Influence of temperature on the rheological behavior of a new fucose-containing bacterial exopolysaccharide

The effect of temperature on the rheology of a new fucose-containing extracellular polysaccharide (EPS) was evaluated. The steady state data revealed a shear-thinning behavior, with the viscosity being immediately recovered when the shear rate was decreased. The mechanical spectra indicated viscous...

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Bibliographic Details
Published in:International journal of biological macromolecules 2011-05, Vol.48 (4), p.695-699
Main Authors: Cruz, Madalena, Freitas, Filomena, Torres, Cristiana A.V., Reis, Maria A.M., Alves, Vítor D.
Format: Article
Language:English
Subjects:
aqueous solutions
Bacteria
cooling
Enterobacter - chemistry
Enterobacter sp
exopolysaccharides
Fucose - chemistry
heat
Microbial polysaccharide
polymers
Polysaccharides, Bacterial - analysis
Polysaccharides, Bacterial - chemistry
Rheology
Shear Strength
Temperature
thermal stability
viscoelasticity
Viscosity
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Summary:The effect of temperature on the rheology of a new fucose-containing extracellular polysaccharide (EPS) was evaluated. The steady state data revealed a shear-thinning behavior, with the viscosity being immediately recovered when the shear rate was decreased. The mechanical spectra indicated viscous solutions with entangled polymer molecules in the range of temperatures studied (from 15°C to 65°C). In addition, the Time–Temperature Superposition principle was successfully applied and the Cox–Merz rule was valid, reinforcing the idea of a thermorheologically simple behavior for the EPS in aqueous solution. Furthermore, the viscous and viscoelastic properties at 25°C were maintained after consecutive heating and cooling cycles, indicating a good thermal stability under temperature fluctuations.
ISSN:0141-8130
1879-0003
DOI:10.1016/j.ijbiomac.2011.02.012