TY - JOUR
T1 - Influence of temperature on the rheological behavior of a new fucose-containing bacterial exopolysaccharide
AU - Freitas, Filomena
AU - Reis, Maria D'ascensão Carvalho Fernandes Miranda
PY - 2011/1/1
Y1 - 2011/1/1
N2 - 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 degrees C to 65 degrees 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 degrees C were maintained after consecutive heating and cooling cycles, indicating a good thermal stability under temperature fluctuations. (C) 2011 Elsevier B.V. All rights reserved.
AB - 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 degrees C to 65 degrees 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 degrees C were maintained after consecutive heating and cooling cycles, indicating a good thermal stability under temperature fluctuations. (C) 2011 Elsevier B.V. All rights reserved.
KW - Rheology
KW - Enterobacter sp.
KW - Microbial polysaccharide
KW - Temperature
U2 - 10.1016/j.ijbiomac.2011.02.012
DO - 10.1016/j.ijbiomac.2011.02.012
M3 - Article
SN - 0141-8130
VL - 48
SP - 695
EP - 699
JO - International Journal of Biological Macromolecules
JF - International Journal of Biological Macromolecules
IS - 4
ER -