Table 4.
Independent variables and experimental data of the response design for the PHWE of phenolic antioxidants from Bambusa chungii culms.
| Run | Independent Variables | Dependent Variables: Experimental Values | |||||
|---|---|---|---|---|---|---|---|
| A (mL/g) | B (min) | C (°C) | Y1 (mg/g RM) |
Y2 (mg−1/mL−1) |
Y3 (mg−1/mL−1) |
Y4 (μmol FSE/mg DW) | |
| 1 | 20 | 20 | 140 | 2.29 | 7.34 | 19.32 | 0.77 |
| 2 | 20 | 5 | 180 | 2.64 | 7.40 | 41.65 | 0.88 |
| 3 | 30 | 10 | 180 | 3.35 | 10.71 | 50.71 | 1.09 |
| 4 | 20 | 10 | 160 | 3.26 | 8.95 | 46.47 | 1.00 |
| 5 | 20 | 10 | 160 | 3.09 | 9.23 | 38.93 | 1.00 |
| 6 | 20 | 10 | 160 | 3.24 | 9.68 | 38.77 | 1.01 |
| 7 | 30 | 20 | 160 | 4.08 | 8.92 | 45.68 | 1.08 |
| 8 | 30 | 5 | 160 | 3.34 | 8.05 | 42.88 | 1.01 |
| 9 | 15 | 20 | 160 | 2.90 | 7.01 | 30.33 | 0.95 |
| 10 | 15 | 10 | 140 | 1.51 | 5.60 | 20.12 | 0.66 |
| 11 | 30 | 10 | 140 | 1.89 | 6.26 | 18.50 | 0.75 |
| 12 | 20 | 20 | 180 | 2.53 | 8.06 | 33.98 | 0.89 |
| 13 | 15 | 10 | 180 | 2.40 | 7.87 | 32.59 | 0.91 |
| 14 | 20 | 5 | 140 | 1.06 | 6.02 | 17.56 | 0.57 |
| 15 | 15 | 5 | 160 | 2.53 | 7.85 | 34.04 | 0.97 |
| 16 | 20 | 10 | 160 | 3.22 | 8.90 | 35.73 | 0.92 |
| 17 | 20 | 10 | 160 | 3.28 | 8.23 | 33.43 | 0.94 |
A, material-to-liquid ratio; B, extraction time; C, temperature; Y1, total yield of target phenolic compounds; Y2, DPPH IC50−1; Y3, ABTS IC50−1; Y4, ferric reducing antioxidant power.