INFIQC 05475
INSTITUTO DE INVESTIGACIONES EN FISICO- QUIMICA DE CORDOBA
Unidad Ejecutora - UE
artículos
Título:
Thionine immobilized in crosslinked chitosan films
Autor/es:
LEANDRO GERBINO; JULIETA RIVA; MIRIAM STRUMIA; RODRIGO IGLESIAS; ANA BARUZZI
Revista:
SENSORS AND ACTUATORS B-CHEMICAL
Editorial:
Elsevier
Referencias:
Año: 2008 vol. 131 p. 455 - 461
ISSN:
0925-4005
Resumen:
Redox and acidbase properties of thionine immobilized in crosslinked chitosan films are analyzed. The experimental conditions for the preparation of the films are described. Results obtained with cyclic voltammetry, spectroelectrochemistry and spectrophotometry indicate that the immobilized dye retains the redox and acidbase activity of free thionine. An acid dissociation constant (Ka) for the immobilized dye of Ka = 2.7×10−11 was obtained. Due to the stable and reversible pH dependent optical signal of the studied film, this membrane can be used as a building component of an optical pH sensor.
