Kinetic investigations of the autoxidation of adrenalin.
Generation rates of superoxide anions (O2-) by autoxidizing adrenalin at pH 9.5 were determined in solutions containing either superoxide dismutase (0.85 M-1 S-1) or hydroxylamine (0.0185 M-1 S-1) as competitive scavengers. The rate constants of O2- with adrenalin and hydroxylamine were calculated for neutral and alkaline solutions. The respective values were for adrenalin: 5.6 X 10(4) M-1 S-1, pH 7.8; 7.0 X 10(3) M-1 S-1, pH 9.5--and for hydroxylamine 5.9 X 10(4) M-1 S-1, pH 7.8; 3.4 X 10(4) M-1 S-1, pH 9.5. The effects of various competitors and O2- sources on the rate constants were compared.
D004837:Epinephrine; D006898:Hydroxylamines; D007700:Kinetics; D008433:Mathematics; D010084:Oxidation-Reduction; D013482:Superoxide Dismutase; D013481:Superoxides
D006898:Hydroxylamines; D013481:Superoxides; D013482:Superoxide Dismutase; D004837:Epinephrine