Identification of Polyunsaturated Triacylglycerols and C=C Location Isomers in Sacha Inchi Oil by Photochemical Reaction Mass Spectrometry Combined with Nuclear Magnetic Resonance Spectroscopy

In this study, we developed a methodology combined Paternò-Büchi reaction nanoelectrospray ionization mass spectrometry (PB-nanoESI-MS) and nuclear magnetic resonance (NMR) to identify C=C locations and isomers of PUTAGs in sacha inchi oil. Benzophenone was used as the PB reagent, and the optimized solvent composition (methanol:chloroform=9:1) allowed for PUTAGs and their PB products to be detected with higher intensities. In addition, we made efforts to interpret the MS2 spectra for identification lipid species. A series of C57-PUTAGs and C59-PUTAGs were detected and identified via high-resolution PB-nanoESI-MS, and the predominant PUTAGs were TAG 18:1(Δ9)_18:3(Δ9,12,15)_18:3(Δ9,12,15) and TAG 18:2(Δ9,12)_18:2(Δ9,12)_18:3 (Δ9,12,15), which demonstrated that the PB-nanoESI-MS approach in this study provides help in promoting the development of structural determination of triacylglycerols in food chemistry.
Source: Food Chemistry - Category: Food Science Source Type: research