Structural characteristics of marine lipids and preparation of omega 3 concentrates
1997
Wanasundara, U.N. | Shahidi, F.
Marine oils, rich in omega 3 fatty acids, have been recognized as desirable dietary components. Intestinal absorption of these long chain fatty acids is somewhat dependent on their arrangement h-1 the triaclyglycerol (TAG) molecules. In this study, positional distribution of omega 3 fatty acids namely eicosapentaenoic acid (EPA), docosapentaenoic acid (DPA) and docosahexaenoic acid (DHA) in the TAG of seal blubber oil (SBO) and menhaden oil (MHO) was determined via reaction with Grignard reagent. EPA, DPA and DHA occurred mainly in the sn-1 and sn-3 positions of the TAG in SBO. The relative amounts in the sn-1 and sn-3 positions were: EPA, 8.36 and 11.2; DPA, 3.99 and 8.21; and DHA, 10.5 and 17.9%, respectively. In MHO, DPA and DHA occurred mainly in the sn-2 position of the TAG at 3.11 and 17.2%, respectively. However, EPA was equally distributed in the sn-2-and sn-3 positions and was present only in minute amounts in the sn-1 position. Enzyme assisted hydrolysis of SBO and MHO was carried out to increase the content of omega 3 fatty acids in the acyglycerol form. Among lipases tested, Candida cylindracea-lipase was most active and resulted in highest increase in the content of total omega 3 fatty acids, EPA and DHA, in the non-hydrolysed fraction of both SBO and MHO.
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