"Interaction of chitosan and self-assembled distearoylphosphatidic acid molecules at liquid/liquid and air/water interfaces. Effect of temperature"

CÁMARA CANDELARIA INÉS; RIVA JULIETA SOLEDAD; JUAREZ A. VALERIA; YUDI, LIDIA MABEL

JOURNAL OF PHYSICAL ORGANIC CHEMISTRY

JOHN WILEY & SONS LTD

Lugar: LOndres; Año: 2016 vol. 29 p. 672 - 672

0894-3230

he effect of the polyelectrolyte, chitosan (CHI), on distearoylphosphatidic acid (DSPA) films was analyzed by cyclic voltammetry, surface pressure-area isotherm, and Brewster Angle Microscopy. DSPA films formed at liquid/liquid interface produced a blocking effect to the electrochemical transfer of tetraethylammonium (TEA+) cation from the aqueous to the organic phase; as can be deduced from the cyclic voltammetry experiments. Monolayer?s of DSPA were carried out at different experimental conditions, temperature, subphase solutions (LiCl or CaCl2), CHI concentration. Both aqueous electrolytes studied exert strong interaction with the negative charged polar head groups of phospholipids, which enhances the lateral interactions of the hydrocarbon chains, forming a very structured film. Under these conditions the presence of CHI produces a shift of TEA+ transfer potential towards more positive values due to the less availability of negative sites of the phospholipids for TEA+ adsorption,