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Free fatty acids in commercial krill oils: concentrations, compositions, and implications for oxidative stability
journal contribution
posted on 2020-08-01, 00:00 authored by I D Fuller, A H Cumming, A Card, E J Burgess, Colin BarrowColin Barrow, N B Perry, D P KilleenThe concentrations and pro-oxidative effects of free fatty acids in commercial krill oil are not well defined. We now report that krill oil free fatty acids account for 2–13% of total lipids in commercial krill oil (n = 8) that these compounds are enriched in eicosapentaenoic acid (+7.1%) and docosahexaenoic acid (+6.3%) relative to whole oils; and that this composition make them highly pro-oxidizing in marine triacylglycerol oils, but not in krill oil, which derives oxidative stability from both its phospholipids, and neutral lipids (the latter because of astaxanthin). Specific fatty acid esterification patterns showed that krill oil free fatty acids predominantly (88–93%) originated from phospholipids, mainly from the sn-2 position, which was eight-fold more hydrolyzed than the sn-1 position. Lipolysis was not ongoing in stored oils. Adding small amounts of krill oil (1–5%) to marine triacylglycerol oils significantly increased their oxidative stability and also their resistance to free fatty acid-mediated pro-oxidative effects.
History
Journal
JAOCS, Journal of the American Oil Chemists' SocietyVolume
97Issue
8Pagination
889 - 900Publisher
WileyLocation
Chichester, Eng.Publisher DOI
ISSN
0003-021XLanguage
engPublication classification
C Journal article; C1 Refereed article in a scholarly journalUsage metrics
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No categories selectedKeywords
Science & TechnologyPhysical SciencesLife Sciences & BiomedicineChemistry, AppliedFood Science & TechnologyChemistryKrill oilOxidationFree fatty acidsPhospholipidsOmega-3Docosahexaenoic acidEicosapentaenoic acidPhytanic acidNONENZYMATIC BROWNING REACTIONSANTARCTIC KRILLLIPID OXIDATIONEXTRACTIONMECHANISMSP-31
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