| ITEM | STANDARD |
| Appearance | White crystals or crystalline Powder |
| Specific rotation | +38.6-+41.5 |
| PH | 5.5-7.0 |
| Loss on drying | =<0.3% |
| Heavy metals(Pb) | =<20ppm |
| Content | 98.5~101.0% |
| Iron(Fe) | =<20ppm |
| Arsenic(As2O3) | =<1ppm |
| Lead | =<10ppm |
| Other Amino Acids | Chromatographically not detectable |
| Residue on ignition (Sulfated) | =<0.2% |
| Organic Volatile impurities | Meets the requirements of pharmacopoeis |