ABSTRACT
The term "hemicellulose" was first introduced by Schulze in 1891 to describe the fractions isolated or extracted from plant materials with dilute alkali. Diverse polysaccharides are present in the majority of cell walls, the specific makeup varying in different species and tissues. The plant cell wall can usually be grouped into cellulose, hemicelluloses, and proteins, and in some cells of terrestrial plants, the cell wall is surrounded by phenolic compounds. The majority of the polysaccharides in the plant resources are the cellulose, hemicellulose, and pectin classes. Xyloglucan is abundant in primary walls of higher plants except for grasses, responsible for bounding cellulose, which is usually found in the middle lamella, primary walls, and gelatinous wall layer of higher plants. The polysaccharides in lignocellulosic biomass containing mannose are also widely distributed and act as the main hemicellulose in charophytes. Hemicellulose is a heteropolymer and is characterized by a random, amorphous, and complex structure with little strength.
