title: Instantaneous characterization of vegetable oils via TAG and FFA profiles  by easy ambient sonic-spray ionization mass spectrometry.
abstract: A fast and reliable method is presented for the analysis of vegetable oils. Easy ambient sonic-spray ionization mass spectrometry (EASI-MS) is shown to efficiently desorb and ionize the main oil constituents from an inert surface under ambient conditions and to provide comprehensive triacylglyceride (TAG) and free fatty acid (FFA) profiles detected mainly as either [TAG + Na](+) or [FFA-H](-) ions. EASI(+/-)-MS analysis is simple, easily implemented, requires just a tiny droplet of the oil and is performed without any pre-separation or chemical manipulation. It also causes no fragmentation of TAG ions hence diacylglyceride (DAG) and monoacylglyceride (MAG) profiles and contents can also be measured. The EASI(+/-)-MS profiles of TAG and FFA permit authentication and quality control and can be used, for instance, to access levels of adulteration, acidity, oxidation or hydrolysis of vegetable oils in general.
authors.affiliation: ThoMSon Mass Spectrometry Laboratory, Institute of Chemistry, University of Campinas, UNICAMP, 13083-970 Campinas, SP, Brazil.
authors.forename: Rosineide C
authors.initials: RC
authors.lastname: Simas
authors.forename: Rodrigo R
authors.initials: RR
authors.lastname: Catharino
authors.forename: Ildenize B S
authors.initials: IB
authors.lastname: Cunha
authors.forename: Elaine C
authors.initials: EC
authors.lastname: Cabral
authors.forename: Daniel
authors.initials: D
authors.lastname: Barrera-Arellano
authors.forename: Marcos N
authors.initials: MN
authors.lastname: Eberlin
authors.forename: Rosana M
authors.initials: RM
authors.lastname: Alberici
mesh_terms: D005227:Fatty Acids / Q000737:chemistry*; D010938:Plant Oils / Q000737:chemistry*; D021241:Spectrometry, Mass, Electrospray Ionization / Q000295:instrumentation* / Q000379:methods; D014280:Triglycerides / Q000737:chemistry*; D014465:Ultrasonics
chemical_list: D005227:Fatty Acids; D010938:Plant Oils; D014280:Triglycerides