title: Enantioseparation of new nucleoside analogs, related to d4T and acyclovir, by chiral capillary electrophoresis using highly sulfated beta-cyclodextrins.
abstract: 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 mM phosphate buffer, pH 2.5, containing either highly S-alpha-CD, S-beta-CD or S-gamma-CD at 30 degrees 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.
authors.affiliation: Laboratoire de Chimie Analytique, Faculté des Sciences Pharmaceutiques et Biologiques, Université de Lille 2, Lille, France.
authors.forename: Emmanuelle
authors.initials: E
authors.lastname: Lipka
authors.forename: Cecile
authors.initials: C
authors.lastname: Daniel
authors.forename: Marie-Pierre
authors.initials: MP
authors.lastname: Vaccher
authors.forename: Virginie
authors.initials: V
authors.lastname: Glaçon
authors.forename: David
authors.initials: D
authors.lastname: Ewing
authors.forename: Graham
authors.initials: G
authors.lastname: Mackenzie
authors.forename: Christophe
authors.initials: C
authors.lastname: Len
authors.forename: Jean-Paul
authors.initials: JP
authors.lastname: Bonte
authors.forename: Claude
authors.initials: C
authors.lastname: Vaccher
mesh_terms: D000212:Acyclovir / Q000031:analogs & derivatives / Q000302:isolation & purification; D019380:Anti-HIV Agents / Q000302:isolation & purification*; D003505:Cyclodextrins; D019075:Electrophoresis, Capillary / Q000379:methods* / Q000592:standards; D009705:Nucleosides / Q000302:isolation & purification*; D018119:Stavudine / Q000031:analogs & derivatives / Q000302:isolation & purification; D013237:Stereoisomerism; D013431:Sulfates; D047392:beta-Cyclodextrins
chemical_list: D019380:Anti-HIV Agents; D003505:Cyclodextrins; D009705:Nucleosides; D013431:Sulfates; D047392:beta-Cyclodextrins; D018119:Stavudine; C031215:betadex; D000212:Acyclovir