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Rheology Property Study of Kappa Carrageenan

??OBJECTIVE To investigate the rheological property of Kappa carrageenan and the effects of standing time, concentration, and temperature on the viscosity of carrageenan solution.METHODS The fluid type was determined by fitting the rheological profiles to Power law model.The effect of temperature on the rheological behavior was investigated according to the viscous flowactivation energy(E??) which was calculated by the Arrhenius formula. RESULTS The viscosity of carrageenan solution decreased with the increase of shear rate and temperature,whereas it increased with the concentration. There existed a positive correlation between E?? and concentration. Furthermore, the effects of different cations on the viscosity were also studied and the results indicated that the viscosity increased significantly with the ionic concentration, especially that of potassium chloride.CONCLUSION Carrageenan was inferred to be pseudo-plastic fluid which hasthe character of shear thinning effect and its viscosity is significantly affected by cationic species.