| L-异亮氨酸 | CP2020 | EP11 | USP2023 | USP24 | FCC11 |
| 含量 | ≥98.5% | 98.5-101.0% | 98.5-101.5% | 98.5-101.5% | 98.5～101.5% |
| 酸度 | 5.5-6.5 | / | 5.5-7.0 | 5.5-7.0 | 5.5-7.0 |
| 比旋度[a]D20 | +38.9°-+41.8° | +40.0-+43.0 | / | / | +38.6～+41.5° |
| 比旋度[a]D25 | / | / | +38.9°-+41.8° | +38.9°-+41.8° | +38.2～+41.1° |
| 透光 | ≥98.0% | / | / | / | / |
| 溶液外观 | / | clear & colorless ≤BY6 | / | / | / |
| 氯化物 | ≤0.02% | ≤0.02% | ≤0.05% | ≤0.05% | / |
| 铵盐 | ≤0.02% | ≤0.02% | / | / | / |
| 硫酸盐 | ≤0.02% | ≤0.03% | ≤0.03% | ≤0.03% | / |
| 铁盐 | ≤10PPM | ≤10PPM | ≤30PPM | ≤30PPM | / |
| 重金属 | ≤10PPM | / | / | ≤15PPM | / |
| 砷盐 | ≤1PPM | / | / | / | / |
| 铅 | / | / | / | / | ≤ 5 ppm |
| 其他氨基酸 | ≤0.5% | / | Individual impurities≤0.5% Total impurities≤2.0% | / | / |
| 茚三酮活性物质 | / | Impurities A and C at 570 nm≤ 0.3% Each impruity ≤0.2% Total ≤1.0% | / | / | / |
| 干燥失重 | ≤0.20% | ≤0.5% | ≤0.30% | ≤0.30% | ≤0.30% |
| 炽灼残渣 | ≤0.10% | ≤0.10% | ≤0.30% | ≤0.30% | ≤0.20% |
| 不溶性杂质 | / | / | / | / | ≤50 ppm |
| 有机挥发物 | / | / | / | conforms | / |
| 总菌 | ≤ 1000 CFU/g | ≤ 1000 CFU/g | ≤ 1000 CFU/g | ≤ 1000 CFU/g | ≤ 1000 CFU/g |
| 霉菌&酵母菌 | ≤ 100 CFU/g | ≤ 100 CFU/g | ≤ 100 CFU/g | ≤ 100 CFU/g | ≤ 100 CFU/g |
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