Table 1.
Levels of orthogonal design
| Levels | Tryptone (A, %) | Soluble starch (B, %) | Sucrose (C, %) | FeSO4(D, %) | K2HPO4 (E, %) |
|---|---|---|---|---|---|
| 1 | 0.3 | 0.05 | 0.05 | 0.05 | 0.4 |
| 2 | 0.5 | 0.1 | 0.1 | 0.1 | 0.8 |
| 3 | 0.7 | 0.2 | 0.2 | 0.15 | 1.2 |
| 4 | 1.0 | 0.4 | 0.3 | 0.2 | 1.6 |
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