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Metal ion-induced activation of molecular oxygen in pigmented polymers. Biochim Biophys Acta 1986 Aug 06;883(1):41-5

Date

08/06/1986

Pubmed ID

3015234

DOI

10.1016/0304-4165(86)90132-7

Scopus ID

2-s2.0-0022530208 (requires institutional sign-in at Scopus site)   18 Citations

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.

Author List

Hintz P, Kalyanaraman B

Author

Balaraman Kalyanaraman PhD Professor in the Biophysics department at Medical College of Wisconsin




MESH terms used to index this publication - Major topics in bold

Animals
Cations
Cattle
Copper
Edetic Acid
Electron Spin Resonance Spectroscopy
Hydrogen Peroxide
Hydroxides
Hydroxyl Radical
Iron
Kinetics
Lanthanum
Magnesium
Manganese
Melanins
Metals
Nickel
Oxidation-Reduction
Oxygen
Zinc