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| Item | STANDARD |
| Identification, (IR) | Positive |
| Assay (C3H7NO2) ,%(on dried basis) | 99.0~101.0 |
| Specific rotation | +14.3°~ +15.° |
| State of solution, % | 98.0 |
| Chloride(as Cl),% | =<0.020 |
| Ammonium (as NH4),% | =<0.02 |
| Sulphate (as SO4),% | =<0.020 |
| Iron(as Fe), ppm | =<10 |
| Heavy metals (as Pb), ppm | =<10 |
| Arsenic(as As2O3), ppm | =<1 |
| Other amino acids | Meets the requirements |
| Loss on drying, % | =<0.20 |
| Residue on ignition(as sulphated ash), % | =<0.10 |
| pH value (1.0g/20mL water) | 5.7~6.7 |
