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  • 1.
    Ek, Monica
    et al.
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Wood Chemistry and Pulp Technology.
    Westman, Eva-Helena
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
    Karlsson, Josefin
    Wågberg, Lars
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Fibre Technology.
    CELL 28-Biointeractive fibers with antibacterial properties2008In: ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY: Volume: 235, 2008, p. 28-CELL-Conference paper (Refereed)
    Abstract [en]

    Growth of bacteria on various surfaces may cause major concern if encountered in the wrong environment.  The ability to impart antimicrobial properties onto surfaces is therefore desirable.  Modification of both glass surfaces and cellulose membranes using weak polyelectrolytes as antimicrobial agent is presented.  The aim was to incorporate a known carrier of antimicrobial activity into a multilayer structure of adsorbed polyelectolytes at different surfaces and evaluate the antibacterial activities.  The approach involved screening for antimicrobial activity in soln. of modified and unmodified polymers.  The polymers were evaluated against gram-neg. E. coli and gram-pos. B. subtilis. In order to elucidate the mode of action of the polymers, the charge was detd.  This is done since earlier studies have shown that both charge and degree of hydrophobicity are of importance in terms of exerted activity.  Results show that the chosen polymers exert activity in the immobilized state.  Different techniques have been used to evaluate the mechanisms.

  • 2.
    Ek, Monica
    et al.
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
    Westman, Eva-Helena
    Wågberg, Lars
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
    Cellulose films and fibres with antibacterial properties2007Conference paper (Refereed)
  • 3.
    Westman, Eva-Helena
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
    Antimicrobial activity of solid surfaces treated with hydrophobically modified polyvinylamine2007Licentiate thesis, comprehensive summary (Other scientific)
  • 4.
    Westman, Eva-Helena
    et al.
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
    Ek, Monica
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Wood Chemistry and Pulp Technology.
    Enarsson, Lars-Erik
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
    Wågberg, Lars
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
    Assessment of Antibacterial Properties of Polyvinylamine (PVAm) with Different Charge Densities and Hydrophobic Modifications2009In: Biomacromolecules, ISSN 1525-7797, E-ISSN 1526-4602, Vol. 10, no 6, p. 1478-1483Article in journal (Refereed)
    Abstract [en]

    Hydrophobically modified and unmodified polyvinylamines (PVAm), including a total of five polymers, were tested against both gram-negative (Escherichia coli) and gram-positive (Bacillus subtilis) bacteria for antimicrobial activity. The assessment of PVAm in solution against bacteria is described, and the influence of the charge density and of the hydrophobic modification of the polyelectrolyte is discussed. The antimicrobial activity was found to depend upon the concentration of PVAm and also on the type of bacteria used. The results also indicated that no direct relationship exists between antimicrobial activity and charge density of the different PVAms. It was, however, observed that an alkyl chain length of six or eight alkane units had a substantial effect on the bacteria investigated. The best combined antibacterial activity for the two bacteria tested was achieved for PVAm with a C-6 alkane substituent (PVAm C-6). To evaluate the antimicrobial activity on a solid substrate, PVAm C-6 was further studied after being deposited onto a glass slide and the results show a large reduction in bacterial infection.

  • 5.
    Westman, Eva-Helena
    et al.
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
    Ek, Monica
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Wood Chemistry and Pulp Technology.
    Wågberg, Lars
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
    Antimicrobial activity of polyelectrolyte multilayer-treated cellulose films2009In: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434X, Vol. 63, no 1, p. 33-39Article in journal (Refereed)
    Abstract [en]

    A polyelectrolyte multilayer film with antimicrobial properties was prepared by the layer-by-layer technique on porous cellulose membranes by the alternate adsorption of hydrophobically modified polyvinylamine (PVAm) and polyacrylic acid. The approach included the introduction of negative charges onto cellulose membranes by NaBr and TEMPO-catalysed oxidation which created anchoring sites for the positively charged PVAm. The antibacterial activity of the cellulose membranes were tested with the Gram-negative bacterium Escherichia coli as organism. A significant decrease in bacterial growth was observed with increasing number of polymeric bilayers (between three and six layers of cationic polymer) on the cellulose membranes. The antimicrobial property was ascribed to the modified PVAm.

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