Polysaccharides galactomannan-related, structure

The interaction with polysaccharides closely related structurally to galactomannans has been studied less for Xanthomonas polysaccharide than for agar. No interaction is observed between Xanthomonas polysaccharide and sodium O-(carboxymethyl)-cellulose (degree of substitution 0.7), probably because of electrostatic repulsion between the two negatively charged polysaccharides.178 Xanthomonas polysaccharide can, however, interact with polysaccharides based on /3-l>(l — 4)-linked D-glucan backbones, as... 

In describing and interpreting some of the more important properties of plant galactomannans, comparisons will be made with structurally similar polysaccharides, including the closely related glucomannans and galactoglucomannans, and those based on (1 — 4)-/3-D-xylan main-chains (for example, the arabinoxylans) and (1 — 4)-/3-D-glucan main-chains [for example, the amyloids and sodium 0-(carboxymethyl)cellulose]. 

Quaternary structure formation may also involve association of ordered conformations of unlike polysaccharides. The most fully characterised mixed junctions are those of agarose, carrageenan and xanthan helices with unsubstituted backbone regions of galactomannans and related type A polysaccharides (24). 

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