Notes :

Guar gum, also called guaran, is a galactomannan. It is a polysaccharide composed of the sugars galactose and mannose. The backbone is a linear chain of b 1,4-linked mannose residues to which galactose residues are 1,6-linked at every second mannose, forming short side-branches.

In water, it is nonionic and hydrocolloidal. It is not affected by ionic strength or pH, but will degrade at extremes pH and temperature (e.g. pH 3 at 50 °C). It remains stable in solution over pH range 5-7. Strong acids cause hydrolysis and loss of viscosity, and alkalies in strong concentration also tend to reduce viscosity. It is insoluble in most hydrocarbon solvents.

Guar gum retards ice crystal growth nonspecifically by slowing mass transfer across the solid/liquid interface. It shows good stability during freeze-thaw cycles.

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