CAS No.:71-00-1
L-Histidine
Molecular Formula： C6H9N3O2
Molecular Weight: 155.16
CAS Number: 71-00-1
Specifications
| L-histidine | CP2020 | EP11 | USP2023 |
| content | ≥ 99.0% | 98.5-101.0% | 98.5-101.5% |
| acidity | 7.0-8.5 | / | 7.0-8.5 |
| Specific rotation [a]D20 | +12.0°-+12.8° | +11.4°-+12.4° | / |
| Specific rotation [a]D25 | / | / | +12.6°-+14.0° |
| Light | ≥ 98.0% | / | / |
| Solution appearance | / | clear & colorless ≤BY7 | / |
| chloride | ≤0.02% | ≤0.02% | ≤0.05% |
| Ammonium salt | ≤0.02% | ≤0.02% | / |
| sulfate | ≤0.02% | ≤0.03% | ≤0.03% |
| Iron salts | ≤10PPM | ≤10PPM | ≤30PPM |
| heavy metal | ≤10PPM | / | / |
| Arsenic salts | ≤1PPM | / | / |
| Other amino acids | ≤0.5% | / | individual impurities≤0.5% total impurities≤2.0% |
| Ninhydrin active substance | / | Each impurities≤ 0.2% Total impurities≤ 0.5% | / |
| Loss on drying | ≤0.20% | ≤0.50% | ≤0.20% |
| Residue on ignition | ≤0.10% | ≤0.10% | ≤0.40% |
| endotoxin | ＜6 EU/g | ＜6 EU/g | ＜6 EU/g |
| Total bacteria | ≤ 500 CFU/g | ≤ 500 CFU/g | ≤ 500 CFU/g |
| Mold & yeast | ≤ 50 CFU/g | ≤ 50 CFU/g | ≤ 50 CFU/g |