title: Measurement of plasma ibuprofen by gas chromatography-mass spectrometry.
abstract: A gas-chromatography-mass spectrometry (GC-MS) method for the determination of plasma ibuprofen was developed. Plasma samples from cystic fibrosis (CF) patients receiving high-dose ibuprofen therapy were analyzed by GC-MS and the result compared to analysis by high-performance liquid chromatography (reference method). Analysis of ibuprofen was sensitive to at least 5 mg/L, and the method was linear to 200 mg/L. Within-run variations of plasma samples were 4.6% (131.7 +/- 6.0 mg/L) and 5.4% (44.4 +/- 2.4 mg/L), respectively. The between-run variation was 9.3% (45.4 +/- 4.2 mg/L) and 7.4% (88.0 +/- 6.5 mg/L). This method is suited for routine clinical use for the monitoring of plasma ibuprofen levels in treatment of CF. It may be particularly applicable in pediatric laboratories, which are likely to possess GC-MS capability.
authors.affiliation: Department of Pathology, Washington University School of Medicine, St. Louis, MO 63110, USA.
authors.forename: B A
authors.initials: BA
authors.lastname: Way
authors.forename: T R
authors.initials: TR
authors.lastname: Wilhite
authors.forename: C H
authors.initials: CH
authors.lastname: Smith
authors.forename: M
authors.initials: M
authors.lastname: Landt
mesh_terms: D002851:Chromatography, High Pressure Liquid; D003550:Cystic Fibrosis / Q000188:drug therapy; D016903:Drug Monitoring; D005279:Fenoprofen / Q000097:blood; D008401:Gas Chromatography-Mass Spectrometry / Q000706:statistics & numerical data; D006801:Humans; D007052:Ibuprofen / Q000097:blood* / Q000627:therapeutic use; D007660:Ketoprofen / Q000097:blood; D009288:Naproxen / Q000097:blood; D012680:Sensitivity and Specificity
chemical_list: D009288:Naproxen; D007660:Ketoprofen; D005279:Fenoprofen; D007052:Ibuprofen