Dynamic rheological studies of exopolysaccharides produced by bacteria of Rhizobium and Mesorhizobium genus

Authors

  • Aranda-Selverio G.
  • Vasconcelos A.F.D.
  • Lemos E.G.M.
  • Silveira J.L.M.
  • Corradi da Silva M.L.

Keywords:

Exopolysaccharides, Rhizobium, Mesorhizobium, Viscoelastic behavior, Gel

Abstract

Three different bacteria strains of Rhizobium genus were used in the production of exopolysaccharides. EPS R1 and R2 were produced from Rhizobium tropici. EPS R3 was produced from a Mesorhizobium strain and R4 from Rhizobium sp strain. All the exopolysaccharides were selected for dynamic rheological studies. Rhizobium exopolysaccharides demonstrated viscoelastic behavior and strong gelling characteristics. R3 was the less viscous probably due to a high content of uronic acids (8, 4%) on its structure. Moreover, R3 exhibited viscous solution behavior at low concentration, and viscoelastic weak gelling at high concentrations. Analysis of temperature influence over exopolysaccharide solutions with viscoelastic behavior showed strong gelling characteristics for R1, R2 and R4 at the range of 5-95ºC (5g/L). In addition, all exopolysaccharides had strong gelling characteristics at 5ºC. These polymers are good candidates to be used in industrial processes, especially involving temperature variations, at least in the range from 5-60οC.

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Published

2020-08-22

How to Cite

Aranda-Selverio G., Vasconcelos A.F.D., Lemos E.G.M., Silveira J.L.M. and Corradi da Silva M.L. (2020) “Dynamic rheological studies of exopolysaccharides produced by bacteria of Rhizobium and Mesorhizobium genus”, International Journal of Research in BioSciences (IJRBS), 5(3), pp. 42-47. Available at: http://www.ijrbs.in/index.php/ijrbs/article/view/208 (Accessed: 20May2024).

Issue

Vol. 5 No. 3 (2016): July

Section

Articles