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Antioxidant activity of phenolic compounds in sunflower oil-in-water emulsions containing sodium caseinate and lactose

AuthorsVelasco, Joaquín ; Dobarganes, M. Carmen ; Márquez Ruiz, Gloria
KeywordsPhenolic compounds
Oxidized triacylglycerols
Oil-in-water emulsions
Issue Date2004
CitationEuropean Journal of Lipid Science and Technology 106: 325- 333 (2004)
AbstractThe aim of this work was to study the evolution of oxidation and the efficiency of phenolic antioxidants in sunflower oil-in-water emulsions containing sodium caseinate and lactose (Cas-Lac) or stabilized by Tween-20 (T-20). Two groups of phenolic antioxidants which are structurally similar were tested, i.e. (1) α-tocopherol and its water-soluble analogue, Trolox; and (2) gallic acid and its ester derivatives propyl gallate and dodecyl gallate. Emulsion samples were oxidized at 40°C and the progress of oxidation was followed through quantitation of oxidized triacylglycerol monomers, dimers and oligomers. Results showed that Cas-Lac emulsions were more stable to oxidation than T-20 emulsions. In both types of emulsions, the most protective antioxidants were the compounds of lower polarity, namely, α-tocopherol and dodecyl gallate. It was also found that substantial amounts of α-tocopherol coexisted with significant polymerization, which was indicative of the heterogeneity of oxidation, i.e. differences of oxidation rate in oil droplets.
Identifiersdoi: 10.1002/ejlt.200300857
issn: 1438-7697
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