title: Complex role of monoacylglycerols in the oxidation of vegetable oils: different behaviors of soybean monoacylglycerols in different oils.
abstract: The relationship between fatty acid composition of oils and their oxidative stability in the presence of monoacylglycerols was investigated. Purified vegetable oils were added at increasing amounts (0.5, 1, 2, and 3%) of monoacylglycerols obtained from purified soybean oil and submitted to an oven test (60 °C for 18 days). The obtained results showed a generally antioxidant effect of monoacylglycerols, with remarkable differences among oils. The antioxidant effect was significantly higher in less unsaturated oils, such as palm and olive oils. Among the more unsaturated vegetable oils, peanut and sunflower oils showed an almost linear slowdown of oxidation, slightly less pronounced in sunflower oil, which was the most susceptible to oxidation due to its high content of linoleic acid. A peculiar trend was highlighted for soybean oil, where the antioxidant effect of high amounts of monoacylglycerols was opposed to a pro-oxidant effect observed up to 1%.
authors.affiliation: Department of Soil, Plant and Food Sciences, Food Science and Technology Unit, University of Bari Aldo Moro , Via Amendola 165/A, I-70126 Bari, Italy.
authors.forename: Vito Michele
authors.initials: VM
authors.lastname: Paradiso
authors.forename: Francesco
authors.initials: F
authors.lastname: Caponio
authors.forename: Giuseppina
authors.initials: G
authors.lastname: Bruno
authors.forename: Antonella
authors.initials: A
authors.lastname: Pasqualone
authors.forename: Carmine
authors.initials: C
authors.lastname: Summo
authors.forename: Tommaso
authors.initials: T
authors.lastname: Gomes
mesh_terms: D000975:Antioxidants / Q000737:chemistry*; D005503:Food Additives / Q000737:chemistry*; D006358:Hot Temperature; D050178:Monoglycerides / Q000737:chemistry*; D010084:Oxidation-Reduction; D010936:Plant Extracts / Q000737:chemistry*; D010938:Plant Oils / Q000737:chemistry*; D013024:Soybean Oil / Q000737:chemistry*
chemical_list: D000975:Antioxidants; D005503:Food Additives; D050178:Monoglycerides; D010936:Plant Extracts; D010938:Plant Oils; D013024:Soybean Oil
keywords: fatty acid composition; monoacylglycerols; oxidative stability; vegetable oils