Instantaneous characterization of vegetable oils via TAG and FFA profiles by easy ambient sonic-spray ionization mass spectrometry

摘要

A fast and reliable method is presented for the analysis of vegetable oils. Easy ambient sonic-spraynionization mass spectrometry (EASI-MS) is shown to efficiently desorb and ionize the main oilnconstituents from an inert surface under ambient conditions and to provide comprehensiventriacylglyceride (TAG) and free fatty acid (FFA) profiles detected mainly as either [TAG + Na]+ orn[FFA u0002 H]u0002 ions. EASI(u0003)-MS analysis is simple, easily implemented, requires just a tiny droplet of thenoil and is performed without any pre-separation or chemical manipulation. It also causes nonfragmentation of TAG ions hence diacylglyceride (DAG) and monoacylglyceride (MAG) profiles andncontents can also be measured. The EASI(u0003)-MS profiles of TAG and FFA permit authentication andnquality control and can be used, for instance, to access levels of adulteration, acidity, oxidation ornhydrolysis of vegetable oils in general.