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Biological membranes show uneven distribution of different types of lipids in the inner and outer layers, resulting in transverse asymmetric membranes. The treatment of the erythrocyte membrane with the enzyme phospholipase confirmed the asymmetric nature of the lipid bilayer. The enzyme hydrolyzes lipids into fatty acids and hydrophilic groups. The phospholipase acts only on the outer layer of the membrane, while the inner layer remains intact. The phospholipase treatment resulted in 80%...
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Phosphoinositides are a group of phospholipids containing a glycerol backbone with two fatty acid chains and a phosphate attached to a myoinositol sugar ring. The inositol head group extends into the cytoplasm, where it is modified by adding phosphate groups to form phosphatidylinositol phosphates or PIPs.
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Lipids are an essential component of all biological membranes. The average lipid content in mammalian membranes is 50%, though it can be as low as 20% in the inner mitochondrial membrane or as high as 80% in the myelin sheath present around the nerve cells.
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Updated: May 13, 2025

Assembly of Cell Mimicking Supported and Suspended Lipid Bilayer Models for the Study of Molecular Interactions
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Insight into black phosphorus interactions with supported lipid bilayers.

Shreehari Kodakkat1, Kalpani A Mirihana1, Rowan Penman1

  • 1School of Science, RMIT University, Melbourne, VIC 3000, Australia.

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|May 3, 2025
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Liquid exfoliated black phosphorus (BP) flakes disrupt lipid bilayers, significantly reducing membrane integrity. This nanomaterial interaction reveals potential for advanced drug delivery systems and antimicrobial therapies.

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Membrane Biophysics

Background:

  • Nanomaterials offer unique properties for biomedical applications like drug delivery and diagnostics.
  • Understanding nanomaterial-biomembrane interactions is crucial for optimizing therapeutic efficacy and safety.
  • Liquid exfoliated black phosphorus (BP) is a novel nanomaterial with potential biomedical applications.

Purpose of the Study:

  • To investigate the interaction between black phosphorus (BP) flakes and lipid bilayers.
  • To determine if BP disrupts lipid bilayer integrity and dynamics.
  • To assess the potential of BP for drug delivery and antimicrobial applications.

Main Methods:

  • Utilized atomic force microscopy (AFM) for topographical and force measurements.
  • Employed force spectroscopy to quantify membrane rupture forces.
  • Conducted molecular dynamics (MD) simulations for atomistic insights into interaction mechanisms.

Main Results:

  • AFM revealed significant destabilization of lipid bilayers upon BP interaction.
  • Force measurements showed a reduction in rupture force by over 50%.
  • MD simulations confirmed BP penetration and disruption of the lipid bilayer.

Conclusions:

  • Black phosphorus (BP) flakes demonstrably disrupt lipid bilayer integrity.
  • BP's membrane-disrupting properties suggest potential for novel drug delivery systems.
  • Findings support BP's utility in developing advanced antimicrobial therapies.