Chemistry Reference
In-Depth Information
1800
R2 = 0.2
1600
1400
1200
0
20
40
60
80
Viscosity at 0.01 per second (Pa
.
s)
Fig. 5.20
Correlation between Xanthan FCC viscosity (1% gum in 1% KCl) and low
shear viscosity of 0.3% xanthan gum in 1% NaCl.
performance in the application and no opportunity for the manufacturers
to differentiate on one of the main functional properties of xanthan gum.
Recently, a new approach to the specification of xanthan gum has
been taken by Danisco with the introduction of a xanthan gum range
with application-related specifications linked to key functionalities such
as low shear viscosity and synergistic interaction with galactomannans.
This approach provides for the first time a range differentiated on these
properties (see Fig. 5.21a and b) and specifications that provide the end
user with a guarantee of consistent performance. In addition, focus on
1600
1 000 000
1400
100 000
1200
1000
10 000
800
1000
600
400
100
200
10
0
0.001
0.01
0.1
1
10
100
Shear rate (per second)
Xanthan/LBG ratio
(b)
(a)
Fig. 5.21
(a) Differentiation of xanthan gum based on the rheological profile at 0.3%
gum in 1% NaCl. GRINDSTED
Xanthan SAV-SH (•), GRINDSTED
Xanthan 80 (◦)and
R
R
GRINDSTED
R
). (b) Differentiation of xanthan gum based on
the synergistic interaction with lbg at 1% 60:40 xanthan:LBG in 1% NaCl. GRINDSTED
R
Xanthan SAV-SH SOFT (
Xanthan 80 (
Xanthan SAV-SH
), GRINDSTED
R
) and GRINDSTED
R
Xanthan SAV-SH (
•
◦
SOFT (
).
