WO2009060878A1 - 電気化学測定装置用電極およびバイオセンサ用電極 - Google Patents
電気化学測定装置用電極およびバイオセンサ用電極 Download PDFInfo
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- WO2009060878A1 WO2009060878A1 PCT/JP2008/070156 JP2008070156W WO2009060878A1 WO 2009060878 A1 WO2009060878 A1 WO 2009060878A1 JP 2008070156 W JP2008070156 W JP 2008070156W WO 2009060878 A1 WO2009060878 A1 WO 2009060878A1
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- Prior art keywords
- electrode
- electrochemical measurement
- measurement device
- hydrogen peroxide
- iridium
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- 238000002848 electrochemical method Methods 0.000 title claims abstract description 84
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 194
- 239000000126 substance Substances 0.000 claims abstract description 72
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 claims abstract description 56
- 229910052741 iridium Inorganic materials 0.000 claims abstract description 55
- WUAPFZMCVAUBPE-UHFFFAOYSA-N rhenium atom Chemical compound [Re] WUAPFZMCVAUBPE-UHFFFAOYSA-N 0.000 claims abstract description 47
- 229910052702 rhenium Inorganic materials 0.000 claims abstract description 46
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 30
- 239000000956 alloy Substances 0.000 claims abstract description 30
- 239000000203 mixture Substances 0.000 claims abstract description 15
- 108010093096 Immobilized Enzymes Proteins 0.000 claims description 32
- 238000000034 method Methods 0.000 claims description 31
- 102000004190 Enzymes Human genes 0.000 claims description 19
- 108090000790 Enzymes Proteins 0.000 claims description 19
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 claims description 19
- 229940088598 enzyme Drugs 0.000 claims description 19
- 238000004519 manufacturing process Methods 0.000 claims description 19
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- 238000001514 detection method Methods 0.000 claims description 8
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- 229940116332 glucose oxidase Drugs 0.000 claims description 7
- 235000019420 glucose oxidase Nutrition 0.000 claims description 7
- TVWHNULVHGKJHS-UHFFFAOYSA-N Uric acid Natural products N1C(=O)NC(=O)C2NC(=O)NC21 TVWHNULVHGKJHS-UHFFFAOYSA-N 0.000 claims description 6
- 229940116269 uric acid Drugs 0.000 claims description 6
- 238000004544 sputter deposition Methods 0.000 claims description 5
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- 229940084986 human chorionic gonadotropin Drugs 0.000 claims description 3
- LJCNDNBULVLKSG-UHFFFAOYSA-N 2-aminoacetic acid;butane Chemical compound CCCC.CCCC.NCC(O)=O LJCNDNBULVLKSG-UHFFFAOYSA-N 0.000 claims description 2
- 108010025188 Alcohol oxidase Proteins 0.000 claims description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 2
- 239000001257 hydrogen Substances 0.000 claims description 2
- 229910052739 hydrogen Inorganic materials 0.000 claims description 2
- 108090000854 Oxidoreductases Proteins 0.000 claims 4
- 102000004316 Oxidoreductases Human genes 0.000 claims 4
- 108010060059 Sarcosine Oxidase Proteins 0.000 claims 1
- 102000008118 Sarcosine oxidase Human genes 0.000 claims 1
- 241000700605 Viruses Species 0.000 claims 1
- 238000000691 measurement method Methods 0.000 claims 1
- 150000004965 peroxy acids Chemical class 0.000 claims 1
- 230000002452 interceptive effect Effects 0.000 abstract description 20
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- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 description 38
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 28
- 238000005259 measurement Methods 0.000 description 24
- 230000003647 oxidation Effects 0.000 description 22
- 238000007254 oxidation reaction Methods 0.000 description 22
- 229960005070 ascorbic acid Drugs 0.000 description 18
- 235000010323 ascorbic acid Nutrition 0.000 description 18
- 239000011668 ascorbic acid Substances 0.000 description 18
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 16
- 239000008103 glucose Substances 0.000 description 16
- 229910052697 platinum Inorganic materials 0.000 description 14
- 239000000463 material Substances 0.000 description 11
- YEWLVPDHCCERJH-UHFFFAOYSA-N [Re].[Ir] Chemical compound [Re].[Ir] YEWLVPDHCCERJH-UHFFFAOYSA-N 0.000 description 10
- 239000007772 electrode material Substances 0.000 description 8
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 6
- 229940015047 chorionic gonadotropin Drugs 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- LEHOTFFKMJEONL-UHFFFAOYSA-N Uric Acid Chemical compound N1C(=O)NC(=O)C2=C1NC(=O)N2 LEHOTFFKMJEONL-UHFFFAOYSA-N 0.000 description 5
- 239000002253 acid Substances 0.000 description 5
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- 238000003487 electrochemical reaction Methods 0.000 description 3
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- 229910000510 noble metal Inorganic materials 0.000 description 3
- 102000004169 proteins and genes Human genes 0.000 description 3
- 108090000623 proteins and genes Proteins 0.000 description 3
- 239000011780 sodium chloride Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- SXRSQZLOMIGNAQ-UHFFFAOYSA-N Glutaraldehyde Chemical compound O=CCCCC=O SXRSQZLOMIGNAQ-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000011088 calibration curve Methods 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
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- 238000004528 spin coating Methods 0.000 description 2
- 230000001954 sterilising effect Effects 0.000 description 2
- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical compound CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 description 1
- KOAWAWHSMVKCON-UHFFFAOYSA-N 6-[difluoro-(6-pyridin-4-yl-[1,2,4]triazolo[4,3-b]pyridazin-3-yl)methyl]quinoline Chemical compound C=1C=C2N=CC=CC2=CC=1C(F)(F)C(N1N=2)=NN=C1C=CC=2C1=CC=NC=C1 KOAWAWHSMVKCON-UHFFFAOYSA-N 0.000 description 1
- 108010088751 Albumins Proteins 0.000 description 1
- 102000009027 Albumins Human genes 0.000 description 1
- 108091003079 Bovine Serum Albumin Proteins 0.000 description 1
- DCCUEELNWVNSHH-UHFFFAOYSA-N CC(CN)(COO)S(=O)(=O)O Chemical class CC(CN)(COO)S(=O)(=O)O DCCUEELNWVNSHH-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- ZZZCUOFIHGPKAK-UHFFFAOYSA-N D-erythro-ascorbic acid Natural products OCC1OC(=O)C(O)=C1O ZZZCUOFIHGPKAK-UHFFFAOYSA-N 0.000 description 1
- 241000183024 Populus tremula Species 0.000 description 1
- 229930003268 Vitamin C Natural products 0.000 description 1
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- 239000000872 buffer Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
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- 206010012601 diabetes mellitus Diseases 0.000 description 1
- HTXDPTMKBJXEOW-UHFFFAOYSA-N dioxoiridium Chemical compound O=[Ir]=O HTXDPTMKBJXEOW-UHFFFAOYSA-N 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- FBPFZTCFMRRESA-GUCUJZIJSA-N galactitol Chemical compound OC[C@H](O)[C@@H](O)[C@@H](O)[C@H](O)CO FBPFZTCFMRRESA-GUCUJZIJSA-N 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 229940093915 gynecological organic acid Drugs 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000003053 immunization Effects 0.000 description 1
- 238000002649 immunization Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 229910000457 iridium oxide Inorganic materials 0.000 description 1
- 150000002596 lactones Chemical class 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- MUMZUERVLWJKNR-UHFFFAOYSA-N oxoplatinum Chemical compound [Pt]=O MUMZUERVLWJKNR-UHFFFAOYSA-N 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 239000008363 phosphate buffer Substances 0.000 description 1
- 239000008055 phosphate buffer solution Substances 0.000 description 1
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- 229910003446 platinum oxide Inorganic materials 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- 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
- C12Q1/26—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving oxidoreductase
-
- 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
-
- 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
Definitions
- the present invention relates to an electrochemical measurement apparatus using an electrode for an electrochemical measurement apparatus and an electrode for an electrochemical measurement apparatus, a biosensor using an electrode for a biosensor and an electrode for a biosensor, and a bright production of an electrode for an electrochemical measurement apparatus.
- the present invention relates to a method, a method of manufacturing an electrode for a biosensor, a method of measurement using an electrochemical measurement device, and a method of measurement using a Vodaf sensor.
- the device for measuring the concentration of hydrogen peroxide in solution measures the concentration of hydrogen peroxide contained in the reducing agent used in the semiconductor manufacturing process and hydrogen peroxide contained in the sterilization and disinfectant solutions in the food manufacturing process. Therefore, it is widely used to measure hydrogen peroxide concentration in reactor water of a nuclear reactor.
- An apparatus for measuring the concentration of hydrogen peroxide in a solution is, for example, one using an electrochemical reaction.
- the electrode is immersed in a solution containing hydrogen peroxide, and a carbon electrode or a noble metal electrode such as platinum is used.
- the measurement is performed by detecting the current value obtained at the time of application.
- a measuring device for measuring the concentration of substances contained in a wide variety of solutions a measuring device combining catalytic reaction of proteins and electrochemical reaction in addition to the above-mentioned electrochemical reaction of hydrogen peroxide is widely used. There is.
- a chemical substance in the solution is converted to hydrogen peroxide by the catalytic function of the enzyme, and the converted hydrogen peroxide is measured by a redox reaction using the above electrode, or a chemical in the solution.
- Immunosensors that measure the concentration of chemical substances in solution by reacting substances (antigens) with antibodies and detecting the current generated by the reaction are widely used.
- the glucose concentration in the sample can be measured by measuring the current value generated at that time.
- a noble metal which is a material having a high level of acidity to hydrogen peroxide is used as compared with other electrode materials.
- platinum is preferable as an electrode material in Japanese Patent Application Laid-Open Nos. 2001-2006 (Patent Document 1) and 2000-1 049 (Patent Document 2). It is stated that it is required.
- platinum is expensive as an electrode material and is inferior in workability to other electrode materials, so electrode materials made of materials other than platinum may be used.
- Patent Document 3 an iridium is disclosed as one of preferable materials.
- Electrodes measure glucose concentration by measuring the current value after application to hydrogen peroxide. Disclosure of the invention:
- An electrode using such a noble metal or oxide as described above is useful as an electrode for detection of hydrogen peroxide and an electrode for an electrochemical measurement apparatus or biosensor using the same.
- the above-mentioned electrode can not be influenced by substances other than hydrogen peroxide contained in the solution. It is more desirable to use a structure and composition that can be avoided as much as possible.
- ascorbic acid also known as vitamin C
- urate acetatominophen
- the application around 0 V is also susceptible to the natural potential of the electrode material itself. For this reason, in the measurement accuracy, particularly, the measurement accuracy of the repeatability may be lowered.
- the present invention has been made in view of the above reasons, and an object thereof is to provide an electrode for an electrochemical measurement device that is less susceptible to interference substances than in the past, and an electrochemical measurement device (biosensor) using the same. It is to do.
- the first invention contains at least iridium and rhenium, and contains iridium and rhenium in such a composition as to obtain selectivity of hydrogen peroxide. It is an electrode for an electrochemical measurement device that is characterized by being made of an alloy, and that detects hydrogen peroxide in a solution.
- the second invention is characterized in that it is composed of an alloy containing at least iridium and rhenium and the weight ratio of iridium to rhenium is in the range of 9 9 ::! To 5 0: 50.
- an electrode for an electrochemical measurement device according to the first invention or the second invention, which measures the concentration of hydrogen peroxide in a solution. It is a fixed device.
- a fourth invention is characterized in that an immobilized enzyme layer and / or an immobilized antibody layer is provided on the surface of the electrode for an electrochemical measurement device according to the first invention or the second invention. It is a biosensor electrode that detects the substance to be measured in it.
- a fifth invention is a biosensor having the electrode for a biosensor according to the fourth invention, which measures the concentration of a substance to be measured in a solution.
- a sixth invention is a discharge arc method, an evaporation method, an alloy containing at least iridium and rhenium and containing iridium and rhenium in such a composition as to obtain selectivity of hydrogen peroxide.
- a method for producing an electrode for an electrochemical measurement device comprising the step of producing by any of sputtering methods, wherein hydrogen peroxide in a solution is detected.
- a seventh invention is characterized in that it comprises the step of providing an immobilized enzyme layer and / or an immobilized antibody layer on the surface of the electrode for an electrochemical measurement device according to the first invention or the second invention. It is a manufacturing method of the electrode for biosensors which detects the measurement object substance in the inside.
- An eighth invention is a measuring method characterized by measuring the concentration of hydrogen peroxide in a solution by a current detection method using the electrochemical measuring device described in the third invention.
- a ninth invention is a measuring method using the bio-sensor according to the fifth invention and measuring the concentration of a substance to be measured in a solution by a current detection method.
- an electrode for an electrochemical measurement device that is less susceptible to interference substances than in the past, and an electrochemical measurement device (biosensor) using the same.
- FIG. 1 is a schematic view showing an electrochemical measurement apparatus 3.
- FIG. 2A is a schematic view showing a biosensor 3a.
- FIG. 2B is a view showing a longitudinal cross-sectional view of the working electrode 9 a of FIG. 2A.
- FIG. 3 is a schematic view showing a biosensor 3 b.
- FIG. 4 is a cross-sectional view of the biosensor electrode 4 a of FIG. 3.
- FIG. 5 is a diagram showing the experimental results of Example 1.
- FIG. 6 is a diagram showing the experimental results of Example 2.
- FIG. 7 shows the experimental results of Example 4. Explanation of sign:
- an electrochemical measurement device for measuring the concentration of hydrogen peroxide in the solution 15 is exemplified as the electrochemical measurement device 3.
- the electrochemical measuring device 3 shown in FIG. 1 is a device that oxidizes hydrogen peroxide in the solution 15 It has an electrode 9 (electrode 1 for an electrochemical measurement apparatus), a reference electrode 5 which is an electrode serving as a reference of electric potential, and a counter electrode 7 provided as needed.
- the electrochemical measuring device 3 measures the control of oxidation current such as application of electric potential at the time of measurement and measures the hydrogen peroxide concentration by measuring the hydrogen peroxide concentration, each electrode and the measuring device 13 It has wiring 11 to connect.
- the electrochemical measuring device 3 immerses the working electrode 9, the counter electrode 7, and the reference electrode 5 in a solution 15 containing hydrogen peroxide, applies a constant potential via the measuring device 13, and the surface of the working electrode 9 It is a device that measures the concentration of hydrogen peroxide in solution 15 by measuring the value of the oxidation current obtained when hydrogen peroxide is oxidized.
- the electrochemical measurement device 3 measures the concentration of hydrogen peroxide in the solution by the current detection method.
- the working electrode 9 be a structure and a material that are less susceptible to interfering substances during measurement.
- the working electrode 9 have such a selectivity as to oxidize only hydrogen peroxide at the time of measurement.
- the inventors of the present invention have a composition which contains at least iridium and rhenium in the electrode and has selectivity of hydrogen peroxide to iridium and rhenium. We found that it is possible to make the influence of interfering substances less susceptible than before by using the contained alloy.
- Iridium is a material that has high acidity to hydrogen peroxide and is inexpensive and has excellent processability compared to gold and platinum used as materials for conventional working electrodes.
- Peroxide in solution 15 It is essential to acidify hydrogen.
- Rhenium is an element that imparts hydrogen peroxide selectivity to the electrode by being added to iridium as well as having oxidizing power for hydrogen peroxide, and is essential to make it less susceptible to interfering substances than before. It is.
- the content of rhenium in the alloy is in% by weight with respect to the content of iridium. It is desirable that the weight ratio be 1 to 50%, or the weight ratio of iridium to rhenium be in the range of 9: 1 to 5:50.
- iridium More preferably, it is 1 to 10% by weight based on the content of iridium, or the weight ratio of iridium to rhenium is preferably in the range of 9 9: 1 to 90:10.
- the alloy may be composed only of iridium and rhenium, and in this case, the weight ratio of iridium to rhenium is preferably in the range of 9 9: 1 to 5: 0. That is, the electrode may be made of an iridium-rhenium alloy and the content of rhenium may be 1 to 50% by weight.
- a more preferable ratio of iridium to lum is in the range of 9: 1 to 9: 0.
- the above-mentioned alloy is manufactured, for example, by a discharge arc method, a vapor deposition method, or a sputtering method, but is preferably manufactured by a discharge arc method in that the material can be used without waste.
- a known electrode can be used as the reference electrode 5 and, for example, a glass composite electrode can be mentioned.
- a known electrode can be used as the counter electrode 7 and, for example, a platinum electrode can be mentioned.
- the working electrode 9, the counter electrode 7, and the reference electrode 5 are immersed in a solution 15 containing hydrogen peroxide.
- Solution 15 is, for example, a reducing agent used in a semiconductor manufacturing process, a sterilizing / disinfecting solution used in food manufacturing, and reactor water of a reactor.
- Measuring device 13 measures the oxidation current, and measures the concentration of hydrogen peroxide in solution 15 based on the measured value.
- the working electrode 9 uses an alloy containing iridium and rhenium in the electrode and containing iridium and rhenium in such a composition that the selectivity of hydrogen peroxide can be obtained. It is done.
- the solution 15 contains interfering substances such as uric acid, ascorbic acid, and other organic acids, oxidation of the interfering substances on the surface of the working electrode 9 can be suppressed more than before, and oxidation of the interfering substances can be prevented. Can prevent the current output from occurring and lowering the measurement accuracy.
- interfering substances such as uric acid, ascorbic acid, and other organic acids
- the measurement accuracy of the concentration of hydrogen peroxide in the solution 15 can be improved more than before.
- the electrochemical measurement device 3 has a working electrode 9, a counter electrode, a reference electrode 5, and a measurement device 13, and the working electrode 9 includes iridium and renium. And, an alloy containing iridium and rhenium in such a composition as to obtain selectivity of hydrogen peroxide is used.
- the oxidation of the interfering substance on the surface of the working electrode 9 can be suppressed more than before, and the current output is generated by the oxidizing of the interfering substance to reduce the measurement accuracy. You can prevent that.
- the working electrode 9 is less susceptible to interfering substances than ever before.
- the working electrode 9 a is a biosensor electrode 4 whose surface is covered with the immobilized enzyme layer 6, and the entire device is a biosensor 3 a. .
- the configuration of the bio-sensor 3a is the same as that of the electrochemical measuring device 3, but the substance to be measured in the solution 15a is converted to hydrogen peroxide, and the obtained hydrogen peroxide is obtained. It has a working electrode 9 a (biosensor electrode 4) that oxidizes Further, the biosensor 3a measures the concentration of the substance to be measured from the measured hydrogen peroxide concentration by performing control such as application of a potential at the time of measurement and measuring oxidation current. It has an apparatus 13a. As shown in FIG. 2B, the biosensor electrode 4 is provided on the surface of the electrode 1 for electrochemical measurement device and the electrode 1 for electrochemical measurement device, and is an immobilized enzyme layer that converts a substance to be measured into hydrogen peroxide. It has 6 (or an immobilized antibody layer).
- the structure and composition of the electrode 1 for an electrochemical measurement device are the same as those of the electrode 1 for an electrochemical measurement device according to the first embodiment, and contain iridium and rhenium, and iridium and rhenium, hydrogen peroxide
- An alloy is used that has a composition that provides the selectivity of
- the immobilized enzyme layer 6 is a layer containing an enzyme that converts a substance to be measured into hydrogen peroxide.
- the biosensor 3 a is an oxidation current generated when the enzyme of the immobilized enzyme layer 6 converts the substance to be measured into hydrogen peroxide and the obtained hydrogen peroxide is oxidized on the surface of the electrode 1 for an electrochemical measurement device. By measuring, it is possible to measure the concentration of the substance to be measured in solution 15 a.
- the biosensor 3a can measure the concentration of the substance to be measured in the solution by measuring the concentration of hydrogen peroxide in the solution by the current detection method.
- the enzyme needs to be an enzyme that produces hydrogen peroxide as a product of the catalytic reaction of the substance to be measured or consumes oxygen, and depending on the substance to be measured, lactate oxidase, glucose oxidase, uric acid oxidation Enzymes, urea oxidase, alcohol oxidase, etc. are used.
- kidney cells two or more types of enzymes may be used simultaneously.
- creatininase, creatinase, and sarcosyltransferases fall under this.
- it may contain an enzyme and a capture enzyme.
- a solution containing an enzyme solution, a cross-linking agent for proteins such as dartalaldehyde, and albumin is dropped onto the surface of the electrode 1 for an electrochemical measurement device, and the surface of the electrode 1 for an electrochemical measurement device is The enzyme is immobilized to form an immobilized enzyme layer 6.
- the immobilized enzyme layer 6 is not particularly limited as long as it has a function of converting a substance to be measured into hydrogen peroxide at least including an enzyme.
- an immobilized antibody layer is used instead of the immobilized enzyme layer 6, an antibody such as a chorionic gonadotropin antibody is used as the antibody according to the substance to be measured.
- the electrode 1 for electrochemical measurement for example, after immersing the electrode 1 for electrochemical measurement in a solution containing the antibody for a certain period of time, the electrode is swept in a phosphate buffer solution containing sodium chloride. Fix the antibody to form an immobilized antibody layer.
- the biosensor 3a functions as an immunosensor.
- the working electrode 9a, the counter electrode 7, and the reference electrode 5 are immersed in a solution 15a containing the substance to be measured.
- the solution 15 a is, for example, the urine of a diabetic patient when the substance to be measured is glucose, and in the case of chorionic gonadotropin, the urine of a woman who may be pregnant.
- a constant potential is applied through the measuring device 13a.
- the biosensor 3a is an enzyme sensor using the immobilized enzyme layer 6
- the substance to be measured in the solution 15a is the working electrode 9a.
- the hydrogen peroxide thus obtained is oxidized on the surface of the electrode 1 for an electrochemical measurement device of the working electrode 9 a by the application of a potential to generate an oxidation current.
- the measuring device 13 a measures the oxidation current and measures the hydrogen peroxide concentration based on the measured oxidation current.
- the measuring device 13 a measures the concentration of the substance to be measured in the solution 15 a.
- the biosensor 3a is an immunosensor
- the antibodies react with the substance to be measured when each electrode is immersed in the solution 15a, so square wave voltammetry through the measuring device 13a. Measure the current value obtained by the reaction, and based on the current value, Measure the concentration of the substance to be measured in solution 15 a.
- the electrode 1 for the electrochemical measurement device of the working electrode 9 a contains iridium and rhenium in the electrode, and a composition such that selectivity of hydrogen peroxide is obtained between iridium and rhenium
- the alloy contained is used to be Therefore, even if the solution 15 a contains an interfering substance such as ascorbic acid or acetoaminophen, the oxidation of the interfering substance on the surface of the electrode 1 for electrochemical measurement apparatus can be suppressed more than before, and the interfering substance Oxidation prevents the current output from occurring and lowering the measurement accuracy.
- the biosensor 3 a includes the working electrode 9 a, the counter electrode 7, the reference electrode 5, and the measuring device 13 a, and the electrochemical measuring device for the working electrode 9 a
- the electrode 1 is made of an alloy containing iridium and rhenium, and the above-mentioned alloy has a composition such that the selectivity of hydrogen peroxide can be obtained.
- the biosensor 3 b includes the electrode 1 for an electrochemical measurement device on the insulating substrate 23, and the electrode 1 for an electrochemical measurement device and the immobilized enzyme layer 6.
- a bonding layer 24 is further provided between them to form a working electrode 25a (electrode for biosensor 4a).
- the working electrode 25a (biosensor electrode 4a) has an insulating substrate 23 and an electrode 1 for electrochemical measurement device provided on the surface of the insulating substrate 23 There is.
- the working electrode 25 a (biosensor electrode 4 a) is an immobilized enzyme layer 6 (or immobilized antibody layer) above the electrode 1 for electrochemical measurement device in FIG. Is provided.
- the working electrode 25 a is provided between the electrode 1 for electrochemical measurement device and the immobilized enzyme layer 6, and the insulating substrate 23 and the electrochemical chemistry so as to cover the electrode 1 for electrochemical measurement device. It has a bonding layer 24 provided on the measuring device electrode 1.
- An immobilized enzyme layer 6 is provided on the binding layer 24.
- the electrode 1 for the electrochemical measurement device, the immobilized enzyme layer 6, and the binding layer 24 constitute an electrode unit 10.
- the insulating substrate 23 is a member for holding the electrode portion 10, and is preferably a material excellent in water resistance, heat resistance, chemical resistance, insulation, and adhesion with the electrode 1 for an electrochemical measuring apparatus. Yes.
- Examples of materials that satisfy such requirements include ceramics, glass, quartz and plastics.
- the bonding layer 24 is provided to improve the adhesion (bonding property) between the immobilized enzyme layer 6 and the insulating substrate 23 and the electrode 1 for an electrochemical measurement device.
- the bonding layer 24 also has the effect of improving the wettability of the surface of the insulating substrate 23 and improving the uniformity of the film thickness when forming the immobilized enzyme layer 6. .
- Examples of the material constituting the bonding layer 24 include a silane coupling agent.
- silane coupling agent examples include aminosilane, vinylsilane and epoxysilane. Among them, ⁇ -aminopropyltriethoxysilane, which is a type of aminosilane, is more preferable from the viewpoint of adhesion.
- the bonding layer 24 can be formed on the insulating substrate 23 and the electrode 1 for an electrochemical measurement device, for example, by spin coating with a silane coupling agent solution.
- the concentration of the silane coupling agent is preferably about 1 ⁇ % (% (volume ⁇ volume / 0 ). At this concentration, the alkoxyl group is sufficiently hydrated and sufficient adhesion is exhibited.
- Electrode portion 10 is provided on one insulating substrate 23 in FIG. 4, a plurality of electrode portions 10 may be provided on one insulating substrate 23.
- the counter electrode 7 and the reference electrode 5 are also formed on separate insulating substrates 23 in FIG. 3, all the electrodes may be formed on one insulating substrate 23.
- the electrode 1 for an electrochemical measurement device is provided on the insulating substrate 23 by using a vapor deposition method, sputtering method or the like.
- the electrochemical measurement device A bonding layer 24 is provided by spin coating so as to cover the electrode 1.
- a solution containing an enzyme solution, a protein crosslinking agent such as glutaraldehyde, and alpmin is dropped on the binding layer 24 to form an immobilized enzyme layer 6, thereby completing the working electrode 25a.
- the method of measuring the concentration of the substance to be measured in the solution 15 a using the biosensor 3 b is the same as in the second embodiment, and thus the description thereof is omitted.
- the piezo sensor 3 b has a working electrode 25 a, a counter electrode 7, a reference electrode 5, and a measuring device 1 3 a, and for electrochemical measuring devices of the working electrode 25 a
- the electrode 1 is made of an alloy containing iridium and rhenium, and the above-mentioned alloy has such a composition that the selectivity of hydrogen peroxide can be obtained.
- the working electrode 25 a is provided with the electrode 1 for electrochemical measurement device on the insulating substrate 23, and is bonded between the electrode 1 for electrochemical measurement device and the immobilized enzyme layer 6. It has a structure in which a layer 24 is further provided.
- the adhesion (binding) between the immobilized enzyme layer 6 and the electrode 1 for an electrochemical measurement device can be improved, and the immobilized enzyme layer 6 is formed.
- the uniformity of the film thickness can be improved.
- the electrochemical measurement device 3 shown in FIG. 1 was prepared, and the current ratio of hydrogen peroxide to ascorbic acid, which is one of interfering substances, was calculated by constant potential measurement in a solution containing hydrogen peroxide and interfering substances. The selectivity of hydrogen peroxide in working electrode 9 was evaluated.
- Electrode 1 for electrochemical measurement apparatus
- production of the working electrode 9 was performed as follows. First, iridium wire and rhenium wire were prepared, and an arc discharge produced an iridium-rhenium alloy.
- the weight ratio of iridium to rhenium is six types of 100: 0, 9 9: 1, 90: 10, 5 5: 45, 10: 90, 0: 100. Made things. Next, the manufactured iridium-rhenium alloy is fixed to a flexible substrate on which printed wiring is applied using an adhesive, wire bonding is performed, and then waterproofing is performed with a silicone sealant, and a working electrode 9 is obtained. (Electrode 1).
- an existing glass composite electrode (GST-5741 C, manufactured by Toago Dikeke Co., Ltd.) was prepared as the reference electrode 5
- an existing platinum electrode (002233, manufactured by BAS) was prepared as the counter electrode 7.
- the response current was measured when 0.5 V, 0.7 V and 0.9 V were applied.
- the response current is selected selectively especially to hydrogen peroxide. It turned out to show.
- Example 1 the evaluation of uric acid and acetatominophen as interfering substances was performed in the same manner as in Example 1 under the same conditions except that the applied potential at the time of evaluation was only 0.7 V.
- the weight ratio of iridium to rhenium is 9 9: 1, 9 for both uric acid and acetoaminophen as well as for ascorbic acid.
- 0: 10, 5: 45 it was found that the acid repulsion was small and that hydrogen peroxide was selectively oxidized.
- the biosensor 3a shown in FIG. 2 is manufactured as a biosensor for glucose measurement, and the concentration of glucose in a solution 15a containing ascorbic acid and glucose whose concentration is known is measured, and the working electrode 25a is Evaluation of selectivity to hydrogen peroxide was performed.
- an electrode 1 for an electrochemical measurement apparatus of an iridium-rhenium alloy was produced in the same manner as in Example 1 so that the weight ratio of iridium to rhenium was 90:10.
- bovine serum albumin solution (1 V / V% glutaraldehyde and 5 6.5 UX 10) adjusted to 2 2.5 w Zv% with 100 mol / m 3 (100 mM) TES. — 6 _ litore (containing 6. 5 6./ ⁇ 1) of glucose oxidase is applied in the same manner, and dried in a refrigerator at 2.5 ⁇ 1 ° C for 24 hours to obtain a working electrode 9 a (for biosensor) An electrode 4 a) was produced.
- a reference electrode 5 and a counter electrode 7 were also prepared, and these electrodes were immersed in the solution 15 a, and these electrodes were connected to the measuring device 13 a through the wiring 11 to produce a biosensor 3 a. .
- an electrode for a biosensor using an electrode using platinum instead of a iridium-rhenium alloy as a working electrode was prepared, and a biosensor using this was prepared.
- the measurement was repeated three times at 0.9 V constant potential measurement.
- the biosensor 3a of this example using the iridium murenium alloy was able to measure the almost accurate concentration of darcose, but the biosensor of the comparative example using a platinum electrode did not show the interference due to the oxidation current of ascorbic acid. As a result, it was not possible to measure the correct glucose concentration.
- the biosensor 3a used in Example 3 was prepared.
- Each electrode of the biosensor 3 a was immersed in TE S solution at room temperature, 1 0X 10 every predetermined number of days - 5 kg / glucose and 1 X 10 _ 5 kg of Li Tsu Bok Honoré (1 Omg / d 1) Ascorbic acid was measured to evaluate the stability of the electrode. The evaluation was performed by calculating the ratio of the current value of ascorbic acid to the current value of hydrogen peroxide when 0.9 V was applied. The results are shown in Figure 7.
- P t in the graph in FIG. 7 is a measured value of a biosensor (comparative example) using a platinum electrode
- I r -Re is a biosensor 3 a (an iridium-rhenium alloy electrode). It is a measured value of the present Example.
- biosensors using platinum electrodes show higher current for ascorbic acid than hydrogen peroxide, and the current ratio is 5.5-6. 1 (askorubic acid hydrogen peroxide) And was stable for 27 days.
- biosensor 3a using an iridium murenium alloy electrode shows an electric current selectively to hydrogen peroxide generated from darcosis, and almost shows an electric current to ascorbic acid. It was not.
- the current ratio was 0. 06-0. 1 (ascorbic acid and hydrogen peroxide) and was stable with almost no fluctuation for 27 weeks.
- Example 3 an immunosensor using a working electrode provided with an immobilized antibody layer instead of the immobilized enzyme layer 6 is prepared, and it is prepared in a solution containing ascorbic acid and chorionic gonadoto bottle whose concentration is known. The concentration of flagellar gonadotrophin was measured to evaluate the selectivity of the working electrode to hydrogen peroxide.
- the working electrode was manufactured as follows.
- Example 1 an electrode 1 for an electrochemical measurement apparatus was prepared so that the weight ratio of iridium to laser was 90:10.
- the electrode 1 for an electrochemical measurement apparatus manufactured to a solution of 1 X 10- 3 kg / 0. 2 Rittonore (1 mg / 0. 2 ml) human chorionic gonadotropin antibody (Haitesutone earth manufactured by mouse immunization with monoclonal antibodies) of 1 Soaked for a while.
- the immunosensor of this example using an iridium-rhenium alloy for the working electrode showed almost exactly the concentration of chorionic gonadotropin, but the immunosensor of the comparative example using a platinum electrode is associated with the oxidation current of askorubinic acid. Due to interference, accurate concentration could not be measured.
- the electrode 1 for an electrochemical measurement device of the present example can eliminate the influence of interfering substances even when used as an immunosensor.
- the biosensor 3a and the immunosensor are mainly applied to a sensor for measuring the concentration of glucose and chorionic gonadotropin in solution
- the present invention is not limited thereto, and the catalytic reaction can be used to measure the concentration of all substances that can be converted to hydrogen peroxide.
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US12/741,158 US8568578B2 (en) | 2007-11-07 | 2008-10-29 | Electrode for electrochemical measurement apparatus and electrode for biosensor |
JP2009540070A JP5061375B2 (ja) | 2007-11-07 | 2008-10-29 | 電気化学測定装置用電極およびバイオセンサ用電極 |
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CN110487861A (zh) * | 2019-08-02 | 2019-11-22 | 重庆东渝中能实业有限公司 | 一种集成一体化维生素检测电极及配套清洗的装置 |
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EP3311150A1 (en) | 2015-06-18 | 2018-04-25 | Ultradian Diagnostics LLC | Methods and devices for determining metabolic states |
CN115266868A (zh) * | 2022-08-22 | 2022-11-01 | 苏州大学 | 一种基于金属氧化物的特异性电化学传感器及其构建方法与应用 |
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JPH01153952A (ja) * | 1987-12-11 | 1989-06-16 | Terumo Corp | 酵素センサ |
JPH08240562A (ja) * | 1995-03-03 | 1996-09-17 | Hitachi Ltd | 炉水用過酸化水素センサ |
JPH09127053A (ja) * | 1995-10-30 | 1997-05-16 | Kdk Corp | 過酸化水素の測定方法、その方法を用いた過酸化水素測定センサーおよびその製造方法 |
JP2003121407A (ja) * | 2001-10-12 | 2003-04-23 | Nippon Telegr & Teleph Corp <Ntt> | ナノ金属微粒子含有炭素薄膜電極及びその製造方法 |
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US2802894A (en) * | 1955-04-30 | 1957-08-13 | Degussa | Thermocouple |
US5922183A (en) * | 1997-06-23 | 1999-07-13 | Eic Laboratories, Inc. | Metal oxide matrix biosensors |
JP3214561B2 (ja) | 1998-07-02 | 2001-10-02 | 日本電気株式会社 | 酵素電極およびそれを用いたバイオセンサ、測定器 |
US6767440B1 (en) | 2001-04-24 | 2004-07-27 | Roche Diagnostics Corporation | Biosensor |
JP3365497B2 (ja) | 1999-10-19 | 2003-01-14 | 日本電気株式会社 | 過酸化水素電極およびそれを用いた過酸化水素センサ、測定器 |
DE10027651C2 (de) * | 2000-06-03 | 2002-11-28 | Bosch Gmbh Robert | Elektrode, Verfahren zu deren Herstellung und Zündkerze mit einer derartigen Elektrode |
US20070056852A1 (en) * | 2004-07-23 | 2007-03-15 | Canon Kabushiki Kaisha | Enzyme electrode sensor fuel cell and electrochemical reactor |
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2008
- 2008-10-29 WO PCT/JP2008/070156 patent/WO2009060878A1/ja active Application Filing
- 2008-10-29 US US12/741,158 patent/US8568578B2/en not_active Expired - Fee Related
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Patent Citations (4)
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JPH01153952A (ja) * | 1987-12-11 | 1989-06-16 | Terumo Corp | 酵素センサ |
JPH08240562A (ja) * | 1995-03-03 | 1996-09-17 | Hitachi Ltd | 炉水用過酸化水素センサ |
JPH09127053A (ja) * | 1995-10-30 | 1997-05-16 | Kdk Corp | 過酸化水素の測定方法、その方法を用いた過酸化水素測定センサーおよびその製造方法 |
JP2003121407A (ja) * | 2001-10-12 | 2003-04-23 | Nippon Telegr & Teleph Corp <Ntt> | ナノ金属微粒子含有炭素薄膜電極及びその製造方法 |
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Publication number | Priority date | Publication date | Assignee | Title |
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CN110487861A (zh) * | 2019-08-02 | 2019-11-22 | 重庆东渝中能实业有限公司 | 一种集成一体化维生素检测电极及配套清洗的装置 |
CN110487861B (zh) * | 2019-08-02 | 2024-04-02 | 重庆东渝中能实业有限公司 | 一种集成一体化维生素检测电极及配套清洗的装置 |
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US20100258452A1 (en) | 2010-10-14 |
JPWO2009060878A1 (ja) | 2011-03-24 |
US8568578B2 (en) | 2013-10-29 |
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