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Levels of factors selected for optimization study using Box-Behnken design.
| Factor | Unit | Low level (− 1) | High level (+ 1) | Intermediate level (0) |
|---|---|---|---|---|
| Salt*1 concentration | mM | 0.1 | 2 | 1.05 |
| Filtrate*2 volume | ml | 1 | 20 | 10.5 |
| pH | – | 4 | 10 | 7 |
*1FeSo4·7 H2O.
*2Aspergillus flavipes MN956655.1 Culture filtrate.
