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EP0243126A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Method of measuring hydrogen peroxide or of measuring an enzyme or biochemical substrate liberating the peroxide

Assignee: Sanwa Kagaku Kenkyusho Co Ltd
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Filing: 1987-04-16
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Granted: —
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Expires: 2007-04-16
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Abstract

Abstract To an aqueous sample containing hydrogen peroxide there are added (a) an aromatic hydroxy compound (e.g. a phenol or naphthol which may have substituents), (b) a diamine compound (e.g. an aniline compound, e.g. a p-amino aniline), and (c) an oxidase enzyme (peroxidase or catalase), and after mixing and standing for 5 minutes to form a quinomic dye the depth of color of the dye in solution is measured and compared to a control, to measure the amount of the H 2 0 2 . An enzyme (e.g. uricase) and its substrate substance (e.g. uric acid) from which H 2 0 2 is liberated can be mixed to form the H 2 0 2 sample and from the dye measurement the amount of either the enzyme or its substrate can be calculated. The method is reproducible and rapid and can be used in an automatic analyzer.

Inventors

  • 👤 Shizuo Uno
  • 👤 Masayasu Kurono
  • 👤 Mari Mikamo
  • 👤 Shinobu Ito
  • 👤 Kiichi Sawai

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-02 16:57
CPC Classifications
C; C12; C12Q; C12Q1/00; C12Q1/26; C12Q1/30; C12Q1/28; C12Q2326/00; C12Q2326/50

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 50 words
A method of quantitatively measuring hydrogen peroxide in a sample, which comprises the steps of adding to the sample an aromatic compound with a hydroxy radical, a diamine compound and an oxidase to cause a reaction and form a quinonic dye, and determining the color tone (intensity) of the dye.
Claim 2
Independent Claim 50 words
A method of quantitatively measuring hydrogen peroxide in a sample, which comprises the steps of adding to the sample an aromatic compound with a hydroxy radical, a diamine compound and an oxidase to cause a reaction and form a quinonic dye, and determining the color tone (intensity) of the dye.
Claim 3
Dependent Claim 23 words
A method as claimed in Claim 1, wherein said hydroxy radical containing aromatic compound is selected from the group of phenols and naphthols.
Claim 4
Dependent Claim 67 words
A method as claimed in Claim 1 or 2, wherein said diamine compound is an aniline compound of the formula wherein Z 1 and Z 2 are alkyl group, acyl group or sulfo radical, respectively, or Z 1 is a heterocyclic- group together with Z 2 and the neighbouring nitrogen atom, Z 3 and Z 4 are hydrogen atom, halogen atom, alkyl group or acyl group, respectively.
Claim 5
Dependent Claim 15 words
A method as claimed in Claim 1, 2 or 3, wherein said oxidase is peroxidase.
Claim 6
Dependent Claim 33 words
A method as claimed in Claim 2, wherein said phenol compound is that of the formula wherein X 1 and X 2 are hydrogen atom, halogen atom, alkyl group or nitro radical, respectively.
Claim 7
Dependent Claim 35 words
A method as claimed in Claim 2, wherein said naphthol compound is that of the formula wherein Y 1 and Y 2 are hydrogen atom, halogen atom, nitro radical, sulfo radical or acyl group, respectivcely.
Claim 8
Dependent Claim 13 words
A method as claimed in Claim 3, wherein said aniline compound is p-aminodiethylaniline.
Claim 9
Dependent Claim 84 words
8, A method of quantitatively measuring biochemical substances and enzymes in a sample, which comprises steps of reacting the biochemical substance with the enzyme to liberate hydrogen peroxide, adding an aromatic compound with a hydroxy radical, a diamine compound and an oxidase as claimed in any preceding claim, to cause a reaction with the hydrogen peroxide and form a quinonic dyes and determine the color tone of the dye so as to measure the amount of the biochemical substance or enzyme in the sample:.

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