JP5456885B2 - バイオセンサー及びその使用方法 - Google Patents
バイオセンサー及びその使用方法 Download PDFInfo
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- JP5456885B2 JP5456885B2 JP2012511137A JP2012511137A JP5456885B2 JP 5456885 B2 JP5456885 B2 JP 5456885B2 JP 2012511137 A JP2012511137 A JP 2012511137A JP 2012511137 A JP2012511137 A JP 2012511137A JP 5456885 B2 JP5456885 B2 JP 5456885B2
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
- G01N33/543—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals
- G01N33/54366—Apparatus specially adapted for solid-phase testing
- G01N33/54373—Apparatus specially adapted for solid-phase testing involving physiochemical end-point determination, e.g. wave-guides, FETS, gratings
- G01N33/5438—Electrodes
-
- 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
-
- 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
Description
(実施例1)
グルコース濃度が異なる試料の添加量が充分であるかどうかを判定する検証実験
グルコース濃度がぞれぞれ60mg/dl、120mg/dl、280mg/dl、500mg/dlである血液を、本発明のバイオセンサーに入れて測定を行った。そこで、濃度毎に、測定の要求を満たす血液量と、測定の要求を満たさない血液量とを、それぞれ10組用意して、バイオセンサーに入れた。それらの結果を表1〜4及び図6〜9に示す。これらの結果から分かるように、試料量が充分である場合、5.0秒時の第1電流値と、5.1秒時の第2電流値との偏差が小さく、その偏差率がいずれも5%よりも小さい。5.0秒と5.1秒との間の曲線にはほとんど変化がない。しかし、試料量が測定の要求を満たさないと、5.0秒時の第1電流値と5.1秒時の第2電流値との偏差が大きく、その偏差率の絶対値が30%よりも大きいか、或いは無限大である。5.0秒と5.1秒との間の曲線には、一つの峰が明らかに現れている。この実験結果から分かるように、本発明のバイオセンサーにより第1電流値及び第2電流値を測定し、第1電流値と第2電流値とを比較することによって、添加量が充分であるかどうかを確実に判定でき、且つ試料におけるグルコース濃度に関係なく、安定性が優れている。
(実施例2)
循環測定方法によりグルコース濃度が異なる試料の添加量が充分であるかどうかを判定する検証実験
グルコース濃度がそれぞれ110mg/dl、380mg/dlである血液を本発明のバイオセンサーに入れて測定を行った。その結果を図5及び図10に示す。1.0秒時の第1電流値と1.1秒時の第2電流値、3.0秒時の第1電流値と3.1秒時の第2電流値、5.0秒時の第1電流値と5.1秒時の第2電流値をそれぞれ比較した。添加量が充分であるかどうかを判定するパラメータを10%にした。第1電流値と第2電流値との間の偏差率の絶対値が10%よりも小さい場合、添加量が充分であると判定し、その逆である場合、添加量が不足であると判定する。実験結果から分かるように、充分量の試料を入れた場合、所定時間内の測定時間点で偏差率の絶対値が10%よりも小さい。所定時間内の測定時間点で測定された電流値の偏差率の絶対値が所定のパラメータよりも大きい場合は、添加量が不足であることを示す。
(実施例3)
本発明のバイオセンサーにより血液におけるグルコースの含有量を測定した測定結果
血糖測定器(例えば、ACON株式会社製のON CALLTM、血糖測定器)をオンにして、測定状態にした。本発明にかかるバイオセンサーを測定機器に挿入し、グルコース濃度が異なる血液を測定した。測定結果を表6及び図11に示す。
Claims (13)
- 絶縁基板と、一つの反応試薬層と、一つの被覆層と、試料入口とを含むバイオセンサーであって、絶縁基板の一面に電極システムが設けられ、当該電極システムは少なくとも一つの作用電極と、一つの対電極と、一つの第3電極とを含み、被覆層は、電極システムの上に被覆され、基板との間に所定の隙間を有することにより、前記試料入口を形成し、前記電極システムには電子測定システムが接続され、反応試薬層は少なくとも作用電極を被覆するバイオセンサーにおいて、
測定される試料の量が充分であるかどうかを判定するための第3電極は、対電極よりも試料入口に近接しており、前記作用電極は、対電極と第3電極との間に位置し、前記電子測定システムは、作用電極と対電極との間に電圧を印加して作用電極と対電極との間の第1電学パラメータを測定するとともに、作用電極と第3電極との間に電圧を印加して作用電極 と第3電極との間の第2電学パラメータを測定し、前記第1電学パラメータと第2電学パラメータとの関係を算出して所定値と比較することにより、試料の添加量が測定の用量を満たすかどうかを判定する
ことを特徴とするバイオセンサー。 - 被覆層は、転圧、或いは粘着剤による粘着によって、基板の、電極システムが設けられた面に付着されていることを特徴とする請求項1に記載のバイオセンサー。
- 被覆層は、少なくとも内表面が親水性材料で形成されることを特徴とする請求項1に記載のバイオセンサー。
- 反応試薬層は、酸化還元酵素と、電子伝達担体とを含むことを特徴とする請求項1に記載のバイオセンサー。
- 試料用量が充分であるかどうかを判定する方法において、
絶縁基板と、一つの反応試薬層と、一つの被覆層と、試料入口とを含むバイオセンサーであって、絶縁基板の一面に電極システムが設けられ、当該電極システムは少なくとも一つの作用電極と、一つの対電極と、測定される試料の量が充分であるかどうかを判定するための一つの第3電極とを含み、被覆層は、電極システムの上に被覆され、基板との間に所定の隙間を有することにより、前記試料入口を形成し、反応試薬層は少なくとも作用電極を被覆し、第3電極は、対電極よりも試料入口に近接しており、前記作用電極は、対電極と第3電極との間に位置するバイオセンサーを提供することと、
液体試料を前記バイオセンサーに入れることと、
作用電極と対電極との間に電圧を印加して作用電極と対電極との間の第1電学パラメータを測定することと、
作用電極と対電極とを遮断することと、
作用電極と第3電極との間に電圧を印加して作用電極 と第3電極との間の第2電学パラメータを測定することと、
前記第1電学パラメータと第2電学パラメータとの関係を算出して所定値と比較することにより、試料の添加量が測定の用量を満たすかどうかを判定することと
を含むことを特徴とする方法。 - 試料用量が充分であるかどうかを判定する方法において、
絶縁基板と、一つの反応試薬層と、一つの被覆層と、試料入口とを含むバイオセンサーであって、絶縁基板の一面に電極システムが設けられ、当該電極システムは少なくとも一つの作用電極と、一つの対電極と、測定される試料の量が充分であるかどうかを判定するための一つの第3電極とを含み、被覆層は、電極システムの上に被覆され、基板との間に所定の隙間を有することにより、前記試料入口を形成し、反応試薬層は少なくとも作用電極を被覆し、第3電極は、対電極よりも試料入口に近接しており、前記作用電極は、対電極と第3電極との間に位置するバイオセンサーを提供することと、
液体試料を前記バイオセンサーに入れることと、
作用電極と第3電極との間に電圧を印加して作用電極と第3電極との間の第2電学パラメータを測定することと、
作用電極と第3電極とを遮断することと、
作用電極と対電極との間に電圧を印加して作用電極と対電極との間の第1電学パラメータを測定することと、
前記第1電学パラメータと第2電学パラメータとの関係を算出して所定値と比較することにより、試料の添加量が測定の用量を満たすかどうかを判定することと
を含むことを特徴とする方法。 - 前記電学パラメータは、電流値であることを特徴とする請求項5又は6に記載の試料用量が充分であるかどうかを判定する方法。
- 第1電流値と第2電流値との間の差の絶対値を算出して、前記絶対値と所定値とを比較し、
前記絶対値が所定値よりも大きい場合には、試料の添加量が測定の要求を満たしていないと判定し、
前記絶対値が所定値以下である場合には、試料の添加量が測定の要求を満たしていると判定することを特徴とする請求項7に記載の方法。 - 第1電流値と第2電流値との間の偏差率の絶対値を算出して、前記偏差率と所定値とを比較し、
前記偏差率が所定値よりも大きい場合には、試料の添加量が測定の要求を満たしていないと判定し、
前記偏差率が所定値以下である場合には、試料の添加量が測定の要求を満たしていると判定することを特徴とする請求項7に記載の方法。 - 前記第1測定電学パラメータと第2測定電学パラメータとの測定タイミングの間隔は、1秒よりも短いことを特徴とする請求項5又は6に記載の方法。
- 前記測定タイミングの間隔は、0.1秒であることを特徴とする請求項10に記載の試
料用量判定方法。 - 所定時間内で、第1電学パラメータと第2電学パラメータとの測定及び比較を繰り返して行うことを特徴とする請求項5又は6に記載の方法。
- 前記電学パラメータは、電流値であり、
所定時間内で、第1電流値と第2電流値との対比関係が、添加量が充分であると判断する所定関係を満たさない場合には、試料量が不足である情報を出力し、
所定時間内で、第1電流値と第2電流値との対比関係が、添加量が充分であると判断する所定関係を満たしている場合には、両電流値の対比を停止し、試料量が充分である情報を出力することを特徴とする請求項12に記載の方法。
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