Molecular Formula: C11H12N2O2
Molecular Weight: 204.23
CAS No： 73-22-3
| L-Tryptophan | CP2020 | EP11 | USP2023 |
| Assay | ≥99.0% | 98.5-101.0% | 98.5-101.5% |
| PH | 5.4-6.4 | / | 5.5-7.0 |
| Specific rotation[a]D20 | -30.0°--32.5° | -30.0°--33.0° | / |
| Specific rotation[a]D25 | / | / | -29.4°--32.8° |
| Transmittance(T430) | ≥95.0% | / | / |
| 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) | ≤20PPM | ≤20PPM | ≤30PPM |
| Heavy metals(Pb) | ≤10PPM | / | / |
| Arsenic | ≤1PPM | / | / |
| Other amino acids | ≤0.50% | Impurity A≤10ppm Sum of impurities with a retention time less than that of Tryptophan <100ppm Sum of impurities with a retention time great than that of Tryptophan and up to 1.8 time of N-acetyltryptophan <300ppm | Total impurities 1≤0.01% Total impurities 2≤0.03% Tryptophan related compound A ≤10PPM |
| Ninhydrin-positive substances | / | Each impurity≤0.2% Total impurities≤0.5% | / |
| Loss on drying | ≤0.20% | ≤0.50% | ≤0.30% |
| Residue on ignition | ≤0.10% | ≤0.10% | ≤0.10% |
| Endotoxin | <50EU/g | <50EU/g | <50EU/g |
| Total plate count | ≤ 500 CFU/g | ≤ 500 CFU/g | ≤ 500 CFU/g |
| Moulds & Yeasts | ≤ 50 CFU/g | ≤ 50 CFU/g | ≤ 50 CFU/g |
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