Description
Quality standard
(1) Sensory index
| Items | Requirements | 
| Morphology | Powder, no clumping | 
| Color | Milky white to pale yellow powder | 
| Odor | Inherent smell of the product, no other peculiar smell | 
| Impurity | No visible impurity | 
(2) Physicochemical index
| Items | Industrial grade | Pharmaceutic grade | 
| Total nitrogen
 (on DM) %  | 
≥12.0 | ≥12.0 | 
| Amino nitrogen
 (on DM) %  | 
≥3.0 | ≥3.0 | 
| Ash
 (on DM) %  | 
≤12.0 | ≤12.0 | 
| Loss on Drying % | ≤7.0 | ≤7.0 | 
| Sodium chloride
 (on DM)  | 
__
 
  | 
|
| Tryptophan | __ | |
| Nitrite | __ | |
| PH (2% solution) | 5.0—7.0 | |
| Acid solution &
 alkalescence high-pressure test  | 
 
 __  | 
|
| Solubility,(2% water) | Soluble | Complete | 




