JP5933668B2 - 生体試料内の分析対象物質の濃度測定方法および測定装置 - Google Patents
生体試料内の分析対象物質の濃度測定方法および測定装置 Download PDFInfo
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Description
前記分析対象物質の酸化還元反応を開示し電子伝達反応を進行させることができるように、前記作動電極に一定の直流電圧を印加して第1感応電流を得る段階と、
前記一定の直流電圧を印加後、Λ状の階段化されたはしご形摂動電圧を印加して第2感応電流を得る段階と、
前記第1感応電流または前記第2感応電流から、2視点以上の特徴点から予め定められたフィーチャー(feature)を計算する段階と、
前記生体物質内の妨害物質の影響が減少する、少なくとも1以上のフィーチャー(feature)関数で構成された検定式を用いて、分析対象物質の濃度を計算する段階とを含む。
前記分析対象物質の酸化還元反応を触媒可能な酸化還元酵素と電子伝達媒体が固定されており、作動電極および補助電極を備えた試料セルが挿入されるコネクタと、
前記分析対象物質の酸化還元反応を開示し電子伝達反応を進行させるための一定の直流電圧と、前記一定の直流電圧に続いて、前記試料セルの電位を揺動させるための、Λ状の階段化されたはしご形摂動電圧を印加するためのデジタル−アナログコンバータ回路と、
前記デジタル−アナログコンバータ回路を制御し、前記Λ状の階段化されたはしご形摂動電圧を用いて、検定式から直接前記分析対象物質の濃度値を求めるマイクロコントローラとを含む。
2)階段化されたはしご形において各階段の感応電流からなる曲線の曲率
3)階段化されたはしご形の山での電流値と谷での電流値との差
4)上りと下りとの中間の階段化されたはしご形での感応電流
5)各階段化されたはしご形サイクルの開始および終了地点での感応電流
6)階段化されたはしご形波から得られた感応電流の平均値
7)前記1〜6のフィーチャーから得られた電流値を、四則演算、指数、ログ、三角関数などの数学的関数で表現して得ることのできる値
このように、前記摂動電圧の印加される区間に対応する第2感応電流から特徴点を探したり、これらの特徴点から得られた電流値をフィーチャー(feature)として作り、これを線形に結合して多変数回帰分析(multivariable regressionan alysis)を適用すれば、赤血球容積率による影響を最小化した検定式を得ることができる。
本発明の第1実施例による生体試料内の分析対象物質の濃度測定方法に用いられた電気化学的バイオセンサの試料セルは、スクリーン印刷された2つの炭素電極からなる使い捨てストリップであり、前記電極にグルコース脱水素化酵素および電子伝達媒体(thionine、ruthenium hexamine chloride)が塗布されている。
Glucose=slope*it=5sec(5秒での電流値)+intercept
本発明の好ましい第1実施例による生体試料内の分析対象物質の濃度測定方法に用いられたストリップ10と測定装置100を用いて、赤血球容積率の影響を最小化した検定式を求めることができる。
f1=i at 5sec(一定電圧での感応電流)
f2=i at 5.4925sec(6番目の階段化されたはしご形の上る階段における1地点での感応電流)
f3=i at 5.4425sec(5番目の階段化されたはしご形の下る階段における1地点での感応電流)
f4=curvature(5番目の階段化されたはしご形の下る階段の感応電流からなる曲率)
f5=f1 2
f6=f2 2
f7=f3 2
f8=f4 2
f9=1/f1
f10=1/f2
f11=1/f3
f12=1/f4
本発明の好ましい第2実施例による生体試料内の分析対象物質の濃度測定方法に用いられたストリップと測定装置を用いて、温度および赤血球容積率の影響を最小化した検定式を求めることができる。
f1=i at 5sec(一定電圧での感応電流)
f2=i at 5.2675sec(2番目の階段化されたはしご形の山から下る地点に位置した感応電流)
f3=i at 5.3675sec(3番目の階段化されたはしご形の谷から上る地点に位置した感応電流)
f4=curvature(2番目の階段化されたはしご形の下る階段の感応電流からなる曲率)
f5=Peak−to−Peak(2番目の階段化されたはしご形の山と谷電圧との差)
f6=f1 2
f7=f2 2
f8=f3 2
f9=f4 2
f10=f5 2
f11=1/f1
f12=1/f4
f13=T
f14=T2
f15=f1*T
本発明の好ましい第4実施例による生体試料内の分析対象物質の濃度測定方法において、電気化学的バイオセンサ10の試料セルは、スクリーン印刷された2つの炭素電極からなる使い捨てストリップであり、電極にケトン体脱水素化酵素および電子伝達媒体(1−methoxy−5−methylphenazinium methyl sulfate、ruthenium hexamine chloride)が塗布されている場合、23℃で一定電圧を印加して感応電流を得て、ケトン体の濃度を計算する場合である。
Ketone Body=slope*it=10sec(10秒での電流値)+intercept
本発明の好ましい第4実施例による生体試料内の分析対象物質の濃度測定方法に用いられたストリップと測定装置を用いて、一定電圧と摂動電圧を印加した後の特徴点から抽出したフィーチャー(feature)を用いた、ケトン体測定のための検定式を求めることができる。
f1=current at 10sec(一定電圧での感応電流)
f2=current at 8.12sec(一定電圧の初期の感応電流)
f3=current at 10.27sec(3番目の階段化されたはしご形の谷付近電圧での感応電流)
f4=current at 10.4925sec(5番目の階段化されたはしご形の谷付近電圧での感応電流)
f5=curvature(5番目の階段化されたはしご形の下る階段の感応電流からなる曲率)
f6=f1 2
f7=f2 2
f8=f3 2
f9=f4 2
f10=f5 2
f11=1/f1
f12=1/f5
100:測定装置
110:コネクタ
120:電流−電圧変換器
130:DAC
140:ADC
150:マイクロコントローラ
Claims (15)
- 生体試料内の分析対象物質の濃度測定方法において、
前記分析対象物質の酸化還元反応を触媒可能な酸化還元酵素と電子伝達媒体が固定されており、作動電極および補助電極を備えた試料セルに液状の生体試料を注入する段階と、
前記分析対象物質の酸化還元反応を開示し電子伝達反応を進行させることができるように、前記作動電極に一定の直流電圧を印加して第1感応電流を得る段階と、
前記一定の直流電圧を印加後、Λ状の階段化されたはしご形摂動電圧を印加して第2感応電流を得る段階と、
前記第1感応電流または前記第2感応電流から、2視点以上の特徴点から予め定められたフィーチャー(feature)を計算する段階と、
前記生体試料内の少なくとも1以上の妨害物質の影響が最小となるように、少なくとも1以上のフィーチャー(feature)関数で構成された検定式を用いて、前記分析対象物質の濃度を計算する段階とを含むことを特徴とする、生体試料内の分析対象物質の濃度測定方法。 - 前記Λ状の階段化されたはしご形摂動電圧の特徴は、各階段の高さ(Vstep)、各階段の印加時間(tstep)、全体変化範囲における中間電圧と一定電圧との差(Vcenter)、中間電圧と山電圧値との差(Vpeak)、全体の階段化されたはしご形波の山電圧値と隣接する次の階段化されたはしご形波の山電圧値との時間差(tcycle)からなることを特徴とする、請求項1に記載の生体試料内の分析対象物質の濃度測定方法。
- 前記第2感応電流は、第1感応電流を得た後、0.1〜1秒以内に得られることを特徴とする、請求項1に記載の生体試料内の分析対象物質の濃度測定方法。
- 前記一定の直流電圧と前記Λ状の階段化されたはしご形摂動電圧は、マイクロコントローラに連動する同一のデジタル−アナログコンバータ回路を介して前記作動電極に印加されるように構成されることを特徴とする、請求項1に記載の生体試料内の分析対象物質の濃度測定方法。
- 前記第1または第2感応電流から前記分析対象物質と妨害物質に対する線形依存性が異なる特徴点を選択し、前記特徴点でフィーチャーを構成し、前記フィーチャーで構成した検定式を作ることを特徴とする、請求項1に記載の生体試料内の分析対象物質の濃度測定方法。
- 前記特徴点で前記フィーチャーを作る方法は、特定の階段化されたはしご形の山および谷電圧付近の第2感応電流、前記階段化されたはしご形摂動電圧において各階段の感応電流からなる曲線の曲率、前記階段化されたはしご形摂動電圧の山での電流値と谷での電流値との差、上りと下りとの中間の階段化されたはしご形摂動電圧での感応電流、各階段化されたはしご形摂動電圧のサイクルの開始および終了地点での感応電流、および階段化されたはしご形摂動電圧から得られた感応電流の平均値のうちの1つを用いたり、これから得られた電流値を、四則演算、指数、ログ、三角関数などの数学的関数で表現して得ることのできる値を用いることを特徴とする、請求項5に記載の生体試料内の分析対象物質の濃度測定方法。
- 前記検定式は、前記フィーチャーを線形に結合した前記フィーチャー関数に対して多変数回帰分析を適用して得られ、前記検定式は、電極の材質、電極の配列方式、流路の形状、使用される試薬の特性に応じて異なることを特徴とする、請求項1に記載の生体試料内の分析対象物質の濃度測定方法。
- 前記分析対象物質は、glucose、β−hydroxybutyric acid、cholesterol、triglyceride、lactate、pyruvate、alcohol、bilirubin、uric acid、phenylketouria、creatine、creatinine、glucose−6−phosphate dehydrogenase、NAD(P)H、ケトン体のうちの1つであることを特徴とする、請求項7に記載の生体試料内の分析対象物質の濃度測定方法。
- 前記酸化還元酵素は、グルコース酸化酵素(glucose oxidase、GOx)、グルコース脱水素化酵素(glucose dehydrogenase、GDH)、グルタメート酸化酵素(glutamate oxidase)、グルタメート脱水素化酵素(glutamate dehydrogenase)、コレステロール酸化酵素、コレステロールエステル化酵素、ラクテート酸化酵素、アスコルビン酸酸化酵素、アルコール酸化酵素、アルコール脱水素化酵素、ビリルビン酸化酵素、ケトン体脱水素化酵素のうちの1つであることを特徴とする、請求項7に記載の生体試料内の分析対象物質の濃度測定方法。
- 前記電子伝達媒体は、ferrocene、ruthenium hexamine(III)chloride、potassium ferricyanide、1,10−phenanthroline−5,6−dione、bipyridineあるいはphenanthrolineをリガンドとして有するosmium complex、2,6−dimethyl−1,4−benzoquinone、2,5−dichloro−1,4−benzoquinone、3,7−diamino−5−phenothiaziniumthionine、1−methoxy−5−methylphenazinium methylsulfate、methylene blue、toluidine blueのうちの1つであることを特徴とする、請求項1に記載の生体試料内の分析対象物質の濃度測定方法。
- 前記一定の直流電圧は、0−800mVの範囲の電圧で、1秒以上1分以内の時間の間持続的または間欠的に印加され、前記第1感応電流は、前記一定の直流電圧が印加されている間に1回または数回測定することを特徴とする、請求項1に記載の生体試料内の分析対象物質の濃度測定方法。
- 前記階段化されたはしご形電圧は、1つの階段の高さ(Vstep)が0.5〜20mVであり、前記1つの階段の持続時間(tstep)が0.001〜0.1秒であり、前記階段化されたはしご形電圧の中心電圧と前記一定の直流電圧との差(Vcenter)が−150〜150mVであり、前記階段化されたはしご形電圧の中心電圧と山または谷電圧との差(Vpeak)が5〜150mVであり、前記階段化されたはしご形電圧の周期または1つの山と隣接する他の1つの山との間の時間間隔(tcycle)が0.01〜1秒の範囲内の値であることを特徴とする、請求項2に記載の生体試料内の分析対象物質の濃度測定方法。
- 前記フィーチャー関数は、前記一定の直流電流から得られた感応電流値を用いる関数、前記階段化されたはしご形電圧から得られた感応電流値を用いる関数、前記フィーチャー関数は、測定装置で測定した温度値を用いる関数、測定された感応電流値を、四則演算、指数、ログ、三角関数などの数学的関数で表現して得ることのできる関数であることを特徴とする、請求項1に記載の生体試料内の分析対象物質の濃度測定方法。
- 生体試料内の分析対象物質の濃度測定装置において、
前記分析対象物質の酸化還元反応を触媒可能な酸化還元酵素と電子伝達媒体が固定されており、作動電極および補助電極を備えた試料セルが挿入されるコネクタと、
前記分析対象物質の酸化還元反応を開示し電子伝達反応を進行させるための一定の直流電圧と、前記一定の直流電圧に続いて、前記試料セルの電位を揺動させるための、Λ状の階段化されたはしご形摂動電圧を印加するためのデジタル−アナログコンバータ回路と、
前記デジタル−アナログコンバータ回路を制御し、前記Λ状の階段化されたはしご形摂動電圧を用いて、検定式から直接前記分析対象物質の濃度値を求めるマイクロコントローラとを含むことを特徴とする、生体試料内の分析対象物質の濃度測定装置。 - 前記マイクロコントローラは、予め定められた前記Λ状の階段化されたはしご形摂動電圧を発生させられる定数値を格納し、一定電圧を印加する時は、定められた定数を前記デジタル−アナログコンバータのレジスタに記録し、前記摂動電圧を印加する時は、定められた時間を周期として、前記定数値を増加減させてデジタル−アナログコンバータ回路のレジスタに記録して、前記デジタル−アナログコンバータが前記デジタル−アナログコンバータ回路のレジスタに記録された定数値に応じて、前記2つの電極の間に前記一定電圧または摂動電圧を印加するようにすることを特徴とする、請求項14に記載の生体試料内の分析対象物質の濃度測定装置。
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KR20160032974A (ko) | 2016-03-25 |
US10690619B2 (en) | 2020-06-23 |
CN105738430B (zh) | 2019-02-22 |
KR101666978B1 (ko) | 2016-10-24 |
TWI569009B (zh) | 2017-02-01 |
US20160077037A1 (en) | 2016-03-17 |
US11378540B2 (en) | 2022-07-05 |
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