| Item | Standard |
| Appearance | White or colorless crystal powder, no impurity can be seen by naked eye. |
| Odor | No peculiar smell |
| Flavor | Sweet, no scenting, no peculiar smell |
| Content % | ≥99.5 |
| Ph value | 4.0-6.5 |
| Vitriol ash, %( m/m) | ≤0.25 |
| Specific Rotation° | +52.0~53.5° |
| Clorides % | ≤0.01 |
| Moisture, % (m/m) | ≤2.0 |
| Total plate count (cfu/g) | ≤3000 |
| Coliform (MPN/100g) | ≤30 |
| Storage | in the shade |
| Packing | 25kg per bag |


China