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

CÁMARA, CANDELARIA I.; RIVA, JULIETA S.; JUÁREZ, ANA V.; YUDI, LIDIA M.

JOURNAL OF PHYSICAL ORGANIC CHEMISTRY

JOHN WILEY & SONS LTD

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. Distearoylphosphatidic acid 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. Monolayers of DSPA were performed at different experimental conditions, temperature, subphase solutions (LiCl or CaCl2), and CHI concentration. Both aqueous electrolytes studied exert strong interaction with the negative-charged polar head groups of phospholipids, which enhance 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 toward more positive values because of the less availability of negative sites of the phospholi