초록
<P><B>Abstract</B></P> <P>Sugarcane bagasse pretreated by combining O<SUB>2</SUB> and NaOH with different variables was conducted to improve its enzymatic digestibility and sugar recovery, and the results were compared with sole NaOH pretreatment. Lignin removal for O<SUB>2</SUB>–NaOH pretreatment was around 10% higher than that for sole NaOH pretreatment under the same conditions, and O<SUB>2</SUB>–NaOH pretreatment resulted in higher glucan recovery in the solid remain. Subsequently, O<SUB>2</SUB>–NaOH pretreated sugarcane bagasse presented more efficient enzymatic digestibility than sole NaOH pretreatment. Under the moderate pretreatment conditions of combining 1% NaOH and 0.5MPa O<SUB>2</SUB> at 80°C for 120min, a high glucan conversion of 95% was achieved after 48h enzymatic hydrolysis. Coupled with the operations of pretreatment and enzymatic hydrolysis, an admirable total sugar recovery of 89% (glucose recovery of 93% and xylose recovery of 84%) was obtained. The susceptibility of the substrates to enzymatic digestibility was explained by their physical and chemical characteristics.</P> <P><B>Highlights</B></P> <P> <UL> <LI> An effective pretreatment of sugarcane bagasse by combining O<SUB>2</SUB> and NaOH was developed. </LI> <LI> O<SUB>2</SUB>–NaOH pretreatment offers advantages in lignin removal and enzymatic digestibility. </LI> <LI> Total sugar recovery from both pretreatment and enzymatic hydrolysis reached 89%. </LI> <LI> Susceptibility of substrates to enzymolysis was explained by their characteristics. </LI> </UL> </P>