Characterization of metal-binding bioflocculants produced by the cyanobacterial component of mixed microbial mats.

摘要: Mixed-species microbial mats that were dominated by the cyanobacterium Oscillatoria sp. and contained heterotrophic purple autotrophic bacteria constructed for specific bioremediation applications. When challenged with metals, production secretion of metal-binding extracellular polysaccharide bioflocculants observed. The concentration these negatively charged polysaccharides was correlated removal manganese from water column beneath a surface mat. Bioflocculants an isolated mat collected concentrated characterization. A chromatographic analysis revealed heterogeneous population respect to charge density molecular size. subpopulation which exhibited highest level flocculating activity polyanionic had weight more than 200,000. glycosyl presence galacturonic acid (2.2%) glucuronic (1.86%). components, at pH levels generated during photosynthesis (pH > 7.5), may account properties mats.