Pharmaceutical Materials

DL-Methionine (CAS No.: 59-51-8), chemically known as DL-2-Amino-4-(methylthio)butyric acid, is an essential sulfur-containing amino acid with a molecular formula of C₅H₁₁NO₂S and a molecular weight of 149.21 g/mol. It is a white crystalline powder with a characteristic sulfur-like odor, soluble in water and dilute acids but insoluble in ether. DL-Methionine plays a crucial role in protein synthesis and metabolism, serving as a precursor for cysteine and glutathione. It is widely used in animal feed as a nutritional supplement to enhance growth and prevent deficiencies, particularly in poultry and livestock. Additionally, DL-Methionine is employed in pharmaceuticals for treating liver disorders and as a dietary supplement to support hair, skin, and nail health. Its stability and compatibility with various formulations make it a versatile ingredient in food, feed, and pharmaceutical industries.

Usage： As feed nutrition enhancer；Used as a biochemical reagent.

Packaging and Shipping： 25KG/drum or according to buyer’s requirements.

Storage: Stored in a dry and ventilated warehouse; keep away from sunshine; avoid fire; avoid moisture.

Name	DL-Methionine
Synonyms	Neston Metione Urimeth Pedameth Petameth Thiomedon H-DL-Met-OH DL-Methionine DL-Methoionine (RS)-2-Amino-3-methylthiobutansαure DL-2-Amino-4-(methylthio)butyric acid (R,S)-2-Amino-4-methylsulfanyl-butyricacid
CAS	59-51-8
EINECS	200-432-1
InChI	InChI=1/C5H11NO2S/c1-9-3-2-4(6)5(7)8/h4H,2-3,6H2,1H3,(H,7,8)
InChIKey	FFEARJCKVFRZRR-UHFFFAOYSA-N

Molecular Formula	C5H11NO2S
Molar Mass	149.21
Density	1.34
Melting Point	284°C (dec.)(lit.)
Boling Point	306.9±37.0 °C(Predicted)
Specific Rotation(α)	-1～+1°(D/20℃)(c=8,HCl)
JECFA Number	1424
Water Solubility	2.9 g/100 mL (20 ºC)
Solubility	Soluble in water, dilute acid and dilute alkali, slightly soluble in 95% alcohol, insoluble in ether
Appearance	Crystalline powder
Color	White
Merck	14,5975
BRN	636185
pKa	2.13(at 25℃)
Storage Condition	2-8°C
Stability	Stable. Incompatible with strong oxidising agents.
Sensitive	Sensitive to light
Refractive Index	1.5216 (estimate)
MDL	MFCD00063096
Physical and Chemical Properties	White flaky crystal or crystalline powder. Special odor. The taste was slightly sweet. Melting point 281 degrees (decomposition). 10% pH of the aqueous solution 5.6-6.1. No optical rotation. Stable to heat and air. Unstable to strong acids, can lead to demethylation. Soluble in water (3.3g/100ml,25 degrees), dilute acid and dilute solution. Extremely insoluble in ethanol, almost insoluble in ether
Use	Used as a Biochemical reagent

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