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Title: Quality of Crude Oil Extracted from Aging Walleye Pollock (Theragra chalcogramma) Byproducts

Author
item Wu, Ted
item Bechtel, Peter

Submitted to: Journal of the American Oil Chemists' Society
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 5/28/2009
Publication Date: 6/25/2009
Citation: Wu, T.H., Bechtel, P.J. 2009. Quality of Crude Oil Extracted from Aging Walleye Pollock (Theragra chalcogramma) Byproducts. Journal of the American Oil Chemists' Society. Available: http://www.springerlink.com/content/?k=wu+pollock+oil+crude.

Interpretive Summary: Quality of crude oil extracted from pollock byproducts aged at 6 and 15 'C for up to 4 and 10 days was examined. Longer storage of byproducts resulted in higher free fatty acid (FFA) and an increase in retinol levels in the extracted crude oils. Primary and secondary oxidative assays consisting of peroxide value and thiobarbituric acid-reactive substances initially increased with storage time on day 1 followed by an decrease with storage time. Higher storage temperature resulted in greater FFA and retinol levels, but lower oxidative products in the crude oils. The tocopherol levels decreased with storage time of the byproducts with no differences between the storage temperatures. No major losses in eicosapentaenoic acid (EPA), docosahexaenoic acid (DHA) and polyunsaturated fatty acids (PUFAs) were observed in the extracted oils with the respective storage time or temperature treatments.

Technical Abstract: Quality of crude oil extracted from pollock byproducts aged at 6 and 15 'C for up to 4 and 10 days was examined. Longer storage of byproducts resulted in higher free fatty acid (FFA) and an increase in retinol levels in the extracted crude oils. Primary and secondary oxidative assays consisting of peroxide value and thiobarbituric acid-reactive substances initially increased with storage time on day 1 followed by an decrease with storage time. Higher storage temperature resulted in greater FFA and retinol levels, but lower oxidative products in the crude oils. The tocopherol levels decreased with storage time of the byproducts with no differences between the storage temperatures. No major losses in eicosapentaenoic acid (EPA), docosahexaenoic acid (DHA) and polyunsaturated fatty acids (PUFAs) were observed in the extracted oils with the respective storage time or temperature treatments.