Kyowa Medex Co., Ltd.

Hitachi Chemical Diagnostics Systems Co., Ltd.

Haruyo Soya

Tomomi Murakami

Yuki Katayama

Haruki Tsunoda

Yu Ohsugi

Ayako Yoda

Masashi Matsushita

Noriyuki Ogawa

The present invention provides a method for preserving a leuco chromogen-containing aqueous solution comprising: adding at least one acid compound selected from the group consisting of a phosphoric acid compound, a carboxylic acid compound, a sulfonic acid compound, and a sulfuric acid compound to a leuco chromogen-containing aqueous solution; a method for stabilizing a leuco chromogen in an aqueous solution comprising: adding at least one acid compound selected from the group consisting of a phosphoric acid compound, a carboxylic acid compound, a sulfonic acid compound, and a sulfuric acid compound to a leuco chromogen-containing aqueous solution; and a liquid reagent comprising a leuco chromogen and at least one acid compound selected from the group consisting of a phosphoric acid compound, a carboxylic acid compound, a sulfonic acid compound, and a sulfuric acid compound.

Method for preserving leuco chromogen-containing aqueous solution

A method is provided for measuring glycated hemoglobin in a hemoglobin-containing sample which comprises reacting glycated hemoglobin in the hemoglobin-containing sample with an enzyme that catalyzes a reaction of oxidizing the glycated hemoglobin to generate hydrogen peroxide, in the presence of at least one anionic surfactant selected from the group consisting of N-acyl taurine in which a hydrogen atom of the amino group may be substituted with a substituent, alkyl sulfoacetic acid, polyoxyethylene alkyl ether acetic acid, N-acyl amino acid in which a hydrogen atom of the amino group may be substituted with a substituent, polyoxyethylene alkyl ether phosphoric acid, polyoxyethylene polycyclic phenyl ether phosphoric acid, alkyl phosphoric acid, and salts thereof, to generate hydrogen peroxide, and measuring the generated hydrogen peroxide.

Method for measuring glycated hemoglobin

Described is a method for preserving an aqueous solution comprising a leuco chromogen, comprising adding at least one compound selected from the group consisting of polyoxyethylene alkylamine and polyoxyethylene alkenylamine to the aqueous solution containing a leuco chromogen, and a method for stabilizing a leuco chromogen, comprising allowing the leuco chromogen to coexist in an aqueous solution comprising at least one compound selected from the group consisting of polyoxyethylene alkylamine and polyoxyethylene alkenylamine.

Method for preserving aqueous solution containing leuco chromogen

The present invention provides: a method for preserving an aqueous solution containing a leuco chromogen, comprising adding a compound having at least one substituent selected from the group consisting of a nitroso group and an azo group and having an ability to coordinate a metal ion or a salt thereof to the aqueous solution containing a leuco chromogen; a method for stabilizing a leuco chromogen, comprising allowing the leuco chromogen to coexist in an aqueous solution comprising a compound having at least one substituent selected from the group consisting of a nitroso group and an azo group and having an ability to coordinate a metal ion or a salt thereof; and a liquid reagent comprising a leuco chromogen and a compound having at least one substituent selected from the group consisting of a nitroso group and an azo group and having an ability to coordinate a metal ion or a salt thereof.

It is to provide a method for measuring glycated hemoglobin in a hemoglobin-containing sample, comprising: reacting glycated hemoglobin in the hemoglobin-containing sample with a proteolytic enzyme in the presence of at least one salt selected from the group consisting of a pyridinium salt, a phosphonium salt, an imidazolium salt, and an isoquinolinium salt; reacting the obtained reaction product with fructosyl peptide oxidase; and measuring the generated hydrogen peroxide. The present invention provides a method for accurately measuring glycated hemoglobin in a hemoglobin-containing sample.

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Sunto-gun, Japan

Haruyo Soya