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Record Information
Creation date2011-09-21 00:32:22 UTC
Update date2020-09-17 15:33:14 UTC
Primary IDFDB023609
Secondary Accession NumbersNot Available
Chemical Information
FooDB Name9E,11E-Octadecadienoic acid
Description9E,11E-Octadecadienoic acid, also known as (e,e)-isolinoleic acid or (9E,11E)-9,11-octadecadienoate, belongs to the class of organic compounds known as lineolic acids and derivatives. These are derivatives of lineolic acid. Lineolic acid is a polyunsaturated omega-6 18 carbon long fatty acid, with two CC double bonds at the 9- and 12-positions. Conjugated linoleic acid (CLA) is an integral term for the mixture of positional and geometrical isomers of the octadecadienoic acids, whose two double-bonds are separated with one single-bond. The most common isomers are cis-9, trans-11, and trans-10, cis-12. 9E,11E-Octadecadienoic acid is a very hydrophobic molecule, practically insoluble in water, and relatively neutral. 9E,11E-Octadecadienoic acid has been detected in milk and dairy products (from cow) and red meat. This could make 9E,11E-octadecadienoic acid a potential biomarker for the consumption of these foods. Much attention has focused on the therapeutic potential of conjugated linoleic acid. Initial animal studies associated conjugated linoleic acid with beneficial health properties, such as reducing the risk of cancer, diabetes, atherosclerosis, inflammation, and obesity. More recent human CLA-supplementation studies have often shown conflicting and less convincing health benefits. The marked variation between studies may reflect the isomer-specific effect of the individual conjugated linoleic acid isomers, which can often have opposing effects. Detrimental effects have been observed in some studies, after supplementation with the trans-10, cis-12 conjugated linoleic acid isomer. Diet composition may modulate CLA effects on body fat accumulation. Contemporary dietary recommendations tend to limit red meat and dairy products and the possible CLA deficiencies must be compensated with dietary supplements. However, with human studies, a specific dietary pattern that controls and includes CLA has not been established. As a result, differences among studies and among subjects in the same study are likely. In rodents, the effects of CLA vary with genotype, suggesting that genetic predisposition to fat accumulation can play an important role in the effectiveness of CLA. Human volunteers with different body mass index have participated in the published studies and even in the same experiment. So, differences in lipid metabolism among subjects could help to explain the discrepancies observed in the literature. Age and maturity of the participants may also impact these studies (PMID: 17053429, 17217167, 17554969, 16477173).
CAS Number1839-11-8
9,11-Linoleic acidHMDB, MeSH
Conjugated linoleic acidHMDB
Nouracid de 554HMDB
Ricineic acidHMDB
Ricinenic acidHMDB
Selin claHMDB
9,11-Linoleic acid, (E,E)-isomerMeSH, HMDB
9,11-Isolinoleic acidMeSH, HMDB
Octadeca-9,11-dienoic acidMeSH, HMDB
9,11-OctadecadienoateMeSH, HMDB
(9E,11E)-9,11-Octadecadienoic acidHMDB, ChEBI
(9E,11E)-Octadecadienoic acidHMDB
9,11-Conjugated linoleic acidHMDB
9-trans,11-trans-Linoleic acidHMDB
9-trans,11-trans-Octadecadienoic acidHMDB, ChEBI
9E,11E-Octadecadienoic acidHMDB
delta9,11-Octadecadienoic acidHMDB
trans-11-trans-9-Octadecadienoic acidHMDB
trans-9,trans-11 Conjugated linoleic acidHMDB
trans-9,trans-11-Octadecadienoic acidHMDB
Δ9,11-Octadecadienoic acidHMDB
(E,E)-9,11-Octadecadienoic acidChEBI
(E,E)-Isolinoleic acidChEBI
9-trans, 11-trans-CLAChEBI
9-trans,11-trans-Conjugated linoleic acidChEBI
Conjugated (9E,11E)-linoleic acidChEBI
Isolinoleic acidChEBI
Mangold's acidChEBI
trans,trans-9,11-Octadecadienoic acidChEBI
trans-9, trans-11-Octadecadienoic acidChEBI
9-trans,11-trans-Conjugated linoleateGenerator
Conjugated (9E,11E)-linoleateGenerator
trans-9, trans-11-OctadecadienoateGenerator
Delta9,11-Octadecadienoic acidhmdb
Nouracid DE 554hmdb
Selin CLAhmdb
Predicted Properties
Water Solubility0.00015 g/LALOGPS
pKa (Strongest Acidic)4.99ChemAxon
Physiological Charge-1ChemAxon
Hydrogen Acceptor Count2ChemAxon
Hydrogen Donor Count1ChemAxon
Polar Surface Area37.3 ŲChemAxon
Rotatable Bond Count14ChemAxon
Refractivity88.52 m³·mol⁻¹ChemAxon
Polarizability37.12 ųChemAxon
Number of Rings0ChemAxon
Rule of FiveYesChemAxon
Ghose FilterYesChemAxon
Veber's RuleYesChemAxon
MDDR-like RuleYesChemAxon
Chemical FormulaC18H32O2
IUPAC name(9E,11E)-octadeca-9,11-dienoic acid
InChI IdentifierInChI=1S/C18H32O2/c1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18(19)20/h7-10H,2-6,11-17H2,1H3,(H,19,20)/b8-7+,10-9+
Average Molecular Weight280.4455
Monoisotopic Molecular Weight280.240230268
Description belongs to the class of organic compounds known as lineolic acids and derivatives. These are derivatives of lineolic acid. Lineolic acid is a polyunsaturated omega-6 18 carbon long fatty acid, with two CC double bonds at the 9- and 12-positions.
KingdomOrganic compounds
Super ClassLipids and lipid-like molecules
ClassFatty Acyls
Sub ClassLineolic acids and derivatives
Direct ParentLineolic acids and derivatives
Alternative Parents
  • Octadecanoid
  • Long-chain fatty acid
  • Fatty acid
  • Unsaturated fatty acid
  • Straight chain fatty acid
  • Monocarboxylic acid or derivatives
  • Carboxylic acid
  • Carboxylic acid derivative
  • Organic oxygen compound
  • Organic oxide
  • Hydrocarbon derivative
  • Organooxygen compound
  • Carbonyl group
  • Aliphatic acyclic compound
Molecular FrameworkAliphatic acyclic compounds
External Descriptors
Physiological effect

Health effect:


Route of exposure:


Biological location:


Naturally occurring process:


Industrial application:

Biological role:

Physico-Chemical Properties - Experimental
Physico-Chemical Properties - Experimental
Physical stateLiquid
Physical DescriptionNot Available
Mass CompositionNot Available
Melting PointNot Available
Boiling PointNot Available
Experimental Water SolubilityNot Available
Experimental logPNot Available
Experimental pKaNot Available
Isoelectric pointNot Available
ChargeNot Available
Optical RotationNot Available
Spectroscopic UV DataNot Available
DensityNot Available
Refractive IndexNot Available
Spectrum TypeDescriptionSplash KeyView
Predicted GC-MSPredicted GC-MS Spectrum - GC-MS (Non-derivatized) - 70eV, Positivesplash10-052f-9550000000-f91f775c11691e572339JSpectraViewer
Predicted GC-MSPredicted GC-MS Spectrum - GC-MS (1 TMS) - 70eV, Positivesplash10-0079-9531000000-ff0f0a6283e777000b03JSpectraViewer
LC-MS/MSLC-MS/MS Spectrum - ESI-TOF 20V, Negativesplash10-004i-0090000000-d3517fc9c425686f3f47JSpectraViewer | MoNA
LC-MS/MSLC-MS/MS Spectrum - ESI-TOF 10V, Negativesplash10-004i-0090000000-dfad2b4819a8e09aeb74JSpectraViewer | MoNA
LC-MS/MSLC-MS/MS Spectrum - ESI-TOF 10V, Negativesplash10-004i-0093020000-3713e3e16e9fc8ff9d4eJSpectraViewer | MoNA
LC-MS/MSLC-MS/MS Spectrum - ESI-TOF 30V, Negativesplash10-004i-0090000000-1ab95baf25a47f7edbbeJSpectraViewer | MoNA
LC-MS/MSLC-MS/MS Spectrum - ESI-TOF , Negativesplash10-004i-0091000000-88b67552039f5c14c7eaJSpectraViewer | MoNA
LC-MS/MSLC-MS/MS Spectrum - LC-ESI-TOF , negativesplash10-004i-0090000000-d3517fc9c425686f3f47JSpectraViewer | MoNA
LC-MS/MSLC-MS/MS Spectrum - LC-ESI-TOF , negativesplash10-004i-0090000000-dfad2b4819a8e09aeb74JSpectraViewer | MoNA
LC-MS/MSLC-MS/MS Spectrum - LC-ESI-TOF , negativesplash10-004i-0090000000-1ab95baf25a47f7edbbeJSpectraViewer | MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 10V, Positivesplash10-03di-0090000000-f2c6c9de24118516f0dbJSpectraViewer
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 20V, Positivesplash10-022j-5690000000-f4c090f44fe34f660b19JSpectraViewer
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 40V, Positivesplash10-006x-9830000000-42ee75da80e6ee682b90JSpectraViewer
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 10V, Negativesplash10-004i-0090000000-f1e9e4b543f7d4f48bf8JSpectraViewer
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 20V, Negativesplash10-01ti-0090000000-665523c6142ff4e39c96JSpectraViewer
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 40V, Negativesplash10-0a4l-9230000000-b43315d97b9995f922a3JSpectraViewer
ChemSpider ID4445923
ChEMBL IDNot Available
KEGG Compound IDNot Available
Pubchem Compound ID5282796
Pubchem Substance IDNot Available
ChEBI ID36025
Phenol-Explorer IDNot Available
DrugBank IDNot Available
CRC / DFC (Dictionary of Food Compounds) IDNot Available
EAFUS IDNot Available
Dr. Duke IDNot Available
BIGG IDNot Available
KNApSAcK IDNot Available
HET IDNot Available
Food Biomarker OntologyNot Available
VMH IDNot Available
Flavornet IDNot Available
GoodScent IDNot Available
SuperScent IDNot Available
Wikipedia IDConjugated linoleic acid
Phenol-Explorer Metabolite IDNot Available
Duplicate IDSNot Available
Old DFC IDSNot Available
Associated Foods
FoodContent Range AverageReference
Biological Effects and Interactions
Health Effects / BioactivitiesNot Available
EnzymesNot Available
PathwaysNot Available
MetabolismNot Available
BiosynthesisNot Available
Organoleptic Properties
FlavoursNot Available
MSDSNot Available
Synthesis ReferenceNot Available
General ReferenceNot Available
Content Reference