PROCESS AND ANALYTICAL AGENT FOR THE DETERMINATION OF THE ENZYME GLUTAMATE-OXALACETATE-TRANSAMINASE

The present invention provides a process for the determination of the activity of glutamateoxalacetate-transaminase (GOT) in aqueous solutions in which (a) alpha -ketoglutarate is reacted with alanine-sulphinic acid, catalyzed by GOT, to give pyruvate, sulphur dioxide and glutamate, (b) the resultant pyruvate is reacted with phosphate and oxygen, catalyzed by pyruvate oxidase, to give acetyl phosphate, carbon dioxide and hydrogen peroxide, (c) the hydrogen peroxide and a chromogen is reacted, catalyzed by a peroxidase, to give a dyestuff and water and (d) the amount of dyestuff formed is determined, wherein the chromogen used is N-(3'-sulphonyl-4'-hydroxy-5'-chlorophenyl)-4-aminoantipyrine (SHYC-AA), 4,5-bis-[4-dimethylaminophenyl]-2-[3,5-dimethoxy-4-hydroxyphenyl]-imid azole (B-DDH-imidazole) or a related substance. The present invention also provides an analytical agent for the determination of the activity of GOT, comprising alpha -ketoglutarate, alanine-sulphinic acid, a chromogen, peroxidase, pyruvate oxidase, soluble phosphate, buffer and water, wherein the chromogen is N-(3'-sulphonyl-4'-hydroxy-5'-chlorophenyl)-4-aminoantipyrine (SHYC-AA) or 4,5-bis-[4-dimethylaminophenyl]-2-[3,5-dimethoxy-4-hydroxyphenyl]-imid azole (B-DDH-imidazole).