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| Items | Requirements |
| Morphology | Powder, no caking |
| Color | Light yellow powder |
| Odor | Endemic taste and odor of product, no other peculiar smell |
| Impurity | No normal visible extraneous impurity |
| Item | Reagent Grade |
| Total Nitrogen (on DM) % | ≥14.0 |
| Amino Nitrogen (on DM) % | ≥2.5% |
| Ash (on DM) % | ≤13% |
| Moisture % | ≤6.0% |
| PH (2% solution) | 4.5–7.0 |
| Solubility (2% solution) | Pellucid |