title: Spectrophotometric determination of H2O2-generating oxidases using oxyhemoglobin as oxygen donor and indicator.
abstract: 1. Spectrophotometric determination of oxygen uptake using oxyhemoglobin as oxygen donor and indicator was used for assay of H2O2-generating oxidases like monoamine oxidase and glucose oxidase. 2. In order to decompose H2O2 formed during the oxygen uptake, catalase and methanol (or ethanol) was added to the respiratory system. At pH values higher than 7.5 the oxydation of deoxygenated hemoglobin to methemoglobin was less than 3%. 2. Oxidases with low Km for oxygen can be assayed using the spectrophotometric method if suitable correction factors are introduced into the calculation of oxygen uptake. The correction factor represents the ratio of the rate of formation (or disappearance) of one of the reactants and the rate of oxyhemoglobin deoxygenation, measured under identical experimental conditions.
mesh_terms: D001596:Benzylamines; D003576:Electron Transport Complex IV / Q000032:analysis; D005949:Glucose Oxidase / Q000032:analysis*; D006861:Hydrogen Peroxide; D007700:Kinetics; D008995:Monoamine Oxidase / Q000032:analysis*; D010084:Oxidation-Reduction; D010101:Oxygen Consumption; D010108:Oxyhemoglobins; D013053:Spectrophotometry
chemical_list: D001596:Benzylamines; D010108:Oxyhemoglobins; D006861:Hydrogen Peroxide; D005949:Glucose Oxidase; D008995:Monoamine Oxidase; D003576:Electron Transport Complex IV