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L-Methionine

Product Name: L-Methionine
Molecular Formula: C5H11NO2S 
Molecular Weight: 149.21
CAS No: 63-68-3

Product Specifications


L-Methionine USP36   AJI92 EP6
Assay 98.5-101.5% 99.0-100.5% 99.0-101.0%
PH 5.6-6.1 5.6-6.1 5.5-6.5
Specific rotation[a]D20 / +23.0°-+24.5° +22.5°-+24.0°
Specific rotation[a]D25 +22.4°-+24.7° / /
Transmittance(T430) / ≥98.0% clear & colorless
Chloride(Cl) ≤0.05% ≤0.02% ≤0.02%
Ammonium(NH4) / ≤0.02% ≤0.02%
Sulfate(SO4) ≤0.03% ≤0.02% ≤0.03%
Iron(Fe) ≤30PPM ≤10PPM ≤10PPM
Heavy metals(Pb) ≤15PPM ≤10PPM ≤10PPM
Arsenic / ≤1PPM /
Other amino acids individual impurities≤0.5% total impurities≤2.0% conforms /
Ninhydrin-positive substances / / conform
Loss on drying ≤0.3% ≤0.20% ≤0.50%
Residue on ignition ≤0.4 ≤0.10% ≤0.10%


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