Oxidative stability during storage of structured lipids produced from fish oil and caprylic acid

Nina Skall Nielsen, Xuebing Xu, Maike Timm Heinrich, Charlotte Jacobsen

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Structured lipids produced by enzymatic or chemical methods for different applications have been receiving considerable attention. The oxidative stability of a randomized structured lipid (RFO), produced by chemical interesterification from fish oil (FO) and tricaprylin, and a specific structured lipid (SFO), produced by enzymatic interesterification from the same oil and caprylic acid, was compared with the stability of FO. Oils were stored at 2degreesC for 11 wk followed by storage at 20degreesC for 6 wk. In addition, the antioxidative effect of adding the metal chelators EDTA or citric acid to SFO was investigated. FO contained the largest amount of PUFA and RFO the lowest. However, SFO had a higher PV initially and during storage at 2degreesC, whereas the PV of FO was highest during storage at 20degreesC. The level of volatile oxidation products was highest in SFO during the entire storage period, and off-flavors were more pronounced in SFO. The lower oxidative stability of SFO was probably related to the initially lower quality (regarding oxidation products), which is apparently a result of the long production procedure required. Addition of metal chelators did not reduce the oxidation of the SFO
Original languageEnglish
JournalJournal of the american oil chemists society
Issue number4
Pages (from-to)375-384
Publication statusPublished - 2004

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