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Brazilian Journal of Microbiology

versão impressa ISSN 1517-8382versão On-line ISSN 1678-4405

Resumo

HAMADI, Fatima et al. The relation between Escherichia coli surface functional groups' composition and their physicochemical properties. Braz. J. Microbiol. [online]. 2008, vol.39, n.1, pp.10-15. ISSN 1517-8382.  http://dx.doi.org/10.1590/S1517-83822008000100003.

Escherichia coli surface characteristics including hydrophobicity, electrophoretic mobility and surface functional groups' composition were investigated. These characteristics were determined respectively by water contact angle measurements, microelectrophoresis and x-ray photoelectron spectroscopy (XPS). The relation between the physicochemical properties and functional groups' composition was also examined. The electrophoretic mobility at pH 7 appeared to be governed on the cell surface by the (O=C) functional groups. The cell surface's hydrophilicity was associated with high levels of (C-(O.N)) and (OH-(C-O-C)) functional groups, whereas the cell surface's hydrophobicity was associated with (C-(C,H)) functional groups.

Palavras-chave : Escherichia coli; surface functional groups; hydrophobicity; electrophoretic mobility.

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