| L-蛋氨酸 | CP2020 | EP11 | USP2023 |
| 含量 | ≥98.5% | 99.0-101.0% | 98.5-101.5% |
| 酸度 | 5.6-6.1 | 5.5-6.5 | 5.6-6.1 |
| 比旋度[a]D20 | +21.0°-+25.0° | +22.5°-+24.0° | / |
| 比旋度[a]D25 | / | / | +22.4°-+24.7° |
| 透光 | ≥98.0% | / | / |
| 溶液外觀 | / | clear & colorless | / |
| 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 | ≤15PPM | ≤10PPM | ≤30PPM |
| 重金屬 | ≤10PPM | / | / |
| 砷鹽 | ≤1PPM | / | / |
| 其他氨基酸 | ≤0.5% | Each impurity≤ 0.1% Total impurities≤ 0.3% | Methionine sulfoxide≤0.1% N-Acetyl-D,L-methionine≤0.2% Any unspecified impurity≤0.1% Total unspecified impurities≤0.3% |
| 茚三酮活性物質 | / | / | / |
| 干燥失重 | ≤0.2% | ≤0.50% | ≤0.3% |
| 熾灼殘渣 | ≤0.1% | ≤0.10% | ≤0.4 |
| 內毒素 | ＜25 EU/g | ＜25 EU/g | ＜25 EU/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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