Table 3.
Experimental results for samples from the central composite design.
| Independent Variables | Responses Variables | |||||
|---|---|---|---|---|---|---|
| Run | X1: Solid/Solvent Ratio (g/mL) |
X2: Ethanol/Water Ratio (v/v) |
Y1: TPC (mg GAE/g Sample dw) |
Y2: DPPH (mg Trolox/g Sample dw) |
Y3: FRAP (mg FeSO4/g Sample dw) |
Y4: ORAC (µmol Trolox/g Sample dw) |
| 1 | 1/20 | 50/50 | 105.99 ± 0.85 | 152.3 ± 3.0 | 102.4 ± 2.7 | 130 ± 1.4 |
| 2 | 1/30 | 75/25 | 102.21 ± 0.71 | 199.4 ± 2.8 | 123.7 ± 3.4 | 182.3 ± 2.5 |
| 3 | 1/10 | 25/75 | 31.17 ± 0.18 | 75.4 ± 1.1 | 65.2 ± 0.2 | 78.4 ± 0.86 |
| 4 | 1/10 | 75/25 | 45.95 ± 0.10 | 91.6 ± 0.6 | 83.1 ± 1.4 | 121.81 ± 0.64 |
| 5 | 1.4/40 | 50/50 | 67.02 ± 0.12 | 153.0 ± 0.8 | 78.4 ± 1.7 | 142.4 ± 4.4 |
| 6 | 1/30 | 25/75 | 57.07 ± 0.40 | 86.6 ± 1.9 | 59.6 ± 0.9 | 102.2 ± 0.86 |
| 7 | 1/20 | 50/50 | 106.01 ± 0.85 | 153.8 ± 1.5 | 96.6 ± 0.2 | 137.07 ± 0.06 |
| 8 | 1.4/14 | 50/50 | 50.12 ± 0.04 | 89.3 ± 0.1 | 80.5 ± 2.0 | 102.95 ± 0.38 |
| 9 | 1/20 | 35/65 | 65.05 ± 0.10 | 127.8 ± 0.5 | 81.2 ± 3.3 | 154.83 ± 1.08 |
| 10 | 1/20 | 65/35 | 82.43 ± 0.02 | 166.4 ± 0.9 | 120.3 ± 3.4 | 167.3 ± 0.84 |
TPC: total phenolic content; DPPH radical scavenging activity; FRAP: ferric reducing antioxidant power; ORAC: oxygen radical absorbance capacity; GAE: gallic acid equivalents; dw: dry weight. Mean data with their corresponding standard deviations are reported for each parameter.