Rheological characterization of xanthan-guar mixtures in dilute solutions

摘要: ABSTRACT Dynamic viscoelastic and intrinsic viscosity properties of native xanthan, deacetylated guar, their mixtures in dilute solutions were investigated by using an oscillating capillary rheometer. Influence mixing temperature, deacetylation, salt concentration on xanthan conformation interaction with guar studied order to provide additional evidence that can be used elucidate the mechanism intermolecular between two biopolymers, build up a more detailed rheological understanding molecular interactions gum solutions. Synergistic was found at temperatures 25 80 °C, but stronger synergistic observed temperature °C. The differences elasticity measurements could attributed degree disordering xanthan. For both temperatures, relative blends higher than calculated for assuming no interaction, indicating binding occurred galactomannans backbone disordered segments Deacetylated exhibited viscosities xanthan-guar those from weight averages individually, whereas lower demonstrating gum. regime water 2 mM NaCl not 40