Effect of chitosan on distearoylphosphatidylglycerol films at air/water and liquid/liquid interfaces.

CÁMARA, C; COLQUI QUIROGA, M; WILKE, N; JIMENEZ KAIRUZ, AF; YUDI, ML

PERGAMON-ELSEVIER SCIENCE LTD

Lugar: Amsterdam; Año: 2013 p. 124 - 124

he effect of chitosan on distearoylphosphatidylglycerol (DSPG) films was analyzed by cyclic voltammetry, surface pressure-area and surface potential –area isotherm and Brewster Angle Microscopy. Experiments of cyclic voltammetry at a liquid/liquid interface demonstrated a blocking effect of DSPG to tetraethylammonium (TEA+) cation transfer from the aqueous to the organic phase. This effect was reversed by the presence of chitosan, which modifies the film structure. Special emphasis was placed on the nature of the supporting aqueous electrolyte (LiCl or CaCl2). In the presence of LiCl the permeability of the film increases when chitosan is present in the aqueous phase, minimizing the blocking effect of the film on TEA+ transfer probably due to the presence of bare zones at the interface. Oppositely, in presence of Ca2+, the enhancement of permeability was not observed, probably due to the impediment of chitosan to penetrate into the very tightly compacted film of DSPG. Electrochemica