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Chromatograms of blank saliva samples deproteinized with: (a) 1% formic acid in methanol; (b) 1% formic acid in acetonitrile. The separation was carried out 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.
