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Record Information
StatusDetected and Quantified
Creation Date2005-11-16 15:48:42 UTC
Update Date2017-10-23 17:14:53 UTC
Secondary Accession Numbers
  • HMDB00222
  • HMDB00846
Metabolite Identification
Common NameL-Palmitoylcarnitine
DescriptionL-Palmitoylcarnitine is a long-chain acyl fatty acid derivative ester of carnitine which facilitates the transfer of long-chain fatty acids from cytoplasm into mitochondria during the oxidation of fatty acids. L-palmitoylcarnitine, due to its amphipatic character is, like detergents, a surface-active molecule and by changing the membrane fluidity and surface charge can change activity of several enzymes and transporters localized in the membrane. L-palmitoylcarnitine has been also reported to change the activity of certain proteins. On the contrary to carnitine, palmitoylcarnitine was shown to stimulate the activity of caspases 3, 7 and 8 and the level of this long-chain acylcarnitine increased during apoptosis. Palmitoylcarnitine was also reported to diminish completely binding of phorbol esters, the protein kinase C activators and to decrease the autophosphorylation of the enzyme. Apart from these isoform nonspecific phenomena, palmitoylcarnitine was also shown to be responsible for retardation in cytoplasm of protein kinase C isoforms β and δ and, in the case of the latter one, to decrease its interaction with GAP-43. Some of the physico-chemical properties of palmitoylcarnitine may help to explain the need for coenzyme A-carnitine-coenzyme A acyl exchange during mitochondrial fatty acid import. The amphiphilic character of palmitoylcarnitine may also explain its proposed involvement in the pathogenesis of myocardial ischemia. L-Palmitoylcarnitine accumulates in ischemic myocardium and potentially contribute to myocardial damage through alterations in membrane molecular dynamics , one mechanism through which could play an important role in ischemic injury. Palmitoylcarnitine is characteristically elevated in carnitine palmitoyltransferase II deficiency, late-onset (OMIM 255110 ). (PMID 2540838 , 15363641 , 8706815 ).
Hexadecenoyl carnitineChEBI
L-Carnitine palmitoyl esterChEBI
(3R)-3-(Hexadecanoyloxy)-4-(trimethylazaniumyl)butanoic acidGenerator
(3R)-3-Palmitoyloxy-4-(trimethylammonio)butanoic acidGenerator
(3S)-3-Hexadecanoyloxy-4-(trimethylammonio)butanoic acidHMDB
(3S)-3-Palmitoyloxy-4-(trimethylammonio)butanoic acidHMDB
Palmitoyl D-carnitineHMDB
Chemical FormulaC23H45NO4
Average Molecular Weight399.6077
Monoisotopic Molecular Weight399.334858933
IUPAC Name(3R)-3-(hexadecanoyloxy)-4-(trimethylazaniumyl)butanoate
Traditional Namepalmitoylcarnitine
CAS Registry Number2364-67-2
InChI Identifier
Chemical Taxonomy
DescriptionThis compound belongs to the class of chemical entities known as acyl carnitines. These are organic compounds containing a fatty acid with the carboxylic acid attached to carnitine through an ester bond.
KingdomChemical entities
Super ClassOrganic compounds
ClassLipids and lipid-like molecules
Sub ClassFatty Acyls
Direct ParentAcyl carnitines
Alternative Parents
  • Acyl-carnitine
  • Dicarboxylic acid or derivatives
  • Tetraalkylammonium salt
  • Quaternary ammonium salt
  • Carboxylic acid ester
  • Carboxylic acid salt
  • Carboxylic acid derivative
  • Carboxylic acid
  • Organic nitrogen compound
  • Organooxygen compound
  • Organonitrogen compound
  • Organic salt
  • Hydrocarbon derivative
  • Organic oxide
  • Organopnictogen compound
  • Organic oxygen compound
  • Carbonyl group
  • Amine
  • Aliphatic acyclic compound
Molecular FrameworkAliphatic acyclic compounds
External Descriptors
Physiological effect

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  Biofluid and excreta:




Route of exposure:



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  Biological process:

    Biochemical pathway:

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Indirect biological role:

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Physical Properties
Experimental Properties
Melting PointNot AvailableNot Available
Boiling PointNot AvailableNot Available
Water SolubilityNot AvailableNot Available
LogPNot AvailableNot Available
Predicted Properties
Water Solubility1.2e-05 g/LALOGPS
pKa (Strongest Acidic)4.22ChemAxon
pKa (Strongest Basic)-7.1ChemAxon
Physiological Charge0ChemAxon
Hydrogen Acceptor Count3ChemAxon
Hydrogen Donor Count0ChemAxon
Polar Surface Area66.43 ŲChemAxon
Rotatable Bond Count20ChemAxon
Refractivity137.08 m³·mol⁻¹ChemAxon
Polarizability50.41 ųChemAxon
Number of Rings0ChemAxon
Rule of FiveYesChemAxon
Ghose FilterYesChemAxon
Veber's RuleYesChemAxon
MDDR-like RuleYesChemAxon
Spectrum TypeDescriptionSplash Key
Predicted GC-MSPredicted GC-MS Spectrum - GC-MS (Non-derivatized) - 70eV, Positivesplash10-00di-9220000000-890219021b84f6894540View in MoNA
LC-MS/MSLC-MS/MS Spectrum - Quattro_QQQ 10V, Positive (Annotated)splash10-0udi-1000900000-109f35c9819eb5eed7b7View in MoNA
LC-MS/MSLC-MS/MS Spectrum - Quattro_QQQ 25V, Positive (Annotated)splash10-000i-9000000000-9d6bb14eddb4cfa8341aView in MoNA
LC-MS/MSLC-MS/MS Spectrum - Quattro_QQQ 40V, Positive (Annotated)splash10-000i-9000000000-87b1d0debe4e0cb7bd31View in MoNA
LC-MS/MSLC-MS/MS Spectrum - Linear Ion Trap , negativesplash10-014i-0139500000-21c36c851939b94d4523View in MoNA
LC-MS/MSLC-MS/MS Spectrum - Linear Ion Trap , negativesplash10-014i-0029600000-69ebe292c2ce42c8d810View in MoNA
LC-MS/MSLC-MS/MS Spectrum - Linear Ion Trap , positivesplash10-0f6x-0139600000-197944fd1aa4ac44bdd2View in MoNA
LC-MS/MSLC-MS/MS Spectrum - Linear Ion Trap , positivesplash10-0uxr-0000613900-006582b143e5906e51ccView in MoNA
LC-MS/MSLC-MS/MS Spectrum - Linear Ion Trap , positivesplash10-0uxr-0000614900-14a5d773f652b71671fbView in MoNA
LC-MS/MSLC-MS/MS Spectrum - Linear Ion Trap , positivesplash10-0f6x-0139600000-b0528be9c13e412551afView in MoNA
1D NMR1H NMR SpectrumNot AvailableView in JSpectraViewer
2D NMR[1H,13C] 2D NMR SpectrumNot AvailableView in JSpectraViewer
Biological Properties
Cellular Locations
  • Cytoplasm
  • Extracellular
  • Membrane
  • Mitochondria
Biofluid Locations
  • Blood
  • Feces
  • Saliva
  • Urine
Tissue LocationNot Available
Carnitine palmitoyl transferase deficiency (I)Pw000514Pw000514 greyscalePw000514 simpleNot Available
Carnitine palmitoyl transferase deficiency (II)Pw000517Pw000517 greyscalePw000517 simpleNot Available
Ethylmalonic EncephalopathyPw000106Pw000106 greyscalePw000106 simpleNot Available
Fatty Acid MetabolismPw000023Pw000023 greyscalePw000023 simpleMap00071
Glutaric Aciduria Type IPw000107Pw000107 greyscalePw000107 simpleNot Available
Normal Concentrations
BloodDetected and Quantified0.153 (0.073-0.227) uMChildren (1-13 years old)BothNormal details
BloodDetected and Quantified0.113 +/- 0.006 uMAdult (>18 years old)BothNormal details
BloodDetected and Quantified0.11 +/- 0.03 uMAdult (>18 years old)BothNormal details
BloodDetected and Quantified0.12(0.03) uMAdult (>18 years old)BothNormal details
BloodDetected and Quantified0.050-0.180 uMAdult (>18 years old)Both
FecesDetected but not Quantified Adult (>18 years old)BothNormal details
SalivaDetected and Quantified0.034 +/- 0.012 uMAdult (>18 years old)BothNormal
    • Zerihun T. Dame, ...
UrineDetected and Quantified0.0022 (0.0020-0.0030) umol/mmol creatinineAdult (>18 years old)Both
UrineDetected and Quantified0.006 +/- 0.0018 umol/mmol creatinineChildren (1 - 13 years old)Not Specified
    • Mordechai, Hien, ...
UrineDetected and Quantified0.5 umol/mmol creatinineAdult (>18 years old)BothNormal details
Abnormal Concentrations
BloodDetected and Quantified1.909 (1.012-2.233) uMAdult (>18 years old)BothVery long-chain acyl-CoA dehydrogenase deficiency (vLCAD) details
BloodDetected and Quantified0.097 +/- 0.006 uMAdult (>18 years old)BothCeliac disease details
BloodDetected and Quantified0.046 (0.0375) uMAdult (>18 years old)FemalePregnancy with fetus having congenital heart defect details
BloodDetected and Quantified0.14(0.04) uMAdult (>18 years old)BothHeart failure with preserved ejection fraction details
FecesDetected but not Quantified Adult (>18 years old)Bothliver cirrhosis details
UrineDetected and Quantified0.0046 +/- 0.0018 umol/mmol creatinineChildren (1 - 13 years old)Not Specified
Eosinophilic esophagitis
    • Mordechai, Hien, ...
UrineDetected and Quantified0.0064 +/- 0.0047 umol/mmol creatinineChildren (1 - 13 years old)Not Specified
Gastroesophageal reflux disease
    • Mordechai, Hien, ...
Associated Disorders and Diseases
Disease References
Very Long Chain Acyl-CoA Dehydrogenase Deficiency
  1. Costa CG, Struys EA, Bootsma A, ten Brink HJ, Dorland L, Tavares de Almeida I, Duran M, Jakobs C: Quantitative analysis of plasma acylcarnitines using gas chromatography chemical ionization mass fragmentography. J Lipid Res. 1997 Jan;38(1):173-82. [PubMed:9034211 ]
Celiac disease
  1. Bene J, Komlosi K, Gasztonyi B, Juhasz M, Tulassay Z, Melegh B: Plasma carnitine ester profile in adult celiac disease patients maintained on long-term gluten free diet. World J Gastroenterol. 2005 Nov 14;11(42):6671-5. [PubMed:16425363 ]
Associated OMIM IDs
DrugBank IDNot Available
DrugBank Metabolite IDNot Available
Phenol Explorer Compound IDNot Available
Phenol Explorer Metabolite IDNot Available
FoodDB IDFDB021910
KNApSAcK IDNot Available
Chemspider ID10128117
KEGG Compound IDC02990
BioCyc IDCPD-419
BiGG ID40966
Wikipedia LinkNot Available
PubChem Compound11953816
PDB IDNot Available
ChEBI ID17490
Synthesis ReferenceNorum, Kaare R. Palmityl coenzyme A-carnitine palmityltransferase. Purification from calf-liver mitochondria and some properties of the enzyme. Biochimica et Biophysica Acta, Specialized Section on Enzymological Subjects (1964), 89(1), 95-108.
Material Safety Data Sheet (MSDS)Not Available
General References
  1. Kamimori H, Hamashima Y, Konishi M: Determination of carnitine and saturated-acyl group carnitines in human urine by high-performance liquid chromatography with fluorescence detection. Anal Biochem. 1994 May 1;218(2):417-24. [PubMed:8074302 ]
  2. Mueller P, Schulze A, Schindler I, Ethofer T, Buehrdel P, Ceglarek U: Validation of an ESI-MS/MS screening method for acylcarnitine profiling in urine specimens of neonates, children, adolescents and adults. Clin Chim Acta. 2003 Jan;327(1-2):47-57. [PubMed:12482618 ]
  3. Moder M, Kiessling A, Loster H, Bruggemann L: The pattern of urinary acylcarnitines determined by electrospray mass spectrometry: a new tool in the diagnosis of diabetes mellitus. Anal Bioanal Chem. 2003 Jan;375(2):200-10. Epub 2003 Jan 4. [PubMed:12560963 ]
  4. Wasant P, Matsumoto I, Naylor E, Liammongkolkul S: Mitochondrial fatty acid oxidation disorders in Thai infants: a report of 3 cases. J Med Assoc Thai. 2002 Aug;85 Suppl 2:S710-9. [PubMed:12403251 ]
  5. Young SP, Matern D, Gregersen N, Stevens RD, Bali D, Liu HM, Koeberl DD, Millington DS: A comparison of in vitro acylcarnitine profiling methods for the diagnosis of classical and variant short chain acyl-CoA dehydrogenase deficiency. Clin Chim Acta. 2003 Nov;337(1-2):103-13. [PubMed:14568186 ]
  6. Poorthuis BJ, Jille-Vlckova T, Onkenhout W: Determination of acylcarnitines in urine of patients with inborn errors of metabolism using high-performance liquid chromatography after derivatization with 4'-bromophenacylbromide. Clin Chim Acta. 1993 Jul 16;216(1-2):53-61. [PubMed:8222273 ]
  7. Bhuiyan AK, Jackson S, Turnbull DM, Aynsley-Green A, Leonard JV, Bartlett K: The measurement of carnitine and acyl-carnitines: application to the investigation of patients with suspected inherited disorders of mitochondrial fatty acid oxidation. Clin Chim Acta. 1992 May 15;207(3):185-204. [PubMed:1327583 ]
  8. Nalecz KA, Miecz D, Berezowski V, Cecchelli R: Carnitine: transport and physiological functions in the brain. Mol Aspects Med. 2004 Oct-Dec;25(5-6):551-67. [PubMed:15363641 ]
  9. Watanabe H, Kobayashi A, Hayashi H, Yamazaki N: Effects of long-chain acyl carnitine on membrane fluidity of human erythrocytes. Biochim Biophys Acta. 1989 Apr 28;980(3):315-8. [PubMed:2540838 ]
  10. Goni FM, Requero MA, Alonso A: Palmitoylcarnitine, a surface-active metabolite. FEBS Lett. 1996 Jul 15;390(1):1-5. [PubMed:8706815 ]


General function:
Involved in acyltransferase activity
Specific function:
Not Available
Gene Name:
Uniprot ID:
Molecular weight:
hexadecanoyl-CoA + L-Carnitine → Coenzyme A + L-Palmitoylcarnitinedetails
General function:
Involved in acyltransferase activity
Specific function:
Catalyzes the transfer of the acyl group of long-chain fatty acid-CoA conjugates onto carnitine, an essential step for the mitochondrial uptake of long-chain fatty acids and their subsequent beta-oxidation in the mitochondrion. Plays an important role in triglyceride metabolism.
Gene Name:
Uniprot ID:
Molecular weight:
hexadecanoyl-CoA + L-Carnitine → Coenzyme A + L-Palmitoylcarnitinedetails
General function:
Involved in acyltransferase activity
Specific function:
Not Available
Gene Name:
Uniprot ID:
Molecular weight:
hexadecanoyl-CoA + L-Carnitine → Coenzyme A + L-Palmitoylcarnitinedetails
General function:
Involved in acyltransferase activity
Specific function:
Not Available
Gene Name:
Uniprot ID:
Molecular weight:
hexadecanoyl-CoA + L-Carnitine → Coenzyme A + L-Palmitoylcarnitinedetails
General function:
Involved in catalytic activity
Specific function:
Activation of long-chain fatty acids for both synthesis of cellular lipids, and degradation via beta-oxidation. Preferentially uses palmitoleate, oleate and linoleate.
Gene Name:
Uniprot ID:
Molecular weight: