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Sensory Index
| Items | Requirements |
|---|---|
| Morphology | Powder |
| Color | Light yellow or brown powder |
| Odor | Endemic taste and odor of product, no other peculiar smell |
| Impurity | No normal visible extraneous impurity |
Physicochemical Index
| Item | Industrial Grade | Pharmaceutical Grade | Reagent Grade |
|---|---|---|---|
| Total nitrogen (on DM) % | ≥7.5% | ≥8.0% | ≥8.0% |
| Amino nitrogen (on DM) % | ≥2.5% | ≥3.0% | ≥3.5% |
| Ash (on DM) % | ≤15.0% | ≤15.0% | ≤15.0% |
| Moisture % | ≤6.0% | ≤6.0% | ≤6.0% |
| PH (2% solution) | 4.5–7.5 | ||
| Acid solution & alkalescence high-pressure | —— | Pellucid | |
| Solubility (2% solution) | Slightly soluble | Complete lysis | |