Composition for measurement of potassium ion concentration and composition for elimination of ammonium ions

A composition for elimination of ammonium ions, which comprises a) glutamate dehydrogenase, b) glucose dehydrogenase, and c) nicotinamide adenine dinucleotide of reduced type (NADH) or nicotinamide adenine dinucleotide phosphate of reduced type (NADPH), said composition being suitable for the elimination of ammonium ions.

A combination of a first composition for measurement of potassium ion concentration and a second composition for elimination of ammonium ions, the first composition comprising a) pyruvate kinase, b) glycerol kinase, c) glycerol-3-phosphate oxidase, d) peroxidase, e) a chromogen of reduced type, e) adenosine diphosphate or a salt thereof, and e) phosphoenolpyruvic acid or a salt thereof, and the second composition comprising a) glutamate dehydrogenase, b) glucose dehydrogenase, and c) nicotinamide adenine dinucleotide of reduced type (NADH) or nicotinamide adenine dinucleotide phosphate of reduced type (NADPH), said combination being suitable for the measurement of potassium ion concentration and for the elimination of ammonium ions.

A method for the measurement of potassium ion concentration in a body fluid sample, said method comprising reacting said body fluid sample with a composition comprising a) pyruvate kinase, b) glycerol kinase, c) glycerol-3-phosphate oxidase, d) peroxidase, e) a chromogen of reduced type, f) adenosine diphosphate or a salt thereof, and g) phosphoenolpyruvic acid or a salt thereof and thereafter performing a colorimetric analysis.

A method for the elimination of ammonium ions in a body fluid sample, said method comprising reacting said body fluid sample with a composition comprising) glutamate dehydrogenase, b) glucose dehydrogenase, and c) nicotinamide adenine dinucleotide of reduced type (NADH) or nicotinamide adenine dinucleotide phosphate of reduced type (NADPH).

A method for the simultaneous elimination of ammonium ions in a body fluid sample and measurement of potassium ion concentration in said body fluid sample, said method comprising reacting said body fluid sample with a composition comprising a) pyruvate kinase, b) glycerol kinase, c) glycerol-3-phosphate oxidase, d) peroxidase, e) a chromogen of reduced type, f) adenosine diphosphate or a salt thereof, g) phosphoenolpyruvic acid or a salt thereof, h) glutamate dehydrogenase, i) glucose dehydrogenase, and j) nicotinamide adenine dinucleotide of reduced type (NADH) or nicotinamide adenine dinucleotide phosphate of reduced type (NADPH) and thereafter performing a colorimetric analysis.