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Table 2 Experimental range and levels of the independent variables in terms of actual and coded factors in the optimization of enzyme amount and H2O2 flow rate

From: Lignin degradation in corn stalk by combined method of H2O2 hydrolysis and Aspergillus oryzae CGMCC5992 liquid-state fermentation

Independent variable Symbol Level
−1 0 1
Enzyme volume X 1 25 50 75
H2O2 concentration (%) X 2 0.9 1.5 2.1
H2O2 flow rate X 3 0.3 0.4 0.5
H2O2 volume X 4 60 80 100