초록
To improve the cellulose digestibility of energy crop Arudo donax Linn. with cost-efficient, a novel pretreatment of protic acid resin Amberlyst 35DRY catalyzed inexpensive ionic liquid (IL) 1-butyl-3-methylimidazolium chloride ([C<SUB>4</SUB>mim]Cl) was developed in this work. The pretreatment was performed at 160<SUP>o</SUP>C with [C<SUB>4</SUB>mim]Cl for 1.5h, followed by Amberlyst 35DRY catalyzed at 90<SUP>o</SUP>C for 1h. The IL-Amberlyst pretreatment was demonstrated to be effective, evidenced by the reduction in cellulose crystallinity (31.4%) and increased porosity caused by extensive swelling the undissolved biomass and partial depolymerization of the longer cellulose chain of the dissolved biomass by Amberlyst. Consequently, a higher glucose yield (92.8%) was obtained than for the single [C<SUB>4</SUB>mim]Cl pretreatment (42.8%) at an enzyme loading of 20FPU/g substrate. Overall, the enhanced pretreatment was competitive by using inexpensive and recyclable IL-Amberlyst 35DRY pretreated system with shorter processing time and reduced enzyme usage.