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A Kinetic Analysis of Superoxide Adduct Formation in the Presence of Typical Scavengers

Mitsuta, Keiichi ; Hiramatsu, Midori ; Ohya-Nishiguchi, Hiroaki ; Kamada, Hitoshi ; Fujii, Kanae

Bulletin of the Chemical Society of Japan, 1994-02, Vol.67 (2), p.529-538 [Periódico revisado por pares]

Tokyo: The Chemical Society of Japan

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  • Título:
    A Kinetic Analysis of Superoxide Adduct Formation in the Presence of Typical Scavengers
  • Autor: Mitsuta, Keiichi ; Hiramatsu, Midori ; Ohya-Nishiguchi, Hiroaki ; Kamada, Hitoshi ; Fujii, Kanae
  • Assuntos: Analytical, structural and metabolic biochemistry ; Biological and medical sciences ; Enzymes and enzyme inhibitors ; Fundamental and applied biological sciences. Psychology ; Oxidoreductases
  • É parte de: Bulletin of the Chemical Society of Japan, 1994-02, Vol.67 (2), p.529-538
  • Descrição: The superoxide dismutase (SOD) activity of Cu,Zn-, Mn-, and Fe-SODs, and the SOD-like activity of ferricytochrome c, nitro blue tetrazolium (NBT), epinephrine, pyrogallol, L-ascorbic acid, and hydroxylamine, were investigated by the method of kinetic competition against superoxide radicals (O2−•) using ESR spectroscopy with a nitrone spin-trap 5,5-dimethyl-1-pyrroline N-oxide (DMPO). These activities depended on the pH and/or kind of the O2−• generating system used. A comparison of the results obtained for two O2−• generating systems of KO2 and hypoxanthine–xanthine oxidase showed that the effective pH in the former system was 1 or more higher than that in the latter. A new competition kinetic theory which includes a parameter of the stoichiometric ratio has been developed. Consequently, the profile of the non-stoichiometric competition reaction between DMPO and scavengers for O2−• was theoretically clarified.
  • Editor: Tokyo: The Chemical Society of Japan
  • Idioma: Inglês
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