Optimized Biotransformation of Icariin into Icariside II by β-Glucosidase from Trichoderma viride Using Central Composite Design Method

Table 1

Levels of variables used in the experimental design.

Independent variables	Levels
		−1	0	1
pH ()	3.32	4.0	5.0	6.0	6.68
Temperature () (°C)	23.18	30	40	50	56.86
Concentration of substrate () (mg mL^−1)	0.30	0.30	0.65	1.00	1.24

: 1.682.