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Polysaccharides Polysaccharides form a heterogenous group of polymers of different length and composition. They are comprised of many monosaccharide residue that are linked by glycosidic bonds, They are therefore very large, often branched, molecules. Polysaccharides have the general formula: -[Cx(H2O)y)]n- where y is generally = x - 1. It has already been shown that: ? Both alpha and beta glycosidic linkages exist. ? These linkages may be loacated between the C1 (or C2) of one sugar residue and the C2, C3, C4, C5 or C6 of the second residue. A branched sugar results if more than two types of linkage are present in single molecule. ? A polysaccharide may consist of one (homopolymer) or several types of monomers (heteropolymer). construction principles would allow an indefinite number of different polysaccharides. But only a fraction of these are actually found in nature, since only certain combinations won through in the course of evolution. The flexibility of polysaccharide chains depends on...

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