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Enantioseparation of new nucleoside analogs, related to d4T and acyclovir, by chiral capillary electrophoresis using highly sulfated β‐cyclodextrins
Author(s) -
Lipka Emmanuelle,
Daniel Cecile,
Vaccher MariePierre,
Glaçon Virginie,
Ewing David,
Mackenzie Graham,
Len Christophe,
Bonte JeanPaul,
Vaccher Claude
Publication year - 2004
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.200305706
Subject(s) - enantiomer , capillary electrophoresis , chemistry , cyclodextrin , chromatography , detection limit , resolution (logic) , sulfation , stereochemistry , biochemistry , artificial intelligence , computer science
Baseline separation of some new acyclic nucleosides which are potential antiviral agents was achieved using cyclodextrin capillary zone electrophoresis (CD‐CZE). A method for the enantiomeric resolution of these compounds and determination of their enantiomeric purity was developed using anionic CDs (highly sulfated‐CD or highly S‐CD) as chiral selectors and capillaries, which were dynamically coated with polyethylene oxide (PEO). Operational parameters including (i) the nature and concentration of the chiral selectors, (ii) organic modifiers, (iii) temperature, and (iv) applied voltage were investigated. The use of charged CDs provides (i) a supplementary driving force for the compounds in a running buffer and (ii) enantiomeric resolution by inclusion of compounds in the CD cavity. The highly S‐CD was found to be the most effective complexing agent and allowed good enantiomeric resolution. The complete resolution of five nucleoside analogs was obtained using 25 m M phosphate buffer, pH 2.5, containing either highly S‐α‐CD, S‐β‐CD or S‐γ‐CD at 30°C with an applied field of 0.30 kV/cm. The apparent association constants of the inclusion complexes were calculated. The enantiomer migration order for the molecules investigated was determined and the detection limit of enantiomeric impurities was found to vary between 0.34 to 3.56 ng·mL −1 for the first enantiomer.