title: Rapid determination of tafenoquine in small volume human plasma samples by high-performance liquid chromatography-tandem mass spectrometry.
abstract: A method was developed for the determination of tafenoquine (I) in human plasma using high-performance liquid chromatography-tandem mass spectrometry. Prior to analysis, the protein in plasma samples was precipitated with methanol containing [2H3(15N)]tafenoquine (II) to act as an internal standard. The supernatant was injected onto a Genesis-C18 column without any further clean-up. The mass spectrometer was operated in the positive ion mode, employing a heat assisted nebulisation, electrospray interface. Ions were detected in multiple reaction monitoring mode. The assay required 50 microl of plasma and was precise and accurate within the range 2 to 500 ng/ml. The average within-run and between-run relative standard deviations were < 7% at 2 ng/ml and greater concentrations. The average accuracy of validation standards was generally within +/- 4% of the nominal concentration. There was no evidence of instability of I in human plasma following three complete freeze-thaw cycles and samples can safely be stored for at least 8 months at approximately -70 degrees C. The method was very robust and has been successfully applied to the analysis of clinical samples from patients and healthy volunteers dosed with I.
authors.affiliation: Worldwide Bioanalysis, GlaxoSmithKline, The Frythe, Welwyn, Hertfordshire, UK. Edward_Doyle@SBPHRD.com
authors.forename: E
authors.initials: E
authors.lastname: Doyle
authors.forename: S E
authors.initials: SE
authors.lastname: Fowles
authors.forename: S
authors.initials: S
authors.lastname: Summerfield
authors.forename: T J
authors.initials: TJ
authors.lastname: White
mesh_terms: D000634:Aminoquinolines / Q000097:blood*; D000962:Antimalarials / Q000097:blood*; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D006801:Humans; D013058:Mass Spectrometry / Q000379:methods*; D012015:Reference Standards; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: D000634:Aminoquinolines; D000962:Antimalarials; C055852:tafenoquine