Table 2 The Placket–Burman design matrix representing the coded values for independent factors and values of measured response
Run | Factors | Response | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Glu | Yeast | NaCl | NO3 | Fe | Mg | pH | Temp | conc | EDTA | Acetate | % decolorization | |
1 | + | – | + | – | – | – | + | + | + | – | + | 8.65 |
2 | + | + | – | + | – | – | – | + | + | + | – | 2.71 |
3 | – | + | + | – | + | – | – | – | + | + | + | 11.78 |
4 | + | – | + | + | – | + | – | – | – | + | + | 5.87 |
5 | + | + | – | + | + | – | + | – | – | – | + | 46.91 |
6 | + | + | + | – | + | + | – | + | – | – | – | 88.22 |
7 | – | + | + | + | – | + | + | – | + | – | – | 29.42 |
8 | – | – | + | + | + | – | + | + | – | + | – | 32.32 |
9 | – | – | – | + | + | + | – | + | + | – | + | 21.04 |
10 | + | – | – | – | + | + | + | – | + | + | – | 20.04 |
11 | – | + | – | – | – | + | + | + | – | + | + | 66.45 |
12 | – | – | – | – | – | – | – | – | – | – | – | 0.88 |
13 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 65.2 |