Polysaccharides xyloglucan group

Similar structural problems exist for the distribution of side chains in galactoglucomannans, xyloglucans, arabinoxylans, and 4-0-methylglucuronoxylans, and even for the distribution of acetyl groups in glucomannans and for related features in many other polysaccharides. 

Natural polymers have also been used as thermo-sensitive hydrogels, either on their own or in combination with other synthetic polymers. Popular natural polymers include chitosan, cellulose derivatives, dextran, xyloglucan and gelatin (Klouda and Mikos 2008). Chitosan is a polysaccharide derived from the shells of crustaceans and is produced by deacetylation of chitin, basically through the removal of the acetyl group using a concentrated NaOH solution (Fig. 11.5). The main advantage of chitosan for medical and pharmaceutical applications is its biocompatibility and inertness when in contact with human cells (Kumar et al. 

The hemicelluloses are a heterogeneous group of polysaccharides that vary from plant to plant and from one plant part to another. There are four basic types of hemicellulose polysaccharides D-xyloglucans, composed of D-xylopyranose attached to a cellulose chain D-xylans, composed of D-xylose D-mannans, composed of D-mannose and D-galactans, composed of D-galactose. These polysaccharides are similar to cellulose in having their main chains linked p-1 -> 4. Most of the hemicelluloses are, however, heteropolysaccharides with one to three monosaccharides units linked to the main monosaccharide chains. 

Hemicellulases are groups of enz5mies belonging to glycosidases families, whose common feature is hydrolysis of hemicellulose. This polysaccharide has a complex structure consisting of linear and branched chains made up of xylane, arabinoxylan, xyloglucan. 

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