Fig. 4

Comparison of enzymatic hydrolysis yields [glucose (a) and xylose (b)] and total yields of sugar [glucose (c) and xylose (d)] of raw, NaOH-pretreated and NaOH–ethanol-pretreated materials with adding xylanase. The sample (2%, w/v) was hydrolyzed at 50 °C for 72 h using cellulose cocktail (15 FPU/g substrate Cellic^® CTec2, 30 CBU/g substrate β-glucosidase and 15 BXU/g substrate xylanase)