Journal
JOURNAL OF MATERIALS CHEMISTRY B
Volume 2, Issue 32, Pages 5168-5177Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4tb00503a
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Funding
- Luxembourgish agency Fonds National de la Recherche [FNR-INER/MAT/11/01]
- DG06-Region Wallone agency
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Here, we describe a robust process aiming at conferring antibacterial properties on stainless steel through the covalent grafting of nisin, a natural antimicrobial peptide, onto a functional plasma thin film deposited by an atmospheric pressure dielectric barrier discharge process. The three different steps of the procedure, namely the deposition of a carboxyl rich thin layer, the surface activation by using a zero-length crosslinking agent and the nisin immobilisation, are reported and thoroughly characterised. A correlation between the carboxylic group surface concentration and the surface roughness onto the antibacterial properties of the layers is evidenced. Finally, IS analyses appear as a powerful analytical tool allowing us to validate the different chemical surface modifications, to confirm the relevance of the activation step to achieve a stable and homogenous peptide grafting over all the surfaces, as well as to investigate the secondary structure of immobilized peptides.
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