L-Isoleucine
Molecular Formula: C6H13NO2
Molecular Weight: 131.17
CAS No： 73-32-5
| L-Isoleucine | CP2020 | EP11 | USP2023 | USP24 | FCC11 |
| Assay | ≥98.5% | 98.5-101.0% | 98.5-101.5% | 98.5-101.5% | 98.5～101.5% |
| PH | 5.5-6.5 | / | 5.5-7.0 | 5.5-7.0 | 5.5-7.0 |
| Specific rotation[a]D20 | +38.9°-+41.8° | +40.0-+43.0 | / | / | +38.6～+41.5° |
| Specific rotation[a]D25 | / | / | +38.9°-+41.8° | +38.9°-+41.8° | +38.2～+41.1° |
| Transmittance(T430) | ≥98.0% | / | / | / | / |
| Appearance of solution | / | clear & colorless ≤BY6 | / | / | / |
| Chloride(Cl) | ≤0.02% | ≤0.02% | ≤0.05% | ≤0.05% | / |
| Ammonium(NH4) | ≤0.02% | ≤0.02% | / | / | / |
| Sulfate(SO4) | ≤0.02% | ≤0.03% | ≤0.03% | ≤0.03% | / |
| Iron(Fe) | ≤10PPM | ≤10PPM | ≤30PPM | ≤30PPM | / |
| Heavy metals(Pb) | ≤10PPM | / | / | ≤15PPM | / |
| Arsenic | ≤1PPM | / | / | / | / |
| Lead | / | / | / | / | ≤ 5 ppm |
| Other amino acids | ≤0.5% | / | Individual impurities≤0.5% Total impurities≤2.0% | / | / |
| Ninhydrin-positive substances | / | Impurities A and C at 570 nm≤ 0.3% Each impruity ≤0.2% Total ≤1.0% | / | / | / |
| Loss on drying | ≤0.20% | ≤0.5% | ≤0.30% | ≤0.30% | ≤0.30% |
| Residue on ignition | ≤0.10% | ≤0.10% | ≤0.30% | ≤0.30% | ≤0.20% |
| Insoluble foreign matter | / | / | / | / | ≤50 ppm |
| Organic volatile impurities | / | / | / | conforms | / |
| Endotoxin | ＜20EU/g | ＜20EU/g | ＜20EU/g | / | / |
| 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 |