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Use of chiral amino acid ester‐based ionic liquids as chiral selectors in CE
Author(s) -
Stavrou Ioannis J.,
KapnissiChristodoulou Constantina P.
Publication year - 2013
Publication title -
electrophoresis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.666
H-Index - 158
eISSN - 1522-2683
pISSN - 0173-0835
DOI - 10.1002/elps.201200469
Subject(s) - enantiomer , chemistry , analyte , chiral derivatizing agent , ionic liquid , alkyl , tris , chromatography , resolution (logic) , amino acid , chiral column chromatography , organic chemistry , catalysis , biochemistry , artificial intelligence , computer science
In this study, the applicability of a chiral ionic liquid ( CIL ) as the sole chiral selector in CE was investigated for the first time. In particular, five amino acid ester‐based CIL s were synthesized and used as additives in the BGE in order to evaluate their chiral recognition ability. The performance of these CIL s as the sole chiral selectors was evaluated by using 1,1′‐binaphthyl‐2,2‐diylhydrogenphosphate ( BNP ) as the analyte and by comparing the resolution values. Different parameters were examined, such as the alkyl group bulkiness and the configuration of the cation, the anion type of the CIL and its concentration, and the pH of the BGE , in order to optimize the separation of the enantiomers and to demonstrate the effect that each parameter has on the chiral‐recognition ability of the CIL. Baseline separation of BNP within 13 min was achieved by using a BGE of 100 mM T ris/10 mM sodium tetraboratedecahydrate (pH 8) and a chiral selector of 60 mM l ‐alanine tert butyl ester lactate. The run‐to‐run and batch‐to‐batch reproducibilities were also evaluated by computing the % RSD values of the EOF and the two enantiomer peaks. In both cases, very good reproducibilities were observed, since all % RSD values were below 1%.