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Cas Database |
| Name |
DL-Methionine |
EINECS | 200-432-1 |
| CAS No. | 59-51-8 | Density | 1.206 g/cm3 |
| PSA | 88.62000 | LogP | 0.85170 |
| Solubility | 2.9 g/100 mL (20 °C) in water | Melting Point |
284 °C (dec.)(lit.) |
| Formula | C5H11NO2S | Boiling Point | 306.9 °C at 760 mmHg |
| Molecular Weight | 149.214 | Flash Point | 139.4 °C |
| Transport Information | N/A | Appearance | white crystalline powder with a faint odor |
| Safety | 24/25-36-26 | Risk Codes | 33-36/37/38 |
| Molecular Structure |
|
Hazard Symbols |
 Xi
|
| Synonyms |
Methilonin;Methionine, amorphous;Methionine, DL-;Hmet;Meonine;DL-Methioninum;Pedameth;2-amino-4-(methylsulfanyl)butanoic acid;(2S)-2-azaniumyl-4-methylsulfanyl-butanoate;(2R)-2-azaniumyl-4-methylsulfanyl-butanoate;Urimeth;Metione;2-amino-4-(methylthio)butanoic acid;Cynaron;Dyprin;Lobamine;(+-)-Methionine;Racemethionine [USAN];Neston;alpha-Amino-gamma-(methylthio)butyric acid;DL-2-Amino-4-(methylthio)-butyric acid;Acimetion;Banthionine;alpha-amino-gamma-methylmercaptobutyric acid;DL-2-Amino-4-(methylthio)butanoic acid;DL-2-Amino-4-methylthiobutyric acid;H-DL-Met-OH;Racemethionine; |
Article Data | 112 |
DL-Methionine Synthetic route
- 17773-41-0
2-hydroxy-4-(methylthio)butyronitrile
- 59-51-8
DL-methionine
| Conditions | Yield |
|---|---|
| Stage #1: 2-hydroxy-4-(methylthio)butyronitrile With ammonia In water at 50℃; for 0.5h; Sealed tube; Stage #2: With cerium(IV) oxide In water at 75℃; for 2h; Reagent/catalyst; Temperature; Sealed tube; | 100% |
| Multi-step reaction with 2 steps 1: NH3 / unter Druck 2: aqueous H2SO4 View Scheme | |
| Multi-step reaction with 2 steps 1: ethanol; NH3 / 80 °C 2: aqueous H2SO4 View Scheme |
- 59-51-8
DL-methionine
| Conditions | Yield |
|---|---|
| 100% |
- 19298-72-7
DL-methionine amide
- 59-51-8
DL-methionine
| Conditions | Yield |
|---|---|
| With zirconium containing nickel oxide In water at 130℃; for 1h; Reagent/catalyst; Temperature; | 100% |
| With water; potassium hydroxide at 120℃; for 0.5h; Catalytic behavior; Reagent/catalyst; Temperature; Autoclave; | 100 %Chromat. |
- 13253-44-6
5-[2-(methylthio)ethyl]imidazolidine-2,4-dione
- 59-51-8
DL-methionine
| Conditions | Yield |
|---|---|
| Stage #1: 5-[2-(methylthio)ethyl]imidazolidine-2,4-dione With water; potassium carbonate at 120 - 160℃; Sonication; Stage #2: at 80 - 120℃; Reagent/catalyst; Sonication; | 99.9% |
| Stage #1: 5-[2-(methylthio)ethyl]imidazolidine-2,4-dione With water; potassium hydroxide at 173 - 178℃; for 1h; Stage #2: With carbon dioxide; water at 20℃; Crystallization; Presence of polyvinyl alcohol; | 97% |
| With water; potassium hydroxide at 120 - 173℃; pH=10.5; | 53.6% |
| Conditions | Yield |
|---|---|
| With cerium(IV) oxide; water at 75℃; for 2h; Concentration; Reagent/catalyst; | 97% |
| With ammonium hydroxide In water at 200℃; under 7500.75 Torr; for 20h; Pressure; Temperature; Inert atmosphere; Autoclave; | 88.1% |
| Stage #1: α-amino-γ-methylmercapto-butyronitrile With ammonia; tetra(n-butyl)ammonium hydrogensulfate; calcium oxide In water at 180 - 190℃; under 18751.9 - 22502.3 Torr; for 5h; Stage #2: With carbon dioxide In water at 20℃; pH=8; Reagent/catalyst; | 79.4% |
- 59-51-8
DL-methionine
| Conditions | Yield |
|---|---|
| With carbon dioxide In water at 80 - 100℃; under 1500.15 Torr; for 0.5h; pH=6; Autoclave; | 97% |
DL-Methionine Chemical Properties
Molecular structure of Racemethionine (CAS NO.59-51-8) is:
Product Name: Racemethionine
CAS Registry Number: 59-51-8
IUPAC Name: 2-amino-4-methylsulfanylbutanoic acid
Molecular Weight: 149.21134 [g/mol]
Molecular Formula: C5H11NO2S
XLogP3: -1.9
H-Bond Donor: 2
H-Bond Acceptor: 3
EINECS: 200-432-1
Melting Point: 284 °C (dec.)(lit.)
Water Solubility: 2.9 g/100 mL (20 °C)
Stability: Stable. Incompatible with strong oxidising agents.
Surface Tension: 50.5 dyne/cm
Density: 1.206 g/cm3
Flash Point: 139.4 °C
Enthalpy of Vaporization: 60.21 kJ/mol
Boiling Point: 306.9 °C at 760 mmHg
Vapour Pressure: 0.00017 mmHg at 25°C
Product Categories: Amino Acids;Amino Acid Derivatives;Methionine [Met, M];Amino Acids
DL-Methionine Uses
Racemethionine (CAS NO.59-51-8) is one of the twenty common amino acids.
DL-Methionine Toxicity Data With Reference
| Organism | Test Type | Route | Reported Dose (Normalized Dose) | Effect | Source |
|---|---|---|---|---|---|
| mouse | LDLo | intraperitoneal | 1500mg/kg (1500mg/kg) | Yakuri to Chiryo. Pharmacology and Therapeutics. Vol. 5, Pg. 2041, 1977. | |
| mouse | LDLo | intravenous | 300mg/kg (300mg/kg) | Yakuri to Chiryo. Pharmacology and Therapeutics. Vol. 5, Pg. 2041, 1977. | |
| mouse | LDLo | oral | 4gm/kg (4000mg/kg) | Yakuri to Chiryo. Pharmacology and Therapeutics. Vol. 5, Pg. 2041, 1977. | |
| rat | LD | intravenous | > 400mg/kg (400mg/kg) | Yakuri to Chiryo. Pharmacology and Therapeutics. Vol. 5, Pg. 2041, 1977. | |
| rat | LD | oral | > 5gm/kg (5000mg/kg) | Yakuri to Chiryo. Pharmacology and Therapeutics. Vol. 5, Pg. 2041, 1977. | |
| rat | LDLo | intraperitoneal | 2gm/kg (2000mg/kg) | Yakuri to Chiryo. Pharmacology and Therapeutics. Vol. 5, Pg. 2041, 1977. |
DL-Methionine Safety Profile
Moderately toxic by ingestion and other routes. An experimental teratogen. Experimental reproductive effects. When heated to decomposition it emits toxic fumes of SOx and NOx.
Hazard Codes: 
Xi
Risk Statements: 33-36/37/38
R33:Danger of cumulative effects.
R36/37/38:Irritating to eyes, respiratory system and skin.
Safety Statements: 24/25-36-26
S24/25:Avoid contact with skin and eyes.
S36:Wear suitable protective clothing.
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.
WGK Germany: 2
RTECS: PD0457000
F: 10-23
DL-Methionine Specification
Racemethionine , its cas register number is 59-51-8. It also can be called (+-)-Methionine ; Acimetion ; Banthionine ; Cynaron ; DL-2-Amino-4-(methylthio)-butyric acid ; DL-Methioninum ; Dyprin ; Lobamine ; alpha-Amino-gamma-(methylthio)butyric acid ; alpha-Amino-gamma-methylmercaptobutyric acid ; alpha-Amino-gamma-methylmercaptobutyric acid (VAN) .It is a white crystalline powder with a faint odor.
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