Physical Properties
Xanthan gum is a white to pale yellow powder that is readily soluble in water, forming a viscous solution. Its aqueous solutions exhibit exceptionally high viscosity and can form stable colloidal systems even at low concentrations. The solutions behave as non-Newtonian fluids; their viscosity varies with shear rate-meaning that fluidity increases during stirring or shaking, yet a certain consistency is maintained when the solution is left to stand.
Chemical Properties
The molecular chains of xanthan gum contain active functional groups, such as carboxyl and hydroxyl groups; consequently, it demonstrates a certain degree of tolerance toward acids, bases, and salts. It remains stable in neutral or weakly alkaline environments but may undergo partial degradation under strongly acidic or strongly alkaline conditions. It exhibits good stability against heat and enzymatic activity, retaining its functional properties within a specific temperature range.
Rheological Properties
Xanthan gum solutions exhibit shear-thinning behavior-specifically, their viscosity decreases during stirring or pumping. This characteristic is of critical importance in applications involving food products, cosmetics, and petroleum drilling fluids. It enhances the suspension properties of liquids, preventing the sedimentation of solid particles, while simultaneously imparting appropriate texture or flow characteristics to the final product.
Additional Properties
Xanthan gum is capable of forming complexes with various ions and polysaccharides, thereby enhancing the stability of solutions. Furthermore, it possesses excellent emulsifying and gelling capabilities, allowing for the precise control of the structure and texture of food products and chemical formulations.
