Process Variables
Range and Level
-1
0
+1
Initial pH ( X
1
)
7.0
8.0
9.0
Moisture ratio ( X
2
)
1:0.5
1:1
1:1.5
Incubation time ( X
3
)
24 h
48 h
72 h
Table 1:
Experimental range and coded levels of process variables for cellulase production.
