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PDMS Device Fabrication and Surface Modification
Published on: October 1, 2007
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Exploiting Covalent, H-Bonding, and π-π Interactions to Design Antibacterial PDMS Interfaces That Load and Release
Ioritz Sorzabal-Bellido1, Yuri A Diaz-Fernandez1, Arturo Susarrey-Arce1
1Open Innovation Hub for Antimicrobial Surfaces, Surface Science Research Centre, Department of Chemistry, and National Biofilm Innovation Centre, University of Liverpool, Liverpool L69 3BX, U.K.
ACS Applied Bio Materials
|January 13, 2022
Summary
Researchers developed smart antimicrobial surfaces using salicylic acid (SA) on polydimethylsiloxane (PDMS) for medical devices. This novel functionalization effectively prevents bacterial colonization and biofilm formation, enhancing device safety.
Area of Science:
- Materials Science
- Biomedical Engineering
- Surface Chemistry
Background:
- Bacterial colonization on medical devices poses a significant risk.
- Polydimethylsiloxane (PDMS) is a common material in medical devices but susceptible to bacterial adhesion.
- Antimicrobial surfaces are crucial for preventing infections associated with medical implants and devices.
Purpose of the Study:
- To functionalize polydimethylsiloxane (PDMS) surfaces with salicylic acid (SA) to create smart antimicrobial surfaces.
- To investigate the molecular interactions at the functionalized interface for controlled biocide release.
- To evaluate the efficacy of the SA-functionalized PDMS against common bacterial pathogens.
Main Methods:
- Grafting of bifunctional silane linkers onto PDMS surfaces.
- Non-covalent attachment of salicylic acid (SA) to the silane linkers.
- Surface characterization using spectroscopy (ATR-FTIR, Raman, XPS) and density functional theory (DFT) calculations.
- Antimicrobial testing against *Escherichia coli*, *Staphylococcus aureus*, and *Staphylococcus epidermidis*.
Main Results:
- Successful covalent grafting of silane linkers and subsequent soft intermolecular interactions with SA.
- Formation of 1:1 SA-linker complexes acting as nucleation sites for enhanced SA uptake via H-bonding and π-π stacking.
- Demonstrated significant antimicrobial activity, including a log 6 reduction in planktonic bacteria and effective anti-biofilm properties.
Conclusions:
- A rational design strategy enables the creation of SA-functionalized PDMS with enhanced antimicrobial properties.
- The interface chemistry allows for reversible loading and release of the biocide, ensuring sustained antimicrobial action.
- These smart antimicrobial surfaces offer a promising approach to reduce bacterial infections in medical devices.
