Some observations were made about the effect of metal salts on the gel-formation of alginate and lignosulfonate solutions.
When the concentration solutions of calcium and sodium-lignosulfonate were converted to the each gel solution by reacting with K
2Cr
2O
7, under an acetic acid-acidified condition, the rotational viscosity and the structrual viscosity value (n-value) of the lignosulfonate solutions increased rapidly, as well as the gel-formation of a sodium alginate solution with calcium chloride. The change of the rotational viscosity of an alginate-calcium chloride gel or lignosulfonate gel solution by heating or cooling in the range of 5°C to 93°C was inreversible. From the above results, it was difficult to find out the difference of the static viscosity between the solutions of ionic gel of alginate and lignosulfonate gel.
The viscoelasticity of the “Tororo-aoi” mucin and the above two gel solutions was measured by a hysteresis loop method. The results indicated that the mucin and lignosulfonate gel solutions have linear viscoelasticity, while an ionic gel solution of alginate having non-linear viscoelasticity.
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