UPLC/MS/MS analysis of the oil phase. Comparison of the mass spectrum resulting from analysis of the oil phase of reactions TE (upper plot) and PLA1 + TE (bottom plot). Samples were run with a RP column. For both chromatograms, ion 184 m/z in positive MS/MS mode were extracted. MS/MS, tandem mass spectrometry; PLA1, phospholipase A1; RP, reverse phase; TE, transesterification; UPLC, ultra-performance liquid chromatography.