JP3889834B2 - Reagent for measuring reduced nicotinamide coenzyme, measurement method using the same, and test specimen for measurement - Google Patents

Reagent for measuring reduced nicotinamide coenzyme, measurement method using the same, and test specimen for measurement Download PDF

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JP3889834B2
JP3889834B2 JP18497796A JP18497796A JP3889834B2 JP 3889834 B2 JP3889834 B2 JP 3889834B2 JP 18497796 A JP18497796 A JP 18497796A JP 18497796 A JP18497796 A JP 18497796A JP 3889834 B2 JP3889834 B2 JP 3889834B2
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reduced nicotinamide
measuring
coenzyme
measurement
nicotinamide coenzyme
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JPH1031018A (en
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敏 帖佐
仁 岩崎
正志 小野
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Arkray Inc
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Arkray Inc
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Description

【0001】
【発明の属する技術分野】
本発明は、還元型ニコチンアミド補酵素の測定用試薬およびそれを用いた測定方法並びに測定用試験片に関するものである。
【0002】
【従来の技術】
還元型ニコチンアミド補酵素、すなわち、還元型ニコチンアミドアデニンジヌクレオチド(NADH)および還元型ニコチンアミドアデニンジヌクレオチドホスフェート(NADPH)は、生体内での酸化還元反応に関与する補酵素である。したがって、還元型ニコチンアミド補酵素を測定することにより、これに関連する酵素または基質の測定ができる。
【0003】
従来から、NADHおよびNADPHの測定方法としては、以下のような方法が知られている。
(1)NADHおよびNADPHの有する紫外部の吸収または蛍光を直接測定する方法。
(2)触媒の存在下、NADHおよびNADPHとレサズリンの反応によって生成したレゾルフィンの蛍光を測定する方法。
(3)電子伝達体の存在下、NADHおよびNADPHとNTBやMTT等のテトラゾリウム塩とを反応させてホルマザン色素を生成し、その可視部の吸収を測定する方法。
【0004】
【発明が解決しようとする課題】
しかしながら、従来の測定方法は、以下の問題を有する。まず、前記紫外部の吸収および蛍光を測定する方法(1)は、尿等を測定対象とする場合には、紫外部に吸収を有するまたは蛍光を有する共存物質、例えば、リボフラビン等のビタミンB2剤、フルオレッセインナトリウム等の蛍光造影剤によって妨害を受ける。この問題は、前記(2)の方法も同様である。
【0005】
また、前記テトラゾリウム塩を発色剤として用いる方法(3)は、試料中に共存するアスコルビン酸、ビリルビン等の還元性物質による影響で、ブランク発色を生じるという欠点がある。
【0006】
この他に、NADHを用いずに生体試料中の成分を測定する方法として、酸化酵素を用いる方法があるが、前記テトラゾリウム塩を用いる方法(3)と同様に、試料中に共存するアスコルビン酸、ビリルビン等の還元性物質の影響を受けて発色が阻害されるという欠点がある。
【0007】
さらに、NADHおよびNADPHの測定方法において、測定操作等の観点から乾式測定の実現が求められている。本発明は、前記従来の問題を解決し、紫外部に吸収若しくは蛍光を有する共存物質および還元性物質の影響を受けず、乾式測定が可能な還元型ニコチンアミド補酵素の測定用試薬およびそれを用いた測定方法並びに測定用試験片の提供を目的とする。
【0008】
【課題を解決するための手段】
前記目的を達成するために、本発明の還元型ニコチンアミド補酵素の測定用試薬は、下記式(I)で示されるスチリル色素を含有する。
【0009】
【化5】

Figure 0003889834
【0010】
前記式(I)中、R 1 は、炭素数1〜10のアルキル基であり、R 2 は、−NR’R’’で表される置換アミノ基であり、前記R’およびR’’は、それぞれ独立に炭素数1〜5のアルキル基であり、Xはハロゲンアニオンを表す。
【0011】
前記式(I)で示されるスチリル色素としては、下記式(II)で示されるスチリル色素が好ましい。
【0012】
【化6】
Figure 0003889834
【0013】
この特殊なスチリル色素は、電子伝達体の存在下で、NADHおよびNADPHの少なくとも一方と作用させると、紫外部に蛍光等を有する共存物質およびアスコルビン酸、ビリルビン等の影響を受けず、高い選択性でNADH等を測定できる。具体的には、10-6M以下の微量のNADH等の測定が可能である。さらに、この特殊なスチリル色素は、乾式測定に供しても高い反応性を失うことがない。このように、本発明にかかるスチリル色素は、高い反応性を有し、乾式測定に適用できるが、これは、スチリル色素の分子構造中のメチン鎖に酸性官能基が付加されているためと推察される。
【0014】
本発明の測定用試薬において、電子伝達体を含有してもよい。また、この電子伝達体としてアホラーゼを用いることが好ましい。また、本発明の測定用試薬において、還元型ニコチンアミド補酵素は、通常、還元型ニコチンアミドアデニンジヌクレオチドおよび還元型ニコチンアミドアデニンジヌクレオチドホスフェートの少なくとも一方の補酵素である。また、本発明の測定用試薬は、乾式測定用であるのが好ましい。
【0015】
つぎに、本発明の還元型ニコチンアミド補酵素の測定方法は、ジアホラーゼの存在下、前記式(I)で示されるスチリル色素と液体試料に含まれる還元型ニコチンアミド補酵素とを反応させて前記スチリル色素を褪色させ、可視部の吸光度の変化を測定する。
【0016】
本発明の測定方法において、前記液体試料としては、例えば、血液、尿、骨髄液、リコール、胸水、腹水、汗、涙または唾液があげられる。本発明の測定方法において、電子伝達体としてジアホラーゼを用いることが好ましく、この場合、通常、前記スチリル色素0.1〜10.0molに対しジアホラーゼ0.12〜1.20mkatの割合で用いる。
【0017】
本発明の測定方法において、還元型ニコチンアミド補酵素は、通常、還元型ニコチンアミドアデニンジヌクレオチドおよび還元型ニコチンアミドアデニンジヌクレオチドホスフェートの少なくとも一方の補酵素である。また、本発明の測定方法は、乾式測定法であるのが好ましい。
【0018】
つぎに、本発明の還元型ニコチンアミド補酵素の測定用試験片は、前記本発明の電子伝達体を含有する還元型ニコチンアミド補酵素の測定用試薬を担体に付着させたものである。この測定用試験片は、例えば、前記本発明の電子伝達体を含有する測定用試薬を担体に含浸する方法、若しくは、前記試薬を担体に塗布、印刷または噴霧することにより作製できる。本発明の測定用試験片において、還元型ニコチンアミド補酵素は、通常、還元型ニコチンアミドアデニンジヌクレオチドおよび還元型ニコチンアミドアデニンジヌクレオチドホスフェートの少なくとも一方の補酵素である。また、本発明の測定用試験片は、乾式測定用であるのが好ましい。
【0019】
【発明の実施の形態】
1の具体例としては、メチル基、エチル基、イソプロピル基、ブチル基、イソアミル基、オクチル基、2−エチルヘキシル基、ドデシル基等のアルキル基が挙げられる
【0020】
R’、R’’によって置換されたベンゼン環の具体例としては、4−ジメチルアミノベンゼン、1,2,3,4−テトラヒドロキノリン、ユロリジン等が挙げられる。
【0021】
Xの具体例としては、塩化物、臭素化物、フッ素化物およびヨウ素化物等のハロゲン化物があり、例えば、メタンスルホン酸イオン、p−トルエンスルホン酸イオン等のスルホン酸イオン、メチル硫酸イオンおよびエチル硫酸イオン等の硫酸イオンが挙げられ、その他、過塩素酸イオン、硝酸イオン等のイオンも例示できる。
【0022】
本発明にかかるスチリル色素の具体例としては、下記の式(II)に示す2−[1−シアノ−4−(4−ジメチルアミノフェニル)−1,3−ブタジエニル]−3−エチルベンゾチアゾリウム アイオダイドがあげられる。
【0023】
【化7】
Figure 0003889834
【0024】
つぎに、本発明にかかるスチリル色素の製造の一例について説明する。スチリル色素として、2−[4−(4−ジメチルアミノ)フェニル−1,3−ブタジエニル−1−シアノ]−3−エチルベンゾチアゾリウム アイオダイドを合成した。
【0025】
すなわち、まず、2−シアノメチル−3−エチルベンゾチアゾリウム アイオダイド1.2gおよび4−ジメチルアミノシンナムアルデヒド0.7gを10mlの無水酢酸に加え混合する。この混合物を、80℃のウオーターバスで2〜3分間加熱すると、針状結晶が析出する。さらに、20分間加熱し、析出した針状結晶を吸引ろ過して分離し、メタノールで洗浄して、ついでメタノールから再結晶すると前記スチリル色素が1g得られる。
【0026】
本発明において、電子伝達体としては、ジアホラーゼが好ましい。
【0027】
本発明にかかるスチリル色素は、NADHおよびNADPHの合計1モルに対して、好ましくは0.1〜10.0モル、より好ましくは0.5〜2.0モル用いればよい。電子伝達体、すなわちジアホラーゼは、触媒として作用するので、その量は触媒量でよい。先に述べたように、通常、0.1〜1.0mkat/lのような割合で用いる。
【0028】
その他の測定パラメーターは、主として電子伝達体によって制約を受けるので、電子伝達体がジアホラーゼの場合、通常のpHの範囲は5〜9、好ましくはpH7〜8であり、温度は通常20〜40℃、好ましくは30〜37℃である。なお、本発明にかかるスチリル色素は、反応性が高いため、反応に要する時間は瞬時に近い極めて短い時間である。
【0029】
本発明が対象とする液体試料は、通常、体液、例えば血液またはその成分(血漿、血清等)、尿、髄液または細胞抽出液等であるが、NADHおよびNADPHの少なくとも一方を含む液体試料ならいずれも本発明の対象となる。
【0030】
これらの試料中に含まれる酵素または酵素の基質等の成分を測定しようとする場合、その酵素と基質によって生成する物質を還元酵素及び酸化型ニコチンアミド補酵素とともに反応させ、生成する還元型ニコチンアミド補酵素の量を本発明の方法により測定する。これにより、目的とする液体試料中の成分の量、濃度を測定することができる。下記の式(X)に本発明の測定用試薬の反応の一例を示す。
【0031】
【化8】
Figure 0003889834
【0032】
前記の式(X)の右側の反応式において、ジアホラーゼ(Diaphorase)存在下、NADHにより、本発明にかかるスチリル色素(blue dye)が褪色する(discolor)するとともに、前記NADHがNADとなる。また、前記の式(X)の左側の反応式は、β−ハイドロキシステロイドデヒドロゲナーゼ(β−HSD)の存在下、NADにより、3β−ハイドロキシバイル酸が3−オキソステロイドになるとともに、前記NADがNADHとなる。すなわち、この反応は、NADを補酵素とするβ−HSDの酵素反応である。したがって、この場合、本発明によるNADHの測定により、β−HSD等の測定が可能となる。
【0033】
この他に、本発明の対象となるのは、例えば、α−ハイドロキシステロイドデヒドロゲナーゼ、アルコールデヒドロゲナーゼ、グリセロールデヒドロゲナーゼ、ピルビン酸デヒドロゲナーゼ、グルコースデヒドロゲナーゼなどである。
【0034】
つぎに、本発明の還元型ニコチンアミド補酵素の測定用試験片に用いる担体としては、例えば、濾紙、布、不織布、ポリエチレンテレフタレートフィルム、ポリエチレンフィルム、ガラス、セラミック等があげられ、測定用試験片の種類に応じ適宜選択される。例えば、測定用試験片を本発明の測定用試薬を担体に含浸して作製する場合は、吸収可能な担体として濾紙が好適であり、また、一般的な担体としては、ポリエチレンテレフタートフィルムが好適である。
【0035】
この測定用試験片を用いた測定方法は、以下のとおりである。すなわち、まず血液等の液状試料を前記測定用試験片に付着させる。すると、この試験片が褪色するので、この褪色程度を分光光度計若しくはデンシトメーター等で測定することにより、液状試料中のNADH等を測定することができる。
【0036】
【実施例】
つぎに、実施例について説明する。実施例に用いるスチリル色素として、前記の式(II)で表される2−[1−シアノ−4−(4−ジメチルアミノフェニル)−1,3−ブタジエニル]−3−エチルベンゾチアゾリウム アイオダイドを用いた。以下に、反応液組成および測定用検体(液状試料)を示す。なお、下記の反応液および測定用検体の組成は、全て最終濃度を示す。
【0037】
(実施例1)
反応液組成
色素 0.05mmol/L
ジアホラーゼ 0.83mkat/L
Tris−HCl(pH8.0) 0.20 mol/L
測定用検体
β−NADH 0〜50μmol/L
(実施例2)
反応液組成
色素 0.05mmol/L
ジアホラーゼ 0.83mkat/L
Tris−HCl(pH8.0) 0.20 mol/L
測定用検体
β−NADH 0〜50μmol/L
アスコルビン酸 1.0g/L
つぎに、実施例1、2において、以下の手順で測定を行い検量線を作成した。
(1)反応セルにTris−HCl緩衝液を入れる。この量は、実施例1では2.65mlであり、実施例2では2.55mlである。
(2)色素液0.1ml、ジアホラーゼ0.15mlを反応セルに加えて攪拌した後、25℃で5分インキュベートする。
(3)各濃度の検体を、実施例1では0.1ml、実施例2では0.2ml、反応セルに加え、攪拌後、直ちに640nmにおける吸光度を測定し、検量線を作成する。
【0038】
実施例1の検量線を図1のグラフに、実施例2の検量線を図2のグラフに示す。このように、本発明の実施例では、反応後、直ちに測定に供することができるため、迅速な測定が可能であった。また、実施例2の結果より、還元物質であるアスコルビン酸が共存していても、この影響を受けることなくNADHの測定が可能であるといえる。
【0039】
(実施例3)
下記の組成の含浸液を調製し、これを10×10cmの濾紙(Whatman社製、3MM,Chr)に含浸し、ついで乾燥機(YAMATO社製、DF62)を用い50℃、15分間の条件で乾燥させた。そして、この濾紙を、幅5mmに裁断し、両面テープを用いてポリエチレンテレフタレートフィルムに貼着し、さらにこれを5mmに裁断し5×5mmの測定用試験片を作製した。
含浸液組成
色素 0.05mmol/L
ジアホラーゼ 0.83mkat/L
Tris−HCl(pH7.2) 0.2mol/L
他方、測定試料として、4種類の濃度のNADH水溶液(濃度:0μmol/L,20μmol/L,50μmol/L,100μmol/L)を準備した。
【0040】
そして、前記試験片に点着量8μlで上記NADH水溶液を点着し、色差計(Σ90、日本電色社製)を用い、測定時間120秒(エンドポイント)および測定温度25℃の条件で640nmでの反射率を測定した。この測定結果を、図3のグラフに示す。
【0041】
同図に示すように、NADHの濃度に対応する検量線が得られた。また、この実施例は、乾式測定の実施例であるが、測定において高い反応性を確認することができた。
【0042】
【発明の効果】
以上のように、本発明の還元型ニコチンアミド補酵素の測定用試薬は、前記の式(I)で示されるスチリル色素を含有する。この特殊なスチリル色素は、電子伝達体の存在下で、NADHおよびNADPHの少なくとも一方と作用させると、高い選択性でNADH等を測定できる。しかも、この測定では、紫外部に蛍光等を有する共存物質およびアスコルビン酸、ビリルビン等の影響を受けない。このため、本発明の測定用試薬を用いれば、前処理等をせずに、高い精度で簡単に試料中のNADH等を測定できる。また、この特殊なスチリル色素は、乾式測定に供しても高い反応性を失うことがないため、これを用いれば、測定用試験片を作成することが可能となる。この測定用試験片を用いることにより、NADH等の測定がさらに容易となる。
【図面の簡単な説明】
【図1】本発明の一実施例におけるNADHの検量線を示すグラフである。
【図2】本発明のその他の実施例におけるNADHの検量線を示すグラフである。
【図3】本発明のさらにその他の実施例におけるNADHの検量線を示すグラグである。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a reagent for measuring reduced nicotinamide coenzyme, a measuring method using the same, and a test specimen for measurement.
[0002]
[Prior art]
Reduced nicotinamide coenzymes, that is, reduced nicotinamide adenine dinucleotide (NADH) and reduced nicotinamide adenine dinucleotide phosphate (NADPH) are coenzymes involved in redox reactions in vivo. Therefore, by measuring the reduced nicotinamide coenzyme, the enzyme or substrate related thereto can be measured.
[0003]
Conventionally, the following methods are known as methods for measuring NADH and NADPH.
(1) A method for directly measuring absorption or fluorescence in the ultraviolet region of NADH and NADPH.
(2) A method for measuring the fluorescence of resorufin produced by the reaction of NADH and NADPH with resazurin in the presence of a catalyst.
(3) A method in which NADH and NADPH are reacted with a tetrazolium salt such as NTB or MTT in the presence of an electron carrier to produce a formazan dye, and absorption in the visible region is measured.
[0004]
[Problems to be solved by the invention]
However, the conventional measuring method has the following problems. First, in the method (1) for measuring the absorption and fluorescence in the ultraviolet part, when urine or the like is to be measured, a coexisting substance having absorption or fluorescence in the ultraviolet part, for example, vitamin B 2 such as riboflavin. Intercepted by fluorescent contrast agents such as fluorescein sodium. This problem also applies to the method (2).
[0005]
In addition, the method (3) using the tetrazolium salt as a color former has a drawback that blank color development occurs due to the influence of reducing substances such as ascorbic acid and bilirubin coexisting in the sample.
[0006]
In addition, as a method for measuring components in a biological sample without using NADH, there is a method using an oxidase. As in the method (3) using the tetrazolium salt, ascorbic acid coexisting in the sample, There is a drawback that color development is inhibited by the influence of a reducing substance such as bilirubin.
[0007]
Further, in the measurement method of NADH and NADPH, realization of dry measurement is required from the viewpoint of measurement operation and the like. The present invention solves the above-mentioned conventional problems, and provides a reagent for measuring reduced nicotinamide coenzyme that can be dry-measured without being affected by coexisting substances and reducing substances having absorption or fluorescence in the ultraviolet region, and The purpose is to provide a measurement method used and a test specimen for measurement.
[0008]
[Means for Solving the Problems]
In order to achieve the object, the reagent for measuring reduced nicotinamide coenzyme of the present invention contains a styryl dye represented by the following formula (I) .
[0009]
[Chemical formula 5]
Figure 0003889834
[0010]
In the formula (I), R 1 is an alkyl group having 1 to 10 carbon atoms, R 2 is a substituted amino group represented by —NR′R ″, and R ′ and R ″ are Each independently represents an alkyl group having 1 to 5 carbon atoms, and X represents a halogen anion.
[0011]
The styryl dye represented by the formula (I) is preferably a styryl dye represented by the following formula (II).
[0012]
[Chemical 6]
Figure 0003889834
[0013]
This special styryl dye is not affected by coexisting substances having fluorescence in the ultraviolet region, ascorbic acid, bilirubin, etc. when it is allowed to act on at least one of NADH and NADPH in the presence of an electron carrier. Can measure NADH and the like. Specifically, measurement of a trace amount of NADH or the like of 10 −6 M or less is possible. Furthermore, this special styryl dye does not lose high reactivity even when subjected to dry measurement. As described above, the styryl dye according to the present invention has high reactivity and can be applied to dry measurement. This is presumably because an acidic functional group is added to the methine chain in the molecular structure of the styryl dye. Is done.
[0014]
The measurement reagent of the present invention may contain an electron carrier. Moreover, it is preferable to use aphorase as this electron carrier. In the measurement reagent of the present invention , the reduced nicotinamide adenine dienzyme is usually at least one coenzyme of reduced nicotinamide adenine dinucleotide and reduced nicotinamide adenine dinucleotide phosphate. Further, the measurement reagent of the present invention is preferably used for dry measurement.
[0015]
Next, the method for measuring reduced nicotinamide coenzyme according to the present invention comprises reacting the styryl dye represented by the formula (I) with reduced nicotinamide coenzyme contained in a liquid sample in the presence of diaphorase. Discolor the styryl dye and measure the change in absorbance in the visible region.
[0016]
In the measurement method of the present invention, examples of the liquid sample include blood, urine, bone marrow fluid, recall, pleural effusion, ascites, sweat, tears, and saliva. In the measurement method of the present invention, diaphorase is preferably used as the electron carrier. In this case, the diaphorase is usually used at a ratio of 0.12 to 1.20 mkat with respect to 0.1 to 10.0 mol of the styryl dye.
[0017]
In the measurement method of the present invention, the reduced nicotinamide coenzyme is usually at least one coenzyme of reduced nicotinamide adenine dinucleotide and reduced nicotinamide adenine dinucleotide phosphate. The measurement method of the present invention is preferably a dry measurement method.
[0018]
Next, the test piece for measuring reduced nicotinamide coenzyme of the present invention is obtained by attaching a reagent for measuring reduced nicotinamide coenzyme containing the electron carrier of the present invention to a carrier. This test specimen for measurement can be produced, for example, by impregnating a carrier with a measurement reagent containing the electron carrier of the present invention, or by applying, printing or spraying the reagent onto the carrier. In the test specimen for measurement of the present invention, the reduced nicotinamide coenzyme is usually a coenzyme of at least one of reduced nicotinamide adenine dinucleotide and reduced nicotinamide adenine dinucleotide phosphate. Moreover, it is preferable that the measurement specimen of the present invention is for dry measurement.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Specific examples of R 1 include a methyl group, an ethyl group, an isopropyl group, a butyl group, isoamyl group, octyl group, 2-ethylhexyl group, an alkyl group and dodecyl group.
[0020]
Specific examples of the benzene ring substituted by R ′ and R ″ include 4-dimethylaminobenzene, 1,2,3,4-tetrahydroquinoline, urolidine and the like.
[0021]
Specific examples of X include halides such as chloride, bromide, fluoride and iodide, such as sulfonate ions such as methanesulfonate ion and p-toluenesulfonate ion, methyl sulfate ion and ethyl sulfate. Examples thereof include sulfate ions such as ions, and other examples include ions such as perchlorate ions and nitrate ions .
[0022]
Specific examples of the styryl dye according to the present invention include 2- [1-cyano-4- (4-dimethylaminophenyl) -1,3-butadienyl] -3-ethylbenzothiazo represented by the following formula (II) : Lium iodide is an example.
[0023]
[Chemical 7]
Figure 0003889834
[0024]
Next, an example of the production of the styryl dye according to the present invention will be described. As a styryl dye, 2- [4- (4-dimethylamino) phenyl-1,3-butadienyl-1-cyano] -3-ethylbenzothiazolium iodide was synthesized.
[0025]
That is, first, 1.2 g of 2-cyanomethyl-3-ethylbenzothiazolium iodide and 0.7 g of 4-dimethylaminocinnamaldehyde are added to 10 ml of acetic anhydride and mixed. When this mixture is heated in a water bath at 80 ° C. for 2 to 3 minutes, acicular crystals are precipitated. Further, the mixture is heated for 20 minutes, and the precipitated needle crystals are separated by suction filtration, washed with methanol, and then recrystallized from methanol to obtain 1 g of the styryl dye.
[0026]
In the present invention, the electron carrier is preferably diaphorase.
[0027]
The styryl dye according to the present invention is preferably used in an amount of 0.1 to 10.0 mol, more preferably 0.5 to 2.0 mol, per 1 mol of NADH and NADPH in total. Since the electron carrier, ie diaphorase, acts as a catalyst, the amount can be a catalytic amount. As described above, it is usually used at a ratio of 0.1 to 1.0 mkat / l.
[0028]
Since the other measurement parameters are mainly limited by the electron carrier , when the electron carrier is diaphorase, the normal pH range is 5 to 9, preferably pH 7 to 8, and the temperature is usually 20 to 40 ° C. Preferably it is 30-37 degreeC. In addition, since the styryl pigment | dye concerning this invention has high reactivity, the time required for reaction is a very short time near an instant.
[0029]
The liquid sample targeted by the present invention is usually a body fluid such as blood or its components (plasma, serum, etc.), urine, cerebrospinal fluid or cell extract, but any liquid sample containing at least one of NADH and NADPH. Both are objects of the present invention.
[0030]
When it is intended to measure components such as enzymes or enzyme substrates contained in these samples, reduced nicotinamide produced by reacting substances produced by the enzyme and substrate together with reductase and oxidized nicotinamide coenzyme The amount of coenzyme is measured by the method of the present invention. Thereby, the quantity and density | concentration of the component in the target liquid sample can be measured. An example of the reaction of the measuring reagent of the present invention is shown in the following formula (X) .
[0031]
[Chemical 8]
Figure 0003889834
[0032]
In the reaction formula on the right side of the formula (X), in the presence of diaphorase, NADH causes the styryl dye (blue dye) according to the present invention to fade, and the NADH becomes NAD. Further, the reaction formula on the left side of the formula (X) shows that, in the presence of β-hydroxysteroid dehydrogenase (β-HSD), 3AD-hydroxybile acid becomes 3-oxosteroid by NAD, and the NAD becomes NADH. It becomes. That is, this reaction is an enzyme reaction of β-HSD using NAD as a coenzyme. Therefore, in this case, β-HSD and the like can be measured by measuring NADH according to the present invention.
[0033]
In addition, the subject of the present invention is, for example, α-hydroxysteroid dehydrogenase, alcohol dehydrogenase, glycerol dehydrogenase, pyruvate dehydrogenase, glucose dehydrogenase and the like.
[0034]
Next, examples of the carrier used for the test piece for measurement of reduced nicotinamide coenzyme of the present invention include filter paper, cloth, non-woven fabric, polyethylene terephthalate film, polyethylene film, glass, ceramic, and the like. It is suitably selected according to the type of For example, when a test specimen for measurement is prepared by impregnating a carrier with the reagent for measurement of the present invention, a filter paper is preferable as an absorbable carrier, and a polyethylene terephthalate film is preferable as a general carrier. It is.
[0035]
The measuring method using this measuring specimen is as follows. That is, first, a liquid sample such as blood is attached to the test specimen for measurement. Then, since this test piece fades, the NADH etc. in a liquid sample can be measured by measuring this fading degree with a spectrophotometer or a densitometer.
[0036]
【Example】
Next, examples will be described. As the styryl dye used in the examples, 2- [1-cyano-4- (4-dimethylaminophenyl) -1,3-butadienyl] -3-ethylbenzothiazolium iodide represented by the above formula (II) Was used. The reaction liquid composition and the sample for measurement (liquid sample) are shown below. In addition, the following reaction liquid and the composition of the sample for measurement all show final concentrations.
[0037]
Example 1
Reaction solution composition Dye 0.05 mmol / L
Diaphorase 0.83mkat / L
Tris-HCl (pH 8.0) 0.20 mol / L
Sample for measurement β-NADH 0-50 μmol / L
(Example 2)
Reaction solution composition Dye 0.05 mmol / L
Diaphorase 0.83mkat / L
Tris-HCl (pH 8.0) 0.20 mol / L
Sample for measurement β-NADH 0-50 μmol / L
Ascorbic acid 1.0 g / L
Next, in Examples 1 and 2, measurement was performed by the following procedure to create a calibration curve.
(1) Put Tris-HCl buffer in the reaction cell. This amount is 2.65 ml in Example 1 and 2.55 ml in Example 2.
(2) Add 0.1 ml of the dye solution and 0.15 ml of diaphorase to the reaction cell, stir and then incubate at 25 ° C. for 5 minutes.
(3) Add 0.1 ml of the sample of each concentration to the reaction cell in Example 1 and 0.2 ml in Example 2, and immediately after stirring, measure the absorbance at 640 nm to prepare a calibration curve.
[0038]
The calibration curve of Example 1 is shown in the graph of FIG. 1, and the calibration curve of Example 2 is shown in the graph of FIG. Thus, in the Example of this invention, since it can use for a measurement immediately after reaction, the quick measurement was possible. Further, from the results of Example 2, it can be said that NADH can be measured without being affected by this, even if the reducing substance ascorbic acid coexists.
[0039]
(Example 3)
An impregnating solution having the following composition was prepared, impregnated into a 10 × 10 cm filter paper (manufactured by Whatman, 3MM, Chr), and then dried at 50 ° C. for 15 minutes using a dryer (YAMATO, DF62). Dried. And this filter paper was cut | judged to width 5mm, it stuck on the polyethylene terephthalate film using the double-sided tape, and this was further cut | judged to 5 mm, and the test piece for a measurement of 5x5 mm was produced.
Impregnating liquid composition Dye 0.05mmol / L
Diaphorase 0.83mkat / L
Tris-HCl (pH 7.2) 0.2 mol / L
On the other hand, four types of NADH aqueous solutions (concentrations: 0 μmol / L, 20 μmol / L, 50 μmol / L, 100 μmol / L) were prepared as measurement samples.
[0040]
Then, the NADH aqueous solution is spotted on the test piece in an amount of 8 μl, and a color difference meter (Σ90, manufactured by Nippon Denshoku Co., Ltd.) is used, and the measurement time is 120 seconds (end point) and the measurement temperature is 25 ° C. The reflectance at was measured. The measurement results are shown in the graph of FIG.
[0041]
As shown in the figure, a calibration curve corresponding to the concentration of NADH was obtained. Moreover, although this Example is an example of dry measurement, high reactivity could be confirmed in the measurement.
[0042]
【The invention's effect】
As described above, the reagent for measurement of reduced nicotinamide coenzyme of the present invention contains the styryl dye represented by the above formula (I) . When this special styryl dye is allowed to act on at least one of NADH and NADPH in the presence of an electron carrier, NADH and the like can be measured with high selectivity. In addition, this measurement is not affected by coexisting substances having fluorescence in the ultraviolet region, ascorbic acid, bilirubin and the like. For this reason, if the measuring reagent of this invention is used, NADH etc. in a sample can be easily measured with high precision, without pre-processing etc. Further, since this special styryl dye does not lose high reactivity even when subjected to dry measurement, it is possible to produce a test specimen for measurement. By using this measurement specimen, measurement of NADH and the like is further facilitated.
[Brief description of the drawings]
FIG. 1 is a graph showing a calibration curve of NADH in one example of the present invention.
FIG. 2 is a graph showing a calibration curve of NADH in another example of the present invention.
FIG. 3 is a graph showing a calibration curve of NADH in still another embodiment of the present invention.

Claims (14)

下記の式(I)で示されるスチリル色素を含有する還元型ニコチンアミド補酵素の測定用試薬。
Figure 0003889834
前記式(I)中、R1は、炭素数1〜10のアルキル基であり、R2は、−NR’R’’で表される置換アミノ基であり、前記R’およびR’’は、それぞれ独立に炭素数1〜5のアルキル基であり、Xはハロゲンアニオンを表す。
A reagent for measuring reduced nicotinamide coenzyme containing a styryl dye represented by the following formula (I).
Figure 0003889834
In the formula (I), R 1 is an alkyl group having 1 to 10 carbon atoms, R 2 is a substituted amino group represented by —NR′R ″, and R ′ and R ″ are Each independently represents an alkyl group having 1 to 5 carbon atoms, and X represents a halogen anion.
前記式(I)で示されるスチリル色素が、下記式(II)で示されるスチリル色素である請求項1に記載の還元型ニコチンアミド補酵素の測定用試薬。
Figure 0003889834
The reagent for measuring reduced nicotinamide coenzyme according to claim 1, wherein the styryl dye represented by the formula (I) is a styryl dye represented by the following formula (II).
Figure 0003889834
電子伝達体を含有し、前記電子伝達体がジアホラーゼである請求項1または2に記載の還元型ニコチンアミド補酵素の測定用試薬。  The reagent for measuring reduced nicotinamide coenzyme according to claim 1 or 2, comprising an electron carrier, wherein the electron carrier is diaphorase. 還元型ニコチンアミド補酵素が、還元型ニコチンアミドアデニンジヌクレオチドおよび還元型ニコチンアミドアデニンジヌクレオチドホスフェートの少なくとも一方の補酵素である請求項1〜3のいずれか一項に記載の還元型ニコチンアミド補酵素の測定用試薬。  The reduced nicotinamide coenzyme according to any one of claims 1 to 3, wherein the reduced nicotinamide coenzyme is at least one coenzyme of reduced nicotinamide adenine dinucleotide and reduced nicotinamide adenine dinucleotide phosphate. Reagent for enzyme measurement. 乾式測定用である請求項1〜4のいずれか一項に記載の還元型ニコチンアミド補酵素の測定用試薬。  The reagent for measuring reduced nicotinamide coenzyme according to any one of claims 1 to 4, which is used for dry measurement. ジアホラーゼの存在下、下記の式(I)で示されるスチリル色素と液体試料に含まれる還元型ニコチンアミド補酵素とを反応させて前記スチリル色素を褪色させ、可視部の吸光度の変化を測定する還元型ニコチンアミド補酵素の測定方法。
Figure 0003889834
前記式(I)中、R1は、炭素数1〜10のアルキル基であり、R2は、−NR’R’’で表される置換アミノ基であり、前記R’およびR’’は、それぞれ独立に炭素数1〜5のアルキル基であり、Xはハロゲンアニオンを表す。
Reduction in which the styryl dye represented by the following formula (I) is reacted with a reduced nicotinamide coenzyme contained in a liquid sample in the presence of diaphorase to cause the styryl dye to fade, and the change in absorbance in the visible region is measured. For measuring type nicotinamide coenzyme.
Figure 0003889834
In the formula (I), R 1 is an alkyl group having 1 to 10 carbon atoms, R 2 is a substituted amino group represented by —NR′R ″, and R ′ and R ″ are Each independently represents an alkyl group having 1 to 5 carbon atoms, and X represents a halogen anion.
前記式(I)で示されるスチリル色素が、下記式(II)で示されるスチリル色素である請求項6に記載の還元型ニコチンアミド補酵素の測定方法。
Figure 0003889834
The method for measuring a reduced nicotinamide coenzyme according to claim 6, wherein the styryl dye represented by the formula (I) is a styryl dye represented by the following formula (II).
Figure 0003889834
液体試料が、血液、尿、骨髄液、リコール、胸水、腹水、汗、涙または唾液である請求項6または7に記載の還元型ニコチンアミド補酵素の測定方法。  The method for measuring reduced nicotinamide coenzyme according to claim 6 or 7, wherein the liquid sample is blood, urine, bone marrow fluid, recall, pleural effusion, ascites, sweat, tears or saliva. スチリル色素0.1〜10.0molに対しジアホラーゼ0.12〜1.20mkatの割合である請求項6〜8のいずれか一項に記載の還元型ニコチンアミド補酵素の測定方法。  The method for measuring a reduced nicotinamide coenzyme according to any one of claims 6 to 8, wherein the ratio is 0.12 to 1.20 mkat of diaphorase with respect to 0.1 to 10.0 mol of a styryl dye. 還元型ニコチンアミド補酵素が、還元型ニコチンアミドアデニンジヌクレオチドおよび還元型ニコチンアミドアデニンジヌクレオチドホスフェートの少なくとも一方の補酵素である請求項6〜9のいずれか一項に記載の還元型ニコチンアミド補酵素の測定方法。  The reduced nicotinamide coenzyme according to any one of claims 6 to 9, wherein the reduced nicotinamide coenzyme is at least one coenzyme of reduced nicotinamide adenine dinucleotide and reduced nicotinamide adenine dinucleotide phosphate. Enzyme measurement method. 乾式測定法である請求項6〜10のいずれか一項に記載の還元型ニコチンアミド補酵素の測定方法。  The method for measuring reduced nicotinamide coenzyme according to any one of claims 6 to 10, which is a dry measurement method. 請求項3に記載の還元型ニコチンアミド補酵素測定用試薬を担体に付着させた還元型ニコチンアミド補酵素の測定用試験片。  A test piece for measuring reduced nicotinamide coenzyme, wherein the reagent for measuring reduced nicotinamide coenzyme according to claim 3 is attached to a carrier. 還元型ニコチンアミド補酵素が、還元型ニコチンアミドアデニンジヌクレオチドおよび還元型ニコチンアミドアデニンジヌクレオチドホスフェートの少なくとも一方の補酵素である請求項12に記載の還元型ニコチンアミド補酵素の測定用試験片。  The test piece for measurement of reduced nicotinamide coenzyme according to claim 12, wherein the reduced nicotinamide coenzyme is a coenzyme of at least one of reduced nicotinamide adenine dinucleotide and reduced nicotinamide adenine dinucleotide phosphate. 乾式測定用である請求項12または13に記載の還元型ニコチンアミド補酵素の測定用試験片。  The test piece for measuring reduced nicotinamide coenzyme according to claim 12 or 13, which is used for dry measurement.
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