Elaidic acid

Elaidic acid is a chemical compound with the formula, specifically the fatty acid with structural formula, with the double bond in trans configuration. It is a colorless solid. Its salts and esters are called elaidates.
Elaidic acid is an unsaturated trans fatty acid, with code C18:1 trans-9. This compound has attracted attention because it is a major trans fat found in hydrogenated vegetable oils, and trans fats have been implicated in heart disease.
It is the trans isomer of oleic acid. The name of the elaidinization reaction comes from elaidic acid.

Etymology

The name elaidic comes from the Ancient Greek word ἔλαιον, meaning oil.

Elaidic acid occurs mostly in industrial hydrogenation of polyunsaturated fatty acids. It's also present in small amounts in goat and cow milk and in some meats.
Elaidic acid increases plasma cholesterylester [transfer protein] activity which lowers HDL cholesterol.