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Range of different factors investigated with Plackett-Burman.
| Variable | Real Variables/(Unit) | Low Level (−1) | High Level (+1) |
|---|---|---|---|
| X1 | glucose/(g/L) | 15 | 25 |
| X2 | yeast extract/(g/L) | 7 | 13 |
| X3 | dipotassium phosphate/(g/L) | 3 | 6 |
| X4 | manganese sulfate/(g/L) | 0.08 | 0.16 |
| X5 | Tween 80/(mL/L) | 2 | 4 |
| X6 | sodium acetate/(g/L) | 5 | 10 |
