High Performance Liquid Chromatographic Method
52 EU RO PE AN JOUR NAL OF MED I CAL RE SEARCH February 25, 2008 Eur J Med Res (2008) 13: 52-58 © I. Holzapfel Publishers 2008 HIGH PERFORMANCE LIQUID CHROMATOGRAPHIC METHOD FOR THE DETERMINATION OF HIV-1 PROTEASE INHIBITOR TIPRANAVIR IN PLASMA OF PATIENTS DURING HIGHLY ACTIVE ANTIRETROVIRAL THERAPY P. Langmann1, W. Heinz2, H. Klinker2, D. Schirmer2, C. Guhl2, M. Leyh2, R. Winzer2 1Schwerpunktpraxis Infektiologie, Karlstadt, 2University of Würzburg, Division of Infectiology and Hepatology, Department of Internal Medicine, Würzburg, Germany Abstract 2. EXPERIMENTAL A new high-performance liquid chromatographic method for the determination of tipranavir in human 2.1. CHEMICALS AND REAGENTS plasma is described. Quantitative recovery following liquid – liquid - ex- Tipranavir (PNU 140690), was kindly provided by traction with diethylether from 100 µl of human plas- Boehringer-Ingelheim/ Ridgefield USA. The internal ma was achieved. Subsequently, the assay was per- standard (A-86093) was kindly supplied by Abbott Inc. formed with 67 mM potassium dihydrogen phos- (Abbott Lab. North Chicago, USA). phate-acetonitrile as a mobile phase, a Phenomenex C Diethylether, acetonitrile, methanol, distilled water, 18 column and UV detection at 255 nm. Linear Stan- potassium dihydrogen phosphate, disodium hydrogen dard curves were obtained for concentrations ranging phosphate dihydrate and sodium hydroxide were prod- from 2.5 to 400 µg/ml. The calculated intra- and inter- ucts of Merck (Darmstadt, Germany). Blank, drug day coefficents of variation were below 7%. free plasma was obtained from Sigma-Aldrich Chemie (Deisenhofen, Germany). Keywords: HPLC, tipranavir, drug monitoring All chemicals were of analytical reagent grade and all solvents were of HPLC grade.
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