Potentiometric sensors based on lipophilic alkylated cyclodextrins exhibit a good response to the guanidinium ion, with higher selectivity over sodium than previously reported ionophores; 2,6-didodecyl-β-cyclodextrin has also been shown to exhibit selective response to the guanidine derivatives metformin and phenformin in a simulated clinical electrolyte background.
R. Kataky, P. M. Kelly, D. Parker and A. F. Patti, J. Chem. Soc., Perkin Trans. 2, 1994, 2381 DOI: 10.1039/P29940002381
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