Merck
  • Início
  • Resultados da busca
  • Adhesion of Escherichia coli to nano-Fe/Al oxides and its effect on the surface chemical properties of Fe/Al oxides.

Adhesion of Escherichia coli to nano-Fe/Al oxides and its effect on the surface chemical properties of Fe/Al oxides.

Colloids and surfaces. B, Biointerfaces (2013-06-05)
Zhao-Dong Liu, Jiu-Yu Li, Jun Jiang, Zhi-Neng Hong, Ren-Kou Xu
RESUMO

We investigated the adhesion of Escherichia coli to α-Fe2O3 and γ-Al2O3 and the effects of adhesion on the surface properties of the oxides in batch experiments, where we conducted potentiometric titration, zeta potential measurements, and FTIR spectroscopy. The adhesion isotherms fitted a Langmuir equation well. γ-Al2O3 had a higher adhesion capacity than α-Fe2O3 because of the higher positive charge on γ-Al2O3. The adhesion of E. coli to Fe/Al oxides decreased with increasing pH. Adhesion increased with increasing NaCl concentration, reaching its maximum at 0.05M for α-Fe2O3 and at 0.1M for γ-Al2O3, after which it decreased with further increases in NaCl concentration. Therefore, the electrostatic force plays an important role in the adhesion of E. coli to Fe/Al oxides. The zeta potential-pH curves of the binary-system fell between that for bacteria and those for Fe/Al oxides. Thus, overlapping of the diffuse layers of the electric double layers on the negatively-charged E. coli and positively-charged Fe/Al oxides reduced the effective surface charge density of the minerals and bacteria. E. coli adhesion decreased the point of zero salt effect and the isoelectric point of the Fe/Al oxides. The FTIR spectra indicated that non-electrostatic force also contributed to the interaction between E. coli and Fe/Al oxides, in addition to the electrostatic force between them.

MATERIAIS
Número do produto
Marca
Descrição do produto

Sigma-Aldrich
Aluminum oxide, mesoporous, MSU-X (wormhole), average pore size 3.8 nm
Sigma-Aldrich
Aluminum oxide, nanopowder, <50 nm particle size (TEM)
Sigma-Aldrich
Aluminum oxide, nanoparticles, <50 nm particle size (DLS), 20 wt. % in isopropanol
Sigma-Aldrich
Aluminum oxide, nanowires, diam. × L 2-6 nm × 200-400 nm
Sigma-Aldrich
Aluminum oxide, 99.997% trace metals basis
Supelco
Aluminum oxide, activated, neutral, Brockmann Activity I
Supelco
Aluminum oxide, for the determination of hydrocarbons
Sigma-Aldrich
Aluminum oxide, nanoparticles, 30-60 nm particle size (TEM), 20 wt. % in H2O
Sigma-Aldrich
Aluminum oxide, single crystal substrate, <0001>
Sigma-Aldrich
Aluminum oxide, activated, basic, Brockmann I
Sigma-Aldrich
Aluminum oxide, activated, neutral, Brockmann I
Sigma-Aldrich
Aluminum oxide, Type WN-6, Neutral, Activity Grade Super I
Sigma-Aldrich
Aluminum oxide, powder, primarily α phase, ≤10 μm avg. part. size, 99.5% trace metals basis
Sigma-Aldrich
Aluminum oxide, pore size 58 Å, ~150 mesh
Sigma-Aldrich
Aluminum oxide, pellets, 3 mm
Sigma-Aldrich
Aluminum oxide, powder, 99.99% trace metals basis
Sigma-Aldrich
Aluminum oxide, Corundum, α-phase, -100 mesh
Sigma-Aldrich
Aluminum oxide, fused, powder, primarily α-phase, -325 mesh
Sigma-Aldrich
Aluminum oxide, calcined, powder, primarily α-phase, 100-325 mesh
Sigma-Aldrich
Aluminum oxide, fused, powder, primarily α-phase, 100-200 mesh
Sigma-Aldrich
Aluminum oxide, activated, neutral, Brockmann I, free-flowing, Redi-Dri
Sigma-Aldrich
Aluminum oxide, nanopowder, 13 nm primary particle size (TEM), 99.8% trace metals basis
Sigma-Aldrich
Aluminum oxide, activated, acidic, Brockmann I
Sigma-Aldrich
Aluminum oxide, activated, acidic, Brockmann I, free-flowing, Redi-Dri