Table 1 Central composite circumscribed (CCC) design with five levels and three variables for phenolic compound extraction in D. indicum var. aromaticum flower and observed responsesa.
Run order | Independent variables | TP content (g GAEb/100 g DW) | |||||
|---|---|---|---|---|---|---|---|
Coded | Uncoded | ||||||
Time (min) | Solid/liquid ratio (g/mL) | Temperature (°C) | Time (min) | Solid/liquid ratio (g/mL) | Temperature (°C) | ||
1 | −1 | −1 | −1 | 20 | 1:10 | 40 | 0.71 |
2 | 1 | −1 | −1 | 40 | 1:10 | 40 | 0.93 |
3 | −1 | 1 | −1 | 20 | 1:30 | 40 | 1.16 |
4 | 1 | 1 | −1 | 40 | 1:30 | 40 | 1.04 |
5 | −1 | −1 | 1 | 20 | 1:10 | 60 | 0.84 |
6 | 1 | −1 | 1 | 40 | 1:10 | 60 | 1.03 |
7 | −1 | 1 | 1 | 20 | 1:30 | 60 | 1.27 |
8 | 1 | 1 | 1 | 40 | 1:30 | 60 | 1.21 |
9 | −1.68 | 0 | 0 | 13 | 1:20 | 50 | 1.11 |
10 | 1.68 | 0 | 0 | 47 | 1:20 | 50 | 1.28 |
11 | 0 | −1.68 | 0 | 30 | 1:03 | 50 | 0.68 |
12 | 0 | 1.68 | 0 | 30 | 1:37 | 50 | 1.23 |
13 | 0 | 0 | −1.68 | 30 | 1:20 | 33 | 0.89 |
14 | 0 | 0 | 1.68 | 30 | 1:20 | 67 | 1.13 |
15 | 0 | 0 | 0 | 30 | 1:20 | 50 | 1.02 |
16 | 0 | 0 | 0 | 30 | 1:20 | 50 | 1.20 |
17 | 0 | 0 | 0 | 30 | 1:20 | 50 | 1.07 |
18 | 0 | 0 | 0 | 30 | 1:20 | 50 | 1.26 |
19 | 0 | 0 | 0 | 30 | 1:20 | 50 | 1.15 |
20 | 0 | 0 | 0 | 30 | 1:20 | 50 | 1.07 |
