Prolonged and continuous antibacterial and anti-biofilm activities of thin films embedded with gentamicin-loaded mesoporous silica nanoparticles

Tasnuva Tamanna, Cornelia Barbara Landersdorfer, Hooi Jun Ng, Jurgen Bulitta, Peter Wood, Aimin Yu

Research output: Contribution to journalArticleResearchpeer-review

3 Citations (Scopus)

Abstract

The application of mesoporous silica nanoparticles (MSNs) in drug delivery systems has become highly attractive since the early 2000s. In this study, thin-film coatings embedded with gentamicin-loaded mesoporous silica nanoparticles (MSN-G) were prepared to provide antibacterial and anti-biofilm activity over a prolonged period of time. The prolonged and continuous activity of MSN-G films against Staphylococcus aureus throughout the release period was studied via two methods, namely, (1) disc diffusion of released gentamicin and (2) by shifting the MSN-G thin film to a new agar plate at certain time intervals. The expansion of the inhibition zone from 4.6 ± 0.5 to 9.7 ± 0.5 mm as caused by the released fraction of gentamicin from the first week to the eighth week indicated the controlled and slow release behaviour of loaded antibiotic and prolonged antibacterial efficacy of these films. In addition, the appearance of an inhibition zone after each shifting of the film to a new agar plate was persistent up to 103 days which confirmed that thin films successively prevented bacterial growth over a long period of time. In addition, the anti-biofilm activity of MSN-G films was evaluated by imaging bacterial cells attachment via confocal laser scanning microscopy and scanning electron microscopy. Remarkably, the anti-biofilm performance remained active for more than 2 months. To the best of our knowledge, such a slow and controlled release of antibiotic from nanoparticle embedded thin films with uninterrupted, continuous, and prolonged antibacterial effect for more than 2 months has not been reported yet.

Original languageEnglish
Pages (from-to)1471-1482
Number of pages12
JournalApplied Nanoscience
Volume8
Issue number6
DOIs
Publication statusPublished - 1 Aug 2018

Keywords

  • Antibacterial activity
  • Gentamicin
  • Mesoporous silica nanoparticles
  • S. aureus
  • Thin-film drug delivery systems

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