Exopolysaccharides composition

Bacterial Polysaccharides. Many bacterial species release exopolysaccharides into their environment. The synthesis of capsular and slime polysaccharides or similar sticky surface materials serves as an adhesive to attach the bacteria to solid substrates, even in a marine environment. These polysaccharides range from compositionally simple homopolymers to very complex heteropolymers composed of several individual sugars linked in a variety of ways. 

Although exopolysaccharides do not normaUy have a structural role, they do form structures that can be detected by either light or electron microscopy. Exopolysaccharides may form part of a capsule closely attached to the microbial surface, or appear as loose slime secreted by the cell but not directly attached to it Exopolysaccharide producing cells usually form mucoid colonies on solid media and liquid cultures of these cells may become very viscous. However, growth conditions can influence the composition, physical properties and organisation of exopolysaccharide. 

A survey of the composition of lipopolysaccharides and exopolysaccharides produced by Cystobacter, Archangium, Sorangium, and Stigmatella species has been reported. 3-0-Methyl-D-xylose was detected in several lipopolysaccharides. 

The improvements of the rheological properties of microbial exopolysaccharides through mutagenesis and mutant selection has been demonstrated for Escherichia coli and Enterobacter Klebsiella aerogenes) The chemical composition of each group of polysaccharides produced by the mutants did not show any significant differences from those originating from the parent strain. 

Salazar N, Ruas-Madiedo P, Kolida S, et al. Exopolysaccharides produced by Bifidobacterium longum IPLA E44 and Bifidobacterium animalis subsp. lactis IPLA R1 modify the composition and metabolic activity of human faecal microbiota in pH-controlled batch cultures. 

Microbial exopolysaccharides have a wide range of applications mediation, and bioleaching fields because of their physical, depending on their nature, composition, and structme. rheological, some unique properties, and wide structural... 

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