Table 3 Experimental domain and level distribution used for enzyme ratio optimization
From: Bioethanol production from rice straw by popping pretreatment
Variables | Coded level | Level | ||||
|---|---|---|---|---|---|---|
-2 | -1 | 0 | +1 | +2 | ||
Cellulase (FPU/g biomass) | x 1 | 0 | 10 | 20 | 30 | 40 |
Xylanase (IU/g biomass) | x 2 | 0 | 50 | 100 | 150 | 200 |