Description
Quality standard
(1) Sensory index
| Items | Yeast extract | Yeast powder | ||
| Industrial grade | Pharmaceutical grade | Industrial grade | Pharmaceutical grade | |
| Color | Yellowish brown or drab | Light yellow or drab | ||
| Morphology | paste | powder | ||
| Odor | Inherent smell of the product, no other peculiar smell | |||
(2) Physicochemical index
| Items | Yeast extract | Yeast powder | |||||
| Industrial grade | Pharmaceutical grade | Industrial grade | Pharmaceutical grade | ||||
| Loss on Drying % | ≤35.0 | ≤7.0 | ≤5.0 | ||||
| Total nitrogen
(on DM) % |
≥9.0 | ≥9.0 | ≤9.0 | ||||
| Amino nitrogen
(on DM) % |
≥3.0 | ≥3.0 | ≥4.0 | ||||
| Chloride
(Sodium Chloride basis) % |
__ | __ | ≤5.0 | ||||
| Ash
(on DM) % |
≤15.0 | ≤15.0 | ≤15.0 | ||||
| PH (2% solution) | 5.0—7.0 | 5.0—7.0 | 6.8-7.2 | ||||
| Acid solution &
alkalescence high-pressure test |
__ | __
|
|||||
| Solubility,(2% solution) | Soluble | complete | Soluble | complete | |||
