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Quantitative Method for the Determination of Posaconazole in Mouse Tissues using Liquid Chromatography-Mass Spectrometry

Ibrahim El- Serafi, Tommy Pettersson, Ola Blennow, Jonas Mattsson, Erik Eliasson, Anton Pohanka and Moustapha Hassan

Fast and selective liquid chromatography-mass spectrometry (LC-MS) method was developed for the quantification of posaconazole in different mouse organs including liver, heart, brain, kidney and lung. Organs were homogenized and diluted in isotonic NaCl solution. Protein was precipitated using acetonitrile containing internal standard and analyzed. The analysis was carried out using gradient condition with mobile phases consisting of aqueous formic acid and pure acetonitrile. Analysis was run at a flow-rate of 0.51 mL/min. The method was selective with a limit of quantification of 0.5 μg/mL in homogenate at a sample volume of 100 μL. The standard curve was linear over a concentration range of 0.5-10 μg/mL for all organs. The inter-day and intra-day coefficient of variation values were all less than 15%. Hence, the method is suitable for use in pharmacokinetic and bioavailability studies of posaconazole in tissues.