Dynamic mechanical properties of aqueous gellan solutions in the sol-gel transition region

Influence of the gelation of aqueous gellan solutions on the dynamic viscoelastic behavior was investigated. Dynamic shear moduli for aqueous gellan solutions (0.60-3.0wt%) were determined over the frequency range from 0.01 to 10Hz and the temperature range from 10 to 60 °C by the method of annular...

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Bibliographic Details
Published in:Carbohydrate polymers 1996, Vol.30 (2), p.101-108
Main Authors: Nakamura, Kunio, Tanaka, Yutaka, Sakurai, Masao
Format: Article
Language:English
Subjects:
Applied sciences
Biological and medical sciences
Exact sciences and technology
Food additives
Food industries
Fundamental and applied biological sciences. Psychology
General aspects
Natural polymers
Physicochemistry of polymers
Starch and polysaccharides
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Summary:Influence of the gelation of aqueous gellan solutions on the dynamic viscoelastic behavior was investigated. Dynamic shear moduli for aqueous gellan solutions (0.60-3.0wt%) were determined over the frequency range from 0.01 to 10Hz and the temperature range from 10 to 60 °C by the method of annular pumping between coaxial cylinders. Cole-Cole diagrams in the complex viscosity were constructed, considering temperature and frequency as variables. The complex viscosity was characterized by the circular arc in the viscoelastic gel region and by the skewed circular arc in the sol region. The change in the relaxation from circular arc to skewed circular arc caused by gelation was interpreted in terms of the change in the frequency dependency from the Cole-Cole type to the Williams-Watts type.
ISSN:0144-8617
1879-1344
DOI:10.1016/S0144-8617(96)00081-1