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{{chembox| Watchedfields = changed| verifiedrevid = 443720273| ImageFile=Elaidic-acid-2D-skeletal-reverse.png| ImageSize=250| ImageFile1=Elaidic-acid-from-xtal-3D-balls.png| ImageSize1=250| ImageFile2=Elaidic-acid-from-xtal-3D-vdW.png| ImageSize2=250| IUPACName=(E)-octadec-9-enoic acid| SystematicName=| OtherNames=(E)-9-octadecenoic acid(9E)-octadecenoic acidtrans-9-octadecenoic acid18:1 trans-9C18:1 trans-9|Section1={{Chembox Identifiers

correct|chemspider}}| ChemSpiderID = 553123

correct|kegg}}| KEGG = C01712| 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+| InChIKey = ZQPPMHVWECSIRJ-MDZDMXLPBT

correct|EBI}}| ChEMBL = 460657

correct|chemspider}}| StdInChI = 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+

correct|chemspider}}| StdInChIKey = ZQPPMHVWECSIRJ-MDZDMXLPSA-N

correct|CAS}}| CASNo = 112-79-8| IUPHAR_ligand =

correct|FDA}}| UNII = 4837010H8C| PubChem = 637517

correct|drugbank}}| DrugBank = DB04224

correct|EBI}}| ChEBI = 27997| SMILES = O=C(O)CCCCCCC/C=C/CCCCCCCC}}|Section2={{Chembox Properties

C

H

O|2}}| MolarMass=282.46 g/mol| Appearance= colorless waxy solid| Density= 0.8734 g/cm3

45

F}}| BoilingPt=| Solubility=| MagSus = -204.8·10−6 cm3/mol }}|Section3={{Chembox Hazards| MainHazards=| FlashPt=| AutoignitionPt = }} }}Elaidic acid is a chemical compound with the formula {{chem|C|18|H|34|O|2}}, specifically the fatty acid with structural formula {{chem2|HOOCs(CH2)7sCHdCHs(CH2)7sCH3}}, with the double bond (between carbon atoms 9 and 10) in trans configuration. It is a colorless oily 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.JOURNAL, 10.1017/S0954422411000011, 21320382, Ruminant and industrial sources of trans-fat and cardiovascular and diabetic diseases, Nutrition Research Reviews, 24, 1, 111–7, 2011, Tardy, Anne-Laure, Morio, Béatrice, Chardigny, Jean-Michel, Malpuech-Brugère, Corinne, free, 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 (wikt:ἔλαιον|ἔλαιον) (elaion), meaning oil. Occurrence and bioactivity Elaidic acid occurs mostly in industrial hydrogenation of polyunsaturated fatty acids.JOURNAL, Wendeu-Foyet, Gaëlle, Bellicha, Alice, Chajès, Véronique, Huybrechts, Inge, Bard, Jean-Marie, Debras, Charlotte, Srour, Bernard, Sellem, Laury, Fezeu, Léopold K., Julia, Chantal, Kesse-Guyot, Emmanuelle, Agaësse, Cédric, Druesne-Pecollo, Nathalie, Galan, Pilar, Hercberg, Serge, 2023, Different Types of Industry-Produced and Ruminant Trans Fatty Acid Intake and Risk of Type 2 Diabetes: Findings From the NutriNet-Santé Prospective Cohort, Diabetes Care, 46, 2, 321–330, 10.2337/dc22-0900, 36542554, 255041911, It's also present in small amounts in caprine and bovine milk (very roughly 0.1% of the fatty acids)JOURNAL, Alonso L, Fontecha J, Lozada L, Fraga MJ, Juárez M, Fatty acid composition of caprine milk: major, branched-chain, and trans fatty acids, J. Dairy Sci., 82, 5, 878–84, 1999, 10342226, 10.3168/jds.S0022-0302(99)75306-3, 10261/113439, free, and in some meats.BOOK, Stillwell, William, 2016, An Introduction to Biological Membranes – Composition, Structure and Function, Chapter 23. Membranes and Human Health, Elsevier, 2, 10.1016/B978-0-444-63772-7.00023-3, Elaidic acid increases plasma cholesterylester transfer protein (CETP) activity which lowers HDL cholesterol.JOURNAL, Abbey M, Nestel PJ, Plasma cholesteryl ester transfer protein activity is increased when trans-elaidic acid is substituted for cis-oleic acid in the diet, Atherosclerosis, 106, 1, 99–107, 1994, 8018112, 10.1016/0021-9150(94)90086-8, See also Oleic acid References {{reflist}}{{Fatty acids}}