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: 2007
ISSN:
0925-4005
Resumen:
Abstract
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 ofKa) 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.a = 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.