Biotechnological Production of Xylitol from Lignocellulosic Biomass

Lignocellulosic biomass, comprising agricultural residues, forestry wastes and dedicated energy crops, represents a sustainable feedstock for the biotechnological production of xylitol. Hemicellulose fractionation releases pentose sugars, predominantly xylose, which can be converted into xylitol through microbial or enzymatic biotransformation. Key steps include pretreatment to disrupt the lignin–carbohydrate complex, enzymatic or chemical hydrolysis of hemicellulose, detoxification of inhibitory compounds (such as furfural and hydroxymethylfurfural), and fermentation by specialist yeasts or engineered bacterial strains. Advances in metabolic engineering have enhanced xylose uptake, improved cofactor regeneration and increased tolerance to inhibitors. Fed-batch and continuous processes, sometimes in conjunction with immobilised biocatalysts, deliver high titers and yields. Emerging strategies embrace consolidated bioprocessing in which a single organism produces both hydrolytic enzymes and xylitol, streamlining operations. Downstream recovery employs membrane separation and crystallisation to achieve food-grade purity. As a low-calorie sugar alcohol with dental health benefits and platform-chemical potential, biotechnological xylitol supports circular bioeconomy goals by valorising waste streams and reducing reliance on petrochemical hydrogenation routes.

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Biotechnological Production of Xylitol from Lignocellulosic Biomass publication trend

The graph below shows the total number of articles in biotechnological production of xylitol from lignocellulosic biomass across all publications each year (not limited to Nature Index journals).

Technical terms

Lignocellulosic biomass: plant matter consisting of cellulose, hemicellulose and lignin, used as a renewable feedstock.

Hemicellulose: a heterogeneous polysaccharide fraction of plant cell walls rich in pentose sugars.

Xylose reductase: an enzyme that converts xylose to xylitol, often requiring NAD(P)H cofactor.

Detoxification: removal or biotransformation of fermentation inhibitors such as furfural and hydroxymethylfurfural.

Fed-batch fermentation: a cultivation mode where substrates are added incrementally to control nutrient supply and product formation.

Consolidated bioprocessing (CBP): integration of enzyme production, biomass hydrolysis and fermentation in a single microbial culture.

References

1. Xylitol: Bioproduction and Applications-A Review. Frontiers in Sustainability (2022).
2. Biological and Pharmacological Potential of Xylitol: A Molecular Insight of Unique Metabolism. Foods (2020).
3. High level xylitol production by Pichia fermentans using non-detoxified xylose-rich sugarcane bagasse and olive pits hydrolysates. Bioresource Technology (2021).
4. Biovalorisation of crude glycerol and xylose into xylitol by oleaginous yeast Yarrowia lipolytica. Microbial Cell Factories (2020).
5. Scaling up xylitol bioproduction: Challenges to achieve a profitable bioprocess. Renewable and Sustainable Energy Reviews (2022).