Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Studies of Polymer Matrix Effect for Coextraction Type Anion-Selective Optode and Determination of Thiocyanate in Human Saliva

  • Published : 1994.10.20
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Abstract

The polymer matrix effect on the selectivity, response rate and reproducibility for coextraction type anion-selective optode membranes were investigated with DOA-plasticized PVC, PVC/hydroxylated PVC, PU/hydroxylated PVC and DOS-plasticized CTA matrices. Optode membranes were prepared with TDMACl and ETH2412 dissolved in one of the four solvent polymeric matrices. The PU/hydroxylated PVC and PVC-based membranes have almost the same selectivity coefficients, while the CTA-based membrane is more selective toward lipophilic anions. The membrane with PU/hydroxylated PVC adhered strongly to a glass surface, and showed highly reproducible and relatively rapid response. Very poor adhesion of PVC/hydroxylated PVC and CTA-based membranes limited the usability of those membranes as sensor components. Based on these results, and considering the biocompatibility for clinical samples, the optode made with PU/hydroxylated PVC was applied to determine the thiocyanate ion in human saliva. The results obtained with this simple device were comparable to those with rather complicated ISE methods.

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  1. Opto-Chemical and Opto-Immuno Sensors vol.1, pp.1, 1994, https://doi.org/10.1002/1616-8984(199607)1:1<1::aid-seup1>3.0.co;2-6
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