Original Paper

Extremophiles

, Volume 7, Issue 4, pp 319-326

Mauran, an exopolysaccharide produced by the halophilic bacterium Halomonas maura, with a novel composition and interesting properties for biotechnology

  • Soledad AriasAffiliated withExopolysaccharide Research Group, Department of Microbiology, Faculty of Pharmacy, University of Granada
  • , Ana del MoralAffiliated withExopolysaccharide Research Group, Department of Microbiology, Faculty of Pharmacy, University of Granada
  • , Maria Rita FerrerAffiliated withExopolysaccharide Research Group, Department of Microbiology, Faculty of Pharmacy, University of Granada
  • , Richard TallonAffiliated withUniversity of Bordeaux
  • , Emilia QuesadaAffiliated withExopolysaccharide Research Group, Department of Microbiology, Faculty of Pharmacy, University of Granada Email author 
  • , Victoria BéjarAffiliated withExopolysaccharide Research Group, Department of Microbiology, Faculty of Pharmacy, University of Granada

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Abstract

Mauran is an anionic, sulfated heteropolysaccharide with a high uronic-acid content, synthesized by strain S-30 of the halophilic bacterium Halomonas maura. Under optimum environmental and nutritional conditions, it is capable of producing up to 3.8 g of mauran per liter of medium. Aqueous solutions of mauran are highly viscous and display pseudoplastic, viscoelastic and thixotropic behavior. Its viscosity is stable over a wide pH range (3–11), after freezing-thawing processes, and in the presence of sucrose, salts, surfactants and α-hydroxyl acids. It has a high capacity for binding lead and other cations. Its molecular mass when collected from an MY medium supplemented with 2.5% w/v salt during the stationary growth phase is 4.7×106 Da.

Keywords

Biotechnology Exopolysaccharides Halomonas maura Halophiles Mauran