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CAS 59-51-8

CAS 59-51-8 matches 0 EU annex records across Annex II–VI of Regulation 1223/2009.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 59-51-8
CAS 59-51-8PubChem CID 876

(+-)-Methionine

Methionine is a sulfur-containing amino acid that is butyric acid bearing an amino substituent at position 2 and a methylthio substituent at position 4. It has a role as a Saccharomyces cerevisiae metabolite, a plant metabolite, an Escherichia coli metabolite, a Daphnia magna metabolite and an algal metabolite. It is a sulfur-containing amino acid and an alpha-amino acid. It is functionally related to a butyric acid. It is a conjugate base of a methioninium. It is a conjugate acid of a methioninate. It is a tautomer of a methionine zwitterion. — ChEBI

IUPAC name
2-amino-4-methylsulfanylbutanoic acid
Molecular formula
C5H11NO2S
Molecular weight
149.21 g/mol
Exact mass
149.05104977 Da
XLogP3
-1.9
Topological polar surface area
88.6 Ų
Hydrogen-bond donors
2
Hydrogen-bond acceptors
4
Covalent units
1
Defined stereocentres
0

Also known as

DL-METHIONINERacemethionineAcimetionLobamineUrimethDL-MethioninumMethionine, DL-2-amino-4-(methylsulfanyl)butanoic acid
16 more reported names
FEMA No. 3301Methionine, amorphousMethionine DL-DL-2-Amino-4-(methylthio)-butyric acidNSC-924173JWT2K6T3CHEBI:168112-azaniumyl-4-methylsulfanylbutanoateMethionine, DLDL-Isomer MethionineRefChem:562822-amino-4-methylsulfanylbutanoate;hydron200-432-1MertioninPedamethD,L-methionine
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External database identifiers

Retrieved from NIH PubChem on 2026-08-31 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Records for CAS 59-51-8

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How CAS 59-51-8 is used on this site

CAS 59-51-8 is the Chemical Abstracts Service identifier used to pin this page to a specific substance. In the current dataset, 0 EU annex records share this identifier, which helps you cross-check whether the same substance appears under one regulatory context or several.

Use this page when a supplier specification, SDS or raw-material dossier gives you CAS 59-51-8 and you need to see every linked Annex II–VI record in one place. The entry cards above are the quickest route to concentration limits, warnings, annex placement and product-type conditions.