L-谷氨酸
L-谷氨酸
| Test Items | Limit |
| Molecular Structure |  |
| Charactcrs | A white,crystalline powder or Colorless crystals |
| Identification | A. Specific optical rotation B. IR C. TLC D.Color reaction |
| Specific rotation [a]D20° | +31.5° to +32.5° |
| Appearance of solution | clear and colorless |
| Ninhydrin-positive | Any impurity |
| Substances | not more than 0.5% |
| Chloride(cl) | not more than 0.020% |
| Sulfate(SO4) | not more than 0.030% |
| Iron(Fe) | not more than 10ppm |
| Heavy metals(Pb) | not more than 10ppm |
| Ammonium | not more than 0.02% |
| Loss on drying | not more than 0.50% |
| Assay | 98.5% to 100.5% |
| PH | 3.0 to 3.5 |
