Noncellulosic compounds

In bleaching fiber is usually treated with sodium chlorite and links are developed between lignin and carbohydrates. Removal of noncellulosic compounds by chemical treatments resulted in improvement of mechanical and physical characteristics as well as of fiber strength [33]. 

Differences in the structure of cell walls of various plants and their parts are related to the differentiation of the primary cells, cellulose crystalinity and the type and amount of non-cellulose polysaccharides. Deposition of additional layers of cellulose (in the form of clearly oriented parallel microfibrils), deposition of noncellulose polysaccharides and lignification of the polysaccharide network, which is due to polymerisation of phenolic compounds, results in the formation of thick secondary cell walls, which have various special functions. For example, they ensure the rigidity of tissues, transport of water and have protective and other functions. 

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