A new arrangement of the INCAT (inside needle capillary adsorption trap) device with Carbopack X and Carboxen 1000 as sorbent materials was applied for sampling, preconcentration and injection of C6C19n-alkanes and their monomethyl analogs in exhaled breath samples. For the analysis both GC-MS/MS and GC×GC-FID techniques were used. Identification of the analytes was based on standards, measured retention indices and selective SRM transitions of the individual isomers. The GC-MS/MS detection limits were in the range from 2.1 pg for n-tetradecane to 86 pg for 5-methyloctadecane. The GC×GC-FID detection limits ranged from 19 pg for n-dodecane to 110 pg for 3-methyloctane.

Department of Analytical Chemistry Faculty of Science Charles University Prague Albertov 6 128 43 Prague 2 Czech Republic

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

Institute of Chemistry Faculty of Natural Sciences Comenius University Mlynská dolina CH 2 842 15 Bratislava Slovakia

Institute of Chemistry Faculty of Natural Sciences Comenius University Mlynská dolina CH 2 842 15 Bratislava Slovakia; SynthCluster s r o Komenského 1439 900 01 Modra Slovakia

Univ Clinic of Anesthesia and Intensive Care Innsbruck Medical University Anichstrasse 35 A 6020 Innsbruck Austria; Breath Research Institute of the University of Innsbruck Rathausplatz 4 A 6850 Dornbirn Austria

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