Assays Xylan
(g/L)
Yeast Extract (g/L) MgSO4.7H2O  (g/L) (NH4)2SO4   (g/L) Peptone (g/L) pH Temp.
(°C)
Xylanase activity (IU/mL)
1 1 -1 1 -1 -1 -1 1 2.018
2 1 1 -1 1 -1 -1 -1 0.516
3 -1 1 1 -1 1 -1 -1 0.726
4 1 -1 1 1 -1 1 -1 0.256
5 1 1 -1 1 1 -1 1 1.247
6 1 1 1 -1 1 1 -1 0.598
7 -1 1 1 1 -1 1 1 0.644
8 -1 -1 1 1 1 -1 1 1.118
9 -1 -1 -1 1 1 1 -1 0.193
10 1 -1 -1 -1 1 1 1 3.211
11 -1 1 -1 -1 -1 1 1 1.448
12 -1 -1 -1 -1 -1 -1 -1 0.177
13 0 0 0 0 0 0 0 1.252
14 0 0 0 0 0 0 0 1.466
15 0 0 0 0 0 0 0 1.395
16 0 0 0 0 0 0 0 1.418
Table 6: Process variables used in the Plackett & Burman design showing the treatment combinations and the mean experimental response.