A vitamin B1 sensitive poly(vinyl chloride) membrane electrode based on hydrophobic tetraphenyiborate derivatives is described. The sensing membrane contains an ion pair of vitamin B1-tetrakis[3, 5-bis(2-methoxyhexafluoro-2-propyl)-phenyl] borate (HFPB) or -tetrakis[3, 5-bis(trifluoromethyl)-phenyl] borate (TFPB) as a novel electroactive component, and it is plasticized with o-nitrophenyl octyl ether. The electrodes based on HFPB and TFPB exhibit Nernstian response down to 10−7.5 and 10−7 M vitamin B1 at pH 4, respectively. Response time is 5–10s for Increasing concentrations of sample solutions. Interferences from common Inorganic cations, some organic acids, and conventional dopes in oral solutions are negligible. The vitamin B1 electrode is successfully applied to the determination of vitamin B1 contents In an oral solution for both batch and flow infection systems. The results show good correlation with those obtained by conventional HPLC-UV detection with a coefficient of correlation of 0.99.
All Science Journal Classification (ASJC) codes
- Analytical Chemistry