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L-Methionine (63-68-3) C5H11NO2S

  • Chemical Name: L-Methionine
  • CAS No.:63-68-3
  • MF: C5H11NO2S
  • MW: 149.21
  • Purity:>99% or As customer requested
  • Color: White
  • Product Categories: Nutritional Supplements; L-Amino Acids; Amino Acids; APIs; Organosulfur compounds
  • Test method: HPLC

What is Methionine?

Methionine is one of nine essential amino acids in humans (provided by food), Methionine is required for growth and tissue repair. A sulphur-containing amino acid, methionine improves the tone and pliability of skin, hair, and strengthens nails. Involved in many detoxifying processes, sulphur provided by methionine protects cells from pollutants, slows cell aging, and is essential for absorption and bio-availability of selenium and zinc. Methionine chelates heavy metals, such as lead and mercury, aiding their excretion. It also acts as a lipotropic agent and prevents excess fat buildup in the liver. 

L-methionine is the L-enantiomer of methionine. It has a role as a nutraceutical, a micronutrient, an antidote to paracetamol poisoning, a human metabolite and a mouse metabolite. It is an aspartate family amino acid, a proteinogenic amino acid, a methionine and a L-alpha-amino acid. It is a conjugate base of a L-methioninium. It is a conjugate acid of a L-methioninate. It is an enantiomer of a D-methionine. It is a tautomer of a L-methionine zwitterion.

Basic information  
Product Name: L-Methionine
Synonyms: L-Met-OH;L-Methionine, Animal-Free;L-METHIONINE (13C5,D8,15N);L-METHIONINE (1,2,3,4-13C4;METHYL-13CH3);L-METHIONINE, REAGENT GRADE, >=98% (;L-MethionineUSP, 98.5-101.5% (Titration: anhydrous basis);L(-)-Methionin
CAS: 63-68-3
MW: 149.21
EINECS: 200-562-9
Product Categories: Nutritional Supplements; L-Amino Acids; Amino Acids; APIs; Organosulfur compounds
Chemical Structure


Chemical Properties   
Melting point  284 °C (dec.)(lit.)
alpha  23.25 º (c=2, 6N HCl)
Boiling point  393.91°C (estimate)
density  1,34g/cm
refractive index  1.5216 (estimate)
storage temp.  20-25°C
solubility  1 M HCl: 0.5 M at 20 °C, clear, colorless
form  Solid
pka 2.13(at 25℃)
color  White
PH 5-7 (10g/l, H2O, 20℃)
optical activity [α]20/D +23.7±0.5°, c = 5% in 5 M HCl
Water Solubility  Soluble
λmax λ: 260 nm Amax: 0.40
λ: 280 nm Amax: 0.05
Merck  14,5975
BRN  1722294
Stability: Stable. Incompatible with strong oxidizing agents.
Usage And Synthesis   
Chemical Properties White crystalline powder

Essential aminoacid for human development. Hepatoprotectant; antidote (acetominophen poisoning); urinary acidifier.
methionine is slows down and normalizes oil gland sebum production. Methionine is also used as a texturizer in cosmetic creams. It is an essential amino acid found in a number of proteins and obtained by means of fermentation.
Therapeutic Function Lipotropic
Technical Support & Resources
Information provided in the product description is from published literature. Due to the nature of scientific experimentation, your results or specific application for this product may differ. If you have questions about how this product fits your application, please contact our technical support staff.

MSDS: MSDS available.

COA: COA can be available if you send us inquiry.

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