Variables
Coded setting levels
-1
0
+1
Xylan (g/L)
5
10
15
Yeast Extract (g/L)
1
2
3
MgSO
4
.7H
2
O (g/L)
0.1
0.3
0.5
(NH
4
)
2
SO
4
(g/L)
0
2.2
4.4
Peptone (g/L)
1
2
3
pH
5
6
7
Temperature (
°
C)
25
30
35
Table 2:
Process variables used in the Plackett & Burman design, showing the treatment combinations.
