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N. V. Shvedene, A. V. Rzhevskaia, I. V. Pletnev
Solid-state
ion-selective electrodes based on ionic liquid solidified at room temperature
for the determination of amino acids
Abstract
Solid-state ion-selective electrode (ISE) based on ionic liquid (IL)
tetraoctylammonium N-lauroyl sarcosinate for the determination of anionic forms
of amino acids is reported. Preconditioning in copper sulfate solution and
using of more infusible and hydrophobic IL 1,3-dihexadecylimidazolium bromide
allowed to lower limit of detection of phenylalanine in several times (Cmin
= 2,7·10–5M) and significantly improve operational resource of
the sensor. Tetraoctylammonium N-lauroyl sarcosinate and
1,3-dihexadecylimidazolium bromide are solid at room temperature. Thus, the
possibility of using two ILs for creation of solid-state ISE, where one of them
is used as inert solid matrix for the immobilization of the second IL, which
provides the binding of the analyte and the formation of potentiometric signal,
is showed.
Key words: solid-state
ion-selective electrodes, ionic liquids, determination of amino acids.
Copyright (C) Chemistry Dept., Moscow State University, 2002
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