Influence of extracellular polymers on electrokinetic properties of heterotrophic bacterial cells examined by soft particle electrophoresis theory

Satoshi Tsuneda*, Jaekook Jung, Hiroshi Hayashi, Hirotoshi Aikawa, Akira Hirata, Hiroshi Sasaki

*この研究の対応する著者

研究成果: Article査読

89 被引用数 (Scopus)

抄録

In this study, influence of extracellular polymeric substance (EPS) on the bacterial electrokinetics and cell adhesion to glass beads was examined for four kinds of heterotrophic bacteria (A1, A2, B1 and B2 strains) isolated from a biological reactor treating domestic wastewater. Electrophoretic mobility data were analyzed by Ohshima's soft particle theory. Cell adhesion to glass beads was carried out by packed-bed method, and the data were interpreted as the cell collision efficiency. Electrophoretic mobility measurements showed that all four strains had soft particle characters. EPS covering on cell surface increased the softness of the cell surface and decreased the negative surface charge density around the cell surface. For A1, A2 and B1 strains, both surface potential based on soft particle theory Ψ0 and conventional zeta potential ζ of intact were lower than those of washed cells. While ζ increased from -31.6 to -27.2 mV when EPS was removed, Ψ0 estimated from soft particle altered from -11.0 to -14.9 mV in the case of B2 strain, indicating EPS covering resulted in the increase of cell surface potential. Cell collision efficiencies are in qualitative agreement with the result of the cell surface potential evaluation based on soft particle analysis.

本文言語English
ページ(範囲)181-188
ページ数8
ジャーナルColloids and Surfaces B: Biointerfaces
29
2-3
DOI
出版ステータスPublished - 2003 6月 1

ASJC Scopus subject areas

  • バイオテクノロジー
  • 表面および界面
  • 物理化学および理論化学
  • コロイド化学および表面化学

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