Adhesion of Escherichia coli onto quartz, hematite and corundum: Extended DLVO theory and flotation behavior

Mohsen Farahat, Tsuyoshi Hirajima, Keiko Sasaki, Katsumi Doi

研究成果: ジャーナルへの寄稿記事

47 引用 (Scopus)

抄録

The adhesion of Escherichia coli onto quartz, hematite and corundum was experimentally investigated. A strain of E. coli was used that had the genes for expressing protein for silica precipitation. The maximum cell adhesion was observed at pH <4.3 for quartz and at pH 4.5-8.5 for corundum. For hematite, cell adhesion remained low at all pH values. The microbe-mineral adhesion was assessed by the extended DLVO theory approach. The essential parameters for calculation of microbe-mineral interaction energy (Hamaker constants and acid-base components) were experimentally determined. The extended DLVO approach could be used to explain the results of the adhesion experiments. The effect of E. coli on the floatability of three oxide minerals was determined and the results showed that E. coli can act as a selective collector for quartz at acidic pH values, with 90% of the quartz floated at 1.5 × 109 cells/ml. However, only 9% hematite and 30% corundum could be floated under similar conditions. By using E. coli and no reagents, it was possible to separate quartz from a hematite-quartz mixture with Newton's efficiency of 0.70. Removal of quartz from the corundum mixture was achieved by E. coli with Newton's efficiency of 0.62.

元の言語英語
ページ(範囲)140-149
ページ数10
ジャーナルColloids and Surfaces B: Biointerfaces
74
発行部数1
DOI
出版物ステータス出版済み - 11 1 2009

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flotation
Quartz
Corundum
Aluminum Oxide
Hematite
hematite
Escherichia
Flotation
Escherichia coli
adhesion
Adhesion
quartz
aluminum oxides
Minerals
Cell adhesion
minerals
microorganisms
Cell Adhesion
newton
cells

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry
  • Surfaces and Interfaces

これを引用

Adhesion of Escherichia coli onto quartz, hematite and corundum : Extended DLVO theory and flotation behavior. / Farahat, Mohsen; Hirajima, Tsuyoshi; Sasaki, Keiko; Doi, Katsumi.

:: Colloids and Surfaces B: Biointerfaces, 巻 74, 番号 1, 01.11.2009, p. 140-149.

研究成果: ジャーナルへの寄稿記事

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abstract = "The adhesion of Escherichia coli onto quartz, hematite and corundum was experimentally investigated. A strain of E. coli was used that had the genes for expressing protein for silica precipitation. The maximum cell adhesion was observed at pH <4.3 for quartz and at pH 4.5-8.5 for corundum. For hematite, cell adhesion remained low at all pH values. The microbe-mineral adhesion was assessed by the extended DLVO theory approach. The essential parameters for calculation of microbe-mineral interaction energy (Hamaker constants and acid-base components) were experimentally determined. The extended DLVO approach could be used to explain the results of the adhesion experiments. The effect of E. coli on the floatability of three oxide minerals was determined and the results showed that E. coli can act as a selective collector for quartz at acidic pH values, with 90{\%} of the quartz floated at 1.5 × 109 cells/ml. However, only 9{\%} hematite and 30{\%} corundum could be floated under similar conditions. By using E. coli and no reagents, it was possible to separate quartz from a hematite-quartz mixture with Newton's efficiency of 0.70. Removal of quartz from the corundum mixture was achieved by E. coli with Newton's efficiency of 0.62.",
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