Yeast extract is obtained by aqueous extraction of autolyzed baker's yeast. It has a high vitamin content and provides excellent growth conditions for a number of microorganisms.
| Expiration date | Exp 60 months from mfg date |
| Test date | Per Merck CofA |
| Appearance (color) | Brownish-yellow |
| Appearance (description) | Granules |
| Calcium (Ca) | 0.05% max |
| Chloride (as NaCl) | 5.0% max |
| Heavy metals (as Pb) | 0.005% max |
| Loss on drying | 5.0% max |
| Magnesium (Mg) | 0.10% max |
| Nitrogen (calc. on dried substance) | 10.5% min |
| pH (2%, water) | 5.5-7.2 |
| Phosphorus compounds (as P) | 2.5% max |
| Suitability for microbiology | Passes test |
| Sulfated ash (600 C) | 17.0% max |