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Updated: Feb 4, 2026

Biological Preparation and Mechanical Technique for Determining Viscoelastic Properties of Zonular Fibers
Published on: December 16, 2021
Flow, dynamic viscoelastic and creep properties of a biological polymer produced by Sphingomonas sp. as affected by
M Carmen García1, Luis A Trujillo1, José A Carmona1
1Departamento de Ingeniería Química, Facultad de Química, Universidad de Sevilla, C/ Profesor García González, s/n, 41012 Sevilla, Spain.
Abstract:
In this work, the influence of the concentration on the flow behaviour, dynamic viscoelastic and creep properties of diutan gum in aqueous solution was investigated. Diutan gum is a biopolymer which belongs to the sphingans group. To know its rheological properties and its microstructure as a function of the concentration is directly related to the current and future applications of this biological polymer. Mechanical spectra showed a crossover point between G' and G″ which changed as a function of diutan gum concentration. A master curve for the frequency dependence on the η* was obtained. The creep compliance results made it possible to deduce the yield stress value and they were fitted to Burgers model. A shear-thinning behaviour was exhibited by diutan gum aqueous solutions, which was fitted to the Carreau-Yasuda model. Higher G', G″, τ0 and η0 values and lower ωc, Je0, γ̇c and n values were obtained by increasing the gum concentration, it is being possible to modulate the viscoelasticity, viscosity and shear resistance as a function of concentration. A more complex structure with stronger entanglements between macromolecules of diutan was obtained when the concentration of diutan increases.
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