title: Determination of clemastine in human plasma by gas chromatography with nitrogen-phosphorus detection.
abstract: A method for the quantitative determination of clemastine in human plasma has been developed and validated. The assay uses gas chromatography with nitrogen-phosphorus detection and a HP-1 capillary column (25 mx0.22 mm, film thickness 0.33 mm) coated with dimethylpolysiloxane. Clemastine (with orphenadrine as internal standard) was isolated from human plasma using liquid-liquid extraction. A linear relationship was observed between 0.1 and 12.8 ng/ml using the peak area ratio of clemastine to orphenadrine with a correlation coefficient greater than 0.99 (the detection limit for clemastine was 0.06 ng/ml). The intra- and inter-day coefficients of variation were less than 11%. The developed method was used for the analysis of plasma samples from healthy volunteers (n = 19) to examine the pharmacokinetics of the antihistamine clemastine after single and multiple oral doses of clemastine fumarate.
authors.affiliation: Department of Pharmacology, School of Medicine, Georgetown University, Washington, DC 20007, USA.
authors.forename: N N
authors.initials: NN
authors.lastname: Davydova
authors.forename: S U
authors.initials: SU
authors.lastname: Yasuda
authors.forename: R L
authors.initials: RL
authors.lastname: Woosley
authors.forename: I W
authors.initials: IW
authors.lastname: Wainer
mesh_terms: D000328:Adult; D018926:Anti-Allergic Agents / Q000097:blood*; D002849:Chromatography, Gas / Q000379:methods*; D002974:Clemastine / Q000097:blood*; D004355:Drug Stability; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009584:Nitrogen / Q000737:chemistry; D010758:Phosphorus / Q000737:chemistry; D015203:Reproducibility of Results
chemical_list: D018926:Anti-Allergic Agents; D010758:Phosphorus; D002974:Clemastine; D009584:Nitrogen