Chemical and rheological properties of exopolysaccharides produced by four isolates of rhizobia
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Data
2015
Autores
Moretto, Cristiane [UNESP]
Castellane, Tereza Cristina Luque [UNESP]
Lopes, Erica Mendes [UNESP]
Omori, Wellington Pine [UNESP]
Sacco, Laís Postai [UNESP]
Lemos, Eliana Gertrudes de Macedo [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Elsevier B. V.
Resumo
The rheological, physicochemical properties, emulsification and stability of exopolysaccharides (EPSs) from four rhizobia isolates (LBMP-C01, LBMP-C02, LBMP-C03 and LBMP-C04) were studied. The EPS yields of isolates under these experimental conditions were in the range of 1.5-6.63gL(-1). The LBMP-C04 isolate, which presented the highest EPS production (6.63gL(-1)), was isolated from Arachis pintoi and was identified as a Rhizobium sp. strain that could be explored as a possible potential source for the production of extracellular heteropolysaccharides. All polymers showed a pseudoplastic non-Newtonian fluid behavior or shear thinning property in aqueous solutions. Among the four EPS tested against hydrocarbons, EPS LBMP-C01 was found to be more effective against hexane, olive and soybean oils (89.94%, 82.75% and 81.15%, respectively). Importantly, we found that changes in pH (2-11) and salinity (0-30%) influenced the emulsification of diesel oil by the EPSs. EPSLBMP-C04 presented optimal emulsification capacity at pH 10 (E24=53%) and 30% salinity (E24=27%). These findings contribute to the understanding of the influence of the chemical composition, physical properties and biotechnology applications of rhizobial EPS solutions their bioemulsifying properties.
Descrição
Palavras-chave
Bioemulsifier, Biopolymers, Rhizobium
Como citar
International Journal Of Biological Macromolecules, v. 81, p. 291-298, 2015.