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• W565701913 startingPage "79" @default.
• W565701913 abstract "Extracellular polymeric substances (EPSs) have been confirmed to affect bacterial surface properties and cell attachment to minerals. However, no systematic work has been done to clarify the contrasting roles of EPS in cell attachment to natural soil between different pathogenic strains. This study compared the different surface properties and attachment behaviors of two bacterial pathogens (with full or partial EPS) using attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy, potentiometric titration, zeta potential, hydrophobicity analysis, DLVO theory, and attachment tests. Cation exchange resin (CER) was employed to remove the EPS on Streptococcus suis and Escherichia coli such that the contribution of EPS to cell attachment to soil could be determined. ATR-FTIR confirmed the binding sites differed between S. suis and E. coli EPS. Notably, after partial EPS removal the absorption bands of S. suis between 1800 cm−1 and 800 cm−1 shifted or disappeared, whereas the lack of EPS did not affect the infrared absorption peaks for E. coli. This result suggests the overall surface site types within the E. coli EPS were similar to the residual EPS fractions or cell wall. The partial removal of EPS also changed the proton-active site concentrations of both cell types, and reduced the bacterial surface charge densities by 7%–17%. The negative charges on bacterial surfaces followed the order of full EPS-S. suis < partial EPS-S. suis < partial EPS-E. coli < full EPS-E. coli (ionic strength 1–100 mM; pH 5.6–5.8). With the removal of EPS, the average hydrophobicities of S. suis increased by 5% while those of E. coli decreased by 11%. EPS removal inhibited the attachment of S. suis to soil particles (< 2 mm) but enhanced E. coli attachment across the IS range of 1–100 mM, which was attributed to the alteration in electrostatic repulsion. At IS 60–100 mM, a sudden reduction in the attachment was observed only for full EPS-S. suis, which could be ascribed to the steric hindrance derived from EPS. However, full EPS-E. coli and partial EPS-E. coli showed similar increasing attachment trends at IS 1–100 mM. This study clearly showed the distinct contribution of EPS to pathogen attachment to soil as a function of cell type and EPS present." @default.
• W565701913 created "2016-06-24" @default.
• W565701913 creator A5037188176 @default.
• W565701913 creator A5052177245 @default.
• W565701913 creator A5053946303 @default.
• W565701913 creator A5072333827 @default.
• W565701913 date "2015-09-01" @default.
• W565701913 modified "2023-10-12" @default.
• W565701913 title "Contrasting effects of extracellular polymeric substances on the surface characteristics of bacterial pathogens and cell attachment to soil particles" @default.
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