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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
PubMed
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.

Keywords:
antibacterial propertiesbiopolymercopper compositespoly-L-lactic acid (PLLA)surface morphologywrinkle structure

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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.