Independent variables

Symbol

Range and levels

 

 

-1

0

1

Xylose concentration (M)

X1

0.033

0.066

0.100

Glucose concentration (M)

X2

0.033

0.066

0.100

Xylose reductase load (U.mL-1)

X3

0.20

0.40

0.60

Glucose reductase load (U.mL-1)

X4

0.20

0.40

0.60

NADPH concentration (mM)

X5

0.20

0.40

0.60
Table 1: Study range and levels with real values of the independent variables used for the 25-1 experimental design carried out to select and evaluate variables on the performance of the batch xylitol enzymatic production.