Rheology of Xanthan Gum

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Abstract
Rheology of aqueous solutions of xanthan gum [of Xanthomonas campestris] was studied over a wide range of shear rate and concentration. At sufficient dilution and low shear rates xanthan solutions show a region of Newtonian viscosity behavior. More concentrated solutions appear to show a yield stress. Preliminary normal stress data and effects of salt concentration are discussed in terms of the structure of this polysaccharide in solution. Intrinsic viscosity data are modeled as a suspension of rods and they agree with existing theory. The conformation of xanthan in solution is probably rodlike, having some flexibility. A hydrodynamic length near 1.5 .mu.m is estimated, assuming a diameter of 19 .ANG.

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