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Developing Antibacterial Nanocrystalline Cellulose Using Natural Antibacterial Agents.

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Sterically stabilized nanocrystalline cellulose (SNCC) effectively immobilizes antibacterial agents like lysozyme and nisin. This nanocellulose conjugate maintains antibacterial activity over time, showing promise for wound dressings.

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Antimicrobial Research

Background:

  • Developing novel antimicrobial materials is crucial for combating bacterial infections.
  • Nanocellulose offers a versatile platform for drug delivery and surface functionalization.
  • Lysozyme and nisin are well-established antibacterial proteins with therapeutic potential.

Purpose of the Study:

  • To immobilize the antibacterial agents lysozyme and nisin onto sterically stabilized nanocrystalline cellulose (SNCC).
  • To evaluate the efficacy of SNCC-conjugated antibacterials against Bacillus subtilis and Staphylococcus aureus.
  • To assess the long-term stability and activity of immobilized antibacterials.

Main Methods:

  • Functionalization of hairy nanocrystalline cellulose with aldehyde groups to create SNCC.
  • Green immobilization of lysozyme and nisin onto SNCC without linkers.
  • Characterization using X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy.
  • Assessment of antibacterial efficacy through bacterial growth, cell viability, and biofilm assays.

Main Results:

  • Successful attachment of lysozyme and nisin onto SNCC confirmed by spectroscopy.
  • Immobilized antibacterials showed sustained activity against S. aureus, unlike free nisin.
  • Minimum inhibitory concentration of conjugated nanocellulose was higher than free agents, as expected.
  • Immobilization prevented nisin deactivation or bacterial resistance development over 24 hours.

Conclusions:

  • SNCC provides an effective platform for immobilizing antibacterial proteins.
  • Immobilization enhances the long-term stability and efficacy of lysozyme and nisin.
  • Antibacterial SNCC is a promising candidate for developing advanced wound dressings.