title: High-performance liquid chromatographic method for the simultaneous determination of HIV-1 protease inhibitors indinavir, saquinavir and ritonavir in plasma of patients during highly active antiretroviral therapy.
abstract: A new high-performance liquid chromatographic method for the simultaneous determination of indinavir, saquinavir and ritonavir in human plasma is described. Quantitative recovery following liquid-liquid extraction with diethyl ether from 500 microl of human plasma was achieved. Subsequently, the assay was performed with a linear gradient starting at 67 mM potassium dihydrogenphosphate-acetonitrile (65:35 to 40:60, v/v) as a mobile phase, a Phenomenex C18 column and UV detection at 240 and 258 nm, respectively. Linear standard curves were obtained for concentrations ranging from 75 to 20,000 ng/ml for indinavir, from 10 to 6000 ng/ml for saquinavir, and from 45 to 30,000 ng/ml for ritonavir. The calculated intra- and inter-day coefficients of variation were below 6%.
authors.affiliation: Department of Internal Medicine, University of Würzburg, Germany.
authors.forename: P
authors.initials: P
authors.lastname: Langmann
authors.forename: H
authors.initials: H
authors.lastname: Klinker
authors.forename: D
authors.initials: D
authors.lastname: Schirmer
authors.forename: M
authors.initials: M
authors.lastname: Zilly
authors.forename: A
authors.initials: A
authors.lastname: Bienert
authors.forename: E
authors.initials: E
authors.lastname: Richter
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D004355:Drug Stability; D004359:Drug Therapy, Combination; D015658:HIV Infections / Q000097:blood / Q000188:drug therapy*; D017320:HIV Protease Inhibitors / Q000097:blood*; D006801:Humans; D019469:Indinavir / Q000097:blood*; D007700:Kinetics; D019438:Ritonavir / Q000097:blood*; D019258:Saquinavir / Q000097:blood*; D012680:Sensitivity and Specificity
chemical_list: D017320:HIV Protease Inhibitors; D019469:Indinavir; D019258:Saquinavir; D019438:Ritonavir