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| Table 1. Levels of factors used in the experimental design. |
Factor |
Name |
Levels |
||||
-a |
-1 |
0 |
+1 |
+a |
||
X1 |
pH |
5 |
6 |
7 |
8 |
9 |
X2 |
Agitation speed (rpm) |
100 |
150 |
200 |
250 |
300 |
X3 |
Sugar conc. (g l-1) |
10 |
20 |
30 |
40 |
50 |
X4 |
Time (h) |
24 |
36 |
48 |
60 |
72 |
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