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Fast enantiomeric separation of uniconazole and diniconazole by electrokinetic chromatography using an anionic cyclodextrin: application to the determination of analyte-selector apparent binding constants for enantiomers

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Authors
Martín Biosca, Yolanda; García Ruiz, CarmenUniversity of Alcalá Author; Marina Alegre, María LuisaUniversity of Alcalá Author
Identifiers
Permanent link (URI): http://hdl.handle.net/10017/1366
DOI: 10.1002/1522-2683(20000901)21:15<3240::AID-ELPS3240>3.0.CO;2-T
ISSN: 0173-0835
Publisher
John Wiley & Sons
Date
2000
Affiliation
Universidad de Alcalá. Departamento de Química Analítica e Ingeniería Química
Bibliographic citation
Electrophoresis, 2000, v. 21, p. 3240-3248
Keywords
Uniconazole
Diniconazole
Electrokinetic chromatography
Project
07M-0049/1998 (Comunidad de Madrid)
Document type
info:eu-repo/semantics/article
Version
info:eu-repo/semantics/publishedVersion
Publisher's version
http://dx.doi.org/10.1002/1522-2683(20000901)21:15<3240::AID-ELPS3240>3.0.CO;2-T
Rights
(c) WILEY-VCH, 2000
Access rights
info:eu-repo/semantics/openAccess
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Abstract
The enantiomeric resolution of the fungicides uniconazole and diniconazole was performed using electrokinetic chromatography with cyclodextrins as pseudostationary phase (CD-EKC). A systematic evaluation of several chiral selectors was made. The anionic derivative carboxymethylated-gamma-cyclodextrin (CM-gamma-CD) was found to be the most appropriate for the enantioseparation of fungicides among all cyclodextrins tested. The influence of some experimental conditions such as nature and buffer pH, chiral selector concentration, and temperature on the enantiomeric separation of the compounds studied was also investigated. The use of a 50 mM phosphate buffer (pH 6.5) containing 5 mM CM-gamma-CD and a temperature of 50 degrees C enabled the baseline enantioresolution of mixtures of uniconazole and diniconazole in less than 5 min. In addition, apparent binding constants for each enantiomer-CM-gamma-CD pair at several temperatures, as well as thermodynamic parameters for binding were calculated.
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