title: Study by ³¹P NMR spectroscopy of the triacylglycerol degradation processes in olive oil with different heat-transfer mechanisms.
abstract: The thermal degradation of olive oil using conventional and microwave heating under the same experimental conditions were compared. A powerful identification and quantification technique based on (31)P NMR has been developed to characterise the differences between the minor components including diacylglycerol and free fatty acids in the heated samples. The (31)P NMR spectra of the degraded olive oils, which contain OH groups derivatised with a phosphorus reagent, showed that conventional heating is more detrimental to the oil than microwave technique. Conventional heating leads to a significant increase in the diacylglycerol and free fatty acid contents as well as in the number of degradation compounds, which damage the olive oil quality. However, the main process that takes place on using microwave heating is isomerisation between diacylglycerols, a change that could give a potential longer shelf life to the olive oil.
authors.affiliation: Department of Organic Chemistry, Faculty of Chemical Sciences and Technologies (San Alberto Magno Building), University of Castilla-La Mancha, Av. Camilo José Cela, 10, 13071 Ciudad Real, Spain.
authors.forename: Covadonga
authors.initials: C
authors.lastname: Lucas-Torres
authors.affiliation: Department of Chemical Engineering, Faculty of Chemical Sciences and Technologies (Enrique Costa Novella Building), University of Castilla-La Mancha, Av. Camilo José Cela, 12, 13071 Ciudad Real, Spain.
authors.forename: Angel
authors.initials: A
authors.lastname: Pérez
authors.affiliation: Department of Physical Chemistry, Faculty of Chemical Sciences and Technologies (Marie Curie Building), University of Castilla-La Mancha, Av. Camilo José Cela s/n, 13071 Ciudad Real, Spain.
authors.forename: Beatriz
authors.initials: B
authors.lastname: Cabañas
authors.affiliation: Department of Organic Chemistry, Faculty of Chemical Sciences and Technologies (San Alberto Magno Building), University of Castilla-La Mancha, Av. Camilo José Cela, 10, 13071 Ciudad Real, Spain. Electronic address: Andres.Moreno@uclm.es.
authors.forename: Andrés
authors.initials: A
authors.lastname: Moreno
mesh_terms: D005230:Fatty Acids, Nonesterified; D006358:Hot Temperature; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D000069463:Olive Oil / Q000737:chemistry*; D014280:Triglycerides / Q000737:chemistry*
chemical_list: D005230:Fatty Acids, Nonesterified; D000069463:Olive Oil; D014280:Triglycerides
keywords: (31)P NMR; Conventional heating; Diacylglycerol isomerisation; Microwave dielectric heating; Olive oil; Triacylglycerol hydrolysis