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Table 3 Experimental range and levels of the independent variables in terms of actual and coded factors in the optimization of conditions of hydrolysis reaction

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
Water material ratio X 1 8 10 12
Hydrolysis temperature X 2 35 40 45
Pretreatment temperature (°C) X 3 100 110 120
Pretreatment time X 4 5 10 15