INSTITUTO DE QUIMICA, FISICA DE LOS MATERIALES, MEDIOAMBIENTE Y ENERGIA
Unidad Ejecutora - UE
Lipid monolayers on Hg as a valid experimental model for lipid membranes under electrical fields
ALMALECK HUGO S.; LAIRION, FABIANA; DISALVO, ANÍBAL E.; GORDILLO GABRIEL J.
CHEMISTRY AND PHYSICS OF LIPIDS
Año: 2006 vol. 139 p. 150 - 150
Abstract Monolayers spread on Hg drops are shown as a suitable experimental set up to study the influence of external electric fields on the structure of lipid membranes. The electrical response exhibits a sharp transition at 24 ◦C, the transition temperature of DMPC. In addition, voltammetric response of monolayers of mixtures of DMPC/DMPE adsorbed on mercury, shows a similar trend to that found for dipole potential of monolayers of the same composition spread on an airsolution interface. It is concluded that a lipid monolayer adsorbed in a mercurysolution interface, has comparable properties as those found in other experimental models of lipid membranes in similar conditions. In addition, they constitute an ideal set up to study the effect of electrical fields on the dynamic conformation of lipids as a function of packing change produced by the condensation in the gel state or by the interaction of polar head groups.