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Thionine immobilized in crosslinked chitosan films |
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| Authors: | Leandro Julieta Miriam Rodrigo A Ana M |
| Affiliation: | aDepartamento de Química Orgánica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Haya de la Torre esq, Medina Allende, Ciudad Universitaria, Córdoba 5000, Argentina bDepartamento de Fisicoquímica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, INFIQC, CONICET, Pabellón Argentina Ala 1 Piso 2, Ciudad Universitaria, Córdoba 5000, Argentina |
| Abstract: | Redox and acid–base 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 acid–base 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. |
| Keywords: | Optical sensor Electrochromism Thin solid film pH sensor |
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