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Neutral-Carrier-Type Potassium Ion-Selective Electrodes Based on Polymer-supported Liquid-Crystal Membranes for Practical Use

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Abstract

Polymer-supported liquid-crystal membranes have been designed for neutral-carrier-type potassium ion-selective electrodes, aiming for practical applications of high-performance liquid-crystalline membrane ion sensors. Two types of polymer-supported liquid-crystal membranes were tested for their usefulness; one is microporous poly(tetra fluoroethylene) (PTFE) membranes impregnated by thermotropic liquid-crystalline compounds, and another is poly(methyl methacrylate) (PMMA) membrane dispersing the same liquid-crystalline compounds. Both of the polymer-supported liquid-crystal membranes containing a liquid-crystalline benzo-15-crown-5 neutral carrier as well as a lipophilic anion excluder work well as ion-sensing membranes for potassium ion-selective electrodes, the ion selectivities of which can be switched by the measurement temperatures. Specifically, PTFE-impregnated liquid-crystal membranes are better than the PMMA-dispersed ones in the sensitivity and selectivity of the resulting ion electrodes. A potassium ion assay in blood sera has proved that neutral-carrier-type ion-selective electrodes based on the polymer-supported liquid-crystal membranes are reliable for practical uses.

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Authors and Affiliations

  1. Department of Applied Chemistry, Faculty of Systems Engineering, Wakayama University, Sakaedani 930, Wakayama, Wakayama, 640-8510, Japan

    Syusuke Oosaki, Yoshikazu Kawai, Setsuko Yajima & Keiichi Kimura

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  1. Syusuke Oosaki
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  2. Yoshikazu Kawai
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  3. Setsuko Yajima
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  4. Keiichi Kimura
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Correspondence to Keiichi Kimura.

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Oosaki, S., Kawai, Y., Yajima, S. et al. Neutral-Carrier-Type Potassium Ion-Selective Electrodes Based on Polymer-supported Liquid-Crystal Membranes for Practical Use. ANAL. SCI. 20, 1165–1170 (2004). https://doi.org/10.2116/analsci.20.1165

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  • DOI: https://doi.org/10.2116/analsci.20.1165

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