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The Fractional derivative rheological model and the linear viscoelastic behavior of hydrocolloids

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Orczykowska M., Dziubiński M.
Chemical and Process Engineering
|
2012
|
issue 1
2
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The Fractional derivative rheological model and the linear viscoelastic behavior of hydrocolloids

100%
Orczykowska M., Dziubiński M.
Chemical and Process Engineering
|
2012
|
vol. 33
|
issue 1
141-151
EN
This study was aimed at evaluating the possibility to use the Friedrich-Braun fractional derivative rheological model to assess the viscoelastic properties of xanthan gum with rice starch and sweet potato starch. The Friedrich-Braun fractional derivative rheological model allows to describe viscoelastic properties comprehensively, starting from the behaviour characteristic of purely viscous fluids to the behaviour corresponding to elastic solids. The Friedrich-Braun fractional derivative rheological model has one more virtue which distinguishes it from other models, it allows to determine the relationship between stress and strain and the impact of each of them on viscoelastic properties on the tested material. An analysis of the data described using the Friedrich-Braun fractional derivative rheological model allows to state that all the tested mixtures of starch with xanthan gum form macromolecular gels exhibiting behaviour typical of viscoelastic quasi-solid bodies. The Friedrich-Braun fractional derivative rheological model and 8 rheological parameters of this model allow to determine changes in the structure of the examined starch - xanthan gum mixtures. Similarly important is the possibility to find out the trend and changes going on in this structure as well as their causes.
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