Table 3.
Levels of factors used in the Box-Behnken design.
| Factors | Level (g/L) | ||
|---|---|---|---|
| −1 | 0 | 1 | |
| (A) Aspartic acid | 2 | 3 | 4 |
| (B) Phenylalanine | 1 | 1.5 | 2 |
| (C) CEGA | 5 | 7 | 9 |
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