Grafted polysaccharides

The modification of polysaccharides is needed to improve the properties of these polysaccharides. Grafting is one of the best methods for the modification of polysaccharides. Graft copolymerization is a process in which side chain grafts are covalently attached 

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Fig. 5 Synthesis of polylactide-grafted polysaccharide (Dex-g-PLA) by trimethylsilyl-protection method...

Maruyama, A, Ishihara, T., Kim, J.S., Kim, S.W. and Akaike, T. (1997) Nanoparticle DNA carrier with poly(L-lysine) grafted polysaccharide copolymer and poly(D,L-lactic acid). Bioconjug. Chem., 8, 735-742. 

It is well known that glycosylated proteins are very stable, therefore grafting polysaccharides or short chains of sugar molecules onto proteins has been used to improve enzyme stability. (6,7,8)... 

Grafted Polysaccharides Smart Materials of the Future, Their Synthesis and Applications... 

Any occluded homopolymer formed by competing homopolymer formation reaction should be removed from the grafted polysacharide synthesized by solvent extraction in a suitable solvent where only the homopolymer is highly soluble. In the case of polyacrylamide grafted polysaccharides, a mixture of formamide and acetic acid (1 1 by volume) is used [48,49, 51]. 

The FTIR spectroscopy of grafted polysaccharides reveals the presence of specific peaks associated with the vibration of a functional group present in the graft polymer chain but not in the polysaccharide. The presence of these specific peaks confirms the grafting reaction. 

The FTIR spectrum of polysaccharide, modified polysaccharide and grafted polysaccharide are explained as below ... 

The grafting of polysaccharides results in a profound change in morphology. The morphology of grafted polysaccharides are generally fibular, i.e. consisting of fiber- like structures. 

Singh s easy approachability model [60-65] explains the superiority of grafted polysaccharides over other types of flocculants. This model states that the dangling branches of polyacrylamide or cationic moiety have easy approach-ability when they are grafted onto the rigid polysaccharide backbone. 

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