Electrode coatings based on chitosan scaffolds
Electrode coatings based on chitosan scaffolds
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DOI：
10.1021/ac990954b
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发表时间：
2000-02-15
影响因子：
7.4
通讯作者：
Gorski, W
中科院分区：
文献类型：
--
作者：
Cruz, J;Kawasaki, M;Gorski, W
将生物聚合物壳聚糖（CHIT）薄膜浇铸在玻璃碳电极上，在壳聚糖链上接枝路西法黄VS染料（LYVS）进行修饰，并与戊二醛（GDI）交联，采用循环伏安法、旋转圆盘电极和注射分析研究了CHIT、CHIT-LYVS、CHIT-LYVS-GDI等聚合物结构的离子传输和离子交换性能。结果表明，壳聚糖基质支持快速离子传输，Ru(NH3)(6)（3+）和多巴胺在膜中的表观扩散系数呈水样值。阴离子LYVS染料引入了对阴离子(如Fe(CN)（6)(4-)，抗坏血酸）的透选择性到CHIT-LYVS薄膜中。这种膜与GDI的交联进一步提高了膜的选择性和稳定性。本文讨论了CHIT-LYVS-GDI膜在高水合壳聚糖基质中具有高选择性和快速离子传输的独特组合。结果表明，化学改性壳聚糖是开发快速、选择性和可逆性传感器的一种有吸引力的新涂层。
Thin films of a biopolymer chitosan (CHIT) were cast on glassy carbon electrodes, modified by grafting Lucifer Yellow VS dye (LYVS) onto chitosan chains, and crosslinked with glutaric dialdehyde (GDI), The ion-transport and ion-exchange properties of such polymeric structures (CHIT, CHIT-LYVS, CHIT-LYVS-GDI) were studied using cyclic voltammetry, rotating disk electrode, and now injection analysis. The results showed that the chitosan matrix supported a fast ion transport as demonstrated by aqueous-like values of the apparent diffusion coefficients of Ru(NH3)(6)(3+) and dopamine in the films. Anionic LYVS dye introduced a permselectivity against anions (e.g., Fe(CN)(6)(4-), ascorbate) into the CHIT-LYVS films. The cross-linking of such films with GDI further increased their permselectivity as well as their stability. A unique combination of high permselectivity and fast ion transport in the CHIT-LYVS-GDI films is discussed in terms of the mixed-transport mechanism involving both pore and membrane diffusion in a highly hydrated chitosan matrix. The results indicate that the chemically modified chitosan is an attractive new coating for the development of fast, selective, and reversible sensors.