Interactions of pathogens Escherichia coli and Streptococcus suis with clay minerals

摘要: Abstract The adsorption of two agricultural isolates pathogens Escherichia coli and Streptococcus suis on common clay minerals (montmorillonite kaolinite) was investigated as a function pH ionic strength (IS) using batch studies. Electrokinetic properties interaction energies between the cells were quantified at different (4.0–9.0) IS (1–100 mM KCl CaCl 2 ) by applying classic Derjaguin–Landau–Verwey–Overbeek (DLVO) theory. isotherms bacteria conformed to Freundlich equation. More S. found be adsorbed than E. , with calculated K f values 2–8 times higher those . As for examined pathogens, their capacities montmorillonite greater kaolinite. Increasing solution (≥ 4.0) or decreasing (≤ 20 mM) resulted in less result decrease measured zeta potentials subsequently electrostatic repulsion. This trend generally agreement predictions from DLVO Conversely, (≥ 50 mM) reduced cell adsorption, likely due an additional non-DLVO type (electrosteric repulsion) occurring presence extracellular macromolecules. finding provides important insight into pathogenic behavior soil associated environments.