Antibiotic Assay Medium No.41 (DM213U) is recommended for the microbiological assay of Thiostrepton using Streptococcus faecium as the test organism, in compliance with USP.
| Ingredients | Gms / Liter |
| Pancreatic digest of casein | 9.00 |
| Dextrose | 20.00 |
| Yeast extract | 5.00 |
| Sodium citrate | 10.00 |
| Monobasic potassium phosphate | 1.00 |
| Dibasic potassium phosphate | 1.00 |
| Final pH: 6.8 ± 0.1 at 25°C | |
| Formula may be adjusted and/or supplemented as required to meet performance specifications | |
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