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<p>Despite important advancements in recent years, the use of lignocellulosic biomass in biorefineries remains rather difficult due to the low selectivity of conventional fractionation methods. New or improved technologies that can selectively target specific fraction while preserving the integrity of both polysaccharides and lignin are of utmost importance for expanding the variety of bio-based products and making biomass valorization more efficient. This study showed that short-term microwave-assisted alkaline H<sub>2</sub>O<sub>2</sub> treatment of corncob can selectively remove lignin and improve the hydrolysis efficiency of polysaccharide fractions allowing for higher sugar recovery. A delignification of 75% and an increase of cellulose content and surface area by 57% and 76%, respectively, were achieved by applying a 1-minute treatment under optimized conditions. The treatment considerably improved the adsorption capacity and hydrolysis efficiency of corncob, resulting in a yield of hexose and pentose sugars of 61.18% and 60.24%, which was 2.7-fold and 5.6-fold higher, respectively, compared with untreated biomass. XRD and FTIR analyses confirmed significant structural and compositional alterations in treated corncob caused by treatment. The purity and yield of recovered lignin suggest the potential integration of lignin extraction into corncob biorefinery, which can increase the overall efficiency of corncob processing while contributing to the circularity and sustainability of the food system.</p>

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Short-Term Microwave-Assisted Peroxide Treatment for Intensified Lignin and Sugar Recovery from Corncob

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • Dragana Mladenović,
  • Aleksandra Djukić-Vuković,
  • Ljiljana Veselinović,
  • Dušan Mijin,
  • Sunčica Kocić-Tanackov,
  • Ljiljana Mojović

摘要

Despite important advancements in recent years, the use of lignocellulosic biomass in biorefineries remains rather difficult due to the low selectivity of conventional fractionation methods. New or improved technologies that can selectively target specific fraction while preserving the integrity of both polysaccharides and lignin are of utmost importance for expanding the variety of bio-based products and making biomass valorization more efficient. This study showed that short-term microwave-assisted alkaline H2O2 treatment of corncob can selectively remove lignin and improve the hydrolysis efficiency of polysaccharide fractions allowing for higher sugar recovery. A delignification of 75% and an increase of cellulose content and surface area by 57% and 76%, respectively, were achieved by applying a 1-minute treatment under optimized conditions. The treatment considerably improved the adsorption capacity and hydrolysis efficiency of corncob, resulting in a yield of hexose and pentose sugars of 61.18% and 60.24%, which was 2.7-fold and 5.6-fold higher, respectively, compared with untreated biomass. XRD and FTIR analyses confirmed significant structural and compositional alterations in treated corncob caused by treatment. The purity and yield of recovered lignin suggest the potential integration of lignin extraction into corncob biorefinery, which can increase the overall efficiency of corncob processing while contributing to the circularity and sustainability of the food system.