| abstract |
A reagent for use in a colorimetric analysis of an analyte comprising: an oxidoreductase; a mediator; and a dye reagent to produce color by reduction, the dye reagent being a tetrazolium salt and the mediator comprising at least one complex selected from a copper complex, an osmium complex and a ruthenium complex, and in which at least one The coordinating atom of a ligand in the complex is selected from the group consisting of nitrogen, oxygen and sulfur and the complex comprises at least one ligand selected from ammonia, an amino acid, oxalic acid, and a ligand comprising an aromatic ring. |