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Type: Journal article
Title: Plasma activated coatings with dual action against fungi and bacteria
Author: Akhavan, B.
Michl, T.
Giles, C.
Ho, K.
Martin, L.
Sharifahmadian, O.
Wise, S.
Coad, B.
Kumar, N.
Griesser, H.
Bilek, M.
Citation: Applied Materials Today, 2018; 12:72-84
Publisher: ScienceDirect
Issue Date: 2018
ISSN: 2352-9407
Statement of
Behnam Akhavan, Thomas D.Michl, Carla Giles, Kitty Ho, Lewis Martin, Omid Sharifahmadian, Steven G.Wise, Bryan R.Coad, Naresh Kumar, Hans J. Griesser, Marcela M.Bilek
Abstract: In the oral cavity, dental implants are exposed to an environment rich in various microbes that can produce infectious biofilms on the implant surface. Here we report the development of two distinct antimicrobial coatings that prevent biofilm formation by fungi or bacteria. The antimicrobial peptides Mel4 and caspofungin were immobilized on titanium surfaces through reactions with radicals embedded within a mechanically robust, ion-assisted plasma polymerized (PP) film. The immobilization does not require additional chemical reagents and is achieved by simply incubating the surfaces at room temperature in a buffer solution containing the antimicrobial agent. The antibiotic-functionalized surfaces were rigorously washed with hot sodium dodecyl sulphate (SDS) to remove physisorbed molecules, and analyzed by time of flight secondary ion mass spectrometry (ToF-SIMS), which revealed characteristic fragments of the peptides and provided strong evidence for the covalent nature of the binding between the molecules and the PP coating. Both Candida albicans and Staphylococcus aureus pathogens were significantly inhibited in their ability to colonize the surfaces and form biofilms. Our findings suggest that antimicrobial surfaces fabricated using ion-assisted plasma polymerization have great potential for coatings on biomedical devices where activity against fungal and bacterial pathogens is required.
Keywords: Plasma polymerization; plasma ion implantation; titanium dental implant; antimicrobial peptide; antimicrobial surface coating; fungi; bacteria
Rights: © 2018 Elsevier Ltd. All rights reserved.
DOI: 10.1016/j.apmt.2018.04.003
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