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High-throughput Identification of Bacteria Repellent Polymers for Medical Devices
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Copper-PLLA-Based Biopolymer Wrinkle Structures for Enhanced Antibacterial Activity.
Petr Slepička1, Iva Labíková1, Bára Frýdlová1
1Department of Solid State Engineering, University of Chemistry and Technology Prague, 166 28 Prague, Czech Republic.
Polymers
|August 28, 2025
Summary
This study developed a novel antibacterial surface by combining copper with wrinkled poly-L-lactic acid (PLLA) structures. The new Cu-PLLA material effectively killed bacteria, offering a promising solution for biomedical applications.
Area of Science:
- Materials Science
- Biomedical Engineering
- Microbiology
Background:
- Rising antibiotic resistance necessitates advanced antibacterial surfaces.
- Conventional antibacterial agents face challenges with diminishing efficacy.
- Biopolymer-metal composites offer potential for novel antimicrobial solutions.
Purpose of the Study:
- To develop and characterize a novel antibacterial surface combining copper with engineered topography on a biopolymer.
- To evaluate the antibacterial efficacy of the developed surface against common bacterial strains.
- To explore the synergistic mechanisms underlying the enhanced bactericidal activity.
Main Methods:
- Fabrication of copper-poly-L-lactic acid (Cu-PLLA) composite using sputtering and thermal treatment.
- Surface characterization via scanning electron microscopy (SEM), atomic force microscopy (AFM), and energy-dispersive X-ray spectroscopy (EDS).
- Antibacterial assessment using colony count reduction assays against Escherichia coli and Staphylococcus aureus.
Main Results:
- Hierarchical wrinkle-like micro- and nanostructures were successfully formed on the Cu-PLLA surface.
- The Cu-PLLA wrinkled surfaces exhibited significantly enhanced bactericidal activity compared to controls.
- Synergistic effects of mechanical disruption and copper toxicity contributed to bacterial killing.
Conclusions:
- Engineered topography on biopolymer-metal hybrid surfaces enhances antibacterial properties.
- The developed Cu-PLLA wrinkled surface is a promising candidate for next-generation antibacterial materials.
- This approach offers a viable strategy for combating antibiotic-resistant bacteria in biomedical settings.
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