Influence of glycerol and temperature on the rheological properties of potato starch solutions

• Autorzy: Ayala G. , Vargas R. A. , Agudelo A. C.
• Języki publikacji: EN

Abstrakty

EN

Effects of temperature and glycerol concentration on rheological properties of potato starch solutions were investi- gated. The flow behaviour (shear stress against shear rate) was fitted to various models: power law, Herschel-Bulkley, Bingham, modified Bingham and Casson models. However, it was found that the Herschel-Bulkley model describes better the flow behaviour observed at various temperatures and glycerol concentrations, for flow behaviour index values between 0.44 and 0.78, typical of pseudoplastic solutions. The effect of glycerol concentration on each of the fitting parameters for Herschel-Bulkley model was well modelled by a second-degree polynomial at various temperatures. The simultaneous influence of glycerol concentration and tempe- rature on shear stress could be represented empirically by a second- degree polynomial function that includes linear coupling between concentration and temperature. Finally, the variation of the con- sistency coefficient with both temperature and glycerol concentra- tion was well described by an exponential expression, with an acti- vation energy value of 2.78 kJ mol -1 . The results indicate that both glycerol content and temperature have the effect of diluting potato starch solutions.

Słowa kluczowe

EN

glycerol; temperature; rheological property; potato starch; solution; pseudoplastic behaviour; rheological model

• Wydawca: -
• Czasopismo: International Agrophysics
• Rocznik: 2014
• Tom: 28
• Numer: 3
• Opis fizyczny: p.261-268,fig.,ref.

Twórcy

autor

Ayala G.

• Faculty of Animal Science and Food Engineering, University of Sao Paulo, Av.Duque de Caxias Norte 225, 13635-000, Pirassununga, SP, Brazil

autor

Vargas R. A.

• Department of Physics, Univalle University, AA 25360, Cali, Colombia

autor

Agudelo A. C.

• Faculty of Engineering and Administration, National University of Colombia, Palmira Campus, AA 237, Colombia

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