DL-蛋氨酸

Description

DL-Methionine is identified by CAS 59-51-8, molecular formula C5H11NO2S and molecular weight 149.05 g/mol. UNII 73JWT2K6T3; ChEBI 16811; InChIKey FFEARJCKVFRZRR-UHFFFAOYSA-N. Boiling Point: 300.00 to 301.00 °C. @ 760.00 mm Hg; Melting Point: 281 °C; Solubility: 32.7 mg/mL at 25 °C.

Identification

CAS Registry Number	59-51-8
PubChem CID	876
Molecular formula	C5H11NO2S
Molecular weight	149.05 g/mol
IUPAC name	2-amino-4-methylsulfanylbutanoic acid
InChIKey	FFEARJCKVFRZRR-UHFFFAOYSA-N
UNII (FDA)	73JWT2K6T3
ChEBI ID	CHEBI:16811
FEMA number	3301
JECFA number	1424

Computed Descriptors

Molecular Weight	149.21
XLogP3	-1.9
Hydrogen Bond Donor Count	2
Hydrogen Bond Acceptor Count	4
Rotatable Bond Count	4
Exact Mass	149.05104977
Monoisotopic Mass	149.05104977
Topological Polar Surface Area	88.6
Heavy Atom Count	9
Formal Charge	0

Physical & Chemical Properties

Boiling Point	300.00 to 301.00 °C. @ 760.00 mm Hg
Melting Point	281 °C
Solubility	32.7 mg/mL at 25 °C
Decomposition	281 °C

Physical description & handling notes

• Solid; [Merck Index] Colorless or white solid; [ICSC] White powder; [Sigma-Aldrich MSDS]
• Solid
• COLOURLESS CRYSTALS OR WHITE POWDER.
• White crystalline platelets or powder; Characteristic aroma
• Solubility in water, g/100ml at 20 °C: 4.8
• Soluble in water; Insoluble in ether

Regulatory Status

Regulatory & Food Contact	EU Flavoring substances FDA Substance added to food: FLAVOR ENHANCER, FLAVORING AGENT OR ADJUVANT, NUTRIENT SUPPLEMENT Flavoring Agents FLAVOURING_AGENT: Flavouring Agent Savory No safety concern at current levels of intake when used as a flavouring agent
GHS notification summary	99% (197 / 199)

GHS Hazard Classification

GHS notification summary	99% (197 / 199)

Documented Uses

• An essential amino acid; Used therapeutically as an antidote for acetaminophen poisoning and a urinary acidifier; [Merck Index] Used as a flavoring agent and nutritional supplement; [FDA]
• EPA Safer Chemical Functional Use Classes -> Enzymes and Enzyme Stabilizers
• Safer Chemical Classes -> Green circle - The chemical has been verified to be of low concern
• Flavouring Agent -> FLAVOURING_AGENT -> JECFA Functional Classes
• Flavoring Agents -> JECFA Flavorings Index
• Cosmetics -> Antistatic; Skin conditioning; Hair conditioning

Synonyms

DL-METHIONINE; 59-51-8; Racemethionine; Acimetion; Lobamine; Urimeth; (+-)-Methionine; DL-Methioninum; Methionine, DL-; 2-amino-4-methylsulfanylbutanoic acid; 2-amino-4-(methylsulfanyl)butanoic acid; FEMA No. 3301; Methionine, amorphous; Methionine DL-; DL-2-Amino-4-(methylthio)-butyric acid; DTXSID9020821

Frequently Asked Questions

What are the CAS number and molecular formula of DL-Methionine?

CAS 59-51-8; molecular formula C5H11NO2S; molecular weight 149.05 g/mol.

What other names is DL-Methionine known by?

DL-METHIONINE, 59-51-8, Racemethionine, Acimetion, Lobamine, Urimeth.

What is the regulatory status of DL-Methionine?

Documented regulatory listings: EU Flavoring substances; FDA Substance added to food: FLAVOR ENHANCER, FLAVORING AGENT OR ADJUVANT, NUTRIENT SUPPLEMENT; Flavoring Agents.

Is DL-Methionine classified as hazardous?

99% of GHS notifications report no hazard classification (197 of 199).

What are the key physical properties of DL-Methionine?

Boiling Point: 300.00 to 301.00 °C. @ 760.00 mm Hg; Melting Point: 281 °C; Solubility: 32.7 mg/mL at 25 °C; Decomposition: 281 °C.

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.