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Mchanism of reaction of 3-hydroxyanthranilic acid with molecular oxygen

Journal Article


Abstract


  • The autoxidation of the tryptophan metabolite, 3-hydroxyanthranilic acid, at pH 7 gives rise to a p-quinone dimer and cinnabarinic acid. A novel dimer formed by radical-radical coupling of 3-hydroxyanthranilic acid is also produced. Labelling studies have shown that the C-2 oxygen in the p-quinone dimer is derived from molecular oxygen. A product versus time study of this reaction has revealed that, in the absence of catalase, cinnabarinic acid is formed but undergoes decomposition by hydrogen peroxide. At pH 7, in the presence of catalase, both the p-quinone dimer and cinnabarinic acid are formed at approximately the same rate and this rate of formation increases with increasing pH. Inclusion of superoxide dismutase was found to increase the rate of formation of cinnabarinic acid, suggesting that superoxide ions may also cause decomposition of cinnabarinic acid. This was confirmed by treating cinnabarinic acid with superoxide. A mechanism involving a common anthranilyl radical intermedaite is proposed to account for the formation of the different oxidation products. © 1990.

Publication Date


  • 1990

Citation


  • Manthey, M. K., Pyne, S. G., & Truscott, R. J. W. (1990). Mchanism of reaction of 3-hydroxyanthranilic acid with molecular oxygen. BBA - General Subjects, 1034(2), 207-212. doi:10.1016/0304-4165(90)90078-B

Scopus Eid


  • 2-s2.0-0025236783

Web Of Science Accession Number


Start Page


  • 207

End Page


  • 212

Volume


  • 1034

Issue


  • 2

Abstract


  • The autoxidation of the tryptophan metabolite, 3-hydroxyanthranilic acid, at pH 7 gives rise to a p-quinone dimer and cinnabarinic acid. A novel dimer formed by radical-radical coupling of 3-hydroxyanthranilic acid is also produced. Labelling studies have shown that the C-2 oxygen in the p-quinone dimer is derived from molecular oxygen. A product versus time study of this reaction has revealed that, in the absence of catalase, cinnabarinic acid is formed but undergoes decomposition by hydrogen peroxide. At pH 7, in the presence of catalase, both the p-quinone dimer and cinnabarinic acid are formed at approximately the same rate and this rate of formation increases with increasing pH. Inclusion of superoxide dismutase was found to increase the rate of formation of cinnabarinic acid, suggesting that superoxide ions may also cause decomposition of cinnabarinic acid. This was confirmed by treating cinnabarinic acid with superoxide. A mechanism involving a common anthranilyl radical intermedaite is proposed to account for the formation of the different oxidation products. © 1990.

Publication Date


  • 1990

Citation


  • Manthey, M. K., Pyne, S. G., & Truscott, R. J. W. (1990). Mchanism of reaction of 3-hydroxyanthranilic acid with molecular oxygen. BBA - General Subjects, 1034(2), 207-212. doi:10.1016/0304-4165(90)90078-B

Scopus Eid


  • 2-s2.0-0025236783

Web Of Science Accession Number


Start Page


  • 207

End Page


  • 212

Volume


  • 1034

Issue


  • 2