Eicosadienoic acid
Eicosadienoic acid is a polyunsaturated omega-6 fatty acid with the chemical formula. It is classified as a 20-carbon fatty acid with two double bonds, specifically at the 11th and 14th positions. EDA is a minor fatty acid found in certain animal and plant sources and plays a role in lipid metabolism.
Properties
Like other polyunsaturated fatty acids, EDA is hydrophobic and insoluble in water but soluble in organic solvents. It is a precursor for longer-chain omega-6 fatty acids, such as dihomo-gamma-linolenic acid and arachidonic acid.Isomers
Several isomers are common, all with bonds in the cis-configuration. The omega-6 isomer with bonds in the positions 11 and 14, also known as di-homo-linoleic acid, can be detected in modest concentrations, generally not exceeding 2%, in the seed oils of hundreds of plants, particularly Cruciferae, Ranunculaceae, and Pinaceae, as well as in human breast milk.The omega-9 isomer with bonds in the positions 5 and 11, also known as keteleeronic acid, can be detected in modest concentrations, generally not exceeding 2%, in the seed oils of Pinaceae and Cupressaceae.
Rarer in the plant world are the isomers with bonds in the positions 6 and 9, or 7 and 11, known as di-homotaxoleic acid.