title: Direct high-performance liquid chromatographic determination of (R)- and (S)-propranolol in rat microdialysate using on-line column switching procedures.
abstract: Two different column-switching HPLC systems (CSWs), employing restricted access material for initial pretreatment of biological samples, were developed for the determination of propranolol enantiomers in microdialysate. CSW 1 was a single-pump set-up based on an initial sample clean-up step with a RP-18 ADS precolumn coupled with an ovomucoid analytical column for direct drug enantioseparation. For the two-pump column set-up (CSW 2), a teicoplanin analytical column was applied for the enantioselective assay after initial sample pretreatment using a RP-8 ADS precolumn. The inter-day precision of the CSW 1 ranged from 0.5 to 5.1% for (R)-propranolol and from 5.1 to 10.5% for (S)-propranolol. The limit of detection (LOD) was set at 10 ng/ml and 15 ng/ml for (R)- and (S)-propranolol, respectively. Inter-day relative standard deviation values of the CSW 2 ranged from 1.1 to 9.9% for (R)-propranolol and from 1.3 to 9.6% for (S)-propranolol. The LOD of the method was 3.0 ng/ml for (R)-propranolol and 2.5 ng/ml for (S)-propranolol. Both approaches were successfully applied for stereoselective monitoring of unbound propranolol levels in rat microdialysates.
authors.affiliation: Institute of Preventive and Clinical Medicine, Bratislava, Slovak Republic.
authors.forename: C
authors.initials: C
authors.lastname: Mislanová
authors.forename: A
authors.initials: A
authors.lastname: Stefancová
authors.forename: J
authors.initials: J
authors.lastname: Oravcová
authors.forename: J
authors.initials: J
authors.lastname: Horecký
authors.forename: T
authors.initials: T
authors.lastname: Trnovec
authors.forename: W
authors.initials: W
authors.lastname: Lindner
mesh_terms: D000319:Adrenergic beta-Antagonists / Q000032:analysis; D000818:Animals; D002851:Chromatography, High Pressure Liquid / Q000295:instrumentation / Q000379:methods*; D008297:Male; D017551:Microdialysis; D011433:Propranolol / Q000032:analysis*; D051381:Rats; D017208:Rats, Wistar; D015203:Reproducibility of Results; D013237:Stereoisomerism
chemical_list: D000319:Adrenergic beta-Antagonists; D011433:Propranolol