Figure 6

PIS chromatograms of Glc-PE (A) and Lac-PE (C) in MPLC, analysed in the presence of sodium. Figure inserts show Q1 mass spectra of each peak. Calibration curves of 34:1, 36:1 and 36:2 Glc-PE (B) and 34:1, 36:1 and 36:2 Lac-PE (D). Different amounts of Glc-PE and Lac-PE (1–20 pmol) were analysed in the PIS mode (PIS of m/z 326.1 or 488.1). Detailed analytical procedures are described in the Methods section.