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Concentration ranges of the variables used in the Plackett–Burman design
| Factors (g/L) |
Actual levels of coded factors − 1 + 1 |
|
|---|---|---|
| Glucose | 5 | 10 |
| Sorbitol | 5 | 10 |
| Glycerol | 5 | 10 |
| Peptone | 4 | 8 |
| Tryptone | 4 | 8 |
| Meat extract | 5 | 10 |
| Yeast extract | 5 | 10 |
| Potassium dihydrogen phosphate | 4 | 8 |
| Magnesium sulfate | 0.5 | 1 |
| Citric acid | 0.5 | 1 |
| Thiamine | 0.5 | 1 |
