Fig. 3From: Random and independent sampling of endogenous tryptic peptides from normal human EDTA plasma by liquid chromatography micro electrospray ionization and tandem mass spectrometryThe release of ethanol-soluble free amines from human EDTA plasma over time at room temperature. Dried plasma (225 µL) was extracted with 250 µL of absolute ethanol prior to reaction with Cd-ninhydrin alongside glycine standardsBack to article page