Sensitive high-performance liquid chromatographic method for the determination of labetalol diastereoisomers in plasma samples without derivatization.
A direct high-performance liquid chromatographic assay for the determination of labetalol diastereoisomers in plasma without derivatization was developed. Baseline resolution of diastereoisomers was accomplished on a C18 bonded reversed-phase polymeric column with a basic (pH 11.5) mobile phase and isocratic elution. Sample treatment was optimized in order to achieve a complete extraction of labetalol diastereoisomers and to avoid racemization during extraction. Fluorimetric detection improved the selectivity and afforded a detection limit of 3 ng/ml for each diastereoisomer. This method is suitable for routine quantification of labetalol diastereoisomers and has been applied to a pharmacokinetic study in small laboratory animals.
Pharmacokinetic and Clinical Pharmacy Laboratory, Haut-Lévèque Hospital and University of Bordeaux II, Pessac, France.
J
J
Grellet
P
P
Michel-Gueroult
D
D
Ducint
M C
MC
Saux
D000818:Animals; D002851:Chromatography, High Pressure Liquid; D006863:Hydrogen-Ion Concentration; D007275:Injections, Intravenous; D007741:Labetalol / Q000097:blood* / Q000493:pharmacokinetics; D008297:Male; D051381:Rats; D017207:Rats, Sprague-Dawley; D013050:Spectrometry, Fluorescence; D013237:Stereoisomerism
D007741:Labetalol