Thionine immobilized in crosslinked chitosan films

被引：14

作者：

Gerbino, Leandro ^{[2
]}

Riva, Julieta ^{[1
]}

Strumia, Miriam ^{[2
]}

Iglesias, Rodrigo A. ^{[1
]}

Baruzzi, Ana M. ^{[1
]}

机构：

[1] Univ Nacl Cordoba, INFIQC, CONICET, Fac Ciencias Quim,Dept Fisicoquim, RA-5000 Cordoba, Argentina

[2] Univ Nacl Cordoba, Fac Ciencias Quim, Dept Quim Organ, RA-5000 Cordoba, Argentina

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 2008年 / 131卷 / 02期

关键词：

optical sensor; electrochromism; thin solid film; pH sensor;

D O I：

10.1016/j.snb.2007.12.006

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

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 (K-a) for the immobilized dye of K-a = 2.7 x 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. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：455 / 461

页数：7

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