Effect of chitosan on distearoylphosphatidylglycerol (DSPG) films at air/water and liquid/liquid interfaces

C. I. CÁMARA, M. V. COLQUI, N. WILKE, A. JIMENEZ-KAIRUZ Y L. M.YUDI.

PERGAMON-ELSEVIER SCIENCE LTD

Lugar: Amsterdam; Año: 2013 vol. 94 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 DSPGto tetraethylammonium (TEA+) cation transfer from the aqueous to the organic phase. This effect wasreversed by the presence of chitosan, which modifies the film structure. Special emphasis was placed onthe nature of the supporting aqueous electrolyte (LiCl or CaCl2). In the presence of LiCl the permeabilityof the film increases when chitosan is present in the aqueous phase, minimizing the blocking effect of thefilm on TEA+ transfer probably due to the presence of bare zones at the interface. Oppositely, in presenceof Ca2+, the enhancement of permeability was not observed, probably due to the impediment of chitosanto penetrate into the very tigh