Molecular Formula: C3H7NO2S.HCl.H2O
Molecular Weight: 175.64
CAS No： 7048-04-6
| L-Cysteine Hcl Monohydrate | CP2020 | EP11 | USP2023 |
| Assay | ≥98.5% | 98.5-101.0% | 98.5-101.5% |
| PH | 1.5-2.0 | / | / |
| Specific rotation[a]D20 | +5.5°-+7.0° | +5.5°-+7.0° | / |
| Specific rotation[a]D25 | / | / | +5.7°-+6.8° |
| Transmittance(T430) | ≥98.0% | / | / |
| Appearance of solution | / | clear & colorless ≤BY6 | / |
| Chloride(Cl) | 19.8-20.8% | / | / |
| Ammonium(NH4) | / | ≤0.02% | / |
| Sulfate(SO4) | ≤0.02% | ≤0.03% | ≤0.03% |
| Iron(Fe) | ≤10PPM | ≤20PPM | ≤30PPM |
| Heavy metals(Pb) | ≤10PPM | / | / |
| Arsenic | ≤1PPM | / | / |
| Other amino acids | ≤0.5% | / | individual impurities≤0.5% total impurities≤2.0% |
| Ninhydrin-positive substances | / | Each impurity≤ 0.2% Total impurity≤ 1.0% | / |
| Loss on drying | 8.0-12.0% | 8.0-12.0% | 8.0-12.0% |
| Residue on ignition | ≤0.10% | ≤0.10% | ≤0.4% |
| Endotoxin | conform | conform | conform |
| Total plate count | ≤ 500 CFU/g | ≤ 500 CFU/g | ≤ 500 CFU/g |
| Moulds & Yeasts | ≤ 50 CFU/g | ≤ 50 CFU/g | ≤ 50 CFU/g |
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