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Independent parameters and their corresponding levels in the BBD for the optimization process.
| Independent Parameters | Symbol | Corresponding Levels | ||
|---|---|---|---|---|
| Low Level (−1) | Center Level (0) | High Level (+1) | ||
| Shellac concentration (% w/w) | x1 | 36 | 38 | 40 |
| Solution feed rate (mL/h) | x2 | 0.4 | 0.8 | 1.2 |
| Electrical voltage (kV) | x3 | 12 | 18 | 24 |
| KP extract content (% w/w) | x4 | 1 | 3 | 5 |
