Köser, Joachim
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Joachim
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Köser, Joachim
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- PublikationAntimicrobial Polyethylene through Melt Compounding with Quaternary Ammonium Salts(Hindawi Publishing Corporation, 04/2017) Rossetti, Fernanda; Siegmann, Konstantin; Köser, Joachim; Wegner, Irene; Keskin, Ismail; Schlotterbeck, Götz; Winkler, Martin [in: International Journal of Polymer Science]Selected mono- and bicationic quats were compounded with polyethylene. The physicochemical surface properties, leaching behavior, and antibacterial activity of such modified samples were investigated. Contact angle measurements and fluorescein binding assays showed the presence of quaternary ammonium groups at the surface. After storing the samples in 50°C warm water for 30 days, several were still antimicrobially active. No correlation between the number of exposed N+ head groups after leaching and the antibacterial activity was observed. There is however a qualitative correlation of the antibacterial activity with the contact angles and surface concentrations of N+ before leaching/storing in warm water.01A - Beitrag in wissenschaftlicher Zeitschrift
- PublikationReduced Adhesion of E.coli on Nanostructured Polycarbonate Surfaces(08/2016) Grether, Yasmin; Waser, Marcus; Köser, Joachim06 - Präsentation
- PublikationPlasma-Etched Nanostructured Polycarbonate Surfaces for Reduced Adhesion of E.coli bacteria(30.06.2016) Grether, Yasmin; Waser, Marcus; Pieles, Uwe; Köser, JoachimPlasma-etching represents a facile approach to nanostructure polymer surfaces. Here we report on the antibacterial properties of plasma-structured polycarbonate (PC)surfaces. PC foils were structured with O2 plasma and incubated with E.coli. Metabolic activity of adhered live bacteria was quantified with resazurin metabolic indicator. Different incubation times under shaking/resting conditions diminished metabolic activity on structured versus unstructured PC, indicating reduced bacterial adhesion on structured surfaces. Furthermore chemical surface modifications increased metabolic activity on structured compared to unstructured surfaces. Further research on other polymers will be done to analyse the generality of these observations.06 - Präsentation
- PublikationComparing the antimicrobial activity of different commercially available cationic polymers(30.06.2016) Köser, Joachim06 - Präsentation
- PublikationTargeting selective cell response by topographical structuring of resorbable polymer implants(06/2016) Köser, Joachim; Bruggisser, Urs; Beck, Stephan; Kristiansen, Per Magnus06 - Präsentation
- PublikationAntibacterial Active Glass(25.02.2016) Köser, Joachim; Pieles, Uwe; Meier, Pascal; Widmer, A.06 - Präsentation
- PublikationStimulus Dependent Flow through Polymer Modified Filtration Membranes(2016) Köser, Joachim; Pieles, Uwe06 - Präsentation