Artículos de revistas
Influence of temperature, anions and size distribution on the zeta potential of DMPC, DPPC and DMPE lipid vesicles
Fecha
2015-03Registro en:
Morini, Marcela Ana; Sierra, Maria Belen; Pedroni, Viviana Isabel; Alarcon, Laureano Martin; Appignanesi, Gustavo Adrian; et al.; Influence of temperature, anions and size distribution on the zeta potential of DMPC, DPPC and DMPE lipid vesicles; Elsevier Science; Colloids And Surfaces B: Biointerfaces; 131; 3-2015; 54-58
0927-7765
Autor
Morini, Marcela Ana
Sierra, Maria Belen
Pedroni, Viviana Isabel
Alarcon, Laureano Martin
Appignanesi, Gustavo Adrian
Disalvo, Edgardo Anibal
Resumen
The purpose of the work is to compare the influence of the multilamellarity, phase state, lipid head groups and ionic media on the origin of the surface potential of lipid membranes. With this aim, we present a new analysis of the zeta potential of multilamellar and unilamellar vesicles composed by phosphatidylcholines (PC) and phosphatidylethanolamines (PE) dispersed in water and ionic solutions of polarizable anions, at temperatures below and above the phase transition. In general, the adsorption of anions seems to explain the origin of the zeta potential in vesicles only above the transition temperature (Tc). In this case, the sign of the surface potential is ascribed to a partial orientation of head group moiety towards the aqueous phase. This is noticeable in PC head groups but not in PEs, due to the strong lateral interaction between PO and NH group in PE.