Independent variables

Symbol

Range and levels

 

 

-√2

-1

0

1

√2

Xylose concentration (M)

X1

0.039

0.100

0.250

0.400

0.460

NADPH concentration (mM)

X5

0.23

0.60

1.50

2.40

2.80
Table 2: Study range and levels with real values of the independent variables used for the 22 experimental design carried out to optimize the batch xylitol enzymatic production.