Factors and levels of Box–Behnken experiments.
| Level | (A) Temperature/°C | (B) SO2 addition amount/(mg mL−1) | (C) Initial sugar content/% |
|---|---|---|---|
| −1 | 26 | 30 | 22 |
| 0 | 28 | 60 | 24 |
| 1 | 30 | 90 | 26 |
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