title: Dynamic coating for fast and reproducible determination of basic drugs by capillary electrophoresis with diode-array detection and mass spectrometry.
abstract: The double coating principle of CEofix buffers was evaluated for the analysis of some basic drugs by capillary electrophoresis-diode-array detection (CE-DAD) and capillary electrophoresis-mass spectrometry (CE-MS). The involatile phosphate present in original low pH CEofix, was replaced with formic acid for hyphenation of CE with MS. The double coating produces a substantial and highly reproducible electroosmotic flow (EOF), even at low pH. The rinsing procedure and electrolyte composition were optimized for both CE-DAD and CE-MS. The system was evaluated with the analysis of a mixture of basic drugs and a spiked urine sample enriched by solid-phase extraction (SPE). The R.S.D. values on the migration time and peak area measured for 28 analyses with CE-DAD were below 0.25 and 2.40%, respectively. For CE-MS, the R.S.D. on the migration time was 0.85% or less and the area precision ranged from 5.65 to 14.33% (for seven injections). The LOD with the developed CE-MS method was below 50 ppb for all five drug standards tested.
authors.affiliation: Laboratory of Separation Sciences, Department of Organic Chemistry, Faculty of Sciences, Ghent University, Krijgslaan 281 (S4), B-9000 Gent, Belgium.
authors.forename: Gerd
authors.initials: G
authors.lastname: Vanhoenacker
authors.forename: François
authors.initials: F
authors.lastname: de l'Escaille
authors.forename: Denis
authors.initials: D
authors.lastname: De Keukeleire
authors.forename: Pat
authors.initials: P
authors.lastname: Sandra
mesh_terms: D019075:Electrophoresis, Capillary / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D013058:Mass Spectrometry / Q000379:methods*; D004364:Pharmaceutical Preparations / Q000302:isolation & purification* / Q000652:urine; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: D004364:Pharmaceutical Preparations