Record Information
Version1.0
Creation date2010-04-08 22:09:53 UTC
Update date2020-09-17 15:35:31 UTC
Primary IDFDB011886
Secondary Accession NumbersNot Available
Chemical Information
FooDB NameMethanethiol
DescriptionMethyl mercaptan also known as Methanethiol, belongs to the class of organic compounds known as alkylthiols. These are organic compounds containing the thiol functional group linked to an alkyl chain. The chemical formula for methanethiol is CH3SH. Methyl Mercaptan is a very weakly acidic compound (based on its pKa). Methanethiol is a colorless gas that smells like rotten cabbage. It is a natural substance found in the blood, brain, and other tissues of humans and other animals. It is also one of the main chemicals responsible for bad breath and flatulence in humans. At very high concentrations methanethiol is highly toxic and affects the central nervous system. Methanethiol is a by-product produced by the metabolism of asparagus in 40-50% of people. The ability to detect the presence of methanethiol is also a genetic trait. Methyl mercaptan is responsible for a noticeable change in the odor of urine, as soon as a few hours after eating asparagus. Its acidity makes it reactive with dissolved metals in aqueous solutions. The environmental chemistry of these interactions in seawater or freshwater environments such as lakes has yet to be fully investigated. It has been isolated from higher plants, such as radish (Raphanus sativus). It is also present in orange juice, pineapple, strawberries, asparagus, wheat bread, gruyere cheese, hop oil, coffee, roasted filberts, cooked rice and other foods.
CAS Number74-93-1
Structure
Thumb
Synonyms
SynonymSource
MethylmercaptanChEBI
CH3SHHMDB
Mercaptan methyliqueHMDB
MercaptomethaneHMDB
MethanethioleHMDB
MethanthiolHMDB
MethvtioloHMDB
Methyl mercaptanHMDB
Methyl sulfhydrateHMDB
Methyl thioalcoholHMDB
MethylmercaptaanHMDB
MetilmercaptanoHMDB
ThiomethaneHMDB
ThiomethanolHMDB
Methylmercaptan, lead (2+) saltMeSH, HMDB
MethanethiolateMeSH, HMDB
Methylmercaptan, sodium saltMeSH, HMDB
Methylmercaptan, mercury (2+) saltMeSH, HMDB
ATObiospider
FEMA 2716db_source
MEEbiospider
Mercaptan C1biospider
Methaanthiolbiospider
Methyl mercaptan [UN1064] [Poison gas]biospider
Methyl-mercaptanbiospider
Methylsulfaniumbiospider
Methylsulfide anionbiospider
Methylthioalcoholbiospider
Thiomethyl alcoholbiospider
Predicted Properties
PropertyValueSource
Water Solubility20 g/LALOGPS
logP0.73ALOGPS
logP0.84ChemAxon
logS-0.38ALOGPS
pKa (Strongest Acidic)10.34ChemAxon
Physiological Charge0ChemAxon
Hydrogen Acceptor Count0ChemAxon
Hydrogen Donor Count1ChemAxon
Polar Surface Area0 ŲChemAxon
Rotatable Bond Count0ChemAxon
Refractivity14.24 m³·mol⁻¹ChemAxon
Polarizability5.33 ųChemAxon
Number of Rings0ChemAxon
BioavailabilityYesChemAxon
Rule of FiveYesChemAxon
Ghose FilterNoChemAxon
Veber's RuleYesChemAxon
MDDR-like RuleNoChemAxon
Chemical FormulaCH4S
IUPAC namemethanethiol
InChI IdentifierInChI=1S/CH4S/c1-2/h2H,1H3
InChI KeyLSDPWZHWYPCBBB-UHFFFAOYSA-N
Isomeric SMILESCS
Average Molecular Weight48.107
Monoisotopic Molecular Weight48.003370818
Classification
Description Belongs to the class of organic compounds known as alkylthiols. These are organic compounds containing the thiol functional group linked to an alkyl chain.
KingdomOrganic compounds
Super ClassOrganosulfur compounds
ClassThiols
Sub ClassAlkylthiols
Direct ParentAlkylthiols
Alternative Parents
Substituents
  • Alkylthiol
  • Hydrocarbon derivative
  • Aliphatic acyclic compound
Molecular FrameworkAliphatic acyclic compounds
External Descriptors
Ontology
Physiological effect

Health effect:

Disposition

Route of exposure:

Source:

Biological location:

Role

Biological role:

Physico-Chemical Properties - Experimental
Physico-Chemical Properties - Experimental
PropertyValueReference
Physical stateGas
Physical DescriptionNot Available
Mass CompositionC 24.97%; H 8.38%; S 66.65%DFC
Melting PointMp -123°DFC
Boiling PointBp 5.95°DFC
Experimental Water Solubility15.4 mg/mL at 25 oCHINE,J & MOOKERJEE,PK (1975)
Experimental logPNot Available
Experimental pKapKa 10.33 (25°)DFC
Isoelectric pointNot Available
ChargeNot Available
Optical RotationNot Available
Spectroscopic UV DataNot Available
Densityd204 0.87DFC
Refractive IndexNot Available
Spectra
Spectra
EI-MS/GC-MS
TypeDescriptionSplash KeyView
EI-MSMass Spectrum (Electron Ionization)splash10-0002-9000000000-53d9f1ccbdb100d7320dSpectrum
Predicted GC-MSMethanethiol, non-derivatized, Predicted GC-MS Spectrum - 70eV, Positivesplash10-0002-9000000000-8d72d46dca582778b7e5Spectrum
Predicted GC-MSMethanethiol, non-derivatized, Predicted GC-MS Spectrum - 70eV, PositiveNot AvailableSpectrum
MS/MS
TypeDescriptionSplash KeyView
MS/MSLC-MS/MS Spectrum - QqQ 7V, positivesplash10-0002-9000000000-d9ea435a547323998051Spectrum
Predicted MS/MSPredicted LC-MS/MS Spectrum - 10V, Positivesplash10-0002-9000000000-d6688241d1bd9d04eb37Spectrum
Predicted MS/MSPredicted LC-MS/MS Spectrum - 20V, Positivesplash10-0002-9000000000-d6688241d1bd9d04eb37Spectrum
Predicted MS/MSPredicted LC-MS/MS Spectrum - 40V, Positivesplash10-0002-9000000000-d6688241d1bd9d04eb37Spectrum
Predicted MS/MSPredicted LC-MS/MS Spectrum - 10V, Negativesplash10-0002-9000000000-56912dcbda83e96bbb38Spectrum
Predicted MS/MSPredicted LC-MS/MS Spectrum - 20V, Negativesplash10-0002-9000000000-56912dcbda83e96bbb38Spectrum
Predicted MS/MSPredicted LC-MS/MS Spectrum - 40V, Negativesplash10-0002-9000000000-56912dcbda83e96bbb38Spectrum
Predicted MS/MSPredicted LC-MS/MS Spectrum - 10V, Negativesplash10-0002-9000000000-e1d92d2a30bee517d754Spectrum
Predicted MS/MSPredicted LC-MS/MS Spectrum - 20V, Negativesplash10-0002-9000000000-e1d92d2a30bee517d754Spectrum
Predicted MS/MSPredicted LC-MS/MS Spectrum - 40V, Negativesplash10-0002-9000000000-e1d92d2a30bee517d754Spectrum
Predicted MS/MSPredicted LC-MS/MS Spectrum - 10V, Positivesplash10-0002-9000000000-ff79e6fa0d49e599887cSpectrum
Predicted MS/MSPredicted LC-MS/MS Spectrum - 20V, Positivesplash10-0002-9000000000-ff79e6fa0d49e599887cSpectrum
Predicted MS/MSPredicted LC-MS/MS Spectrum - 40V, Positivesplash10-0002-9000000000-ff79e6fa0d49e599887cSpectrum
NMR
TypeDescriptionView
1D NMR1H NMR SpectrumSpectrum
1D NMR1H NMR SpectrumSpectrum
1D NMR13C NMR SpectrumSpectrum
1D NMR1H NMR SpectrumSpectrum
1D NMR13C NMR SpectrumSpectrum
1D NMR1H NMR SpectrumSpectrum
1D NMR13C NMR SpectrumSpectrum
1D NMR1H NMR SpectrumSpectrum
1D NMR13C NMR SpectrumSpectrum
1D NMR1H NMR SpectrumSpectrum
1D NMR13C NMR SpectrumSpectrum
1D NMR1H NMR SpectrumSpectrum
1D NMR13C NMR SpectrumSpectrum
1D NMR1H NMR SpectrumSpectrum
1D NMR13C NMR SpectrumSpectrum
1D NMR1H NMR SpectrumSpectrum
1D NMR13C NMR SpectrumSpectrum
1D NMR1H NMR SpectrumSpectrum
1D NMR13C NMR SpectrumSpectrum
1D NMR1H NMR SpectrumSpectrum
1D NMR13C NMR SpectrumSpectrum
ChemSpider ID855
ChEMBL IDNot Available
KEGG Compound IDC00409
Pubchem Compound ID878
Pubchem Substance IDNot Available
ChEBI ID16007
Phenol-Explorer IDNot Available
DrugBank IDNot Available
HMDB IDHMDB03227
CRC / DFC (Dictionary of Food Compounds) IDHBN72-N:HBN72-N
EAFUS ID2385
Dr. Duke IDMETHYL-MERCAPTAN|METHANETHIOL
BIGG IDNot Available
KNApSAcK IDC00001258
HET IDMEE
Food Biomarker OntologyNot Available
VMH IDNot Available
Flavornet ID74-93-1
GoodScent IDrw1008781
SuperScent IDNot Available
Wikipedia IDMethanethiol
Phenol-Explorer Metabolite IDNot Available
Duplicate IDSNot Available
Old DFC IDSNot Available
Associated Foods
FoodContent Range AverageReference
FoodReference
Biological Effects and Interactions
Health Effects / BioactivitiesNot Available
EnzymesNot Available
PathwaysNot Available
MetabolismNot Available
BiosynthesisNot Available
Organoleptic Properties
Flavours
FlavorCitations
sulfur
  1. Arn, H, Acree TE. “Flavornet: A database of aroma compounds based on odor potency in natural products”. Developments in Food Science 40 (1998): 27. doi:10.1016/S0167-4501(98)80029-0
gasoline
  1. Arn, H, Acree TE. “Flavornet: A database of aroma compounds based on odor potency in natural products”. Developments in Food Science 40 (1998): 27. doi:10.1016/S0167-4501(98)80029-0
garlic
  1. Arn, H, Acree TE. “Flavornet: A database of aroma compounds based on odor potency in natural products”. Developments in Food Science 40 (1998): 27. doi:10.1016/S0167-4501(98)80029-0
  2. The Good Scents Company (2009). Flavor and fragrance information catalog. <http://www.thegoodscentscompany.com/allprod.html> Accessed 15.10.23.
decomposing cabbage
  1. The Good Scents Company (2009). Flavor and fragrance information catalog. <http://www.thegoodscentscompany.com/allprod.html> Accessed 15.10.23.
Files
MSDSshow
References
Synthesis ReferenceNot Available
General ReferenceNot Available
Content Reference— Duke, James. 'Dr. Duke's Phytochemical and Ethnobotanical Databases. United States Department of Agriculture.' Agricultural Research Service, Accessed April 27 (2004).
— Shinbo, Y., et al. 'KNApSAcK: a comprehensive species-metabolite relationship database.' Plant Metabolomics. Springer Berlin Heidelberg, 2006. 165-181.