Structural features of polysaccharide
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Answer:
these are formed by the same basic process monosaccharide connected via glycocidis bonds
On the basis of crystalline density, a putative number of water molecules is assumed, in agreement with the space group symmetry. Several strategies can be used in the location of these crystalline water molecules.127 In the final stages of the refinement, the water molecules are introduced and the structure is minimized according to the general scheme for defining and refining polysaccharide structures. Even when an unequivocal crystal structure is established for a polysaccharide, the hydrogen bonding and the subsequent characterization of the hydration are likely to remain ambiguous, in the absence of direct evidence relating the orientation of the hydroxyl groups. Therefore, hydrogen bonds are identified by the O…O separation. It is a reasonable assumption from monosaccharide and oligosaccharide crystal structures that all hydrogen-bonding donor functional groups will form hydrogen bonds. It is also desirable, albeit not necessary, that all potential hydrogen-bond acceptor atoms be acceptors. Most of these features are derived from some carbohydrate crystal structural studies. However, as the molecules become larger, the hydration number increases as does the complexity.128 It has to be stated that characterizing water–polysaccharide interactions is very much hampered by the absence of information about the hydrogen atoms and is likely to remain speculative.