DL-Methionine

CAS No.: 59-51-8
Molecular formular: C₅H₁₁NO₂S
Molecular weight: 149.21

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Shijiazhuang Jirong Pharmaceutical Co., Ltd.

Address: No.8 North of Huagong Road, Circular Chemical Industry Zone, Shijiazhuang, Hebei, China

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DL-Methionine	AJI97	USP2025	EP11	JP18
Appearance	White crystals or crystalline powder	Almost white, crystalline powder or small flakes	Almost white, crystalline powder or small flakes	/
ldentification(IR)	Conform	Meets the requirements	IR: Conform to CRS Spectrum	/
ldentification(TLC)	/	Conform	/	/
ldentification	/	A deep red color develops	/	/
State of solution (Transmittance)	Clear and colorless, ≥98.0%	≥98.0%	/	/
Specific rotation	/	/	-0.05° ~ +0.05°	/
Optical rotation	/	-0.05° ~ +0.05°	/
Chloride	≤0.020%	≤200ppm	≤200ppm	/
Sulfate	≤0.020%	≤200ppm	≤200ppm	/
Ammonium	≤0.02%	≤200ppm	/	/
Iron	≤10ppm	≤10ppm	/	/
Heavy metals	≤10ppm	/	/	/
Arsenic	≤1ppm	/	/	/
Other amino acids	Conform	/	/	/
Loss on drying	≤0.30%	≤0.5%	≤0.5%	/
Residue on ignition	≤0.10%	≤0.1%	≤0.1%	/
pH	5.6 ~ 6.1	5.4 ~ 6.1	5.4 ~ 6.1	/
Assay	99.0% ~ 101.0%	99.0% ~ 101.0% (on the dried basis)	99.0% ~ 101.0% (dried substance)	/
Appearance of solution	/	/	Solution S is clear and colourless	/
Related substances	/	≤0.2%	≤ 0.2%	/