Pretreatment of Sugarcane Postharvest Leaves by Γ-Valerolactone/water/fecl3 System for Enhanced Glucan and Bioethanol Production
Industrial crops and products(2023)
Abstract
The potential of sugarcane postharvest leaves for fermentable sugar yield and bioethanol production was analyzed using FeCl3 catalyzed gamma-valerolactone/water pretreatment in the present study. Widely cultivated Indian cane variety Co 86032 (Nayana) was selected for the analysis. Cellulose (52.7 +/- 5%), hemicellulose (33.9 +/- 3.5%) and lignin (18 +/- 0.3%) were estimated in postharvest leaves. Optimized GVL/water/FeCl3 pretreatment (70% GVL/300 mM FeCl3 in 30% water at 120 degrees C for 3 h) resulted in high delignification (74%) and hemicellulose dissolution (85.6%). Extensive removal of ester-linked ferulic acid (94.2%) and p-coumaric acid (84.4%) was also observed after pretreatment. The pretreatment-induced changes were visualized through FESEM, FTIR, XRD and confocal imaging. Only trace amounts of furfural and HMF were detected in the pretreated slurry. At 96 h of saccharification, 82.5% glucose was yielded. Fermentation of enzymatic hydrolyzate using S. cerevisiae MTCC-36 resulted in ethanol yield of 0.434 g/g glucose at 21 h. Current study revealed that, FeCl3 catalyzed GVL/water pretreatment causes effective deconstruction of cane leaves for bioethanol production.
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Key words
Agricultural residues,Sugarcane postharvest leaves,-valerolactone,water,FeCl3 pretreatment,Bioethanol,Fermentable sugar recovery,Biomass recalcitrance
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