초록
<P><B>Abstract</B></P> <P>The effect of γ-irradiation pretreatment was compared with other pretreatment methods including ionic liquids (ILs), 1% HCl, 1% H<SUB>2</SUB>SO<SUB>4</SUB>, acidic aqueous Ils (AA-ILs), on the bioconversion efficiency of microcrystalline cellulose (MCC) for bioethanol production. The efficiency of MCC pretreatment followed with simultaneous saccharification and fermentation (SSF) was firstly evaluated according to the variations of the irradiation-derived compounds and structure of MCC, as well as yeast growth curve and bioethanol yield. Results showed that the appropriate irradiation dose (891kGy used in our work) could eliminate the negative effect of toxic irradiation-derived compounds on SSF for ethanol bioconversion with the yield value of 67%. Analyses of SEM, FT-IR, reducing sugar and bioethanol yield showed that the efficiency of pretreatment on MCC was ILs≈irradiation pretreatment>AA-ILs pretreatment>1% HCl pretreatment>1% H<SUB>2</SUB>SO<SUB>4</SUB> pretreatment.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Effects of pretreatments followed with SSF on MCC for bioethanol was evaluated. </LI> <LI> The appropriate irradiation dose pretreatment on MCC enhanced ethanol bioconversion. </LI> <LI> The structure of MCC after treatment with different pretreatments is characterized. </LI> <LI> The relationship of yeast growth and ethanol yield during SSF was firstly elucidated. </LI> </UL> </P>