Document Detail


Modeling the primary oxidation in commercial fish oil preparations.
MedLine Citation:
PMID:  21104333     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
The quality of commercial fish oil products can be difficult to maintain because of the rapid lipid oxidation attributable to the high number of polyunsaturated fatty acids (PUFA), specifically eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). While it is known that oxidation in fish oil is generally the result of a direct interaction with oxygen and fatty acid radicals, there are very few studies that investigate the oxidation kinetics of fish oil supplements. This study uses hydroperoxides, a primary oxidation product, to model the oxidation kinetics of two commercially available fish oil supplements with different EPA and DHA contents. Pseudo first order kinetics were assumed, and rate constants were determined for temperatures between 4 and 60 °C. This data was fit to the Arrhenius model, and activation energies (E (a)) were determined for each sample. Both E (a) agreed with values found in the literature, with the lower PUFA sample having a lower E (a). The oil with a lower PUFA content fit the first-order kinetics model at temperatures ≥20 °C and ≤40 °C, while the higher PUFA oil demonstrated first-order kinetics at temperatures ≥4 °C and ≤40 °C. When the temperature was raised to 60 °C, the model no longer applied. This indicates that accelerated testing of fish oil should be conducted at temperatures ≤40 °C.
Authors:
Jenna C Sullivan; Suzanne M Budge; Marc St-Onge
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Publication Detail:
Type:  Journal Article     Date:  2010-11-23
Journal Detail:
Title:  Lipids     Volume:  46     ISSN:  1558-9307     ISO Abbreviation:  Lipids     Publication Date:  2011 Jan 
Date Detail:
Created Date:  2011-01-21     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0060450     Medline TA:  Lipids     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  87-93     Citation Subset:  IM    
Affiliation:
Department of Process Engineering and Applied Science, Dalhousie University, Halifax, NS, B3J 2X4, Canada, jcsulliv@dal.ca.
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