title: Rapid determination of pseudoephedrine in human plasma by high-performance liquid chromatography.
abstract: A rapid high-performance liquid chromatographic method for the quantitation of pseudoephedrine in human plasma is presented. The sample preparation involved liquid-liquid extraction of pseudoephedrine from alkalised plasma with hexane-isoamylalcohol (9:1, v/v) and back-extraction of the drug to 0.02 M hydrochloric acid. Liquid chromatography was performed on an octadecylsilica column (50 x 4 mm, 5 microm particles); the mobile phase consisted of acetonitrile-phosphate buffer containing 0.1% of triethylamine, pH 2.4 (5:95, v/v). The run time was 4 min. The spectrophotometric detector was operated at 195 nm. Codeine was used as the internal standard. The limit of quantitation was 5.8 ng/ml using 0.5 ml of plasma. Within-day and between-day precision expressed by relative standard deviation was less than 7% and inaccuracy did not exceed 8%. The assay was applied to the analysis of samples from a pharmacokinetic study.
authors.affiliation: Pharmakl spol sro, Laboratory and Clinical Facility, Prague, Czech Republic. pharmakl@mbox.vol.cz
authors.forename: J
authors.initials: J
authors.lastname: Macek
authors.forename: P
authors.initials: P
authors.lastname: Ptáek
authors.forename: J
authors.initials: J
authors.lastname: Klíma
mesh_terms: D002138:Calibration; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D004809:Ephedrine / Q000097:blood*; D006801:Humans; D012015:Reference Standards; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013056:Spectrophotometry, Ultraviolet
chemical_list: D004809:Ephedrine