83A-7 |
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A. C. M. OLIVEIRA, Fishery Industrial Technology Center, Univ. of Alaska, Fairbanks, School of Fisheries & Ocean Sciences, 118 Trident Way, Kodiak, AK 99615-7401 and P. J. Bechtel, Subarctic Agricultural Research Unit, USDA-ARS-Pacific West Area, Univ. of Alaska, Fairbanks, 245 O'Neill Bldg., Fairbanks, AK 99775-7220. The pollock fishery in Alaska has the highest yearly catches and generates over 700,000 MT of fish processing byproducts annually. These byproducts come from human food processing lines and can be maintained as separate components. The objective of this study was to chemically evaluate the lipids from pollock male and female livers. Six pollock male livers and six female livers were sampled on the same day at a processing plant in Kodiak (Alaska) during spring 2003. Livers were immediately frozen at -70oC. Proximate analysis and lipid extractions were completed within four weeks of sampling. An Iatroscan MK-6s was used to determine percent triacylglycerides, free fatty acids (FFA), diacylglycerides, monoacylglycerides, sterols, phosphatydyl-choline and phosphatydyl-ethanolamine in the oils. Fatty acid profiles were determined by GC/FID analysis. Data was statistically analyzed. Pollock livers, regardless of gender, had lipid contents over 50% of which about 75% were in the form of tryacylglycerides. Proximate composition was not significantly different between genders. Free fatty acids and phosphatydyl-choline levels were both low at about 4% each, for either male or female livers. Diacyl- and monoacylglycerides averages for all livers were about 8% and 6%, respectively. No phosphatydyl-ethanolamine was detected in the samples. Most fatty acids were not significantly different. However, female livers had significantly higher contents of palmitic and cis-oleic acids, while male livers had higher cetoleic acid. The abundance of saturated, monounsaturated, polyunsaturated fatty acids in all extracted oils averaged about 20%, 55%, and 24%, respectively. In all pollock livers omega-3 and omega-6 fatty acids levels were about 23% and 1.5 Only small gender differences were seen in Pollock liver lipids. The extracted oil for Pollock liver can be a valuable source of omega-3 fatty acids.
Session 83A, Aquatic Food Products: Byproducts, mince and surimi
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