Guar gum

Hydrates rapidly in cold-water systems to give highly viscous colloidal thixotropic dispersion [8]. Complete hydration typically occurs in about 30 minutes, depending on preparation [8].

Maximum viscousity is achieved at 25-40 °C. Viscosity is not affected by pH in pH 1.0-10.5. This is believed to be because of the nonionic uncharged nature of the molecule. Hydration rate is however. Maximum hydration rate is at pH 8-9, while the slowest hydration rate is pH >10 and <4. since guar gum is nonionic, it is not sususceptible to salting out. the stability of guar gum solution is good with mono-,di-, and trivalent ions (both cations and anions), and the viscousity increases with increasing concentrations of salt. the viscosity decreases with inceasing concentrations of sugar. sugar protects guar gum from hydrolysis and loss of viscousity [1].

Guar is stable at pH 10-12. At pH 1-2, guar depolymerizes in a short period of time [8].