Characterization of non-linear rheological behavior of SPI-FG dispersions using LAOS tests and FT rheology

Chong Hao Bi, Dong Li, Li Jun Wang, Yong Wang, Benu Adhikari

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25 Citations (Scopus)

Abstract

The effect of flaxseed gum (FG) on the rheological and nonlinear stress response behaviors of mixed soy protein isolate (SPI)-flaxseed gum (FG) dispersions were studied. Results showed that the viscosity of the SPI-FG mixed dispersions increased significantly with increase in the FG concentration. Both the shear stress and the apparent viscosity values as a function of shear rate were fitted well using Power law model as expected. The frequency dependence of G′, G′′ and tan δ of soy protein isolate decreased as the FG concentration increased. The large amplitude oscillatory shear (LAOS) test and Fourier transform (FT) rheology analysis showed that the addition of flaxseed gum strongly affected the structure of the SPI-FG mixed dispersion system as shown by deformation of the nonlinear stress response curve and significantly altered magnitude of higher harmonic curve. The addition of FG increased the instantaneous strain softening effect of the SPI-FG mixed dispersion system.

Original languageEnglish
Pages (from-to)1151-1158
Number of pages8
JournalCarbohydrate Polymers
Volume92
Issue number2
DOIs
Publication statusPublished - 15 Feb 2013

Keywords

  • Flaxseed gum
  • Fourier transform rheology
  • Rheological behavior
  • Soy protein isolate
  • Time-temperature superposition

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