Fig. 3From: A simple and rapid extraction of lipids in plasma using spin column with superabsorbent polymer beads for mass spectrometryComparison of lipid recovery from lipid standard mixture by Matyash (black) and mSAP (gray) extraction methods using UPLC-MS in both positive-ion and negative-ion modes. The lipid standards were spiked before and after extraction of lipids from human plasma at the two different concentrations of a 5Â pmol and b 1Â pmolBack to article page