Ibrahim W.A.W.,Separation Science and Technology Group SepSTec |
Ibrahim W.A.W.,University of Technology Malaysia |
Ibrahim W.A.W.,Ibnu Sina Institute for Fundamental Science Studies |
Arsad S.R.,Separation Science and Technology Group SepSTec |
And 9 more authors.
Chirality | Year: 2015
This work aimed to develop a chiral separation method of ketoconazole enantiomers using electrokinetic chromatography. The separation was achieved using heptakis (2, 3, 6- tri-O-methyl)-β-cyclodextrin (TMβCD), a commonly used chiral selector (CS), as it is relatively inexpensive and has a low UV absorbance in addition to an anionic surfactant, sodium dodecyl sulfate (SDS). The influence of TMβCD concentration, phosphate buffer concentration, SDS concentration, buffer pH, and applied voltage were investigated. The optimum conditions for chiral separation of ketoconazole was achieved using 10mM phosphate buffer at pH2.5 containing 20mM TMβCD, 5mM SDS, and 1.0% (v/v) methanol with an applied voltage of 25 kV at 25 °C with a 5-s injection time (hydrodynamic injection). The four ketoconazole stereoisomers were successfully resolved for the first time within 17 min (total analysis time was 28 min including capillary conditioning). The migration time precision of this method was examined to give repeatability and reproducibility with RSDs ≤5.80% (n =3) and RSDs ≤8.88% (n =9), respectively. © 2014 Wiley Periodicals, Inc.