L-Methionine CAS 63-68-3, L-Methionine, CAS 63-68-3
Molecular formula: C₅H₁₁NO₂S,Molecular weight: 149.21,Appearance: White thin flaky crystals or powder, hygroscopic, slightly bitter and with a special odor.
63-68-3
C5H11NO2S
149.21
200-562-9
| CAS | 63-68-3 |
| Molecular formula | C5H11NO2S |
| Molecular weight | 149.21 |
| EIENCS | 200-562-9 |
| Form | Solid |
| Melting point | 284°C |
| boling point | 393.91°C |
| Density | 1,34g/cm |
| Solubility | 1 M HCl: 0.5 M at 20 °C, clear, colorless |
| PKA | 2.13(at 25℃) |
| Color | White |
| Storage temp | 20-25°C |
Molecules and Structures
Molecular formula: C₅H₁₁NO₂S
Molecular weight: 149.21
Appearance: White thin flaky crystals or powder, hygroscopic, slightly bitter and with a special odor.
Melting and boiling points: Melting point 280-284°C (decomposes), boiling point not specified (decomposes easily at high temperatures).
Solubility
Readily soluble in water (5.6g /100mL, 30℃), dilute acids and dilute alkalis;
It is insoluble in ethanol and almost insoluble in ether.
Stability
It is stable to heat and air, but is prone to demethylation and degradation in a strong acidic environment.
Unstable in strong alkali, it decomposes more rapidly at high temperatures.
Key parameters
pH value: The pH of 1% aqueous solution is 5.6-6.1.
Specific rotation: +23.25° (c= 2,6 N HCl)
Impurity limits: Heavy metal (Pb) ≤0.001%, arsenic ≤0.0001%, iron ≤0.001%.
Food industry
Nutritional supplements: Added to dairy products, baked goods (bread/cake), and condiments to enhance protein utilization (limited to 150-400mg /100g infant formula powder);
Flavor improvement: Enhance the sweetness of artificial sweeteners and improve the aftertaste (addition amount 1-10%).
Medicine and Health
Essential amino acid supplementation: Used for amino acid infusion and adjuvant treatment of liver diseases (such as fatty liver and liver cirrhosis);
Metabolic function: Participates in methylation reactions to generate antioxidant substances such as cysteine and glutathione.
Feed and Agriculture
Animal feed additives: Make up for the gap of limiting amino acids in plant protein and promote growth (aquatic/livestock feed).
Industry and daily chemicals
Cosmetics: Used as a moisturizing and repairing ingredient in shampoos and facial masks;
Tobacco: As a substitute for glycerin as a flavoring and moisture-retaining agent for tobacco shreds.
Toxicity data
Acute toxicity: Intraperitoneal injection of LD₅₀=29 mmol/kg (approximately 4.3 g/kg) in rats;
Health risks: Excessive intake may cause vomiting and liver damage; Long-term exposure may cause kidney enlargement.
Operation protection
Essential equipment: Dust mask, chemical goggles, nitrile gloves (to prevent skin irritation);
Storage requirements: Keep sealed, away from light, in a cool and dry place (humidity ≤60%), and keep away from strong acids/oxidants.
Environment and Emissions
Cyanide-containing process wastewater needs to be treated by oxidation to break down cyanide (the production involves sodium cyanide)
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