Elaidic acid

Elaidic acid is a chemical compound with the formula C
₁₈H
₃₄O
₂, specifically the fatty acid with structural formula HOOC−(CH₂)₇−CH=CH−(CH₂)₇−CH₃, with the double bond (between carbon atoms 9 and 10) in trans configuration. It is a colorless solid. Its salts and esters are called elaidates.

Elaidic acid

Names
IUPAC name (E)-octadec-9-enoic acid
Other names (E)-9-octadecenoic acid (9E)-octadecenoic acid trans-9-octadecenoic acid 18:1 trans-9 C18:1 trans-9
Identifiers
CAS Number	112-79-8 Y
3D model (JSmol)	Interactive image
ChEBI	CHEBI:27997 Y
ChEMBL	ChEMBL460657 Y
ChemSpider	553123 Y
DrugBank	DB04224 Y
ECHA InfoCard	100.003.642
KEGG	C01712 Y
PubChem CID	637517
UNII	4837010H8C Y
CompTox Dashboard (EPA)	DTXSID8058619
InChI InChI=1S/C18H34O2/c1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18(19)20/h9-10H,2-8,11-17H2,1H3,(H,19,20)/b10-9+ Y Key: ZQPPMHVWECSIRJ-MDZDMXLPSA-N Y InChI=1/C18H34O2/c1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18(19)20/h9-10H,2-8,11-17H2,1H3,(H,19,20)/b10-9+ Key: ZQPPMHVWECSIRJ-MDZDMXLPBT
SMILES O=C(O)CCCCCCC/C=C/CCCCCCCC
Properties
Chemical formula	C 18H 34O 2
Molar mass	282.46 g/mol
Appearance	colorless waxy solid
Density	0.8734 g/cm3
Melting point	45 °C (113 °F)
Magnetic susceptibility (χ)	−204.8·10−6 cm3/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y verify (what is YN ?) Infobox references

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.^[1]

It is the trans isomer of oleic acid. The name of the elaidinization reaction comes from elaidic acid.

Its name comes from the Ancient Greek word ἔλαιον (elaion), meaning oil.

Occurrence and bioactivity

Elaidic acid occurs mostly in industrial hydrogenation of polyunsaturated fatty acids.^[2] It's also present in small amounts in caprine and bovine milk (very roughly 0.1% of the fatty acids)^[3] and in some meats.^[4]

Elaidic acid increases plasma cholesterylester transfer protein (CETP) activity which lowers HDL cholesterol.^[5]

See also

• Oleic acid