• L-Methionine



【Properties】Colorless or white glossy flaky crystals or white crystalline powder, with a slightly special smell and slightly bitter taste.
【Appearance】White flake crystal or powder
【PH】5.95 (1% aqueous solution)
【Loss on drying】≤0.05%
【Heavy metal (calculated as Pb)】≤0.001%
【Scope of application】It is used for biochemical research and nutritional supplements, and can be used as food and feed additives.
【Storage】Store in a cool, dry, clean and shading environment. It is strictly forbidden to mix with toxic and harmful substances to avoid pollution.

Specification Standard Test results
Appearance White crystals or crystalline powder Conform
Specific optical rotation +23.0°~+24.5° Conform
State of solution ≧98% 98.5
Chloride(CL) ≦0.020% 0.00%
Ammonium ≦0.02% 0.01%
Sulphate(SO4) ≦0.02% 0.02%
Iron(Fe) ≦10ppm 2ppm
Heavy metals(Pb) ≦10ppm 1ppm
Arsenic salt Not more than 1ppm 0.1ppm
Organic volatile impurities Meets the requirements Conforms
Loss on drying ≦0.4% 0.15%
Residue on ignition ≦0.1% 0.07%
Assay 99.0%-100.5% 99.50%
pH 5.6-6.1 5.9
Conclusion: The above specifications meet the requirements of USP36