Molecular Formula: C11H12N2O2
Molecular Weight: 204.23
CAS No： 73-22-3
| L-Tryptophan | CP2020 | EP11 | USP2023 | AJI92 |
| Assay | ≥99.0% | 98.5-101.0% | 98.5-101.5% | 99.0-100.5% |
| PH | 5.4-6.4 | / | 5.5-7.0 | 5.4-6.4 |
| Specific rotation[a]D20 | -30.0°--32.5° | -30.0°--33.0° | / | -30.5°--32.5° |
| Specific rotation[a]D25 | / | / | -29.4°--32.8° | / |
| Transmittance(T430) | ≥95.0% | / | / | ≥95.0% |
| Appearance of solution | / | clear & colorless ≤BY6 | / | / |
| Chloride(Cl) | ≤0.02% | ≤0.02% | ≤0.05% | ≤0.02% |
| Ammonium(NH4) | ≤0.02% | ≤0.02% | / | ≤0.02% |
| Sulfate(SO4) | ≤0.02% | ≤0.03% | ≤0.03% | ≤0.02% |
| Iron(Fe) | ≤20PPM | ≤20PPM | ≤30PPM | ≤20PPM |
| Heavy metals(Pb) | ≤10PPM | / | / | ≤10PPM |
| Arsenic | ≤1PPM | / | / | ≤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 | conform |
| Ninhydrin-positive substances | / | Each impurity≤0.2% Total impurities≤0.5% | / | / |
| Loss on drying | ≤0.20% | ≤0.50% | ≤0.30% | ≤0.20% |
| Residue on ignition | ≤0.10% | ≤0.10% | ≤0.10% | ≤0.10% |
| Total plate count | ≤ 500 CFU/g | ≤ 500 CFU/g | ≤ 500 CFU/g | ≤ 500 CFU/g |
| Moulds & Yeasts | ≤ 50 CFU/g | ≤ 50 CFU/g | ≤ 50 CFU/g | ≤ 50 CFU/g |
| Pathogenic Bacterium | Cronobacter spp /Enterobacteriaceae /Salmonella /Bacillus cereus /Sulphite-reducing clostridia(SRC) （Can be tested upon request） | |||
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