OBJECTIVES: The aim of this study was to develop and validate a gas chromatographic method with flame ionization detection (GC-FID) for the measurement of ibuprofen, naproxen and ketoprofen for clinical toxicology purposes. DESIGN AND METHODS: 100μL of plasma was treated with methyl chloroformate and derivatized analytes were extracted with hexane. Optimal conditions of the derivatization procedure have been found using the experimental chemometric design (face-centered central composite design). The selectivity and efficiency of the procedure was confirmed by GC-MS. RESULTS: The assay was linear in the concentration range of 10-400μgmL(-1), with adequate accuracy and precision for GC-FID (98-106.7%, CV≤9.1%, respectively) and for GC-MS (99.3-105.5%, CV≤9.2%, respectively). CONCLUSION: The entire sample preparation procedure is completed within 5 min and the quantitative results are available within 35 min. The method was successfully applied to quantify the selected compounds in serum of patients from emergency units.

Institute of Forensic Medicine and Toxicology 1st Faculty of Medicine Charles University Prague and General University Hospital 121 08 Prague 2 Czech Republic

Institute of Forensic Medicine and Toxicology 1st Faculty of Medicine Charles University Prague and General University Hospital 121 08 Prague 2 Czech Republic; Department of Analytical Chemistry Faculty of Science Charles University Prague Albertov 6 128 43 Prague 2 Czech Republic

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