| L-色氨酸 | CP2020 | EP11 | USP2023 |
| 含量 | ≥99.0% | 98.5-101.0% | 98.5-101.5% |
| 酸度 | 5.4-6.4 | / | 5.5-7.0 |
| 比旋度[a]D20 | -30.0°--32.5° | -30.0°--33.0° | / |
| 比旋度[a]D25 | / | / | -29.4°--32.8° |
| 透光 | ≥95.0% | / | / |
| 溶液外觀 | / | clear & colorless ≤BY6 | / |
| 氯化物 | ≤0.02% | ≤0.02% | ≤0.05% |
| 銨鹽 | ≤0.02% | ≤0.02% | / |
| 硫酸鹽 | ≤0.02% | ≤0.03% | ≤0.03% |
| 鐵鹽 | ≤20PPM | ≤20PPM | ≤30PPM |
| 重金屬 | ≤10PPM | / | / |
| 砷鹽 | ≤1PPM | / | / |
| 其他氨基酸 | ≤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 |
| 茚三酮活性物質(zhì) | / | Each impurity≤0.2% Total impurities≤0.5% | / |
| 干燥失重 | ≤0.20% | ≤0.50% | ≤0.30% |
| 熾灼殘渣 | ≤0.10% | ≤0.10% | ≤0.10% |
| 內(nèi)毒素 | <50EU/g | <50EU/g | <50EU/g |
| 總菌 | ≤ 500 CFU/g | ≤ 500 CFU/g | ≤ 500 CFU/g |
| 霉菌&酵母菌 | ≤ 50 CFU/g | ≤ 50 CFU/g | ≤ 50 CFU/g |
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