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Orive, A.G.; Creus, A.H.; Grumelli, D.; Benitez, G.A.; Andrini, L.; Requejo, F.G.; Bonazzola, C.; Salvarezza, R.C. "Oxygen reduction on iron-melanin granular surfaces" (2009) Journal of Physical Chemistry C. 113(39):17097-17103
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Abstract:

We report the catalytic activity of iron-eumelanin granular deposits supported on graphite for the oxygen reduction in neutral and alkaline solutions. These deposits contain quinone groups and iron-melanin complexes as revealed by XPS, XANES, EXAFS, and IR spectroscopy. Voltammetric data show that the iron-eumelanin system exhibits higher electrocatalytic activity than quinone/hydroquinone films (Q/QH) on the same substrate. In contrast to Q/QH deposits, the iron-containing eumelanin system is able to reduce oxygen with transfer of four electrons, thus allowing the formation of reactive hydroxyl species. Our results can explain the physical chemistry basis of the oxygen-radical induced lipid peroxidation and consequent neurodegeneration of the melanin-containing dopaminergic neurons observed by several authors. © 2009 American Chemical Society.

Registro:

Documento: Artículo
Título:Oxygen reduction on iron-melanin granular surfaces
Autor:Orive, A.G.; Creus, A.H.; Grumelli, D.; Benitez, G.A.; Andrini, L.; Requejo, F.G.; Bonazzola, C.; Salvarezza, R.C.
Filiación:Instituto de Investigaciones Fisicoquímicas, Teóricas y Aplicadas, CONICET-Universidad Nacional de La Plata, Sucursal 4 Casilla de Correo 16, La Plata 1900, Argentina
Instituto de Investigaciones Fisicoquímicas, Teóricas y Aplicadas and Departamento de Física, CONICET-Universidad Nacional de La Plata, Argentina
Departamento de Química Física, Universidad de la Laguna, La Laguna, Tenerife, Spain
Departamento de Química Inorgánica, Analítica y Química Física, Universidad de Buenos Aires, Argentina
Palabras clave:Alkaline solutions; Catalytic activity; Dopaminergic neurons; Electrocatalytic activity; Eumelanins; EXAFS; Four electrons; Granular deposits; Hydroxyl species; IR spectroscopy; Lipid peroxidation; Neurodegeneration; Oxygen Reduction; Quinone groups; Voltammetric data; XANES; XPS; Catalyst activity; Deposits; Electrocatalysis; Electrochemical sensors; Electrolytic reduction; Graphite; Iron compounds; Neurons; Oxygen; Physical chemistry; Iron deposits
Año:2009
Volumen:113
Número:39
Página de inicio:17097
Página de fin:17103
DOI: http://dx.doi.org/10.1021/jp905560d
Título revista:Journal of Physical Chemistry C
Título revista abreviado:J. Phys. Chem. C
ISSN:19327447
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_19327447_v113_n39_p17097_Orive

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Citas:

---------- APA ----------
Orive, A.G., Creus, A.H., Grumelli, D., Benitez, G.A., Andrini, L., Requejo, F.G., Bonazzola, C.,..., Salvarezza, R.C. (2009) . Oxygen reduction on iron-melanin granular surfaces. Journal of Physical Chemistry C, 113(39), 17097-17103.
http://dx.doi.org/10.1021/jp905560d
---------- CHICAGO ----------
Orive, A.G., Creus, A.H., Grumelli, D., Benitez, G.A., Andrini, L., Requejo, F.G., et al. "Oxygen reduction on iron-melanin granular surfaces" . Journal of Physical Chemistry C 113, no. 39 (2009) : 17097-17103.
http://dx.doi.org/10.1021/jp905560d
---------- MLA ----------
Orive, A.G., Creus, A.H., Grumelli, D., Benitez, G.A., Andrini, L., Requejo, F.G., et al. "Oxygen reduction on iron-melanin granular surfaces" . Journal of Physical Chemistry C, vol. 113, no. 39, 2009, pp. 17097-17103.
http://dx.doi.org/10.1021/jp905560d
---------- VANCOUVER ----------
Orive, A.G., Creus, A.H., Grumelli, D., Benitez, G.A., Andrini, L., Requejo, F.G., et al. Oxygen reduction on iron-melanin granular surfaces. J. Phys. Chem. C. 2009;113(39):17097-17103.
http://dx.doi.org/10.1021/jp905560d