title: Simultaneous quantitative determination of the HIV protease inhibitors indinavir, amprenavir, ritonavir, lopinavir, saquinavir, nelfinavir and the nelfinavir active metabolite M8 in plasma by liquid chromatography.
abstract: A simple HPLC method that quantitates all six currently available protease inhibitors and the nelfinavir active metabolite M8 in one assay is presented. A 500-microliter plasma sample was treated by liquid-liquid extraction with a mixture of heptane and ethyl acetate. After evaporation, the residue was redissolved in sodium dihydrogenphosphate and acetonitrile and washed twice with heptane. Chromatography was performed with an analytical C(18) column. Ultraviolet detection at 210 and 239 nm was used. The present method is associated with high accuracy and low imprecision in the concentration range of 25-5000 ng/ml of all six protease inhibitors and M8. This makes it suitable for monitoring purposes.
authors.affiliation: Institute of Public Health, Clinical Pharmacology, University of Southern Denmark, Winsloewparken 19, DK-5000 C, Odense, Denmark. ujustesen@health.sdu.dk
authors.forename: U S
authors.initials: US
authors.lastname: Justesen
authors.forename: C
authors.initials: C
authors.lastname: Pedersen
authors.forename: N A
authors.initials: NA
authors.lastname: Klitgaard
mesh_terms: D016022:Case-Control Studies; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D017320:HIV Protease Inhibitors / Q000097:blood*; D006801:Humans; D012680:Sensitivity and Specificity; D013056:Spectrophotometry, Ultraviolet
chemical_list: D017320:HIV Protease Inhibitors