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Oxidative stability of structured lipids produced from borage and evening primrose oils with docosahexaenoic acid



Oxidative stability of structured lipids produced from borage and evening primrose oils with docosahexaenoic acid



Journal of the American Oil Chemists' Society 79(10): 1003-1013



This study utilized gamma-linolenic acid (18:3n-6; GLA)-rich borage oil (BO) and evening primrose oil (EPO) for the synthesis of structured lipids (SL) and compared the oxidative stability of the products with those of unmodified BO and EPO as controls. Immobilized Novozym 435 lipase from Candida antarctica was used as the biocatalyst for SL production. BO or EPO was enzymatically modified with docosahexaenoic acid (22:6n-3; DHA), as the acyl donor, to produce SL. The SL were characterized and their oxidative stabilities evaluated. Among the oils examined, SL gave rise to higher quantities (Pltoreq0.05) of conjugated dienes, TBARS, and headspace volatiles as compared to their unmodified counterparts. Results indicated that modified oils were less stable than their unmodified counterparts. The double bond index (DBI) and methylene bridge index (MBI) of oils decreased (P<0.05) during oxidation in the more unsaturated oils. An attempt was made to correlate various parameters of oxidation with DBI and MBI of oils; correlation coefficients (-r) were within the range of 0.574-0.973. This suggests that indicators such as DBI and MBI can reflect oxidative stability of oils.

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Accession: 035448070

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