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Chromatograms of saliva sample spiked with 1000 ng/mL after deproteinization with 1% formic acid in acetonitrile. The compounds were separated using a Luna Omega 1.6 µm Polar C18 column and a mobile phase consisting of water with formic acid (solvent A) and acetonitrile (solvent B) at a flow of 1 mL/min. (a) without evaporation; (b) after evaporation and dissolving in mobile phase. 1—carbamzepine-10,11 epoxide; 2—carbamazepine; 3—IS (chlordiazepoxide).
