Rheological Behavior of Seed Gum from Cassia fistula

Abstract:

The C. fistula gums in aqueous solutions clearly exhibited shear-thinning flow behavior at high shear rate, however, at higher concentrations, pronounced shear thinning was observed. The value of zero shear viscosity [h₀] was predicted by fitting Cross model. A plotting of specific viscosity at zero shear rate (h_sp0) against coil overlap parameter (C[h]) was shown the linear slope of dilute and simi-dilute as 1.43 and 4.10, respectively, which found the critical concentration (C*) about 7.08/[h]. While, the mechanical spectra in the linear viscoelastic region of gum solutions showed the typical shape for macromolecular solutions.

• Periodical: Key Engineering Materials (Volume 818)
• Pages: 16-20
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.818.16
• Online since: August 2019
• Authors: Wancheng Sittikijyothin, Khanaphit Khumduang, Keonakhone Khounvilay, Rattanaphol Mongkholrattanasit*
• Keywords: Cassia fistula, Cross Model, Galactomannan, Rheological Behaviour

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