Unitika Ltd.

Mitsubishi Cable Industries, Ltd.

Akihiro Shinzaki

Tadao Suzuki

Miwa Watanabe

Mihoko Era

Akiko Shimizu

Naoko Kenmotsu

A method of enzymatic analysis utilizing a color-development signal amplification system associated with enzymatic cycling of NAD-NADH interconversion in the presence of dehydrogenase and its substrate, wherein the dehydrogenase is selected from the group consisting of alcohol dehydrogenase derived from Zymomonas and amino acid dehydrogenase derived from thermophilic microorganisms is disclosed. The use of alcohol dehydrogenase derived from Zymomonas provides an extremely higher detection sensitivity than that in the conventional method. The use of amino acid dehydrogenase derived from thermophilic microorganisms improves reliability of the method for a longer period of time than that in the conventional method.

Method for enzymatic analysis and reagant therefor

A system or kit for analysis of phosphatase comprising a reagent I containing NADP or NADPH as a main component, and a reagent II containing components for color-development signal amplification utilizing NAD-NADH interconversion, wherein at least one of the hydrogen donors participating in the NAD-NADH interconversion is included in reagent I, but not in reagent II, which eliminates the necessity that the reagent II is further separated into two parts. This enables the preparation of reagent II as a mixture which can be readily used and which can be preserved for a long period of time without 'reagent blank' occurring. Additionally, the present kit eliminates the necessity of mixing reagents I and II immediately before actual use and thus permits periodical analysis of samples with a reagent having the same components for long time periods with reliable and uniform sensitivity.

Analytical system or kit for phosphatase

A method for measuring diaphorase activity comprising mixing a sample comprising diaphorase with nitro blue tetrazolium, EDTA or a salt thereof, at least one of nicotinamide adenine dinucleotide and nicotinamide adenine dinucleotide phosphate, and a surface active agent, to form an assay solution; and measuring an increase in absorbance, due to the formation of diformazan, in the assay solution and reagents used in a method for measuring diaphorase activity comprising a first solution, a second solution, EDTA, and a surface active agent, wherein the first solution comprises at least one of nicotinamide adenine dinucleotide or nicotinamide adenine dinucleotide phosphate and the second solution comprises nitro blue tetrazolium.

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Kyoto, Japan

Akihiro Shinzaki