Abbreviations DGTS DHB ESI-MS FAs FFAs GC-MS HILIC MALDI-TOF-MS MRM MS/MS Nod OD PCA RP-LC TIC TMS diacylglyceryl-N,N,N-trimethylhomoserine 2,5-dihydroxybenzoic acid electrospray ionization mass spectrometry fatty acids free fatty acids gas chromatography–mass spectrometry hydrophilic interaction ...