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S,S,S-Tris(2-ethylhexyl) phosphorotrithioate as an effective solvent mediator for a mexiletine-sensitive membrane electrode

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Abstract

S,S,S-Tris(2-ethylhexyl) phosphorotrithioate proved to be an effective solvent mediator for constructing a mexiletine-sensitive membrane electrode in combination with an ion-exchanger, sodium tetrakis[3,5-bis(2-methoxyhexafluoro-2-propyl)phenyl]borate. Among a series of phosphorus compounds containing phosphoryl (P=O) groups, this solvent mediator showed the highest sensitivity to mexiletine in phosphate-buffered physiological saline containing 0.15 mol L−1 NaCl and 0.01 mol L−1 NaH2PO4/Na2HPO4 (pH 7.4), giving a detection limit of 2 × 10−6 mol L−1 with a slope of 58.8 mV decade−1. This is the best reported detection limit of any mexiletine-sensitive electrode developed to date. Owing to its high selectivity toward inorganic cations, the electrode was used to determine the level of mexiletine in saliva, the monitoring of which is quite effective for controlling the dose of this drug noninvasively. The mexiletine concentrations determined with the mexiletine-sensitive electrode compared favorably with those determined by high-performance liquid chromatography.

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Acknowledgements

This work was supported by a Grant-in-Aid for Scientific Research (KAKENHI 16590027) from the Japan Society for the Promotion of Science.

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Authors and Affiliations

  1. Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Tsushima, Okayama, 700-8530, Japan

    Takashi Katsu, Yumi Tsunamoto, Nobumitsu Hanioka, Keiko Komagoe, Kazufumi Masuda & Shizuo Narimatsu

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  1. Takashi Katsu
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  2. Yumi Tsunamoto
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  3. Nobumitsu Hanioka
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  4. Keiko Komagoe
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  5. Kazufumi Masuda
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  6. Shizuo Narimatsu
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Correspondence to Takashi Katsu.

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Katsu, T., Tsunamoto, Y., Hanioka, N. et al. S,S,S-Tris(2-ethylhexyl) phosphorotrithioate as an effective solvent mediator for a mexiletine-sensitive membrane electrode. Anal Bioanal Chem 387, 2057–2064 (2007). https://doi.org/10.1007/s00216-006-1105-y

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  • DOI: https://doi.org/10.1007/s00216-006-1105-y

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