| DL-蛋氨酸 | EP6 | AJI92 | 
| 含量 | 99.0-101.0% | 99.0-100.5% | 
| 酸度 | 5.4-6.1 | 5.6-6.1 | 
| 比旋度[a]D20 | / | / | 
| 比旋度[a]D25 | / | / | 
| 透光 | / | ≥98.0% | 
| 溶液外观 | clear & colorless | / | 
| 氯化物 | ≤0.02% | ≤0.02% | 
| 铵盐 | / | ≤0.02% | 
| 硫酸盐 | ≤0.02% | ≤0.02% | 
| 铁盐 | / | ≤10PPM | 
| 重金属 | ≤20PPM | ≤10PPM | 
| 砷盐 | / | ≤1PPM | 
| 其他氨基酸 | / | conform | 
| 茚三酮活性物质 | / | / | 
| 干燥失重 | ≤0.50% | ≤0.30% | 
| 炽灼残渣 | ≤0.10% | ≤0.10% | 
| 总菌 | ≤ 1000 CFU/g | ≤ 1000 CFU/g | 
| 霉菌&酵母菌 | ≤ 100 CFU/g | ≤ 100 CFU/g |