title: Simultaneous determination of HIV protease inhibitors amprenavir, atazanavir, indinavir, lopinavir, nelfinavir, ritonavir and saquinavir in human plasma by high-performance liquid chromatography-tandem mass spectrometry.
abstract: We report a precise and accurate method for simultaneous quantification of protease inhibitors (PIs) amprenavir, atazanavir, indinavir, lopinavir, nelfinavir, ritonavir and saquinavir in plasma. An internal standard was added to samples prior to protein precipitation with acetonitrile followed by addition of ammonium formate buffer. Analysis was by HPLC-MS/MS. Calibration curves were validated over concentration ranges encompassing both subtherapeutic and potentially 'toxic' drug concentrations. Inter- and intra-assay variation were below 11% and PI recovery was above 87%. The bioanalytical method described is successfully applied to measure PI concentrations obtained from clinical pharmacokinetic studies and routine therapeutic drug monitoring (TDM).
authors.affiliation: Department of Pharmacology, University of Liverpool, Pharmacology Research Laboratories, Block H, First Floor, 70 Pembroke Place, Liverpool L69 3GF, UK. laurad@liv.ac.uk
authors.forename: Laura
authors.initials: L
authors.lastname: Dickinson
authors.forename: Lesley
authors.initials: L
authors.lastname: Robinson
authors.forename: John
authors.initials: J
authors.lastname: Tjia
authors.forename: Saye
authors.initials: S
authors.lastname: Khoo
authors.forename: David
authors.initials: D
authors.lastname: Back
mesh_terms: D002138:Calibration; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D017320:HIV Protease Inhibitors / Q000097:blood* / Q000145:classification / Q000493:pharmacokinetics; D006801:Humans; D013058:Mass Spectrometry / Q000379:methods*; D012015:Reference Standards; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: D017320:HIV Protease Inhibitors