Molecular Formula: C3H7NO2S·HCl·H2O
Molecular Weight: 175.64
CAS No： 7048-4-6
| L-Cysteine Hcl Monohydrate | CP2020 | EP11 | USP2023 | AJI92 |
| Assay | ≥98.5% | 98.5-101.0% | 98.5-101.5% | 99.0-100.5% |
| PH | 1.5-2.0 | / | / | 1.5-2.0 |
| Specific rotation[a]D20 | +5.5°-+7.0° | +5.5°-+7.0° | / | +5.5°-+7.0° |
| Specific rotation[a]D25 | / | / | +5.7°-+6.8° | / |
| Transmittance(T430) | ≥98.0% | / | / | ≥98.0% |
| Appearance of solution | / | clear & colorless ≤BY6 | / | / |
| Chloride(Cl) | 19.8-20.8% | / | / | 19.89-20.29% |
| Ammonium(NH4) | / | ≤0.02% | / | ≤0.02% |
| Sulfate(SO4) | ≤0.02% | ≤0.03% | ≤0.03% | ≤0.02% |
| Iron(Fe) | ≤10PPM | ≤20PPM | ≤30PPM | ≤10PPM |
| Heavy metals(Pb) | ≤10PPM | / | / | ≤10PPM |
| Arsenic | ≤1PPM | / | / | ≤1PPM |
| Other amino acids | ≤0.5% | / | Individual impurities≤0.5% Total impurities≤2.0% | Chromatographically not detectable. |
| 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% | 8.5-12.0% |
| Residue on ignition | ≤0.10% | ≤0.10% | ≤0.4% | ≤0.10% |
| Total plate count | ≤ 500 CFU/g | ≤ 500 CFU/g | ≤ 500 CFU/g | ≤ 500 CFU/g |
| Moulds & Yeasts | ≤ 50 CFU/g | ≤ 50 CFU/g | ≤ 50 CFU/g | ≤ 50 CFU/g |
| Pathogenic Bacterium | Cronobacter spp /Enterobacteriaceae /Salmonella /Bacillus cereus /Sulphite-reducing clostridia(SRC) （Can be tested upon request） | |||
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