Gamma-resonance study of the reaction of iron ions with synthetic L-dopa melanin
The reaction of Fe/sup 3 +/ and Fe/sup 2 +/ ions with synthetic L-dopa melanin, which is a model compound of natural melanin (the melanoprotein granules in the pigment epithelial cells in vertebrate and human eyes), has been studied by gamma-resonance spectroscopy. The investigations showed that L-dopa melanin is capable of effectively binding iron ions and that it displays oxidative or reducing properties with respect to Fe, depending on the composition of the subsystem of the Fe ions and the ambient pH. Trivalent Fe/sup 3 +/ ions form stronger complexes with L-dopa melanin than do Fe/sup 2 +/ ions. The coordination takes place mainly with the carboxyl groups and the amino and imino groups of the polymer. The conformational state of the polymer apparently changes as the pH is varied.
- OSTI ID:
- 6280482
- Journal Information:
- Sov. J. Coordinat. Chem.; (United States), Journal Name: Sov. J. Coordinat. Chem.; (United States) Vol. 11:9; ISSN SJCCD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
59 BASIC BIOLOGICAL SCIENCES
640302 -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
AMINO ACIDS
ANGULAR MOMENTUM
AUTONOMIC NERVOUS SYSTEM AGENTS
BINDING ENERGY
CARBOXYLIC ACIDS
CHLORIDES
CHLORINE COMPOUNDS
COMPLEXES
COMPLEXOMETRY
COUPLING
DOPA
DRUGS
ELECTRON SPIN RESONANCE
ENERGY
GAMMA SPECTRA
HALIDES
HALOGEN COMPOUNDS
HYDROXY ACIDS
HYDROXY COMPOUNDS
HYPERFINE STRUCTURE
INTERMEDIATE COUPLING
IRON CHLORIDES
IRON COMPLEXES
IRON COMPOUNDS
ISOMER SHIFT
J-J COUPLING
L-S COUPLING
LIGANDS
MAGNETIC RESONANCE
MAGNETISM
MELANIN
MOESSBAUER EFFECT
NEUROREGULATORS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PARAMAGNETISM
PARTICLE PROPERTIES
PIGMENTS
REDOX POTENTIAL
RELAXATION
RESONANCE
RESPONSE MODIFYING FACTORS
SPECTRA
SPIN
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENT COMPOUNDS
VALENCE