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  • Title: Metal ion-induced activation of molecular oxygen in pigmented polymers.
    Author: Hintz P, Kalyanaraman B.
    Journal: Biochim Biophys Acta; 1986 Aug 06; 883(1):41-5. PubMed ID: 3015234.
    Abstract:
    Diamagnetic and paramagnetic metal ions enhanced the rate of production of hydrogen peroxide during autoxidation of melanin pigments, as measured using an oxidase electrode. However, redox-active metal ions, such as Fe3+ and Cu2+, caused a marked decrease in H2O2 production. Evidence for redox-active metal ion-dependent formation of hydroxyl radicals during autoxidation of melanin pigments has been obtained using the electron spin resonance-spin trapping method. Evidence for direct reduction of Fe3+ by melanin polymers also has been obtained using optical spectroscopy. Mechanisms of molecular activation of oxygen induced by metal ions on melanin polymers are discussed.
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