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dc.contributor.author
Almaleck, Samuel Hugo
dc.contributor.author
Gordillo, Gabriel Jorge
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Disalvo, Edgardo Anibal
dc.date.available
2017-08-25T22:04:55Z
dc.date.issued
2012-10
dc.identifier.citation
Almaleck, Samuel Hugo; Gordillo, Gabriel Jorge; Disalvo, Edgardo Anibal; Water defects induced by expansion and electrical fields in DMPCand DMPE monolayers: contribution of hydration and confined water; Elsevier; Colloids and Surfaces B: Biointerfaces; 102; 10-2012; 871-878
dc.identifier.issn
0927-7765
dc.identifier.uri
http://hdl.handle.net/11336/23085
dc.description.abstract
The values of capacitance of dimyristoylphosphatidylcholine (DMPC) and dimyristoylphosphatidylethanolamine (DMPE) monolayers on Hg, derived from cyclic voltammetry studies indicate that when the lipids are near the phase transition temperature fractures are formed at a critical area beyond that corresponding to the hydration shell of the lipids in the liquid expanded state. Similar fractures are inferred to be formed when an electric field is applied at constant area, at a breaking potential which is a function of the lipid species. These voltage values denote that energy involved in the transition induced by the electrical field is much higher for DMPE than for DMPC at low areas. This can be explained by the higher intermolecular lateral interactions by H-bonds between the ethanolamine and phosphate groups. However, at larger areas, the energy values for DMPC are as high as for DMPE which is understood to be due to the higher hydration of phosphocholine head groups. This finding gives a new insight in relation to the dynamics of the lipid head groups at the membrane interphase region in terms of the states of water between the lipids. This is congruent with previous results evaluated with the well known ΔΠ vs. surface pressure plots in monolayers of the same lipids at air-water interfaces.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Lipid Monolayers
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Capacitance Measurements
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Head Group Rotation-Head Group Hydration
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Dimyristoylphosphatidylcholine (Dmpc)
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Dimyristoylphosphatidylethanolamine (Dmpe)
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Otras Ciencias Químicas
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Ciencias Químicas
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CIENCIAS NATURALES Y EXACTAS
dc.title
Water defects induced by expansion and electrical fields in DMPCand DMPE monolayers: contribution of hydration and confined water
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-08-25T19:53:37Z
dc.journal.volume
102
dc.journal.pagination
871-878
dc.journal.pais
Países Bajos
dc.journal.ciudad
Ámsterdam
dc.description.fil
Fil: Almaleck, Samuel Hugo. Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Departamento de Química Analítica y Fisicoquímica. Cátedra de Química General e Inorgánica; Argentina
dc.description.fil
Fil: Gordillo, Gabriel Jorge. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Química Inorgánica, Analítica y Química Física; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Química, Física de los Materiales, Medioambiente y Energía. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Química, Física de los Materiales, Medioambiente y Energía; Argentina
dc.description.fil
Fil: Disalvo, Edgardo Anibal. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Departamento de Química Analítica y Fisicoquímica. Cátedra de Química General e Inorgánica; Argentina
dc.journal.title
Colloids and Surfaces B: Biointerfaces
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0927776512005437
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.colsurfb.2012.09.031
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