Binding of Colloidal MnO(2) by Extracellular Polysaccharides of Pedomicrobium manganicum.
The extracellular acidic polysaccharides of the manganese-oxidizing bacterium Pedomicrobium manganicum were able to bind preformed colloidal MnO(2). The capacity of the cells to bind MnO(2) was pH dependent. Enhanced binding capacity below pH 5 suggests that ionic bonding forces are involved in the binding mechanism and that there is a charge reversal on the acidic polysaccharides between pH 5 and 4 that is due to increased protonation of carboxyl groups.
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Department of Microbiology, University of Queensland, Brisbane, Queensland, and Division of Chemical Technology and Polymers, Commonwealth Scientific and Industrial Research Organisation, Clayton, Victoria, Australia.
Arunpairojana
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Dixon
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