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Vaccenic acid is a naturally occurring Trans fat and an omega-7 fatty acid. It is the predominant kind of trans-fatty acid found in human milk, in the fat of , and in such as milk, butter, and yogurt. Vaccenic acid was discovered in 1928 in and butter.
Mammals (including humans) convert it into rumenic acid, a conjugated linoleic acid. This reaction is mediated by delta-9 desaturase.
Cow milk had highest vaccenic acid content in the first few days of milking.
Its IUPAC name is (11 E)-11-octadecenoic acid, and its lipid shorthand name is 18:1 trans-11. The name was derived from the Latin vacca (cow). Its stereoisomer, cis-vaccenic acid, is found in sea buckthorn ( Hippophae rhamnoides) oil. Its IUPAC name is (11 Z)-11-octadecenoic acid, and its lipid shorthand name is 18:1 cis-11.
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