Integrated twin-screw extrusion and organosolv pretreatment efficiently enhances cellulose-to-glucose conversion and lignin recovery from corn cobs
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Biomass and Bioenergy
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Efficient conversion of lignocellulosic biomass into bioproducts depends on optimized pretreatment strategies that enhance the accessibility of structural macromolecules. However, individual methods often face limitations regarding cellulose-to-glucose conversion and lignin recovery. This study evaluated an integrated approach combining twin-screw extrusion, organosolv fractionation, and enzymatic hydrolysis using corn cobs as feedstock. A factorial design applied to the extrusion process identified optimal conditions (144 °C, 11 rpm), resulting in a cellulose-to-glucose conversion of 92.6 wt% after enzymatic hydrolysis. In the subsequent organosolv step, treatment time was the most influential factor for improving cellulose digestibility. A second factorial design identified optimal conditions (60 min, 20.1 wt% solids), yielding the highest glucose conversion (93.0 ± 1.2 wt%) and enabling recovery of 45.4% of the solubilized lignin. Additionally, increasing solids loading from 10 to 15 wt% during enzymatic hydrolysis improved glucose productivity by 23.7%. These findings demonstrate that integrating twin-screw extrusion and organosolv pretreatment effectively enhances sustainable valorization of corn cobs.