Enzymatic Conversion of Lignocellulosic Biomass
Summary
Lignocellulosic biomass, derived from agricultural residues, forestry by-products and dedicated energy crops, represents an abundant renewable resource for the sustainable production of biofuels and biochemicals. Its primary constituents—cellulose, hemicellulose and lignin—form a highly ordered composite that resists enzymatic attack, a trait commonly referred to as recalcitrance. Effective conversion relies on a two-stage process: a physicochemical pretreatment that disrupts the lignin–carbohydrate matrix and increases substrate accessibility, followed by hydrolysis with bespoke enzyme cocktails. These cocktails typically combine core cellulases, hemicellulases and accessory proteins or auxiliary oxidative enzymes to achieve synergistic depolymerisation of polysaccharide chains. Advances in enzyme engineering, formulation and process integration have progressively lowered protein loadings and enhanced sugar yields, thereby improving the economic viability of second-generation biorefineries. The global significance of this research lies in its potential to replace fossil-derived chemicals with low-carbon alternatives, reduce waste streams and valorise underutilised biomass in circular bioeconomy models.
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Enzymatic Conversion of Lignocellulosic Biomass publication trend
The graph below shows the total number of articles in enzymatic conversion of lignocellulosic 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 forms the structural framework of cell walls.
Cellulase: A suite of enzymes (including endoglucanases, cellobiohydrolases and β-glucosidases) that collectively hydrolyse cellulose into fermentable sugars.
Hemicellulase: Enzymes that target the heterogeneous hemicellulose fraction, such as xylanases and arabinofuranosidases, to liberate pentose and hexose sugars.
Pretreatment: A physicochemical process that disrupts biomass structure, enhances enzyme accessibility and reduces recalcitrance.
Nonproductive binding: The irreversible adsorption of hydrolytic enzymes onto lignin or other non-cellulosic components, reducing catalytic efficiency.
References
- Promoting enzymatic hydrolysis of lignocellulosic biomass by inexpensive soy protein. Biotechnology for Biofuels and Bioproducts (2019).
- Effects of lignin and surfactant on adsorption and hydrolysis of cellulases on cellulose. Biotechnology for Biofuels and Bioproducts (2016).
- Enzymatic lignocellulose hydrolysis: Improved cellulase productivity by insoluble solids recycling. Biotechnology for Biofuels and Bioproducts (2013).
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