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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