Journal
NANOSCALE
Volume 11, Issue 14, Pages 6905-6915Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8nr09802f
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Funding
- University of Manitoba through the UCRP program [45587]
- Research Manitoba Mid-Career Operating Grant
- Canada Foundation for Innovation
- Natural Sciences and Engineering Research Council of Canada [RGPIN-2018-05012, RGPIN/04922-2014]
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A main feature of biofilms is the self-produced extracellular polymeric substances (EPSs) that act as a protective shield, preventing biocide penetration. We use magnetic iron oxide nanoparticles (MNPs) in combination with magnetic fields to damage the biofilm matrix and cause detachment. A Methicillin-resistant Staphylococcus aureus (MRSA) biofilm strain is used to demonstrate the efficacy of the methodology with different sizes and concentrations of MNPs under AC and DC applied field conditions. We achieve up to a nearly 5 log(10) reduction in biofilm bacteria after treatment with 30 mg mL(-1) of 11 nm MNPs using a magnetic field. The MNPs cause significant mechanical disruption to the matrix and lead to biofilm dispersal. In addition, using magnetic hyperthermia further affects biofilm damage.
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