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TitleInfluence of surface characteristics on the adhesion of Alcaligenes denitrificans to polymeric substrates
Author(s)Teixeira, P.
Oliveira, Rosário
KeywordsInitial adhesion
Polymeric substrates
Zeta potential
Micro-organism adhesion
Issue date1999
JournalJournal of Adhesion Science and Technology
Citation"Journal of adhesion science and technology". ISSN 0169-4243. 13:11 (1999) 1287-1294.
Series/Report no.1999;21
Abstract(s)The adhesion of Alcaligenes denitrificans to several polymeric material was investigated. As the nature of surfaces of the micro-organisms and the substrate materials is an important factor in the adhesion process, characteristics such as the electrokinetic potential and hydrophobicity were also determined and correlated with the capacity of bacterial cells to adhere to solid surfaces. The substrates used were high-density polyethylene (HDPE), polypropylene (PP), poly (vinyl chloride) (PVC), and poly (methyl methacrylate) (PMMA). The electrokinetic potential of the cells and the substrates was determined by measurements of electrophoretic mobility and the hydrophobicity was determined by contact angle measurements. All the substrates studied as well as the bacterial strain have a negative zeta potential, which means that adhesion is not mediated by electrostatic interactions. As far as hydrophobicity is concerned, PP is the most hydrophobic material, PMMA is the least hydrophobic, whereas HDPE and PVC present an intermediate behavior. As bacterial cells are hydrophilic, adhesion is favored to PP; therefore, this substrate material seems to be the one that promotes a stronger adhesion and the development of the most stable biofilm for use as a biomass carrier in denitrifying inverse fluidized bed reactors. This was confirmed by the results of adhesion tests. In this way, adhesion seems to be dominated by hydrophobic interactions.
AccessOpen access
Appears in Collections:CEB - Publicações em Revistas/Séries Internacionais / Publications in International Journals/Series

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