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| Section2 = }} Eicosapentaenoic acid (EPA or also icosapentaenoic acid) is an omega-3 fatty acid. In physiological literature, it is given the name 20:5(n-3). It also has the trivial name timnodonic acid. In chemical structure, EPA is a carboxylic acid with a 20-carbon chain and five ''cis'' double bonds; the first double bond is located at the third carbon from the omega end. EPA is a polyunsaturated fatty acid (PUFA) that acts as a precursor for prostaglandin-3 (which inhibits platelet aggregation), thromboxane-3, and leukotriene-5 eicosanoids. Studies of fish oil supplements, which contain EPA, have failed to support claims of preventing heart attacks or strokes. ==Sources== It is obtained in the human diet by eating oily fish or fish oil, e.g. cod liver, herring, mackerel, salmon, menhaden and sardine, and various types of edible seaweed and phytoplankton. It is also found in human breast milk. However, fish do not naturally produce EPA, but obtain it from the algae they consume.〔(【引用サイトリンク】title=Plant based sources of vegan & vegetarian Docosahexaenoic acid - DHA and Eicosapentaenoic acid EPA & Essential Fats )〕 It is available to humans from some non-animal sources (e.g. commercially, from microalgae, which are being developed as a commercial source). EPA is not usually found in higher plants, but it has been reported in trace amounts in purslane. In 2013, it was reported that a genetically modified form of the plant Camelina produced significant amounts of EPA.〔Coghlan, Andy (4 January 2014) "Designed plant oozes vital fish oils"' New Scientist, volume 221, issue 2950, page 12, also available on the Internet at ()〕 The human body converts alpha-linolenic acid (ALA) to EPA. ALA is itself an essential fatty acid, an appropriate supply of which must be ensured. The efficiency of the conversion of ALA to EPA, however, is much lower than the absorption of EPA from food containing it. Because EPA is also a precursor to docosahexaenoic acid (DHA), ensuring a sufficient level of EPA on a diet containing neither EPA nor DHA is harder both because of the extra metabolic work required to synthesize EPA and because of the use of EPA to metabolize into DHA. Medical conditions like diabetes or certain allergies may significantly limit the human body's capacity for metabolization of EPA from ALA. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Eicosapentaenoic acid」の詳細全文を読む スポンサード リンク
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