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Novel branched-chain fatty acids in certain fish oils
W M Ratnayake1, B Olsson, R G Ackman
1Technical University of Nova Scotia, Halifax, Canada B3J 2X4.
Lipids
|July 1, 1989
Summary
Methyl-branched fatty acids, usually minor components, were concentrated during omega-3 fatty acid enrichment. Novel branched fatty acids were identified in redfish oil, with distinct profiles across different fish oils.
Area of Science:
- Lipid chemistry
- Marine biochemistry
- Analytical chemistry
Background:
- Methyl-branched fatty acids are typically minor constituents (<0.1%) in fish oils.
- Urea complexation is a method for enriching omega-3 polyunsaturated fatty acids.
- Understanding the composition of fish oils is crucial for nutritional and industrial applications.
Purpose of the Study:
- To characterize methyl-branched fatty acids concentrated during omega-3 enrichment of fish oils.
- To identify novel branched-chain fatty acids in specific fish oil sources.
- To compare the branched fatty acid profiles across different fish species.
Main Methods:
- Urea complexation for fatty acid enrichment.
- Gas chromatography (GC) for fatty acid separation and quantification.
- Gas chromatography/mass spectrometry (GC/MS) for structural identification of fatty acids.
Main Results:
- Methyl-branched fatty acids concentrated with polyunsaturated fatty acids in the non-urea-complexing fraction.
- Identified known isoprenoid acids (pristanic, phytanic) and iso/anteiso structures.
- Discovered two novel phytol-derived fatty acids (2,2,6,10,14-pentamethylpentadecanoic, 2,3,7,11,15-pentamethylhexadecanoic) in redfish oil, absent in menhaden and salmon oils.
- Identified 7-methyl-7-hexadecenoic acid as a major branched acid in salmon oil.
- Detected a novel vicinal dimethyl-branched fatty acid (7,8-dimethyl-7-hexadecenoic) in all examined fish oils, prominent in salmon oil.
- Found three previously undescribed monomethyl-branched fatty acids (11-methyltetradecanoic, 11- and 13-methylhexadecanoic) in salmon, redfish, and menhaden oils.
Conclusions:
- The urea complexation process effectively concentrates methyl-branched fatty acids, including novel ones, alongside omega-3 polyunsaturated fatty acids.
- Fish species exhibit distinct profiles of methyl-branched fatty acids, indicating species-specific lipid metabolism.
- The identification of novel branched fatty acids expands the known diversity of fatty acids in marine lipids.