Flowchart of quantitative mass spectrometric analysis of lipid molecular species. Abbreviations: MTBE, Methyl tert-butyl ether; HPLC, High-Pressure Liquid Chromatography; UHPLC, Ultra-High-Pressure Liquid Chromatography; UPLC, Ultra-Pressure Liquid Chromatography; HILIC, Hydrophilic Interaction Chromatography; Q-TOF, quadrupole-Time of Flight; MSALL, All ion fragmentation; SWATH, Sequential Window Acquisition of all Theoretical fragment-ion spectra; ANOVA, Analysis of Variance; PCA, Principal Component Analysis; LDA, Linear Discriminate Analysis; PLS-DA, Partial Least-Square Discriminate Analysis.