What is lignocellulose?

Lignocellulosic is an abundant and renewable resource from plants mainly composed of polysaccharides (cellulose and hemicelluloses) and an aromatic polymer (lignin). Lignocellulose is the main component and supporting tissue of plant cell wall, which is widely distributed in crop residues such as corn stover, wheat straw, wood chips, dead branches, fallen leaves and grasses

The main component of lignocellulose is cellulose, a β (1–4)-linked chain of glucose molecules and it accounts for 30–50 % of the dry weight of lignocellulose. Cellulose is a polymer of glucose. This sugar can be extracted and it can be fermented to make ethanol or the longer-chain alcohol butanol.

Lignin binds to cellulose fibres to harden and strengthen the plant cell walls. Hydrogen bonds between different layers of the polysaccharides contribute to the resistance of crystalline cellulose to degradation.

Hemicellulose, the second most abundant component of lignocellulose, is composed of various 5- and 6-carbon sugars such as arabinose, galactose, glucose, mannose and xylose. Lignocellulose-degrading enzymes, namely, cellulases, hemicellulases, and ligninases, play a crucial role in converting lignocellulose into sugars and biofuels.

The lignocellulose structure varies between different biomass types, i.e., corn stalks, timber, plant stems, and waste paper, so degradability of biomasses with similar lignocellulose concentration may, therefore, vary according to the structure of lignin.

Lignocellulose is abundant, inexpensive, and renewable. Further, it can replace fossil fuels as primary source to produce second-generation biofuels and bio-sourced chemicals and materials without compromising global food security.
What is lignocellulose?

The polymer of hemicellulose

Hemicelluloses are the plant polymers that are the main components of cell walls. It contents were estimated as the sums of the nonglucan anhydro-sugars in the straw including the xylan, galactan, arabinan and mannan, measured in te compositional analyses.

Hemicelluloses are highly branched because of the bonds that form among the sugars that make them up, and they form a network that coats the much larger cellulose microfibrils.

Both cellulose and hemicellulose function as a supporting material in the cell walls. Hemicellulose is the main constituent of cereal fibers.

Hemicellulose is important for its ability to absorb water. Bacteria can break down hemicellulose to allow some absorption by the human body.

Hemicellulose promotes peristalsis of the bowel and prevents constipation.

Most hemicelluloses are found in interspersed within or in the boundaries of the amorphous regions of the cellulose chains and in close association within lignin. Hemicellulose may be the connecting material between cellulose and lignin.

Foods that are relatively high in hemicellulose include bran and whole grains as well as nuts, legumes, and some vegetables and fruits.
The polymer of hemicellulose