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https://hdl.handle.net/1822/82269
Título: | Solution properties of an exopolysaccharide from a Pseudomonas strain obtained using glycerol as sole carbon source |
Autor(es): | Hilliou, L. Freitas, Filomena Oliveira, Rui Reis, Maria A.M. Lespineux, David Grandfils, Christian Alves, Vítor D. |
Palavras-chave: | Exopolysaccharide (EPS) Viscosity Glycerol Polyelectrolyte Light scattering |
Data: | 2009 |
Editora: | Elsevier 1 |
Revista: | Carbohydrate Polymers |
Citação: | Hilliou, L., Freitas, F., Oliveira, R., Reis, M. A. M., Lespineux, D., Grandfils, C., & Alves, V. D. (2009, October 15). Solution properties of an exopolysaccharide from a Pseudomonas strain obtained using glycerol as sole carbon source. Carbohydrate Polymers. Elsevier BV. http://doi.org/10.1016/j.carbpol.2009.05.011 |
Resumo(s): | We report the solution properties of a new exopolysaccharide (EPS) obtained from a Pseudomonas strain fed with glycerol as the sole source of carbon. This high molecular mass (3 x 10(6) g mol(-1)) biopolymer is essentially made of galactose monomers with pyruvate and succinate groups imparting a polyelectrolyte character. The Smidsrod parameter B computed from the ionic strength dependence of the intrinsic viscosity indicates that the EPS backbone is rather flexible. In salt free aqueous solutions, the zero shear viscosity scaling with concentration follows a typical polyelectrolyte behavior in bad solvent, whereas at high ionic strength the theological response is reminiscent from neutral polymers. Light scattering data indicate that the EPS adopts a globular conformation as a result of hydrophobic interactions. EPS solutions are stable within 4 days as particle sizing does not indicate EPS aggregation. Both globular conformation and stability against precipitation from solution are attributed to the low charge density of the polyelectrolyte. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/82269 |
DOI: | 10.1016/j.carbpol.2009.05.011 |
ISSN: | 0144-8617 |
Arbitragem científica: | yes |
Acesso: | Acesso restrito UMinho |
Aparece nas coleções: | IPC - Artigos em revistas científicas internacionais com arbitragem |
Ficheiros deste registo:
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Solution properties of an exopolysaccharide .pdf Acesso restrito! | 511,78 kB | Adobe PDF | Ver/Abrir |