Carrageenans interactions with galactomannans

As with agar and carrageenan, substitution in the Xanthomonas polysaccharide structure inhibits the interaction with galactomannan. Thus, removal of the acetyl groups by saponification yields a product that interacts much better with galactomannans.211 Less locust-bean gum is required to gel deacetylated Xanthomonas polysaccharide, and mixtures of locust-bean gum and deacetylated Xanthomonas polysaccharide form a gel at lower, total-polysaccharide concentrations. 

V. Interaction of Galactomannans with Carrageenan, Agar, and Other Polysaccharides. 284... 

In combination with galactomannans, x-carrageenan shows an unusual synergism, which is marked by an enhancement of the gel strength. This phenomenon is believed to be due to a carrageenan-galactomannan interaction. 

Fig. 4. —Model Proposed for the Interaction Between Chains of K-Carrageenan and the regions of Galactomannan Sparsely Substituted with D-Galactosyl Groups.

The linear chain polymer forms extremely high-viscosity aqueous solution. Forms a gel that is elastic and thermally nonreversible under existence of alkali. The gel strength multiplies with the simultaneous use of xanthan gum and carrageenan. The interaction between arum root mannan and xanthan is stronger than the interaction between xanthan and galactomannan. 

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