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The fatty acid specificity of five lipases towards eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) was evaluated in the hydrolysis of fish oil, squid oil and a model system. The model system contained methyl esters of EPA, DHA and palmitic acid. All the investigated lipases discriminated against both EPA and DHA more in the model system than in the natural oils. Thus both EPA and DHA were...
The oxidation of free DHA has been investigated with respect to monohydroperoxides and polyhydroperoxides, which were analyzed with a novel HPLC method. The temperature and physical system, i.e., bulk and liposome, were varied. We have also studied the effects of antioxidants such as α-tocopherol, ascorbic acid, and juice from sea buckthorn on DHA. The HPLC method, which was performed isocratically,...
The oxidation of free DHA, DHA mixed with PC, and DHA incorporated into PC, PE, or TG was evaluated to determine which lipid provided DHA with the best protection against oxidation. DHA was either situated at the sn-1 position, sn-2 position, or both positions of the phospholipid, whereas the TG contained DHA at all positions. All lipids were incubated as bulk lipids, in chloroform, or as an emulsion...
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