CAS number: 63-68-3
Molecular formula: C5H11NO2S
molecular weight: 149.21
Chemical structure:
Product | L-Methionine | |
Shelf Life | 3 years | |
Reference standard | USP 32 | |
Item | Standard | Conclusion of analysis |
Description | white crystals or crystalline powder | white crystalline powder |
Identification | meets the requirements | meet the requirements |
Specific rotation | +22.4°~+24.7° | +23.9° |
pH | 5.6~6.1 | 5.8 |
Loss on drying | not more than 0.3% | 0.12% |
Residue on ignition | not more than 0.4% | 0.08% |
Chloride | not more than 0.05% | less than 0.05% |
Sulfate | not more than 0.03% | less than 0.03% |
Iron | not more than 0.003% | less than 0.003% |
Heavy metals | not more than 0.0015% | less than 0.0015% |
Chromatographic purity | individual impurity≤0.5% | meet the requirements |
Total impurities≤2.0% | meet the requirements | |
Organic volatile impurities | meet the requirements | meet the requirements |
Assay | 98.5%~101.5% |