CAS No.:63-68-3
L-Methionine
Molecular Formula: C5H11NO2S
Molecular Weight: 149.21
CAS Number: 63-68-3
Specifications
| L-methionine | CP2020 | EP11 | USP2023 | USP40 | AJI92 |
| content | ≥98.5% | 99.0-101.0% | 98.5-101.5% | 98.5-101.5% | 99.0-100.5% |
| acidity | 5.6-6.1 | 5.5-6.5 | 5.6-6.1 | 5.6-6.1 | 5.6-6.1 |
| Specific rotation [a]D20 | +21.0°-+25.0° | +22.5°-+24.0° | / | / | +23.0°-+24.5° |
| Specific rotation [a]D25 | / | / | +22.4°-+24.7° | +22.4°-+24.7° | / |
| Light | ≥98.0% | / | / | / | ≥98.0% |
| Solution appearance | / | clear & colorless | / | / | / |
| chloride | ≤0.02% | ≤0.02% | ≤0.05% | ≤0.03% | ≤0.02% |
| Ammonium salt | ≤0.02% | ≤0.02% | / | ≤0.02% | |
| sulfate | ≤0.02% | ≤0.03% | ≤0.03% | ≤0.03% | ≤0.02% |
| Iron salts | ≤15PPM | ≤10PPM | ≤30PPM | ≤30PPM | ≤10PPM |
| heavy metal | ≤10PPM | / | / | ≤15PPM | ≤10PPM |
| Arsenic salts | ≤1PPM | / | / | / | ≤1PPM |
| Other amino acids | ≤0.5% | Each impurity≤ 0.1% Total impurities≤ 0.3% | Methionine sulfoxide≤0.1% N-Acetyl-D,L-methionine≤0.2% Any unspecified impurity≤0.1% Total unspecified impurities≤0.3% | Individual impurities≤0.5% Total impurities≤2.0% | conforms |
| Ninhydrin active substance | / | / | / | / | / |
| Loss on drying | ≤0.2% | ≤0.50% | ≤0.3% | ≤0.3% | ≤0.20% |
| Residue of ignition | ≤0.1% | ≤0.10% | ≤0.4 | ≤0.4 | ≤0.10% |
| Total bacteria | ≤ 1000 CFU/g | ≤ 1000 CFU/g | ≤ 1000 CFU/g | ≤ 1000 CFU/g | ≤ 1000 CFU/g |
| Mold & yeast | ≤ 100 CFU/g | ≤ 100 CFU/g | ≤ 100 CFU/g | ≤ 100 CFU/g | ≤ 100 CFU/g |