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Omega-6 fatty acids are fatty acids where the term "omega-6" signifies that the first double bond in the carbon backbone of the fatty acid, occurs in the omega minus 6 position; that is, the sixth carbon from the end of the fatty acid. See essential fatty acids for more detail on the naming system.
The biological effects of the ¦Ø-6 fatty acids are largely mediated by their interactions with the ¦Ø-3 fatty acids, see Essential fatty acid interactions for detail.
Linoleic acid (18:2), the shortest chain omega-6 fatty acid is an essential fatty acid. Arachidonic acid (20:4) is a physiologically significant n-6 fatty acid and is the precursor for prostaglandins and other physiologically active molecules.
Some medical research has suggested that excessive levels of omega-6 acids, relative to Omega-3 fatty acids, may increase the probability of a number of diseases and depression. Modern Western diets typically have ratios of omega-6 to omega-3 in excess of 10 to 1, some as high as 30 to 1. The optimal ratio is thought to be 4 to 1 or lower. [1]
Dietary sources of omega-6 fatty acids include:
[edit] List of omega-6 fatty acids
| Common name |
Lipid name |
Chemical name |
| Linoleic acid |
18:2 (n-6) |
9,12-octadecadienoic acid (亚油酸) |
| Gamma-linolenic acid |
18:3 (n-6) |
6,9,12-octadecatrienoic acid (γ-次亚麻油酸) |
| Eicosadienoic acid |
20:2 (n-6) |
11,14-eicosadienoic acid (二十碳二烯酸) |
| Dihomo-gamma-linolenic acid |
20:3 (n-6) |
8,11,14-eicosatrienoic acid (8,11,14-花生三烯酸) |
| Arachidonic acid |
20:4 (n-6) |
5,8,11,14-eicosatetraenoic acid (花生四烯酸) |
| Docosadienoic acid |
22:2 (n-6) |
13,16-docosadienoic acid (二十二-二烯酸) |
| Adrenic acid |
22:4 (n-6) |
7,10,13,16-docosatetraenoic acid |
| Docosapentaenoic acid |
22:5 (n-6) |
4,7,10,13,16-docosapentaenoic acid (二十二碳五烯酸) |
| Calendic acid |
18:3 (n-6) |
8E,10E,12Z-octadecatrienoic acid (金盏酸；十八（碳）三烯-8,10,12-酸) |
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