Table 5.
Central composite rotatable design for Response Surface Analysis of antioxidant extraction from potato peel using methanol.
| Run | Methanol concentration (%v/v) | Time (min) | Power (%) | Total Phenolic (mg/g dw) | Ascorbic acid content (mg/g dw) | Chlorogenic acid content (mg/g dw) | Caffeic acid content (mg/g dw) | Ferulic acid content (mg/g dw) | DPPH (%) |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 0 | 0 | 0 | 3.626 | 1.109 | 0.62 | 0.63 | 0.34 | 57.27 |
| 2 | 0 | 0 | -1 | 3.504 | 1.125 | 0.465 | 0.581 | 0.37 | 55.20 |
| 3 | 0 | 0 | 0 | 3.733 | 0.917 | 0.571 | 0.627 | 0.288 | 56.65 |
| 4 | 0 | 0 | 0 | 3.605 | 1.062 | 0.725 | 0.961 | 0.367 | 55.5 |
| 5 | -1 | 0 | 0 | 2.595 | 1.025 | 0.258 | 0.284 | 0.162 | 34.03 |
| 6 | 0 | 0 | 0 | 3.701 | 1.492 | 0.658 | 0.742 | 0.319 | 57.55 |
| 7 | -1 | 1 | -1 | 2.964 | 1.577 | 0.362 | 0.642 | 0.238 | 42.35 |
| 8 | 0 | -1 | 0 | 3.729 | 1.087 | 0.532 | 0.59 | 0.23 | 68.55 |
| 9 | 1 | -1 | -1 | 3.151 | 1.478 | 1.674 | 1.524 | 0.31 | 70.66 |
| 10 | -1 | -1 | -1 | 2.051 | 0.92 | 0.328 | 0.228 | 0.16 | 52.33 |
| 11 | 1 | 1 | 1 | 3.001 | 1.012 | 0.774 | 0.892 | 0.374 | 70.46 |
| 12 | 0 | 0 | 0 | 3.515 | 1.097 | 0.435 | 0.493 | 0.342 | 56.67 |
| 13 | 1 | 1 | -1 | 3.21 | 1.915 | 1.524 | 1.411 | 0.381 | 73.32 |
| 14 | 0 | 1 | 0 | 3.924 | 1.167 | 0.861 | 0.92 | 0.44 | 72.94 |
| 15 | -1 | -1 | 1 | 2.37 | 0.917 | 0.37 | 0.288 | 0.16 | 41.4 |
| 16 | -1 | 1 | 1 | 2.969 | 1.02 | 0.279 | 0.407 | 0.206 | 48.66 |
| 17 | 1 | 0 | 0 | 3.12 | 1.106 | 1.033 | 1.19 | 0.396 | 66.45 |
| 18 | 1 | -1 | 1 | 3.067 | 1.262 | 1.392 | 1.228 | 0.419 | 69.5 |
| 19 | 0 | 0 | 0 | 3.675 | 1.51 | 0.521 | 0.491 | 0.427 | 72.34 |
| 20 | 0 | 0 | 1 | 3.541 | 0.954 | 0.585 | 0.57 | 0.317 | 86.23 |