Antunes et al. [10] reported that viscosity was the most
important property to be considered in the industrial appli-
cation of xanthan gum.
The viscosity behaviors of the xanthan gums produced
by the three strains of X. campestris, evaluated in the range
from 25 to 85∘
C using a Haake Rheotest viscometer with a
concentric cylinder device, were similar, the values decreas-
ing with increasing temperature (Figure 4).This behavior was
associated with changes in the conformation of the xanthan
molecules as observed by Bradshaw et al. [26]. It was found
that in the temperature range from 25 to 85∘
C, the viscosity
values ranged from 80.74 to 90.36 mPa⋅s (gums from sucrose)
and from 85.59 to 99.96 mPa⋅s (gums from SSAE) (Figure 4).
One important property of xanthan gums is the ability to
modify the rheological behavior of solutions. The rheological
properties of xanthan gums are mainly related to the chemical
composition, arrangement and/or molecular bonding, molar
mass, and strain used in the bioconversion [27].
Figure 5 shows the effect of shear rate on the viscosity
of the xanthan gums obtained from sucrose and from SSAE,
according to the kinetic model (