Record Information
Version 1.0
Update Date 1/22/2018 11:54:54 AM
Metabolite IDPAMDB000140
Name: Caprylic acid
Description:Caprylic acid belongs to the class of Straight Chain Fatty Acids. These are fatty acids with a straight aliphatic chain. (inferred from compound structure). Caprylic acid is the common name for the eight-carbon saturated fatty acid known by the systematic name octanoic acid. (WikiPedia). Caprylic acid is an intermediate in lipoate biosynthesis and incorporation II in Pseudomonas aeruginosa. It is a substrate for lipoate-protein ligase A which catalyzes the chemical reaction a [lipoyl-carrier protein]-L-lysine + caprylic acid + ATP -> a [lipoyl-carrier protein] N6-octanoyl-L-lysine + AMP + diphosphate + H+. It is also a substrate for acyl-ACP synthetase in the reaction caprylic acid + a holo-[acyl-carrier protein] + ATP ??an octanoyl-[acp] + AMP + diphosphate (EcoCyc compound: CPD-195).
  • 1-Heptanecarboxylate
  • 1-Heptanecarboxylic acid
  • C-8 Acid
  • Caprylate
  • Caprylic acid
  • Capryloate
  • Capryloic acid
  • Emery 657
  • Kortacid 0899
  • Lunac 8-95
  • Lunac 8-98
  • N-Caprylate
  • N-Caprylic acid
  • N-Octanoate
  • N-Octanoic acid
  • N-Octate
  • N-Octic acid
  • N-Octoate
  • N-Octoic acid
  • N-Octylate
  • N-Octylic acid
  • Neo-Fat 8
  • Neo-Fat 8S
  • Octanoate
  • Octanoate (N-C8:0)
  • Octanoic acid
  • Octanoic acid (N-C8:0)
  • Octoate
  • Octoic acid
  • Octylate
  • Octylic acid
  • Prifac 2901
Chemical Formula: C8H16O2
Average Molecular Weight: 144.2114
Monoisotopic Molecular Weight: 144.115029756
CAS number: 124-07-2
IUPAC Name:octanoic acid
Traditional IUPAC Name: caprylic acid
Chemical Taxonomy
Taxonomy DescriptionThis compound belongs to the class of organic compounds known as medium-chain fatty acids. These are fatty acids with an aliphatic tail that contains between 4 and 12 carbon atoms.
Kingdom Organic compounds
Super ClassLipids and lipid-like molecules
Class Fatty Acyls
Sub ClassFatty acids and conjugates
Direct Parent Medium-chain fatty acids
Alternative Parents
  • Medium-chain fatty acid
  • Straight chain fatty acid
  • Monocarboxylic acid or derivatives
  • Carboxylic acid
  • Carboxylic acid derivative
  • Hydrocarbon derivative
  • Organooxygen compound
  • Carbonyl group
  • Aliphatic acyclic compound
Molecular Framework Aliphatic acyclic compounds
External Descriptors
Physical Properties
State: Liquid
Melting point: 16.5 °C
Experimental Properties:
Water Solubility:0.789 mg/ml [YALKOWSKY,SH & DANNENFELSER,RM (1992)]PhysProp
Predicted Properties
Water Solubility0.907 mg/mLALOGPS
pKa (Strongest Acidic)5.19ChemAxon
Physiological Charge-1ChemAxon
Hydrogen Acceptor Count2ChemAxon
Hydrogen Donor Count1ChemAxon
Polar Surface Area37.3 Å2ChemAxon
Rotatable Bond Count6ChemAxon
Refractivity40.28 m3·mol-1ChemAxon
Polarizability17.4 Å3ChemAxon
Number of Rings0ChemAxon
Rule of FiveYesChemAxon
Ghose FilterYesChemAxon
Veber's RuleYesChemAxon
MDDR-like RuleYesChemAxon
Biological Properties
Cellular Locations: Cytoplasm
Spectrum TypeDescriptionSplash Key
GC-MSGC-MS Spectrum - GC-EI-TOF (Pegasus III TOF-MS system, Leco; GC 6890, Agilent Technologies)splash10-0159-0910000000-e609d5de69ede6fbcde0View in MoNA
GC-MSGC-MS Spectrum - GC-MS (1 TMS)splash10-0gb9-1920000000-1dc6ed976e003f99e23dView in MoNA
GC-MSGC-MS Spectrum - GC-MSNot Available
LC-MS/MSLC-MS/MS Spectrum - Quattro_QQQ 10V, Negative (Annotated)splash10-0006-0900000000-bb237630bedcee6145d1View in MoNA
LC-MS/MSLC-MS/MS Spectrum - Quattro_QQQ 25V, Negative (Annotated)splash10-0006-2900000000-98284f50a271878c8481View in MoNA
LC-MS/MSLC-MS/MS Spectrum - Quattro_QQQ 40V, Negative (Annotated)splash10-0006-5900000000-209fbbacd4996b9a770dView in MoNA
LC-MS/MSLC-MS/MS Spectrum - EI-B (HITACHI M-80B) , Positivesplash10-03kc-9000000000-74cfce03769b41313952View in MoNA
LC-MS/MSLC-MS/MS Spectrum - LC-ESI-QQ (API3000, Applied Biosystems) 10V, Negativesplash10-0006-0900000000-e2c4dff10393086340f7View in MoNA
LC-MS/MSLC-MS/MS Spectrum - LC-ESI-QQ (API3000, Applied Biosystems) 20V, Negativesplash10-0006-1900000000-bbde8564b4e5543a636aView in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 10V, PositiveNot Available
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 20V, PositiveNot Available
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 40V, PositiveNot Available
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 10V, NegativeNot Available
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 20V, NegativeNot Available
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 40V, NegativeNot Available
MSMass Spectrum (Electron Ionization)splash10-03kc-9000000000-8c7db9a9d75b2cc1bd1cView in MoNA
1D NMR1H NMR SpectrumNot Available
1D NMR1H NMR SpectrumNot Available
1D NMR13C NMR SpectrumNot Available
1D NMR1H NMR SpectrumNot Available
1D NMR13C NMR SpectrumNot Available
2D NMR[1H,13C] 2D NMR SpectrumNot Available
  • Dieterle F, Muller-Hagedorn S, Liebich HM, Gauglitz G: Urinary nucleosides as potential tumor markers evaluated by learning vector quantization. Artif Intell Med. 2003 Jul;28(3):265-79. Pubmed: 12927336
  • Giannakou SA, Dallas PP, Rekkas DM, Choulis NH: In vitro evaluation of nimodipine permeation through human epidermis using response surface methodology. Int J Pharm. 2002 Jul 8;241(1):27-34. Pubmed: 12086718
  • Habeeb AF, Francis RD: Preparation of human immunoglobulin by caprylic acid precipitation. Prep Biochem. 1984;14(1):1-17. Pubmed: 6718324
  • Hoffmann GF, Meier-Augenstein W, Stockler S, Surtees R, Rating D, Nyhan WL: Physiology and pathophysiology of organic acids in cerebrospinal fluid. J Inherit Metab Dis. 1993;16(4):648-69. Pubmed: 8412012
  • Kanehisa, M., Goto, S., Sato, Y., Furumichi, M., Tanabe, M. (2012). "KEGG for integration and interpretation of large-scale molecular data sets." Nucleic Acids Res 40:D109-D114. Pubmed: 22080510
  • Keseler, I. M., Collado-Vides, J., Santos-Zavaleta, A., Peralta-Gil, M., Gama-Castro, S., Muniz-Rascado, L., Bonavides-Martinez, C., Paley, S., Krummenacker, M., Altman, T., Kaipa, P., Spaulding, A., Pacheco, J., Latendresse, M., Fulcher, C., Sarker, M., Shearer, A. G., Mackie, A., Paulsen, I., Gunsalus, R. P., Karp, P. D. (2011). "EcoCyc: a comprehensive database of Escherichia coli biology." Nucleic Acids Res 39:D583-D590. Pubmed: 21097882
  • Nair MK, Joy J, Venkitanarayanan KS: Inactivation of Enterobacter sakazakii in reconstituted infant formula by monocaprylin. J Food Prot. 2004 Dec;67(12):2815-9. Pubmed: 15633694
  • Winder, C. L., Dunn, W. B., Schuler, S., Broadhurst, D., Jarvis, R., Stephens, G. M., Goodacre, R. (2008). "Global metabolic profiling of Escherichia coli cultures: an evaluation of methods for quenching and extraction of intracellular metabolites." Anal Chem 80:2939-2948. Pubmed: 18331064
  • Yurtsever D. (2007). Fatty acid methyl ester profiling of Enterococcus and Esherichia coli for microbial source tracking. Thesis. Villanova University: U.S.A
Synthesis Reference: Caprylic acid. Jpn. Kokai Tokkyo Koho (1983), 4 pp.
Material Safety Data Sheet (MSDS) Download (PDF)
External Links:
Pubchem Compound ID379
Kegg IDC06423
ChemSpider ID370
WikipediaCaprylic acid
BioCyc IDCPD-195
EcoCyc IDCPD-195
Ligand ExpoOCA


General function:
Involved in catalytic activity
Specific function:
Catalyzes the esterification, concomitant with transport, of exogenous long-chain fatty acids into metabolically active CoA thioesters for subsequent degradation or incorporation into phospholipids
Gene Name:
Locus Tag:
Molecular weight:
61.7 kDa
ATP + a long-chain fatty acid + CoA = AMP + diphosphate + an acyl-CoA.
General function:
Involved in acyl-CoA hydrolase activity
Specific function:
Can hydrolyze a broad range of acyl-CoA thioesters. Its physiological function is not known
Gene Name:
Locus Tag:
Molecular weight:
32.9 kDa
General function:
Involved in fatty acid biosynthetic process
Specific function:
Carrier of the growing fatty acid chain in fatty acid biosynthesis
Gene Name:
Locus Tag:
Molecular weight:
8.7 kDa