Selective sensing of guanidinium and tetraalkylammonium ions using lipophilic cyclodextrins
Abstract
A range of lipophic cyclodextrin derivatives, including 2,6-didodecyl-α-and-β-cyclodextrins, and 2,3,6-tri-O-ethyl-β-cyclodextrin, has been exmined as ionophores in electrode response studies of the detection of guanidine, alkylated guanidines, creatinine and several tetraalkylammonium ions including choline, acetylcholine and the long-chain cationic surfactants CnH2n+1NMe3+(n= 8 → 16). Interference from Group Ia and IIa cations is minimal for alkylammonium ions (–log kpot > 4 typically) and in certain cases binding of the ion has been further defined by electrospray mass sectrometric and NMR methods.
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