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Record Information
Version2.0
Created at2005-11-16 15:48:42 UTC
Updated at2025-02-11 15:45:24 UTC
NP-MRD IDNP0001132
Natural Product DOIhttps://doi.org/10.57994/0944
Secondary Accession NumbersNone
Natural Product Identification
Common NameStearic acid
DescriptionStearic acid, also known as octadecanoic acid or C18:0, Belongs to the class of organic compounds known as long-chain fatty acids. These are fatty acids with an aliphatic tail that contains between 13 and 21 carbon atoms. Stearic acid (its ester is called stearate) is a saturated fatty acid that has 18 carbons and is therefore a very hydrophobic molecule that is practically insoluble in water. It exists as a waxy solid. In terms of its biosynthesis, stearic acid is produced from carbohydrates via the fatty acid synthesis machinery wherein acetyl-CoA contributes two-carbon building blocks, up to the 16-carbon palmitate, via the enzyme complex fatty acid synthase (FA synthase), at which point a fatty acid elongase is needed to further lengthen it. After synthesis, there are a variety of reactions it may undergo, including desaturation to oleate via stearoyl-CoA desaturase (PMID: 16477801 ). Stearic acid is found in all living organisms ranging from bacteria to plants to animals. It is one of the useful types of saturated fatty acids that comes from many animal and vegetable fats and oils. For example, it is a component of cocoa butter and shea butter. It is used as a food additive, in cleaning and personal care products, and in lubricants. Its name comes from the Greek word stear, which means ‘tallow’ or ‘hard fat’.
Structure
Thumb
Synonyms
Chemical FormulaC18H36O2
Average Mass284.4772 Da
Monoisotopic Mass284.27153 Da
IUPAC Nameoctadecanoic acid
Traditional Namestearic acid
CAS Registry Number57-11-4
SMILES
CCCCCCCCCCCCCCCCCC(O)=O
InChI Identifier
InChI=1S/C18H36O2/c1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18(19)20/h2-17H2,1H3,(H,19,20)
InChI KeyQIQXTHQIDYTFRH-UHFFFAOYSA-N
Experimental Spectra
Predicted Spectra
Spectrum TypeDescriptionDepositor IDDepositor OrganizationDepositorDeposition DateView
Chemical Shift Submissions
Spectrum TypeDescriptionDepositor EmailDepositor OrganizationDepositorDeposition DateView
1D NMR1H NMR Spectrum (1D, 600, CD3OD, simulated)bgnzk@missouri.eduSumner Lab, MU Metabolomics Center, University of Missouri, Columbia. MO, USADr. Bharat Goel2024-05-09View Spectrum
1D NMR1H NMR Spectrum (1D, 500 MHz, CDCl3, simulated)v.dorna83@yahoo.comNot AvailableNot Available2021-07-25View Spectrum
Species
Species of Origin
Species Where Detected
Species NameSourceReference
Cordyceps sinensisKNApSAcK Database
Escherichia coliKNApSAcK Database
Homo sapiens (Serum)KNApSAcK Database
Homo sapiens (Urine)KNApSAcK Database
Chemical Taxonomy
Description Belongs to the class of organic compounds known as long-chain fatty acids. These are fatty acids with an aliphatic tail that contains between 13 and 21 carbon atoms.
KingdomOrganic compounds
Super ClassLipids and lipid-like molecules
ClassFatty Acyls
Sub ClassFatty acids and conjugates
Direct ParentLong-chain fatty acids
Alternative Parents
Substituents
  • Long-chain 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
Physical Properties
StateSolid
Experimental Properties
PropertyValueReference
Melting Point68.8 °CNot Available
Boiling Point183.00 to 184.00 °C. @ 1.00 mm HgThe Good Scents Company Information System
Water Solubility0.0006 mg/mLNot Available
LogP8.23Sangster, J. (1993). LOGKOW- a Databank of Evaluated Octanol-Water Partition Coefficients. Sangster Research Laboratories, Montreal.
Predicted Properties
PropertyValueSource
Water Solubility6.6e-05 g/LALOGPS
logP8.02ALOGPS
logP7.15ChemAxon
logS-6.6ALOGPS
pKa (Strongest Acidic)4.95ChemAxon
Physiological Charge-1ChemAxon
Hydrogen Acceptor Count2ChemAxon
Hydrogen Donor Count1ChemAxon
Polar Surface Area37.3 ŲChemAxon
Rotatable Bond Count16ChemAxon
Refractivity86.29 m³·mol⁻¹ChemAxon
Polarizability38.64 ųChemAxon
Number of Rings0ChemAxon
BioavailabilityNoChemAxon
Rule of FiveNoChemAxon
Ghose FilterNoChemAxon
Veber's RuleNoChemAxon
MDDR-like RuleNoChemAxon
HMDB IDHMDB0000827
DrugBank IDDB03193
Phenol Explorer Compound IDNot Available
FoodDB IDFDB031183
KNApSAcK IDC00001238
Chemspider ID5091
KEGG Compound IDC01530
BioCyc IDSTEARIC_ACID
BiGG ID37799
Wikipedia LinkStearic_acid
METLIN ID189
PubChem Compound5281
PDB IDNot Available
ChEBI ID28842
Good Scents IDrw1009271
References
General References