Research Article
Parrotia persica as a Potential Source of Bioactive Phenolic Compounds: Optimization of Extraction Parameters and Biological Activity Assay
Table 1
The operational parameters affecting the extraction of P. persica and their levels.
| | Extraction method | Xj | Factor levels | | −α | −1 | 0 | 1 | +α |
| | Conventional | Solvent-to-feed ratio (X1; ml·g−1) | 5 : 1 | 10 : 1 | 17.5 : 1 | 25 : 1 | 30 : 1 | | Time (X2; min) | 8 | 14 | 22 | 30 | 36 | | Ethanol concentration (X3; %, v/v (ethanol/water)) | 50 | 65 | 75 | 85 | 100 |
| | UAE | Feed-to-solvent ratio (X1; ml·g−1) | 7.5 : 1 | 15 : 1 | 22.5 : 1 | 30 : 1 | 37.5 : 1 | | Time (X2; min) | 0 | 15 | 30 | 45 | 60 | | Ethanol concentration (X3; %, v/v (ethanol/water)) | 20 | 40 | 60 | 80 | 100 | | Temperature (X4; °C) | 7.5 | 25 | 42.5 | 60 | 77.5 |
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