Molecular Formula: C6H9N3O2
Molecular Weight: 155.16
CAS No： 71-00-1
| L-Histidine | CP2020 | EP11 | USP2023 | USP32 | AJI92 |
| Assay | ≥ 99.0% | 98.5-101.0% | 98.5-101.5% | 98.5-101.5% | 99.0-101.0% |
| PH | 7.0-8.5 | / | 7.0-8.5 | 7.0-8.5 | 7.0-8.5 |
| Specific rotation[a]D20 | +12.0°-+12.8° | +11.4°-+12.4° | / | / | +12.0°-+12.8° |
| Specific rotation[a]D25 | / | / | +12.6°-+14.0° | +12.6°-+14.0° | |
| Transmittance(T430) | ≥ 98.0% | / | / | / | clear & colorless ≥ 98.0% |
| Appearance of solution | / | clear & colorless ≤BY7 | / | / | / |
| Chloride(Cl) | ≤0.02% | ≤0.02% | ≤0.05% | ≤0.05% | ≤0.02% |
| Ammonium(NH4) | ≤0.02% | ≤0.02% | / | / | ≤0.02% |
| Sulfate(SO4) | ≤0.02% | ≤0.03% | ≤0.03% | ≤0.03% | ≤0.02% |
| Iron(Fe) | ≤10PPM | ≤10PPM | ≤30PPM | ≤30PPM | ≤10PPM |
| Heavy metals(Pb) | ≤10PPM | / | / | ≤15PPM | ≤10PPM |
| Arsenic | ≤1PPM | / | / | / | ≤1PPM |
| Other amino acids | ≤0.5% | / | Individual impurities≤0.5% Total impurities≤2.0% | Individual impurities≤0.5% Total impurities≤2.0% | conforms |
| Ninhydrin-positive substances | / | Each impurities≤ 0.2% Total impurities≤ 0.5% | / | / | |
| Loss on drying | ≤0.20% | ≤0.50% | ≤0.20% | ≤0.20% | ≤0.20% |
| Residue on ignition | ≤0.10% | ≤0.10% | ≤0.40% | ≤0.40% | ≤0.10% |
| Total plate count | ≤ 1000 CFU/g | ≤ 1000 CFU/g | ≤ 1000 CFU/g | ≤ 1000 CFU/g | ≤ 1000 CFU/g |
| Moulds & Yeasts | ≤ 100 CFU/g | ≤ 100 CFU/g | ≤ 100 CFU/g | ≤ 100 CFU/g | ≤ 100 CFU/g |
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