title: [Quantitative method of determining the activity of zinc- and copper-dependent superoxide dismutase in biological material].
abstract: The activity of superhydroxide dismutase was estimated by following rate of inhibition of non-enzymatic reduction of tetrazolium salt in reaction with superhydroxide ions, which were continuously generated in a photochemical system. The quantitative estimations were achieved by using para-nitrotetrazolium chloride, which was reduced to formazanes soluble in acetone. Formation of formazanes by the photochemical system (riboflavin + tetramethylethylene diamine + O2 + para-nitrotetrazolium chloride + light) in presence of biological material and cyanide was compared with formation of formazanes in absence of cyanide for specific estimation of Zn, Cu-dependent forms of superhydroxide dismutase. The rate of enzymatic cyanide sensitive inhibition of the photochemical formation of formazanes from paranitrotetrazolium chloride was determined by the activity of Zn, Cu-dependent superhydroxide dismutase in biological material and might be expressed in units of the activity -- un. ac. = 10/(0,026.% inhibition--1,3).
mesh_terms: D000818:Animals; D003300:Copper; D003593:Cytoplasm / Q000201:enzymology; D004789:Enzyme Activation / Q000187:drug effects; D007202:Indicators and Reagents; D008099:Liver / Q000201:enzymology; D008722:Methods; D009574:Nitro Compounds; D051381:Rats; D013482:Superoxide Dismutase / Q000032:analysis* / Q000037:antagonists & inhibitors; D013778:Tetrazolium Salts; D015032:Zinc
chemical_list: D007202:Indicators and Reagents; D009574:Nitro Compounds; D013778:Tetrazolium Salts; D003300:Copper; D013482:Superoxide Dismutase; D015032:Zinc
vernacular_title: Kolichestvennyĭ metod opredeleniia aktivnosti tsink-, med'zavissimoĭ superoksiddismutazy v biologicheskom materiale.