Arachidic acid, also known as eicosanoic acid, is a saturated fatty acid with a 20-carbon chain. It is as a minor constituent of cupuaçu butter (7%), peanut oil (1.1%–1.7%), corn oil (3%), and cocoa butter (1%). Typical Fatty acid composition (%): Its name derives from the Latin arachis — peanut. It can be formed by the hydrogenation of arachidonic acid. Reduction of arachidic acid yields arachidyl alcohol. Arachidic acid is used for the production of detergents, photographic materials and lubricants.

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