WO2004040289A1 - 固体成分濃縮手段を備えた測定用具 - Google Patents
固体成分濃縮手段を備えた測定用具 Download PDFInfo
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- WO2004040289A1 WO2004040289A1 PCT/JP2003/013963 JP0313963W WO2004040289A1 WO 2004040289 A1 WO2004040289 A1 WO 2004040289A1 JP 0313963 W JP0313963 W JP 0313963W WO 2004040289 A1 WO2004040289 A1 WO 2004040289A1
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- WIPO (PCT)
- Prior art keywords
- water
- absorbing layer
- electron transfer
- blood
- transfer interface
- Prior art date
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Classifications
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
- C12Q1/001—Enzyme electrodes
- C12Q1/005—Enzyme electrodes involving specific analytes or enzymes
- C12Q1/006—Enzyme electrodes involving specific analytes or enzymes for glucose
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
- C12Q1/001—Enzyme electrodes
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
- C12Q1/001—Enzyme electrodes
- C12Q1/005—Enzyme electrodes involving specific analytes or enzymes
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- 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
- G01N27/3272—Test elements therefor, i.e. disposable laminated substrates with electrodes, reagent and channels
Definitions
- the present invention relates to a measuring instrument used for measuring the concentration of a specific component (for example, glucose / cholesterol) in a sample liquid such as blood.
- a specific component for example, glucose / cholesterol
- a reaction system is constructed using a test solution, an oxidoreductase, and an electron transfer substance. Is used to calculate the concentration of the specific component.
- a reaction system is constructed, for example, on a biosensor provided with a reagent section containing a oxidoreductase or an electron transfer substance.
- the oxidoreductase catalyzes a redox reaction between the specific component and the electron mediator, so the amount of the reduced (or oxidized) electron mediator depends on the concentration of the specific component. Will be reflected.
- the response current is obtained as a function of the amount of electron transfer between the reduced (or oxidized) electron mediator generated in the reaction system and the pulp. Therefore, the measurement accuracy of the response current value has a significant effect on the concentration measurement accuracy.
- the transfer of electrons between the electrode and the electron mediator is inhibited by the blood cells on the surface of the pump. Will be done.
- the measured response current value becomes lower as the number of blood cells increases, resulting in a measurement error.
- the ratio of blood cells in the blood if hematocrit is different, the measured response current will be different even if the glucose concentration is the same.
- a method of separating blood cells in blood using a measuring instrument for example, a method is used in which a portion for introducing a sample liquid such as blood in a measuring instrument is provided with a dispenser (for example, Japanese Patent Application Laid-Open No. There is a method of covering the surface of an electrode with a polymer film (for example, Japanese Patent Application Laid-Open No. 6-130023, Japan). Japanese Patent Application Laid-Open No. 9-243591 and Japanese Patent Application Laid-Open No. 2000-338076).
- a flow path for moving a sample liquid containing a solid component to provide a liquid-phase reaction field, and a first channel used for applying a pressure to the liquid-phase reaction field are used.
- An analytical tool having an electron transfer interface for supplying electrons to a phase reaction field or receiving electrons from the liquid phase reaction field, and a portion in contact with the electron transfer interface in the liquid phase reaction field
- a measuring device is provided, which is equipped with a concentration means to increase the concentration of solid components at the site.
- the concentration means is constituted by, for example, a water absorbing layer containing a water absorbing polymer material.
- the water-absorbing polymer material must be able to absorb the liquid component while achieving the object of the present invention, and its absorption amount must be an amount that does not affect the measurement results. For this reason, it is preferable to use a material having a water absorbing capacity of 10 to 500 g / g as the water absorbing polymer material.
- the above-mentioned measuring tool is configured to include, for example, a substrate on which first and second electrodes are formed, and a cover laminated on the substrate.
- the water absorbing layer is formed, for example, on at least a portion of the cover facing the electron transfer interface. This: ⁇ , the water-absorbing layer Dimensional force S in the thickness direction of the plate, 1/30 to 1/30 and ⁇ / 5 to 3/5 of the thickness dimension in the flow path, respectively.
- the water-absorbing layer may be formed to be 7 soluble.
- the water absorbing layer may be formed over the entire length or substantially the entire length of the flow path.
- Such a water-absorbing layer can be composed of a cover by forming a force par as containing P and a water-soluble polymer material.
- the water absorbing layer may have a configuration in which a powder containing a water absorbing polymer is supported on a force par.
- the above powder has a weight average particle diameter of 100 to 1000 ⁇ when not absorbing water. This is because the average particle size is unduly small; it is difficult to form a water-absorbing layer to absorb a sufficient amount of water to achieve the purpose, while the average particle size is unduly small. This is because at an older age, the movement of water in the flow path may be unnecessarily hindered.
- Extension 7W1 may be provided downstream of the electron transfer interface in the flow direction of the sample liquid in the flow path.
- the water-absorbing layer is provided on at least one of the substrate and the force par, for example.
- the size of the sample in the flow direction of the sample solution should be adjusted from the inlet of the flow path to the most downstream point in the flow direction of the sample solution at the electron transfer interface. For the distance, 1/4 to 1/2 is preferable.
- the spreading layer is formed so that the thickness dimension force S0 to 15 ⁇ m of the portion where the water absorbing layer is formed in the flow channel at the time of absorbing water.
- the P-water layer can be formed so as to have a portion formed at at least one of a position adjacent to the electron transfer interface on the upstream side and a position adjacent on the downstream side.
- the water absorbing layer has both a portion formed at a position adjacent to and upstream of the electron transfer interface and a portion formed at a position adjacent to and downstream of the electron transfer interface. Preferably, it is formed so as to surround the periphery of the electron transfer interface.
- the concentrating means is provided downstream of the electron transfer interface in the flow direction of the sample liquid in the flow path, and may be constituted by a hardly water-absorbing dam for inhibiting the movement of the force solid component.
- the dam section should be shaped so that the solid components can be concentrated as desired.
- the thickness dimension force of the flow path in the formed part is formed to be, for example, 5 to 15 ⁇ m.
- sample solution to be measured typically, blood containing blood cells as a solid component can be mentioned.
- the measurement tool of the present invention can be widely used for a sample solution containing a solid component, and the sample solution to be measured is not limited to blood.
- FIG. 1 is an overall view of a pyro sensor according to a first embodiment of the present invention.
- FIG. 2 is an exploded perspective view of the biosensor shown in FIG.
- FIG. 4A and FIG. 4B are cross-sectional views corresponding to FIG. 3 for explaining a moving state of blood in the internal flow path of the Noo sensor.
- FIG. 5 is a schematic diagram showing a state where the biosensor shown in FIG. 1 is mounted on a concentration measuring device.
- FIG. 6 is a cross-sectional view showing a biosensor according to the second embodiment of the present invention and corresponding to FIG.
- FIG. 7 is a cross-sectional view showing a biosensor according to the third embodiment of the present invention, corresponding to FIG.
- FIG. 8A and FIG. 8B are cross-sectional views corresponding to FIG. 3 showing a biosensor according to a fourth embodiment of the present invention.
- FIG. 9 is a cross-sectional view corresponding to FIG. 3 showing a pyro sensor according to a fifth embodiment of the present invention.
- FIG. 10A and FIG. 10B are perspective views showing a state where the copper and the spacer have been removed from the pyrosensor shown in FIG.
- FIG. 11 is a graph showing a time course of a response current value in the biosensor of the first embodiment.
- FIG. 12 is a graph showing a time course of a response current value in the PY sensor of Comparative Example 1.
- FIG. 13 is a graph showing the influence of the hematocrit value (Hct) in the pyrosensor of Example 1.
- FIG. 14 is a graph showing the effect of the hematocrit value (Hct) on the biosensor of Comparative Example 1.
- FIGS. 1 to 5 taking a case of measuring a blood glucose level as an example.
- the biosensor 1 shown in FIGS. 1 and 2 is used to measure the glucose concentration in blood, and is used by being attached to a concentration measuring device 2 (see FIG. 5).
- This biosensor 1 has a configuration in which a force par 5 is laminated on a long rectangular substrate 3 via a pair of spacers 40 and 41, and as shown in FIG. Elements 3, 40, 41, and 5 form a cavity 6.
- the capillary 6 has an internal flow path 60 for moving blood using capillary action and retaining captive blood.
- the internal flow path 60 extends in the short direction of the fiber 3 and communicates with the outside through end openings 61 and 62.
- the end opening 61 is used to introduce blood into the internal flow channel 60
- the opening 62 is used to introduce blood into the internal flow channel 60 when blood flows through the internal flow channel 60. It is used for discharging gas.
- the pair of spacers 40 and 41 are for joining the cover 5 to the substrate 3 and for defining the dimensions of the internal flow path 60 of the cabinet 6. is there.
- the pair of spacers 40 and 41 are arranged so as to extend in the lateral direction of the substrate 3 and are spaced apart in the longitudinal direction of the substrate 3. '
- a working electrode 31 and a counter electrode 32 extending in the longitudinal direction of R 3 are formed on the upper surface 30 of the substrate 3.
- a reagent section 33 is further provided on the upper surface 30 of the substrate 3 so as to traverse the working electrode 31 and the counter electrode 32 in a series.
- the part of the working electrode 31 which is removed from the reagent part 33 constitutes an electron transfer part 31a.
- the reagent section 33 is formed in a solid state containing, for example, a oxidoreductase and an electron transfer substance.
- a oxidoreductase for example, glucose oxidase and gnorecose dehydrogenase are used.
- Electron mediators are oxidized by the application or reaction of E, and are reduced.For measurement of blood glucose level, for example, a ferricyanide force rim is used as an electron mediator. .
- the electron transfer substance is contained as an oxidized form before the blood is supplied.
- a water absorbing layer 51 is formed on one surface 50 of the cover 5.
- the water absorbing layer 51 is formed on one surface 50 of the cover 5 so as to face the electron transfer portion 31 a located in the internal channel 60 of the working electrode 31.
- a water-absorbing layer 51 can be formed by attaching a water-absorbing sheet containing P and a water-soluble polymer material to the force par 5.
- the thickness of the water absorbing layer 51 is, for example, 1/30 to 1/10 of the height H of the internal flow channel 60 when water is not absorbed, and the thickness of the internal flow channel 60 is H when water is applied. It is formed so as to be 1/5 to 3/5.
- water absorbing polymer material for example, a material having a water absorbing capacity of 10 to 500 g / g is used. More specifically, examples of P and water biopolymer materials include crosslinked products of acrylic acid, crosslinked products of vinyl alcohol monoacrylate copolymer, crosslinked products of maleic anhydride graft polybutyl alcohol, and the like.
- a crosslinked isoptylene-maleic anhydride copolymer, carboxymethylcellulose can be used: a crosslinked product, a crosslinked product of a partially neutralized polyatalylic acid can be used.
- the water-absorbing layer 51 may be formed entirely of a water-absorbing polymer material, or may be formed as a layer in which a water-absorbing polymer material is mixed with another non-water-absorbing 'I' biopolymer material.
- the water-absorbing layer 51 can be formed by, for example, applying a night in which a water-absorbing polymer material is dissolved in a solvent to the cover 5 and then drying it.
- the concentration measuring device 2 includes first and second terminals 20a and 20b, a ⁇ 1 ⁇ applying unit 21, a current value measuring unit 22, a detecting unit 23, a control unit 24, a calculating unit 25,
- the display unit 26 is provided.
- the first and second terminals 20a and 20b are provided with the pyro sensor 1 attached to the concentration measuring device 2: at the ⁇ and at the ends 31 b and 32 b of the working electrode 31 and the counter electrode 32 in the bio sensor 1. It is to make it.
- the application section 21 is connected to the pyro sensor 1 via the first and second terminals 20a and 20b. This is for applying 3 ⁇ 4
- the 3 ⁇ 4ff application unit 21 is electrically connected to the first and second terminals 20a and 20b.
- the application unit 21 is configured, for example, as a battery having a dry cell and a DC battery such as a rechargeable battery.
- the current value measurement 22 is for measuring a current value when a voltage is applied between # 31b and 32b of the working electrode 31 and the counter electrode 32 by the E applying unit 21.
- the detecting unit 23 detects the reagent 33 based on the current value measured by the current value measuring unit 22 (see FIGS. 1 to 3). ) Is to detect whether or not the sample liquid is supplied.
- the control unit 24 controls the application unit 21 to select a state in which E is applied between the working electrode 31 and the counter electrode 32 and a state in which E is not applied.
- the calculating section 25 is for calculating a blood glucose level according to the current value measured by the current value measuring section 22.
- the calculation unit 25 is configured to be able to calculate, for example, a blood sugar level based on an amperometric method.
- the detection unit 23, the control unit 24, and the calculation unit 25 can be configured by connecting a plurality of memories (for example, a memory and a RAM) to one CPU, for example.
- the display unit 26 is for displaying, for example, an error, an operation procedure, and the like, in addition to the calculation result by the calculation unit 25, and is configured by, for example, a liquid crystal display device.
- the biosensor 1 is set in the concentration measuring device 2 as shown in FIG. Then, the working electrodes 31 and 3 of the sensor 1 and the end portions 31 b and 32 of the counter electrode 32 are disintegrated with the first and second terminals 20 a and 20 b of the concentration measuring device 2. , It is possible to apply E between the working electrode 31 and the counter electrode 32 via the first and second terminals 20a and 20b.
- the constant is applied between the working electrode 31 and the counter electrode 32 from the time when the pyro sensor 1 is attached to the device 2.
- the constant applied between the working electrode 31 and the counter electrode 32 is, for example, 100 to 1000 mV.
- the constant mark calo between the working electrode 31 and the counter electrode 32 is maintained until the response current for calculating the blood sugar level is measured. It is assumed that Next, blood is supplied through the end opening 61 of the biosensor 1. As shown in FIGS. 4A and 4B, the blood BL travels through the internal flow path 60 from the end opening 61 to the end opening 62 of the capillary 6 by capillary action. The introduction of the blood BL is performed until the blood BL reaches the end opening 62 and the internal channel 60 of the cabillary 6 is filled with the blood BL, as clearly shown in FIG. 4B. In this process, the blood BL dissolves the reagent 33 (see FIG.
- a liquid phase reaction system is established in the internal flow channel 60.
- the plasma component in the blood L is absorbed by the P and water layers 51, and the thickness of the water absorption layer 51 is increased.
- the movement of the blood cell B1 is inhibited by the water-absorbing layer 51, and the concentration of the blood cell B1 on the surface and around the electron transfer unit 31a in the working electrode 31 increases.
- glucose in blood L is oxidized by oxidoreductase, and the electron mediator is reduced.
- the reduced electron transport material moves to the surface of the electron transfer portion 31a in the working electrode 31, supplies electrons to the electron transfer portion 31a, and returns to the oxidized electron transfer material. .
- the amount of electrons supplied to the electron transfer unit 31a is measured as a response current by the current value measurement unit 22 via the first and second terminals 20a and 20b.
- the response current value measured by the current value measurement unit 22 is monitored by the detection unit 23, and when the response current value exceeds the threshold value, the detection unit 23 supplies blood to the reagent unit 33. Then, it is detected that the reagent section 33 has been dissolved. If the detection unit 23 detects that blood has been supplied, the detection unit 23 determines whether or not a certain time has elapsed since the detection.
- ⁇ indicates a response current value in the current value measurement unit 22 and, based on the response current value, a blood glucose level in the calculation unit 25. Is calculated.
- the blood glucose level is calculated by grouping the response current values into mm values and applying this voltage value to a previously created curve showing the relationship between the blood pressure level and the blood glucose level.
- the calculation result in the calculation unit 25 is displayed on the display unit 26, for example.
- the plasma component of the blood 3 ⁇ 4BL is absorbed in the spreading layer 51, and the electron transfer section 31a of the working electrode 31 is formed. Blood cell B1 concentration on and around the surface. As a result, the electronic transfer section 31a The surface and surroundings are in a state similar to that of supplying pseudo-high blood clit blood BL.
- a water-absorbing 'I' biopolymer tree material for example, having a water-absorbing capacity of 10 to 500 g / g is used, the lower the hematocrit value of blood L, the more the water-absorbing layer 51 will absorb more plasma.
- the water absorption layer 51A is formed over the entire length of the cabillary 6.
- the water absorbing layer 51A can be formed, for example, by forming a water absorbing sheet using a water absorbing polymer material and attaching the water absorbing sheet to a cover. 7)
- the layer 51 can also be formed by applying a solution prepared by dissolving a water-absorbing polymer material in a solvent together with an adhesive component to a power pad, and drying this.
- the entire cover 5 may be configured to have a water-absorbing property, and the entire force par 5 may be configured as a water-absorbing layer.
- Such a water-absorbing layer (cover) can be formed, for example, by kneading a water-absorbing polymer material with another resin material to form a molding material, and performing resin molding using this molding material.
- the water-absorbing layer 51B has particles of the water-absorbing polymer. It is configured as something.
- the water-absorbing layer 51B has a structure in which water-absorbing polymer particles 51Bb are supported on one side of a double-sided tape 51Ba, and is adhered to a force-purifying member by utilizing the adhesiveness of the other side of the double-sided tape. Is being worn.
- As the water-absorbing polymer it is preferable to use those having a weight average particle diameter of 100 to 1,000 / m.
- FIGS. 8A and 8B Next, a biosensor according to a fourth embodiment of the present invention will be described with reference to FIGS. 8A and 8B.
- the water-absorbing layer 51C is formed on the channel 3 downstream of the electron transfer section 31a of the working electrode 31 in the blood flow direction.
- the water absorbing layer 51C may be formed on the cover 5.
- the water absorbing layer 51C has a distance L0 between the water absorbing layer 51C and the upper surface of the capillary when the cavity 6 is filled with blood. It is preferable to form it as follows. In order to more reliably increase the concentration of blood cells B1 around the electron transfer section 31a, it is preferable to set the dimension W1 of the blood BL in the water absorbing layer 51C 'in the flow direction to be relatively large. In this case, the dimension W1 is preferably set to be 1/4 to 1/2 mm of the distance W2 from the entrance end 68 of the cavity 6 to the downstream end 31a of the electron transfer section 31a.
- a function similar to that of the water absorbing layer 51C shown in FIGS. 8A and 8B can also be achieved by providing a non- (hard K-soluble) dam. That is, by absorbing plasma components, Instead of inflating and retaining blood cells, the cross-sectional dimension of the downstream side of the electron transfer unit 31a in the cabillary 6 may be reduced in advance before blood is supplied by forming a dam portion.
- This dam portion is preferably formed so that the distance (corresponding to L in FIG. 8B) force between the dam portion and the substrate (or cover) is 5 to 15 ⁇ m. ⁇ It may be formed on any of the covers.
- FIGS. 10B a biosensor according to a fifth embodiment of the present invention will be described with reference to FIGS. This will be described with reference to FIG. 10B.
- the water absorbing layer 51D is formed as having a portion adjacent to the electron transfer section 31a of the working electrode 31.
- the water-absorbing layer 51D may be arranged at two positions, upstream and downstream, with respect to the electron transfer unit 31a (see FIG. 9) as shown in FIG. 10A, or as shown in FIG. 10B. It may be formed in a rectangular frame shape. In the embodiment shown in FIG. 10A, one of the two water absorbing layers 51D may be omitted.
- the present invention relates to the case of measuring other components in blood, such as cholesterol, lactic acid, and bilirubin. It can also be applied to sample liquids other than blood.
- a biosensor was formed in the same configuration as that shown in FIGS.
- the length dimension L, width dimension W, and height dimension H of the internal channel 60 of the cabilli 6 were 3 mm, 1 thigh, and 40 ⁇ , respectively (see FIGS. 1 and 3).
- the working electrode 31 and the counter electrode 32 were formed by screen printing using carbon ink (“Electrodag 423SSJ” manufactured by Nippon Acheson Co.)
- the reagent section 33 had a two-layer structure including an electron transfer layer and a nitrogen-containing layer.
- the electron transfer layer was formed by applying 0.4 ⁇ L of the first material liquid containing the electron transfer substance to the substrate 3 and then blowing and drying the first material liquid (30 ° C., 10% Rh).
- the enzyme-containing layer is prepared by applying 0.3 ⁇ L of the second material solution containing oxidoreductase onto the electron transport layer, and then air-drying the second material solution (30 ° C, 10% Rh). Formed.
- the first material liquid is prepared by mixing the liquid components shown in (1) to (4) in Table 1 in the order shown below, mixing them for 1 to 3 days, and then adding an electron transfer substance to the mixed liquid. Prepared.
- the second material solution was prepared by dissolving oxidoreductase in 0.1% CHAPS.
- the SWN used was “3150” manufactured by Corp Chemikano
- the CHAPS used was “KC062” manufactured by Dojinka ⁇ F RISO
- the ACES used was “ED067” manufactured by Dojinka Research.
- ACES-Firewood Night was adjusted to pH 7.5.
- the water-absorbing layer 51 is formed by applying 0.1 ⁇ L of a coating material containing the water-absorbing 'I biopolymer to the target portion of the cover 5 and then drying the coating material by blowing air (30 ° C 10% Rh) to obtain an Ml. Was formed to be 2 m.
- the coating material used was prepared by dissolving 7 parts by weight of a water-absorbing polymer (“Aquacoc” manufactured by Sumitomo Seika Co., Ltd.) in 100 parts by weight of methanol.
- the response current was measured using the above-mentioned biosensor, and the glucose concentration was 447 mg / dL, and the hematocrit value (hereinafter referred to as "Hct") was three different types of blood (Hct20%, Hct42%, Hct69%) was measured as a time course.
- the response current was measured five times for each Hct blood.
- the amount of blood supply to the internal flow channel 60 of the biosensor 1 was 0.5 / iL
- the applied voltage between the working electrode 31 and the counter electrode 32 was 500 mV up to iB.
- Figure 11 shows the results. -On the other hand, the effect of Hct was examined based on the response current value 5 seconds after blood supply. The results are shown in FIG.
- the horizontal axis represents Hct (%), and the vertical axis represents the deviation (Bias (%)) from the response current value when Hct is 42%.
- Bias (%) Is shown as the average of five measurements.
- the biosensor of Example 1 was used, except that the water-absorbing layer was omitted.
- the time course of the response current value was measured.
- the response current value was measured five times for each Hct blood sample. The results are shown in FIG.
- Figure 14 shows the results.
- the biosensor of Example 1 in which blood with different Hct values was measured tends to converge the response current value faster than the biosensor of Comparative Example 1.
- the biosensor of Example 1 has an Hct of 20% and an Hct of 69% compared to the biosensor of Comparative Example 1.
- the response current value of each sample is uniform in about 8 seconds.
- the biosensor of Comparative Example 1 it took 15 seconds for each sample response current value to be uniform.
- the biosensor of Example 1 can perform concentration measurement appropriately even in a shorter measurement time than the biosensor of Comparative Example 1.
- the biosensors of Example 1 and Comparative Example 1 had a small volume of 0.5 ⁇ L of the internal channel 60 of the capillary 6, the biosensor of Example 1 could measure a small amount of blood with high accuracy. I can say.
- the biosensor of Example 1 had lower reproducibility than the biosensor of Comparative Example 1.This was because the coating material was applied by hand when forming the water absorbing layer 51. It is thought that this was due to paralysis in the formation state. Therefore, it is considered that the reproducibility will be improved if the uniform water absorbing layer 51 is formed.
- the biosensor of Example 1 has a bias of about + 5% with respect to the response current value 5 seconds after the start of blood supply. In contrast, in the biosensor of Comparative Example 1, the bias was around ⁇ 20%. Let's do it.
- the measuring tool according to the present invention it is possible to suppress the influence of the solid components in the sample liquid and maintain the measurement time short, while performing the concentration measurement accurately with a small amount of the sample liquid. it can.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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EP03770055A EP1557663B1 (en) | 2002-11-01 | 2003-10-30 | Measuring instrument provided with sold component concentrating means |
JP2004548094A JP4341032B2 (ja) | 2002-11-01 | 2003-10-30 | 固体成分濃縮手段を備えた測定用具 |
DE60315331T DE60315331T2 (de) | 2002-11-01 | 2003-10-30 | Mit solid-komponenten konzentrationsmitteln ausgestattetes messinstrument |
US10/533,602 US7201042B2 (en) | 2002-11-01 | 2003-10-30 | Measuring instrument provided with solid component concentrating means |
AU2003280660A AU2003280660A1 (en) | 2002-11-01 | 2003-10-30 | Measuring instrument provided with sold component concentrating means |
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JP2002320295 | 2002-11-01 | ||
JP2002-320295 | 2002-11-01 |
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WO2004040289A1 true WO2004040289A1 (ja) | 2004-05-13 |
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US (1) | US7201042B2 (ja) |
EP (1) | EP1557663B1 (ja) |
JP (1) | JP4341032B2 (ja) |
CN (2) | CN101561410B (ja) |
AT (1) | ATE368748T1 (ja) |
AU (1) | AU2003280660A1 (ja) |
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Cited By (3)
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JP2008298598A (ja) * | 2007-05-31 | 2008-12-11 | Canon Inc | 微小流体素子とその利用方法およびその製造方法 |
JP2010534839A (ja) * | 2007-07-26 | 2010-11-11 | ホーム ダイアグナスティックス,インコーポレーテッド | 時間分割アンペロメトリを用いる被分析物濃度の測定システム及び測定方法 |
US8574424B2 (en) | 2007-07-26 | 2013-11-05 | Nipro Diagnostics, Inc. | System and methods for determination of analyte concentration using time resolved amperometry |
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- 2003-10-30 US US10/533,602 patent/US7201042B2/en not_active Expired - Lifetime
- 2003-10-30 CN CNB2003801027656A patent/CN100510733C/zh not_active Expired - Lifetime
- 2003-10-30 DE DE60315331T patent/DE60315331T2/de not_active Expired - Lifetime
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Also Published As
Publication number | Publication date |
---|---|
ATE368748T1 (de) | 2007-08-15 |
EP1557663A1 (en) | 2005-07-27 |
DE60315331T2 (de) | 2008-02-07 |
JP4341032B2 (ja) | 2009-10-07 |
US7201042B2 (en) | 2007-04-10 |
JPWO2004040289A1 (ja) | 2006-03-02 |
CN101561410A (zh) | 2009-10-21 |
EP1557663A4 (en) | 2006-05-10 |
CN1711472A (zh) | 2005-12-21 |
CN100510733C (zh) | 2009-07-08 |
AU2003280660A1 (en) | 2004-05-25 |
EP1557663B1 (en) | 2007-08-01 |
US20060042361A1 (en) | 2006-03-02 |
DE60315331D1 (de) | 2007-09-13 |
CN101561410B (zh) | 2012-10-03 |
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