Research Article
Optimization of Extraction of Natural Pigment from Purple Sweet Potato by Response Surface Methodology and Its Stability
Table 1
The coding schedule of response surface methodology.
| | Independent variable/unit | Symbol | Level | | −1 | 0 | 1 |
| | Extraction temperature/°C | | 55 | 60 | 65 | | Time/min | | 50 | 60 | 70 | | Solid-liquid ratio/1 : | | 25 | 30 | 35 | | Acidified ethanol aqueous solution concentration/% | | 75 | 80 | 85 |
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