| Analytical Items | Standard |
| Appearance | White crystals or crystalline powder |
| Assay | 97%~103% |
| Odor & Taste | Characteristic |
| Identification (IR) | Meet the requirements |
| Specific Optical Rotation | -29°~ -32° |
| Moisture | ≤ 0.5 % |
| Residue on ignition | ≤ 0.1% |
| Heavy Metals | ≤ 10ppm |
| Pb | ≤ 2ppm |
| As | ≤ 2ppm |
| Cd | ≤ 1ppm |
| Hg | ≤ 0.1ppm |
| Residual Solvent | |
| Total plate count | <1000cfu/g |
| Yeast & Mould | <100cfu/g |
| E.Coli | Negative |
| Salmonella | Negative |
| Aflatoxins | Negative |