title: The effectiveness of antibiotic activity of penicillin attached to expanded poly(tetrafluoroethylene) (ePTFE) surfaces: a quantitative assessment.
abstract: Recent studies identified and established a platform of polymer surface modifications allowing the attachment of penicillin (PEN) to expanded poly(tetrafluoroethylene) (ePTFE) surfaces. The effectiveness of this approach was accomplished by creating surfaces with chemically attached PEN that prevent the proliferation of microbes. In this study, quantitative assessments of PEN effectiveness attached to ePTFE were conducted. Using variable-angle attenuated total reflectance (ATR-FTIR) spectroscopy, the volume concentration changes of PEN were determined as a function of depth from the ePTFE surface. At depths ranging from 0.2 to 1.2 mum from the surface, PEN concentration levels decrease from 8.85 to 3.33 mug/m3. Assessments of concentration levels of the colony forming units (CFUs) of Staphylococcus aureus bacteria as a function of contact time with the penicillin-polyethylene glycol spacer separated by maleic anhydride ePTFE (PEN-PEG-MA-ePTFE) surfaces showed profound effectiveness of PEN in preventing microbial proliferation. Hydrolytic stability of PEN-PEG-MA-ePTFE surfaces revealed that even with a 32% loss of PEN due to the cleavage of the ester linkages between PEN and PEG spacer, antimicrobial activity is still maintained.
authors.affiliation: School of Polymers and High Performance Materials, Shelby F. Thames Polymer Science Research Center, and Department of Chemistry and Biochemistry, The University of Southern Mississippi, Hattiesburg, MS 39406, USA.
authors.forename: Nattharika
authors.initials: N
authors.lastname: Aumsuwan
authors.forename: Sabine
authors.initials: S
authors.lastname: Heinhorst
authors.forename: Marek W
authors.initials: MW
authors.lastname: Urban
mesh_terms: D000900:Anti-Bacterial Agents / Q000737:chemistry* / Q000494:pharmacology*; D003114:Colony-Forming Units Assay; D015394:Molecular Structure; D010406:Penicillins / Q000737:chemistry* / Q000494:pharmacology*; D011138:Polytetrafluoroethylene / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013211:Staphylococcus aureus / Q000187:drug effects; D013499:Surface Properties
chemical_list: D000900:Anti-Bacterial Agents; D010406:Penicillins; D011138:Polytetrafluoroethylene