INFIQC   05475
INSTITUTO DE INVESTIGACIONES EN FISICO- QUIMICA DE CORDOBA
Unidad Ejecutora - UE
artículos
Título:
Interaction of Chitosan with mono and di- valent anions in aqueous solution studied by cyclic voltammetry at a water/1,2 - dichloroethane interface
Autor/es:
JULIETA SOLEDAD RIVA; ANA VALERIA JUAREZ; DANTE M. BELTRAMO; LIDIA MABEL YUDI
Revista:
ELECTROCHIMICA ACTA
Editorial:
PERGAMON-ELSEVIER SCIENCE LTD
Referencias:
Lugar: Amsterdam; Año: 2012 vol. 59 p. 39 - 44
ISSN:
0013-4686
Resumen:
The interaction of the cationic polyelectrolyte chitosan (CHI), of different molecular weights, with two anions, picrate (Pi) and eosin (Eo), in water was analysed at pH 2.50 and 5.00. For this purpose the anions transfer current across a water/ 1,2 – dichloroethane interface was employed to quantify anions concentration in absence or in presence of CHI. When CHI was added in increasing amounts to aqueous solutions containing Eo or Pi, a gradual decrease in current values was observed, evidencing the binding of the anions to the polymer. This effect was more important at low pH values and for CHI with the highest molecular weight. From the results it is concluded that the interaction Eo-CHI is stronger than the corresponding to Pi, probably due to the higher negative charge, and therefore the more pronounced hydrophilic nature of the first anion, which could lead to favour the electrostatic interactions with the cationic polyelectrolyte.