Skip to main content

Table 1 Variables and levels of the Box–Behnken experiment

From: Novel optimization strategy for tannase production through a modified solid-state fermentation system

Variables Levels of variables
Code − 1 0 1
Tannin (%) A 3 6 9
Glucose (%) B 3 6 9
(NH4)2SO4 (%) C 6 9 12
Yeast extract (%) D 1 3.5 6