Record Information
Version1.0
Creation Date2016-09-30 22:39:31 UTC
Update Date2020-06-04 19:11:16 UTC
BMDB IDBMDB0000990
Secondary Accession Numbers
  • BMDB00990
Metabolite Identification
Common NameAcetaldehyde
DescriptionAcetaldehyde, also known as ethanal, belongs to the class of organic compounds known as short-chain aldehydes. These are an aldehyde with a chain length containing between 2 and 5 carbon atoms. Acetaldehyde exists as a solid, possibly soluble (in water), and an extremely weak basic (essentially neutral) compound (based on its pKa) molecule. Acetaldehyde exists in all living species, ranging from bacteria to humans. Acetaldehyde is formally rated as a possible carcinogen (by IARC 2B) and is also a potentially toxic compound. Acetaldehyde has been found to be associated with several diseases known as nonalcoholic fatty liver disease, ulcerative colitis, alcoholism, and crohn's disease; also acetaldehyde has been linked to the inborn metabolic disorders including aldehyde dehydrogenase deficiency.
Structure
Thumb
Synonyms
ValueSource
AcetaldehydChEBI
AcetaldehydesChEBI
Acetic aldehydeChEBI
AzetaldehydChEBI
EthanalChEBI
Ethyl aldehydeChEBI
AldehydeHMDB
Chemical FormulaC2H4O
Average Molecular Weight44.0526
Monoisotopic Molecular Weight44.02621475
IUPAC Nameacetaldehyde
Traditional Nameacetaldehyde
CAS Registry Number75-07-0
SMILES
CC=O
InChI Identifier
InChI=1S/C2H4O/c1-2-3/h2H,1H3
InChI KeyIKHGUXGNUITLKF-UHFFFAOYSA-N
Chemical Taxonomy
Description belongs to the class of organic compounds known as short-chain aldehydes. These are an aldehyde with a chain length containing between 2 and 5 carbon atoms.
KingdomOrganic compounds
Super ClassOrganic oxygen compounds
ClassOrganooxygen compounds
Sub ClassCarbonyl compounds
Direct ParentShort-chain aldehydes
Alternative Parents
Substituents
  • Organic oxide
  • Hydrocarbon derivative
  • Short-chain aldehyde
  • Aliphatic acyclic compound
Molecular FrameworkAliphatic acyclic compounds
External Descriptors
Ontology
StatusDetected and Quantified
Origin
  • Endogenous
  • Exogenous
BiofunctionNot Available
ApplicationNot Available
Cellular locations
  • Cytoplasm
  • Endoplasmic reticulum
  • Mitochondria
  • Myelin sheath
  • Peroxisome
Physical Properties
StateLiquid
Experimental Properties
PropertyValueReference
Melting Point-123 °CNot Available
Boiling PointNot AvailableNot Available
Water Solubility1000.0 mg/mLNot Available
LogP-0.34TSCATS
Predicted Properties
PropertyValueSource
logP-0.01ALOGPS
logP-0.38ChemAxon
logS0.71ALOGPS
pKa (Strongest Acidic)16.73ChemAxon
pKa (Strongest Basic)-6.9ChemAxon
Physiological Charge0ChemAxon
Hydrogen Acceptor Count1ChemAxon
Hydrogen Donor Count0ChemAxon
Polar Surface Area17.07 ŲChemAxon
Rotatable Bond Count0ChemAxon
Refractivity11.72 m³·mol⁻¹ChemAxon
Polarizability4.48 ųChemAxon
Number of Rings0ChemAxon
BioavailabilityYesChemAxon
Rule of FiveYesChemAxon
Ghose FilterYesChemAxon
Veber's RuleYesChemAxon
MDDR-like RuleYesChemAxon
Spectra
Spectra
Biological Properties
Cellular Locations
  • Cytoplasm
  • Endoplasmic reticulum
  • Mitochondria
  • Myelin sheath
  • Peroxisome
Biospecimen Locations
  • Adrenal Medulla
  • Brain
  • Epidermis
  • Erythrocyte
  • Fibroblasts
  • Intestine
  • Kidney
  • Liver
  • Milk
  • Neuron
  • Ovary
  • Pancreas
  • Placenta
  • Platelet
  • Skeletal Muscle
  • Testis
  • Thyroid Gland
Pathways
Normal Concentrations
BiospecimenStatusValueAgeSexConditionReferenceDetails
Adrenal MedullaExpected but not QuantifiedNot QuantifiedNot SpecifiedNot SpecifiedNormal
  • Not Applicable
details
BrainExpected but not QuantifiedNot QuantifiedNot SpecifiedNot SpecifiedNormal
  • Not Applicable
details
EpidermisExpected but not QuantifiedNot QuantifiedNot SpecifiedNot SpecifiedNormal
  • Not Applicable
details
ErythrocyteExpected but not QuantifiedNot QuantifiedNot SpecifiedNot SpecifiedNormal
  • Not Applicable
details
FibroblastsExpected but not QuantifiedNot QuantifiedNot SpecifiedNot SpecifiedNormal
  • Not Applicable
details
IntestineExpected but not QuantifiedNot QuantifiedNot SpecifiedNot SpecifiedNormal
  • Not Applicable
details
KidneyExpected but not QuantifiedNot QuantifiedNot SpecifiedNot SpecifiedNormal
  • Not Applicable
details
LiverExpected but not QuantifiedNot QuantifiedNot SpecifiedNot SpecifiedNormal
  • Not Applicable
details
MilkDetected and Quantified2.01 +/- 2.89 mg/100g dry matter contentNot SpecifiedNot Specified
Normal
    • Brigitta Gaspardo...
details
MilkDetected and Quantified1.44 +/- 1.47 mg/100g dry matter contentNot SpecifiedNot Specified
Normal
    • Brigitta Gaspardo...
details
MilkDetected and Quantified0.0638 +/- 0.0365 uMNot SpecifiedNot Specified
Normal
details
MilkDetected and Quantified0.0788 +/- 0.0498 uMNot SpecifiedNot Specified
Normal
details
MilkDetected and Quantified0.0900 +/- 0.0521 uMNot SpecifiedNot Specified
Normal
details
NeuronExpected but not QuantifiedNot QuantifiedNot SpecifiedNot SpecifiedNormal
  • Not Applicable
details
OvaryExpected but not QuantifiedNot QuantifiedNot SpecifiedNot SpecifiedNormal
  • Not Applicable
details
PancreasExpected but not QuantifiedNot QuantifiedNot SpecifiedNot SpecifiedNormal
  • Not Applicable
details
PlacentaExpected but not QuantifiedNot QuantifiedNot SpecifiedNot SpecifiedNormal
  • Not Applicable
details
PlateletExpected but not QuantifiedNot QuantifiedNot SpecifiedNot SpecifiedNormal
  • Not Applicable
details
Skeletal MuscleExpected but not QuantifiedNot QuantifiedNot SpecifiedNot SpecifiedNormal
  • Not Applicable
details
TestisExpected but not QuantifiedNot QuantifiedNot SpecifiedNot SpecifiedNormal
  • Not Applicable
details
Thyroid GlandExpected but not QuantifiedNot QuantifiedNot SpecifiedNot SpecifiedNormal
  • Not Applicable
details
Abnormal Concentrations
Not Available
HMDB IDHMDB0000990
DrugBank IDNot Available
Phenol Explorer Compound IDNot Available
FooDB IDFDB008297
KNApSAcK IDC00007392
Chemspider ID172
KEGG Compound IDC00084
BioCyc IDACETALD
BiGG ID33792
Wikipedia LinkAcetaldehyde
METLIN ID3200
PubChem Compound177
PDB IDNot Available
ChEBI ID15343
References
Synthesis ReferenceWertheim, E. Laboratory preparation of acetaldehyde. Journal of the American Chemical Society (1922), 44 2658-9.
Material Safety Data Sheet (MSDS)Not Available
General References
  1. Toso B, Procida G, Stefanon B: Determination of volatile compounds in cows' milk using headspace GC-MS. J Dairy Res. 2002 Nov;69(4):569-77. [PubMed:12463694 ]
  2. Brigitta Gaspardo, Giuseppe Procida, Saša Volarič, Sandy Sgorlon & Bruno Stefanon (2009). Brigitta Gaspardo et al. Determination of volatile fractions in raw milk and ripened cheese by means of GC-MS. Results of a survey performed in the marginal area between Italy and Slovenia. Italian Jounal of Animal Science Vol 8, 377-390, 2009. Italian Journal of Animal Science .

Enzymes

General function:
Inorganic ion transport and metabolism
Specific function:
Occurs in almost all aerobically respiring organisms and serves to protect cells from the toxic effects of hydrogen peroxide. Promotes growth of cells.
Gene Name:
CAT
Uniprot ID:
P00432
Molecular weight:
59915.0
Reactions
Ethanol + Hydrogen peroxide → Acetaldehyde +2 Waterdetails
General function:
Nucleotide transport and metabolism
Specific function:
Catalyzes a reversible aldol reaction between acetaldehyde and D-glyceraldehyde 3-phosphate to generate 2-deoxy-D-ribose 5-phosphate. Participates in stress granule (SG) assembly. May allow ATP production from extracellular deoxyinosine in conditions of energy deprivation.
Gene Name:
DERA
Uniprot ID:
Q3T0V9
Molecular weight:
35246.0
Reactions
D-Glyceraldehyde 3-phosphate + Acetaldehyde → Deoxyribose 5-phosphatedetails
General function:
Energy production and conversion
Specific function:
Converts gamma-trimethylaminobutyraldehyde into gamma-butyrobetaine with high efficiency (in vitro). Can catalyze the irreversible oxidation of a broad range of aldehydes to the corresponding acids in an NAD-dependent reaction, but with low efficiency.
Gene Name:
ALDH9A1
Uniprot ID:
Q2KJH9
Molecular weight:
53977.0
General function:
Energy production and conversion
Specific function:
Can convert/oxidize retinaldehyde to retinoic acid. Binds free retinal and cellular retinol-binding protein-bound retinal. May have a broader specificity and oxidize other aldehydes in vivo.
Gene Name:
ALDH1A1
Uniprot ID:
P48644
Molecular weight:
54806.0
General function:
Nucleotide transport and metabolism
Specific function:
Oxidase with broad substrate specificity, oxidizing aromatic azaheterocycles, such as N1-methylnicotinamide, N-methylphthalazinium and phthalazine, as well as aldehydes, such as benzaldehyde, retinal, pyridoxal, and vanillin. Plays a key role in the metabolism of xenobiotics and drugs containing aromatic azaheterocyclic substituents. Is probably involved in the regulation of reactive oxygen species homeostasis. May be a prominent source of superoxide generation via the one-electron reduction of molecular oxygen. Also may catalyze nitric oxide (NO) production via the reduction of nitrite to NO with NADH or aldehyde as electron donor. May play a role in adipogenesis.
Gene Name:
AOX1
Uniprot ID:
P48034
Molecular weight:
147611.0
General function:
Energy production and conversion
Specific function:
ALDHs play a major role in the detoxification of alcohol-derived acetaldehyde (Probable). They are involved in the metabolism of corticosteroids, biogenic amines, neurotransmitters, and lipid peroxidation (Probable). Oxidizes medium and long chain aldehydes into non-toxic fatty acids (By similarity). Preferentially oxidizes aromatic aldehyde substrates (By similarity). Comprises about 50 percent of corneal epithelial soluble proteins (By similarity). May play a role in preventing corneal damage caused by ultraviolet light (By similarity).
Gene Name:
ALDH3A1
Uniprot ID:
P30907
Molecular weight:
26743.0
General function:
Involved in alcohol dehydrogenase (NADP+) activity
Specific function:
Catalyzes the NADPH-dependent reduction of a wide variety of carbonyl-containing compounds to their corresponding alcohols. Displays enzymatic activity towards endogenous metabolites such as aromatic and aliphatic aldehydes, ketones, monosaccharides and bile acids, with a preference for negatively charged substrates, such as glucuronate and succinic semialdehyde (By similarity). Plays an important role in ascorbic acid biosynthesis by catalyzing the reduction of D-glucuronic acid and D-glucurono-gamma-lactone (By similarity). Functions as a detoxifiying enzyme by reducing a range of toxic aldehydes. Reduces methylglyoxal and 3-deoxyglucosone, which are present at elevated levels under hyperglycemic conditions and are cytotoxic. Involved also in the detoxification of lipid-derived aldehydes like acrolein (By similarity). Plays a role in the activation of procarcinogens, such as polycyclic aromatic hydrocarbon trans-dihydrodiols, and in the metabolism of various xenobiotics and drugs (By similarity). Displays no reductase activity towards retinoids (By similarity).
Gene Name:
AKR1A1
Uniprot ID:
Q3ZCJ2
Molecular weight:
36617.0
General function:
Energy production and conversion
Specific function:
ALDHs play a major role in the detoxification of alcohol-derived acetaldehyde. They are involved in the metabolism of corticosteroids, biogenic amines, neurotransmitters, and lipid peroxidation. In the cornea, this enzyme may help in the absorption of the damaging UV-B, as well as in the detoxification of the UV-induced peroxidic aldehydes.
Gene Name:
ALDH1B1
Uniprot ID:
P52476
Molecular weight:
56770.0
General function:
Energy production and conversion
Specific function:
Oxidizes medium and long chain saturated and unsaturated aldehydes. Metabolizes also benzaldehyde. Low activity towards acetaldehyde and 3,4-dihydroxyphenylacetaldehyde. May not metabolize short chain aldehydes. Can use both NADP(+) and NAD(+) as electron acceptor. May have a protective role against the cytotoxicity induced by lipid peroxidation.
Gene Name:
ALDH3B1
Uniprot ID:
Q1JPA0
Molecular weight:
51800.0
General function:
Energy production and conversion
Specific function:
Not Available
Gene Name:
ALDH2
Uniprot ID:
P20000
Molecular weight:
56653.0
General function:
Energy production and conversion
Specific function:
Catalyzes the oxidation of long-chain primary alcohols and the oxidation of S-(hydroxymethyl) glutathione. Also oxidizes long chain omega-hydroxy fatty acids, such as 20-HETE, producing both the intermediate aldehyde, 20-oxoarachidonate and the end product, a dicarboxylic acid, (5Z,8Z,11Z,14Z)-eicosatetraenedioate. Class-III ADH is remarkably ineffective in oxidizing ethanol.
Gene Name:
ADH5
Uniprot ID:
Q3ZC42
Molecular weight:
39677.0
General function:
Not Available
Specific function:
Not Available
Gene Name:
OTUB1
Uniprot ID:
Q3T0Y1
Molecular weight:
31308.0
General function:
Not Available
Specific function:
Not Available
Gene Name:
OTUB2
Uniprot ID:
Q5E9Y3
Molecular weight:
27248.0
General function:
Not Available
Specific function:
Not Available
Gene Name:
ACSS2
Uniprot ID:
A7YWF1
Molecular weight:
78734.0
Reactions
Acetoacetyl-CoA + Adenosine monophosphate + Pyrophosphate → Acetyl adenylate + Acetaldehyde + Adenosine triphosphatedetails