2001055712A1/ja active Application Filing
Patent Citations (1)
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EP0735363A1 (en) * | 1991-10-18 | 1996-10-02 | Matsushita Electric Industrial Co., Ltd. | A biosensor and a method for measuring a concentration of a substrate in a sample |
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EP1172649A4 (en) | 2002-05-08 |
CN1363037A (zh) | 2002-08-07 |
US20020179440A1 (en) | 2002-12-05 |
US6881322B2 (en) | 2005-04-19 |
EP1172649B1 (en) | 2009-06-03 |
JP3982133B2 (ja) | 2007-09-26 |
CN1172182C (zh) | 2004-10-20 |
DE60138856D1 (de) | 2009-07-16 |
JP2001208718A (ja) | 2001-08-03 |
EP1172649A1 (en) | 2002-01-16 |
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