Ethanol Production from Agricultural Biomass
Summary
Ethanol from agricultural biomass harnesses fermentable sugars and starches sourced from dedicated crops and by-products such as sugarcane bagasse, corn stover, wheat straw and distillers’ grains. Production entails pretreatment to disrupt the protective lignin–hemicellulose matrix, enzymatic saccharification to liberate monosaccharides, microbial fermentation to convert sugars into ethanol and downstream recovery by distillation. First-generation processes exploit sucrose or starch feedstocks, while second-generation approaches focus on lignocellulosic residues to improve sustainability and avoid competition with food supply. Key advances include tailored enzyme cocktails, engineered microbial strains for pentose and hexose utilisation, high-solid fermentations to boost concentrations and integrated biorefinery designs that valorise co-products such as lignin for heat and power or lipids for biodiesel. These developments address recalcitrance, reduce greenhouse gas emissions and seek to lower production costs, although challenges in inhibitor management, process scale-up and economic viability persist.
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Ethanol Production from Agricultural Biomass publication trend
The graph below shows the total number of articles in ethanol production from agricultural biomass across all publications each year (not limited to Nature Index journals).
Technical terms
Lignocellulosic biomass: Plant-derived material composed of cellulose, hemicellulose and lignin that requires pretreatment to access fermentable sugars.
Pretreatment: Physical, chemical or biological process that disrupts biomass structure and enhances enzyme accessibility.
Saccharification: Enzymatic hydrolysis converting polysaccharides into monosaccharides such as glucose and xylose.
High-solid loading: Fermentation strategy using elevated biomass concentrations to increase product titre and reduce water usage.
Hydrothermal pretreatment: Use of high-temperature water to solubilise hemicellulose and improve digestibility without added chemicals.
Microbial fermentation: Bioconversion step wherein yeasts or bacteria metabolise sugars to ethanol under anaerobic conditions.
References
- Economic Analysis of Cellulosic Ethanol Production from Sugarcane Bagasse Using a Sequential Deacetylation, Hot Water and Disk-Refining Pretreatment. Processes (2019).
- Dry-grind processing using amylase corn and superior yeast to reduce the exogenous enzyme requirements in bioethanol production. Biotechnology for Biofuels and Bioproducts (2016).
- Evaluation of the quantity and composition of sugars and lipid in the juice and bagasse of lipid producing sugarcane. Biocatalysis and Agricultural Biotechnology (2017).
- Optimizing Chemical-Free Pretreatment for Maximizing Oil/Lipid Recovery From Transgenic Bioenergy Crops and Its Rapid Analysis Using Time Domain-NMR. Frontiers in Energy Research (2022).
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