Product Detail

L-Methionine	EP6	AJI92	USP40
Description	A white or almost white, crystalline powder or colourless crystals	White crystals or crystalline powder	/
Solubility	Soluble in water,very slightly soluble in alcohol	/	/
Identification test (A,B）	Conforms	Conforms	Conforms
Appearance of solution	Clarity of solution:2.5% water solution should be clear	/	/
Appearance of solution	Colour of solution:2.5% water solution should be colourless	/	/
Assay	99.0%-101.0%	98.5%～101.5%	98.5%～101.5%
pH	5.5～6.5	5.6~6.1	5.6~6.1
Transmittance	/	≥98.0%	/
Specific optical rotation	+22.5°～ +24.0°	+23.0° ～ +25.0°	+22.4º～+24.7º
Loss on drying	≤0.5%	≤0.20%	≤0.3%
Residue on ignition	≤0.1%	≤0.10%	≤0.4%
Ninhydrin-positive Substances (TLC)	Conforms	/	/
Bacterial endotoxin	＜25EU/g	/	/
Chloride	≤200ppm	≤0.020%	≤0.05%
Heavy Metals	≤10ppm	≤10ppm	≤0.0015%
Iron	≤10ppm	≤10ppm	≤0.003%
Sulfate	≤300ppm	≤0.020%	≤0.03%
Endotoxin	/	/	/
Arsenic	/	≤1ppm	/
Ammonium	≤200ppm	≤0.02%	/
Other amino acids	/	Conforms	Conforms
Pyrongen	/	Conforms	/
Hydrolyzable substances	/	/	/