Importance of Extracellular Polymeric Substances from Thiobacillus ferrooxidans for Bioleaching

Author:

Gehrke Tilman1,Telegdi Judit2,Thierry Dominique3,Sand Wolfgang1

Affiliation:

1. Institute for General Botany, Department of Microbiology, University of Hamburg, D-22609 Hamburg, Germany1;

2. Central Research Institute for Chemistry, H-1025 Budapest, Hungary2; and

3. Swedish Corrosion Institute, S-10405 Stockholm, Sweden3

Abstract

ABSTRACT Leaching bacteria such as Thiobacillus ferrooxidans attach to pyrite or sulfur by means of extracellular polymeric substances (EPS) (lipopolysaccharides). The primary attachment to pyrite at pH 2 is mediated by exopolymer-complexed iron(III) ions in an electrochemical interaction with the negatively charged pyrite surface. EPS from sulfur cells possess increased hydrophobic properties and do not attach to pyrite, indicating adaptability to the substrate or substratum.

Publisher

American Society for Microbiology

Subject

Ecology,Applied Microbiology and Biotechnology,Food Science,Biotechnology

Reference34 articles.

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2. The selective adsorption of thiobacilli to dislocation sites on pyrite surfaces.;Andrews G. F.;Biotechnol. Bioeng.,1988

3. Anonymous Bestimmung von Eisen E 1 Deutsche Einheitsverfahren zur Wasser- Abwasser- und Schlammuntersuchung. 1984 1 10 Verlag Chemie Weinheim Germany

4. The adsorption of Thiobacillus ferrooxidans on coal surfaces.;Bagdigian R. M.;Biotechnol. Bioeng.,1986

5. Enhanced Yields of Iron-Oxidizing Bacteria by In Situ Electrochemical Reduction of Soluble Iron in the Growth Medium

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