Evaluation of the biotechnological potential of Rhizobium tropici strains for exopolysaccharide production

•R. tropici mutants that produced high levels of EPS compared to the wild-type.•RP-HPLC analysis showed that EPS was a heteropolysaccharide with six different sugars.•Rhizobial EPS showed a typical non-Newtonian and pseudoplastic.•The MUTZC3, JAB1 and JAB6 can be suggested as best strains for the in...

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Published inCarbohydrate polymers Vol. 111; pp. 191 - 197
Main Authors Castellane, Tereza Cristina Luque, Lemos, Manoel Victor Franco, Lemos, Eliana Gertrudes de Macedo
Format Journal Article
LanguageEnglish
Published Kidlington Elsevier Ltd 13.10.2014
Elsevier
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Summary:•R. tropici mutants that produced high levels of EPS compared to the wild-type.•RP-HPLC analysis showed that EPS was a heteropolysaccharide with six different sugars.•Rhizobial EPS showed a typical non-Newtonian and pseudoplastic.•The MUTZC3, JAB1 and JAB6 can be suggested as best strains for the industry.•These exopolysaccharides could be explored as a novel potential biotechnology. Rhizobium tropici, a member of the Rhizobiaceae family, has the ability to synthesize and secrete extracellular polysaccharides (EPS). Rhizobial EPS have attracted much attention from the scientific and industrial communities. Rhizobial isolates and R. tropici mutants that produced higher levels of EPS than the wild-type strain SEMIA4080 were used in the present study. The results suggested a heteropolymer structure for these EPS composed by glucose and galactose as prevailing monomer unit. All EPS samples exhibited a typical non-Newtonian and pseudoplastic fluid flow, and the aqueous solutions apparent viscosities increased in a concentration-dependent manner. These results serve as a foundation for further studies aimed at enhancing interest in the application of the MUTZC3, JAB1 and JAB6 strains with high EPS production and viscosity can be exploited for the large-scale commercial production of Rhizobial polysaccharides.
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content type line 23
ISSN:0144-8617
1879-1344
DOI:10.1016/j.carbpol.2014.04.066