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Cetoleic Acid - Monounsaturated Fatty Acid from Fish Oil
Cetoleic acid is a monounsaturated fatty acid naturally found in fish oils, increasingly studied for its potential role in nutrition and cardiovascular health.
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Cetoleic acid is a monounsaturated fatty acid naturally found in fish oils, increasingly studied for its potential role in nutrition and cardiovascular health.
What is Cetoleic Acid?
Cetoleic acid (systematic name: (11Z)-docos-11-enoic acid) is a long-chain monounsaturated fatty acid with the molecular formula C22:1(n-11). It belongs to the omega-11 family of fatty acids and is found naturally in the oils of certain marine fish and marine mammals. It is structurally distinct from other well-known C22:1 fatty acids such as erucic acid (n-9) and nervonic acid (n-9 or n-7).
Natural Sources
Cetoleic acid is a characteristic fatty acid of several marine species. The richest dietary sources include:
- Herring oil
- Capelin and lodde oil
- Anchovy and other pelagic fish oils
- Marine mammal oils (e.g., seal and whale oil)
It is largely absent from plant-based oils and terrestrial animal fats, making it a relatively unique marker of marine-origin lipids in dietary research.
Chemical Properties
Cetoleic acid is a 22-carbon fatty acid with a single double bond at the delta-11 position. This structural feature sets it apart from erucic acid (delta-13) and gives it distinct biochemical behaviour in human metabolism. It is typically present in the cis configuration, which is standard for naturally occurring unsaturated fatty acids.
Biological Functions and Metabolism
In the human body, cetoleic acid is metabolised primarily via beta-oxidation. It can also be incorporated into membrane phospholipids, potentially influencing cell membrane fluidity and function. Emerging research suggests possible effects including:
- Favourable influence on blood lipid profiles, particularly HDL cholesterol levels
- Potential anti-inflammatory properties similar to other monounsaturated fatty acids
- A possible protective role in cardiovascular health in populations with high fish consumption
It is important to note that research into cetoleic acid is still at an early stage. Many of the suggested health effects have not yet been conclusively confirmed by large-scale clinical trials.
Cetoleic Acid and Diet
For most people in Western countries, dietary intake of cetoleic acid is low due to limited consumption of fatty marine fish and fish oils. Populations with traditionally high fish consumption, such as those in Scandinavia or coastal regions, tend to have significantly higher intakes. Currently, no official daily intake recommendations for cetoleic acid have been established by organisations such as the WHO, EFSA, or national health bodies.
Safety and Tolerability
Cetoleic acid is considered safe at levels typically consumed through fish and fish products. Unlike the structurally related erucic acid, which has shown cardiotoxic effects in animal studies at high doses and is regulated in certain food products, no comparable safety concerns have been identified for cetoleic acid. However, very high supplemental doses should be approached with caution until more research is available.
References
- Bjørndal, B. et al. (2022): Cetoleic acid increases the fat content of Atlantic salmon without compromising human health. iScience, Elsevier. DOI: 10.1016/j.isci.2022.104759
- Gunstone, F. D., Harwood, J. L., Dijkstra, A. J. (Eds., 2007): The Lipid Handbook. 3rd edition. CRC Press.
- Breivik, H. (Ed., 2007): Long-Chain Omega-3 Specialty Oils. The Oily Press. Bridgwater, UK.
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