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Highly Efficient Antibacterial Surfaces Based on Bacterial/Cell Size Selective Microporous Supports.

Nelson Vargas-Alfredo1, Ana Santos-Coquillat2, Enrique Martínez-Campos2

  • 1Polymer Functionalization Group (FUPOL), Instituto de Ciencia y Tecnología de Polímeros (ICTP), Consejo Superior de Investigaciones Científicas (CSIC) , C/Juan de la Cierva 3, 28006 Madrid, Spain.

ACS Applied Materials & Interfaces
|November 14, 2017
PubMed
Summary

This study developed novel antibacterial surfaces using size-selective micropores. These surfaces effectively kill bacteria while remaining safe for mammalian cells, improving biocompatibility.

Keywords:
PDMAEMAantibacterial polymer surfacesbreath figurescell adhesionporous materialsquaternized

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Area of Science:

  • Materials Science
  • Biotechnology
  • Surface Chemistry

Background:

  • Developing antibacterial materials is crucial for preventing infections.
  • Existing antibacterial strategies often lack selectivity, leading to cytotoxicity in mammalian cells.
  • Surface functionalization offers a promising route to create selective antimicrobial properties.

Purpose of the Study:

  • To fabricate efficient antibacterial substrates with selectivity for bacteria over mammalian cells.
  • To leverage size differences between bacteria and mammalian cells for targeted antimicrobial action.
  • To create biocompatible materials with reduced adverse cytotoxic effects.

Main Methods:

  • Fabrication of well-ordered functional microporous substrates (3-5 μm) using the breath figures approach.
  • Utilizing polymer blends of polystyrene and block copolymers (polystyrene-b-poly(dimethylaminoethyl methacrylate) (PDMAEMA) or quaternized PDMAEMA).
  • Selective functionalization of the pore cavity with antimicrobial agents while keeping the surface unaffected.

Main Results:

  • Obtained porous surfaces with a narrow size distribution and enrichment of PDMAEMA or quaternized PDMAEMA within the pores.
  • Demonstrated selective contact of bacteria with inner pore functionalities due to size differences (bacteria: 1-4 μm, mammalian cells: >20 μm).
  • Quaternized PDMAEMA-functionalized surfaces exhibited excellent antimicrobial activity.

Conclusions:

  • The developed microporous substrates offer efficient and selective antibacterial activity.
  • The size-exclusion strategy enhances biocompatibility by minimizing mammalian cell interaction with antimicrobial functionalities.
  • This approach provides a promising platform for developing next-generation antibacterial materials.