초록
<P><B>Abstract</B></P> <P>To enhance the enzymatic digestibility of cashew apple bagasse (CAB) feedstock in order to produce sugar fermentation-derived bioproducts, the CAB was subjected to three different pretreatments with the ionic liquid 2-hydroxyl-ethylammonium acetate (2-HEAA) and characterized by FTIR, NMR and chemical methods. All conditions were able to delignify CAB, however the best lignin removal (95.8%) was achieved through the method performed with 8.7% w/w of CAB/2-HEAA ratio at 130°C for 24h. Although the cellulose crystallinity has been increased in CAB treated with the ionic liquid, but this fact did not influence its digestibility. Nevertheless, the pretreatment with 2-HEAA enhanced significantly the cellulose digestibility, increasing the glucose yield from 48 to 747.72mg<SUB>glucose</SUB>/g<SUB>CAB</SUB>. Furthermore, 2-HEAA pretreatment was efficient even with reused ionic liquid, obtaining high glucose concentration<I>.</I> </P> <P><B>Highlights</B></P> <P> <UL> <LI> Synthesis and characterization of the protic ionic liquid 2-HEAA. </LI> <LI> Different pretreatments using 2-HEAA was studied over cashew apple bagasse. </LI> <LI> 2-HEAA removed lignin from untreated cashew apple bagasse. </LI> <LI> IL-pretreated cashew apple bagasse exhibited higher cellulose crystallinity. </LI> <LI> Enzymatic hydrolysis from CAB pretreated with IL produce a high sugar yield. </LI> </UL> </P>