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Dartmouth, Canada

Ritter J.C.S.,Ascenta Health | Budge S.M.,Dalhousie University | Jovica F.,Ascenta Health
Journal of the Science of Food and Agriculture | Year: 2013

BACKGROUND: Fish oil supplements have grown in popularity in recent years owing to their multiple health benefits, leading to rapid growth in the number of fish oil supplements available for consumers. When choosing a product, it is important that label claims for eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) are met, especially when a specific dosage is required. In this study the amounts of EPA and DHA in 16 of the top-selling liquid fish oil products from the American marketplace were analysed and compared with their label claims. Peroxide value, a measure of oxidation, was also determined, along with lipid class. RESULTS: This study found that over half of the supplements did not meet their label claims for EPA and DHA, and a quarter exceeded recommended limits for peroxide value. CONCLUSION: These results suggest that more stringent regulation is required for fish oil products. © 2012 Society of Chemical Industry.

Sullivan Ritter J.C.,Ascenta Health | Budge S.M.,Dalhousie University | Jovica F.,Ascenta Health | Reid A.-J.M.,Ascenta Health | Reid A.-J.M.,Dalhousie University
JAOCS, Journal of the American Oil Chemists' Society | Year: 2015

Fish oil is available primarily as triacylglycerols (TAG) or ethyl esters (EE). Anecdotal evidence suggests that TAG have superior bioavailability and oxidative stability compared to EE. In this work, peroxide value (PV) and p-anisidine value (AV) were used to monitor oxidation in commercially available TAG and EE fish oils incubated at temperatures from 5 to 60°C. Pseudo first-order kinetics were assumed and rate constants were calculated for each temperature. At all temperatures, the rates of oxidation were higher for EE oils than TAG oils. For PV and AV measured in both oils, non-linear Arrhenius models were plotted, generating activation energies that ranged from 7 to 103 and 2 to 159 kJ/mol for PV and AV, respectively. Although TAG were more resistant to oxidation than EE, they had lower activation energies (Ea) at ≤15°C for reactions measured with PV and AV. The Ea for EE was negative at temperatures ≥45°C, indicating that reaction rate was influenced by factors in addition to temperature. © AOCS 2015.

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