Fig. 6
From: Optimization of biomass pretreatments using fractional factorial experimental design
Response surfaces indicating the characteristics of the reducing sugar release as a function of the two most important factors for EA samples: NaOH concentration and ball mill time. The other factors were kept constant in a [H2SO4] in step 1 = 0%; time = 100 min and temperature of step 2 = 85 °C, and in b [H2SO4] in step 1 = 0%; time = 20 min and temperature of step 2 = 85 °C