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Related Experiment Video

Updated: May 24, 2026

Self-Assembly of Hybrid Lipid Membranes Doped with Hydrophobic Organic Molecules at the Water/Air Interface
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Published on: May 1, 2020

Cationic carbosilane dendrimers-lipid membrane interactions.

Dominika Wrobel1, Arkadiusz Kłys, Maksim Ionov

  • 1Department of General Biophysics, University of Lodz, Poland. domwro@biol.uni.lodz.pl

Chemistry and Physics of Lipids
|February 21, 2012
PubMed
Summary

Cationic carbosilane dendrimers (CBS) interact with lipid membranes, increasing rigidity. Interactions are stronger with negatively charged membranes and at higher CBS concentrations, potentially due to dendrimer incorporation.

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Published on: July 10, 2016

Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Biophysics

Background:

  • Lipid bilayers and monolayers are fundamental structures in biological systems.
  • Carbosilane dendrimers are synthetic macromolecules with potential applications in drug delivery and biomaterials.
  • Understanding dendrimer-lipid interactions is crucial for designing advanced nanomaterials.

Purpose of the Study:

  • To investigate the interactions between two types of cationic carbosilane dendrimers (CBS) and lipid bilayers/monolayers.
  • To compare the interaction mechanisms of CBS with Si-O bonds (NN16) versus Si-C bonds (BDBR0011).
  • To evaluate the influence of membrane charge and dendrimer concentration on these interactions.

Main Methods:

  • Liposome-based assays using fluorescence anisotropy to measure changes in membrane fluidity.
  • Study of interactions with lipid monolayers by monitoring surface pressure changes.
  • Utilized two second-generation carbosilane dendrimers: NN16 (Si-O bonds) and BDBR0011 (Si-C bonds).

Main Results:

  • Cationic carbosilane dendrimers interact with both liposomes and lipid monolayers.
  • Interactions are significantly stronger with negatively charged membranes and at higher dendrimer concentrations.
  • Dendrimer addition increased membrane rigidity (decreased fluidity) in liposomes, affecting both hydrophobic and hydrophilic regions.
  • Precipitation was observed in negatively charged liposomes at high dendrimer concentrations.
  • NN16 primarily affected the hydrophilic part of bilayers, while BDBR0011 modified the hydrophobic area.
  • Similar trends were observed with lipid monolayers, with stronger effects on negatively charged lipids.

Conclusions:

  • Cationic carbosilane dendrimers effectively interact with and modify lipid membranes.
  • The nature of the dendrimer's backbone (Si-O vs. Si-C) influences the specific interaction site within the lipid bilayer.
  • Membrane charge and dendrimer concentration are key factors governing the strength and outcome of these interactions.