Water defects induced by expansion and electrical fields in DMPC and DMPE monolayers: Contribution of hydration and confined water

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 corr...

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Autores principales:	Almaleck, H., Gordillo, G.J., Disalvo, A.
Formato:	JOUR
Materias:	Capacitance measurements Dimyristoylphosphatidylcholine (DMPC) Dimyristoylphosphatidylethanolamine (DMPE) Head group rotation-head group hydration Lipid monolayers Air water interfaces Confined water Defects induced Dimyristoylphosphatidylcholine Electrical field Energy value Ethanolamines H-bonds Head groups Hydration shell Interphase regions Lateral interactions Lipid monolayer Lipid species Low area Phosphate group Phosphocholine States of water Surface pressures Capacitance measurement Cyclic voltammetry Electric fields Fracture Lipids Monolayers Hydration dimyristoylphosphatidylcholine dimyristoylphosphatidylethanolamine ethanolamine glycerophospholipid lipid mercury phosphate unclassified drug water article controlled study cyclic potentiometry dynamics electric capacitance electric field electric potential hydration hydrogen bond lipid monolayer molecular interaction phase transition temperature pressure gradient priority journal surface property temperature Lipid Bilayers Phosphatidylethanolamines Temperature Water
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_09277765_v102_n_p871_Almaleck
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

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spelling	todo:paper_09277765_v102_n_p871_Almaleck2023-10-03T15:47:10Z Water defects induced by expansion and electrical fields in DMPC and DMPE monolayers: Contribution of hydration and confined water Almaleck, H. Gordillo, G.J. Disalvo, A. Capacitance measurements Dimyristoylphosphatidylcholine (DMPC) Dimyristoylphosphatidylethanolamine (DMPE) Head group rotation-head group hydration Lipid monolayers Air water interfaces Confined water Defects induced Dimyristoylphosphatidylcholine Dimyristoylphosphatidylethanolamine (DMPE) Electrical field Energy value Ethanolamines H-bonds Head groups Hydration shell Interphase regions Lateral interactions Lipid monolayer Lipid species Low area Phosphate group Phosphocholine States of water Surface pressures Capacitance measurement Cyclic voltammetry Electric fields Fracture Lipids Monolayers Hydration dimyristoylphosphatidylcholine dimyristoylphosphatidylethanolamine ethanolamine glycerophospholipid lipid mercury phosphate unclassified drug water article controlled study cyclic potentiometry dynamics electric capacitance electric field electric potential hydration hydrogen bond lipid monolayer molecular interaction phase transition temperature pressure gradient priority journal surface property temperature Dimyristoylphosphatidylcholine Lipid Bilayers Lipids Phosphatidylethanolamines Temperature Water 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. © 2012 Elsevier B.V. Fil:Gordillo, G.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_09277765_v102_n_p871_Almaleck
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Capacitance measurements Dimyristoylphosphatidylcholine (DMPC) Dimyristoylphosphatidylethanolamine (DMPE) Head group rotation-head group hydration Lipid monolayers Air water interfaces Confined water Defects induced Dimyristoylphosphatidylcholine Dimyristoylphosphatidylethanolamine (DMPE) Electrical field Energy value Ethanolamines H-bonds Head groups Hydration shell Interphase regions Lateral interactions Lipid monolayer Lipid species Low area Phosphate group Phosphocholine States of water Surface pressures Capacitance measurement Cyclic voltammetry Electric fields Fracture Lipids Monolayers Hydration dimyristoylphosphatidylcholine dimyristoylphosphatidylethanolamine ethanolamine glycerophospholipid lipid mercury phosphate unclassified drug water article controlled study cyclic potentiometry dynamics electric capacitance electric field electric potential hydration hydrogen bond lipid monolayer molecular interaction phase transition temperature pressure gradient priority journal surface property temperature Dimyristoylphosphatidylcholine Lipid Bilayers Lipids Phosphatidylethanolamines Temperature Water
spellingShingle	Capacitance measurements Dimyristoylphosphatidylcholine (DMPC) Dimyristoylphosphatidylethanolamine (DMPE) Head group rotation-head group hydration Lipid monolayers Air water interfaces Confined water Defects induced Dimyristoylphosphatidylcholine Dimyristoylphosphatidylethanolamine (DMPE) Electrical field Energy value Ethanolamines H-bonds Head groups Hydration shell Interphase regions Lateral interactions Lipid monolayer Lipid species Low area Phosphate group Phosphocholine States of water Surface pressures Capacitance measurement Cyclic voltammetry Electric fields Fracture Lipids Monolayers Hydration dimyristoylphosphatidylcholine dimyristoylphosphatidylethanolamine ethanolamine glycerophospholipid lipid mercury phosphate unclassified drug water article controlled study cyclic potentiometry dynamics electric capacitance electric field electric potential hydration hydrogen bond lipid monolayer molecular interaction phase transition temperature pressure gradient priority journal surface property temperature Dimyristoylphosphatidylcholine Lipid Bilayers Lipids Phosphatidylethanolamines Temperature Water Almaleck, H. Gordillo, G.J. Disalvo, A. Water defects induced by expansion and electrical fields in DMPC and DMPE monolayers: Contribution of hydration and confined water
topic_facet	Capacitance measurements Dimyristoylphosphatidylcholine (DMPC) Dimyristoylphosphatidylethanolamine (DMPE) Head group rotation-head group hydration Lipid monolayers Air water interfaces Confined water Defects induced Dimyristoylphosphatidylcholine Dimyristoylphosphatidylethanolamine (DMPE) Electrical field Energy value Ethanolamines H-bonds Head groups Hydration shell Interphase regions Lateral interactions Lipid monolayer Lipid species Low area Phosphate group Phosphocholine States of water Surface pressures Capacitance measurement Cyclic voltammetry Electric fields Fracture Lipids Monolayers Hydration dimyristoylphosphatidylcholine dimyristoylphosphatidylethanolamine ethanolamine glycerophospholipid lipid mercury phosphate unclassified drug water article controlled study cyclic potentiometry dynamics electric capacitance electric field electric potential hydration hydrogen bond lipid monolayer molecular interaction phase transition temperature pressure gradient priority journal surface property temperature Dimyristoylphosphatidylcholine Lipid Bilayers Lipids Phosphatidylethanolamines Temperature Water
description	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. © 2012 Elsevier B.V.
format	JOUR
author	Almaleck, H. Gordillo, G.J. Disalvo, A.
author_facet	Almaleck, H. Gordillo, G.J. Disalvo, A.
author_sort	Almaleck, H.
title	Water defects induced by expansion and electrical fields in DMPC and DMPE monolayers: Contribution of hydration and confined water
title_short	Water defects induced by expansion and electrical fields in DMPC and DMPE monolayers: Contribution of hydration and confined water
title_full	Water defects induced by expansion and electrical fields in DMPC and DMPE monolayers: Contribution of hydration and confined water
title_fullStr	Water defects induced by expansion and electrical fields in DMPC and DMPE monolayers: Contribution of hydration and confined water
title_full_unstemmed	Water defects induced by expansion and electrical fields in DMPC and DMPE monolayers: Contribution of hydration and confined water
title_sort	water defects induced by expansion and electrical fields in dmpc and dmpe monolayers: contribution of hydration and confined water
url	http://hdl.handle.net/20.500.12110/paper_09277765_v102_n_p871_Almaleck
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_version_	1782029998745452544

Water defects induced by expansion and electrical fields in DMPC and DMPE monolayers: Contribution of hydration and confined water

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