Omega-9 fatty acid

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Types of Fats in Food
Unsaturated fat Monounsaturated fat Polyunsaturated fat Trans fat Omega: 3, 6, 9 Saturated fat Interesterified fat
See Also
Fatty acid Essential fatty acid

Omega-9 fatty acids are a class of unsaturated fatty acids which have a C=C double bond in the ω-9 position. (See Nomenclature for terms and discussion of ω (omega) nomenclature.) Some ω-9's are common components of animal fat and vegetable oil.

Two commercially important ω-9 fatty acids are:

Oleic acid (18:1 ω-9) which is a main component of olive oil and other monounsaturated fats.
Erucic acid (22:1 ω-9) which is found in rapeseed, wallflower seed, and mustard seed. Rapeseed with high erucic acid content is grown for commercial use in paintings and coatings as a drying oil.

Unlike ω-3 and ω-6 fatty acids, ω-9 fatty acids are not classed as essential fatty acids (EFA). This is both because they can be created by the human body from unsaturated fat and are therefore not essential in the diet, and because the lack of an ω-6 double bond keeps them from participating in the reactions that form the eicosanoids.

Under severe conditions of EFA deprivation, mammals will elongate and desaturate oleic acid to make mead acid, (20:3 ω-9). (Lipomics) This also occurs to a lesser extent in vegetarians and semi-vegetarians. (Phinney, 1990)

[edit] List of omega-9 fatty acids

Common name	Lipid name	Chemical name
oleic acid	18:1 (n-9)	9-octadecenoic acid
eicosenoic acid	20:1 (n-9)	11-eicosenoic acid
mead acid	20:3 (n-9)	5,8,11-eicosatrienoic acid
erucic acid	22:1 (n-9)	13-docosenoic acid
nervonic acid	24:1 (n-9)	15-tetracosenoic acid