L-Isoleucine
Molecular Formula: C6H13NO2
Molecular Weight: 131.17
CAS No： 73-32-5
| L-Isoleucine | CP2020 | EP11 | USP2023 |
| Assay | ≥98.5% | 98.5-101.0% | 98.5-101.5% |
| PH | 5.5-6.5 | / | 5.5-7.0 |
| Specific rotation[a]D20 | +38.9°-+41.8° | +40.0-+43.0 | / |
| Specific rotation[a]D25 | / | / | +38.9°-+41.8° |
| Transmittance(T430) | ≥98.0% | / | / |
| Appearance of solution | / | clear & colorless ≤BY6 | / |
| Chloride(Cl) | ≤0.02% | ≤0.02% | ≤0.05% |
| Ammonium(NH4) | ≤0.02% | ≤0.02% | / |
| Sulfate(SO4) | ≤0.02% | ≤0.03% | ≤0.03% |
| Iron(Fe) | ≤10PPM | ≤10PPM | ≤30PPM |
| Heavy metals(Pb) | ≤10PPM | / | / |
| Arsenic | ≤1PPM | / | / |
| 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% |
| Residue on ignition | ≤0.10% | ≤0.10% | ≤0.30% |
| Endotoxin | ＜20EU/g | ＜20EU/g | ＜20EU/g |
| Total plate count | ≤ 500 CFU/g | ≤ 500 CFU/g | ≤ 500 CFU/g |
| Moulds & Yeasts | ≤ 50 CFU/g | ≤ 50 CFU/g | ≤ 50 CFU/g |