title: High performance capillary electrophoresis for determination of the enantiomers of 2-arylpropionic acid derivatives in human serum. Pharmacokinetic studies of ketoprofen enantiomers following administration of standard and sustained release tablets.
abstract: A stereospecific capillary zone electrophoresis (CZE) method for determination of the enantiomers of some 2-arylpropionic acid derivatives (2-APA, profens) in human serum has been developed. Racemic-ibuprofen (rac-IBP), racemic-flurbiprofen (rac-FBP), racemic-ketoprofen (rac-KTP) and (+)-S-naproxen ((+)-S-NPX--an internal standard) were chosen for these studies. The 2-APA enantiomers were extracted from acidified serum samples using methylene chloride separated in a fused silica capillary. The capillary was filled with a background electrolyte, which consisted of 0.05 M heptakis 2,3,6-tri-O-methyl-beta-cyclodextrin (TMbetaCD) (chiral selector) in 0.02 M triethanolamine-phosphate buffer of pH 5.0. Separation and resolution of the enantiomer mixture were obtained in one analytical run. The calculated electrophoretic parameters of the analytes were as follows: electrophoretic mobility, micorep(-)-R = -0.75 x 10(-4) to -0.30 x 10(-4) cm2/Vs; micorep(+)-S = -0.83 -(-0.38) cm2/Vs and electroosmotic mobility, microEOF = 2.35 x 10(-4) cm2/Vs, migration times, tmigr R = 12.55 - 16.07 min; tmigr s = 13.08 - 16.9 min, resolution factors, RS = 1.88 - 3.70 and chiral selectivity, alpha = 1.16 - 1.34. The method developed for the enantiomers was validated. The calibration curves were linear in the range of 0.5-50.0 microg/ml for FBP or KTP and of 1.0-50.0 microg/ml for IBP enantiomer concentrations. Recovery of the enantiomers from serum was about 90%. At the limit of quantification (LOQ) precision and accuracy were within 15%. The validated method was successfully applied to pharmacokinetic and bioavailability studies on KTP enantiomers in humans after administration of standard and sustained release tablets of rac-KTP. Significant differences in the pharmacokinetic parameters of both formulations were observed and the studied formulations were not bioequivalent.
authors.affiliation: Department of Physical Pharmacy and Pharmacokinetics, University of Medical Sciences, 6, Swiecickiego Street, 60-781 Poznań, Poland. glowka@amp.edu.pl
authors.forename: Franciszek K
authors.initials: FK
authors.lastname: Główka
authors.forename: Marta
authors.initials: M
authors.lastname: Karaźniewicz
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D003692:Delayed-Action Preparations / Q000008:administration & dosage / Q000493:pharmacokinetics; D019075:Electrophoresis, Capillary / Q000379:methods; D005260:Female; D006801:Humans; D007660:Ketoprofen / Q000008:administration & dosage / Q000493:pharmacokinetics*; D008297:Male; D008875:Middle Aged; D011422:Propionates / Q000097:blood* / Q000737:chemistry*; D013237:Stereoisomerism; D013607:Tablets
chemical_list: D003692:Delayed-Action Preparations; D011422:Propionates; D013607:Tablets; D007660:Ketoprofen; C029658:propionic acid