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The effectiveness of antimicrobial agents depends on various factors influencing their ability to eliminate microbial populations. Larger microbial populations require more time for complete eradication, emphasizing the importance of population size analysis when evaluating antimicrobial efficacy.Microbial resistance to antimicrobial agents varies significantly. Highly resilient microorganisms include endospores, gram-negative bacteria, and non-enveloped viruses, while prions are exceptionally...
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Evaluation of Antimicrobial Activities of Nanoparticles and Nanostructured Surfaces In Vitro
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Trends in Bactericidal Nanostructured Surfaces: An Analytical Perspective.

S W M A Ishantha Senevirathne1, Jafar Hasan1, Asha Mathew1

  • 1Centre for Biomedical Technologies, Queensland University of Technology, Brisbane, Queensland 4000, Australia.

ACS Applied Bio Materials
|January 10, 2022
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Summary

Antibacterial nanostructured surfaces (NSS) show promising results, but their efficiency depends on more than just bacterial type. Hydrophobic surfaces and feature aspect ratio are key factors for future designs.

Keywords:
Gram-stain typebacterial motilitybactericidal surfaceshydrophilichydrophobicnanostructured surfacessurface modification

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Area of Science:

  • Materials Science
  • Biotechnology
  • Surface Chemistry

Background:

  • Nanostructured surfaces (NSS) are increasingly studied for antibacterial properties, inspired by natural examples like cicada wings.
  • Numerous parameters influence the bactericidal efficiency (BE) of NSS, but correlations remain elusive.
  • Existing research often oversimplifies BE by focusing solely on bacterial Gram-stain type.

Purpose of the Study:

  • To conduct a meta-analysis of bactericidal NSS literature.
  • To identify trends, research gaps, and key parameters influencing BE.
  • To provide insights for designing next-generation antibacterial surfaces.

Main Methods:

  • Meta-analysis of published studies on bactericidal nanostructured surfaces.
  • Data synthesis to identify correlations between surface parameters and bactericidal efficiency.
  • Literature review to pinpoint under-researched factors.

Main Results:

  • Bacterial Gram-stain type is not the sole determinant of BE; other factors are influential.
  • Hydrophobic NSS exhibit higher BE but are under-investigated compared to hydrophilic counterparts.
  • Surface hydrophobicity and roughness effects are modulated by bacterial Gram-stain type.
  • Nanofeature aspect ratio, alongside diameter, is critical for BE.
  • Silicon-based NSS outperform titanium-based ones, potentially due to fabrication methods.

Conclusions:

  • Future antibacterial NSS design should consider hydrophobicity, aspect ratio, and substrate material.
  • Further research is needed on the impact of cell motility and shape on BE.
  • Hydrophobic NSS represent a promising, yet overlooked, area for antibacterial applications.