NEAR-INFRARED FLUORESCENCE PROBE FOR PH DETERMINATION
NEAR-INFRARED FLUORESCENCE PROBE FOR PH DETERMINATION
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DOI：
10.1021/ac00024a024
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发表时间：
1991-12-15
影响因子：
7.4
通讯作者：
PATONAY, G
中科院分区：
文献类型：
--
作者：
ZEN, JM;PATONAY, G
Nafion 是一种全氟磺化离子交换聚合物，已被评估为固定近红外吸收荧光团以确定溶液 pH 值的底物。 经过简单的制备程序，具有 pH 敏感官能团（双（羧酸）衍生物）的花青染料被捕获在 Nafion 基质中并制成薄膜。 薄膜探针的制造为该方法提供了更大的通用性。 这种染料在 Nafion 基质内表现出极大的稳定性，并具有相对较长的吸收和荧光波长，使研究人员能够利用该区域的较低干扰。 由于研究系统在水溶液中的最大吸收约为 800 nm，因此可以使用半导体激光器。 研究中阐述了这种方法的可行性，并评估了近红外激光二极管用于 pH 测定的分析效用。
Nafion, a perfluorosulfonated ion-exchange polymer, has been evaluated as a substrate for immobilizing a near-infrared absorbing fluorophore to determine pH in solutions. Following simple preparation procedures a cyanine dye with a pH-sensitive functional group (a bis(carboxylic acid) derivative) was entrapped within the Nafion matrix and fabricated into thin film. The fabrication of a thin-film probe gives greater versatility for the method. This dye exhibits great stability inside the Nafion matrix and has relatively long absorption and fluorescence wavelengths which allow researchers to utilize the lower interference of this region. Since the absorption maximum of the study system is around 800 nm in aqueous solutions, semiconductor lasers can be used. In the study the feasibility of this approach was illustrated and the analytical utility of near-infrared laser diodes for pH determination was evaluated.