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Using Neutron Reflectometry to Characterize Antimicrobial Protein Surface Coatings.

Peter W Akers1, Andrew J Dingley2,3, Simon Swift4

  • 1School of Chemical Sciences, University of Auckland , Private Bag 92019, Auckland 1142, New Zealand.

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Summary

Functionalized surfaces with antimicrobial proteins were studied. Hydrated APTES-PEG-protein films showed unique structures and significant antimicrobial activity against bacteria.

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Area of Science:

  • Biomaterials science
  • Surface chemistry
  • Microbiology

Background:

  • Designing functionalized surfaces for biomedical applications requires understanding protein-substrate interactions at the molecular level.
  • Antimicrobial protein films are crucial for preventing microbial contamination in medical devices and implants.

Purpose of the Study:

  • To characterize the structure of surface-attached antimicrobial protein films using neutron reflectometry (NR).
  • To correlate structural characteristics with antimicrobial bioactivity against common bacteria.
  • To investigate the role of poly(ethylene glycol) (PEG) spacers in protein immobilization and film properties.

Main Methods:

  • Neutron reflectometry (NR) was employed to analyze the nanostructure of protein films on poly(methyl methacrylate) (PMMA) and 3-aminopropyltriethoxysilane (APTES) substrates.
  • Antimicrobial activity was assessed using an adaptation of the Japanese Industrial Standard Test JIS Z 2801.
  • Hydramacin-1 (HM-1) and lysozyme were covalently attached, with and without PEG spacers.

Main Results:

  • APTES-PEG-protein films exhibited a unique structure with a highly hydrated layer (80% water) beneath the protein.
  • These hydrated APTES-PEG-protein films were the only ones to display significant antimicrobial activity against Escherichia coli and Bacillus subtilis.
  • Differences in PEG layer thickness between APTES and PMMA films influenced antimicrobial properties.

Conclusions:

  • The high hydration content of APTES-PEG-protein films is critical for their antimicrobial efficacy.
  • Surface structure, particularly hydration and PEG layer characteristics, dictates the bioactivity of immobilized antimicrobial proteins.
  • Neutron reflectometry is a powerful tool for correlating nanoscale structure with the functional performance of biomaterial surfaces.