초록
<P><B>Abstract</B></P> <P>To enhance the cellulose digestibility of energy grass hybrid <I>Pennisetum</I> (<I>P. americanum</I> × <I>P. purpureum</I>, HP) with low energy-consumption and high efficiency, a novel combinatorial pretreatment of oxygen-aqueous alkaline ionic liquid (IL) 1-ethyl-3-methylimidazolium acetate ([Emim]Ac) media (OEA) was developed in this work. The combinatorial pretreatment was performed under the relatively low temperature (120°C), short retention time (30min), and 12bar oxygen pressure. The combinatorial pretreatment of OEA was demonstrated effectively for pretreatment of hybrid <I>Pennisetum</I>, which evidenced by the removal of lignin, degradation of carbohydrate, and porosity property of the regenerated biomass. Subsequently, a higher glucose recovery (96.9%) at a low enzyme loading (20FPU/g substrate) was obtained by the OEA pretreatment, and it was 9.1 times as much as the untreated samples. Overall, the novel OEA combinatorial pretreatment has the advantages of low thermal energy input and enzyme usage, and short retention time.</P> <P><B>Highlights</B></P> <P> <UL> <LI> An efficient oxygen-aqueous alkaline [Emim]Ac media pretreatment was developed. </LI> <LI> The higher sugar recovery was achieved with 120°C for 30min retention time. </LI> <LI> Marked delignification by OEA pretreatment were caused by oxygen. </LI> <LI> High glucose recovery (96.7%) was obtained at a low enzyme loading. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>