| Appearance | White to off-white powder |
| Purity (HPLC) | ≥99.0% |
| Transmit tance | ≥95.0% |
| Chloride(CL) | ≤0.02% |
| Sulphate（SO42-） | ≤0.02% |
| Iron(Fe) | ≤10ppm |
| Residue on ignition | ≤0.1% |
| Heavy metal(Pb) | ≤10ppm |
| Arsenic | ≤1ppm |
| Assay | 98.0%～100.5% |
| Loss on drying | ≤0.20% |
| Other amino acids | Chromatographically not detectable |
| Conclusion | The results conform with AJI92 standard |