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Micrometer-sized TPM emulsion droplets with surface-mobile binding groups.

Casper van der Wel1, Guido L van de Stolpe1, Ruben W Verweij1

  • 1Soft Matter Physics, Huygens-Kamerlingh Onnes Laboratory, Leiden University, PO Box 9504, 2300 RA Leiden, Netherlands.

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|January 30, 2018
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Summary
This summary is machine-generated.

Researchers used polymerizable micro-emulsions of 3-(trimethoxysilyl)propyl methacrylate (TPM) as a novel platform for creating model lipid membranes. This approach enables the assembly of particles onto droplets, with mobility limited by the underlying polymer network.

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Area of Science:

  • Materials Science
  • Biophysics
  • Nanotechnology

Background:

  • Lipid-coated colloids are crucial for studying membrane processes, drug delivery, biosensing, and self-assembly.
  • DNA oligomers with hydrophobic anchors enable self-assembly by integrating into lipid membranes.
  • Lateral mobility of DNA linkers on particles facilitates the creation of flexible structures.

Purpose of the Study:

  • To investigate polymerizable micro-emulsions of 3-(trimethoxysilyl)propyl methacrylate (TPM) as a platform for model lipid membranes.
  • To functionalize these droplets with proteins and DNA oligonucleotides.
  • To explore particle assembly on these functionalized droplets.

Main Methods:

  • Production of TPM micro-emulsions with controlled size and curvature.
  • Functionalization of droplets with lipids, NeutrAvidin proteins, and DNA oligonucleotides.
  • Fluorescence recovery after photobleaching (FRAP) to assess molecular mobility.
  • Particle assembly using avidin-biotin interactions and DNA hybridization.

Main Results:

  • TPM droplets support lipid monolayers and can be functionalized with proteins and DNA.
  • Lipids, NeutrAvidin proteins, and DNA oligonucleotides exhibit surface mobility on TPM droplets.
  • Assembled micron-sized particles on droplets are immobile, unlike the individual surface molecules.
  • The heterogeneous oligomer network of emulsified TPM restricts collective linker motion.

Conclusions:

  • TPM micro-emulsions provide a versatile platform for creating model lipid membranes with tunable properties.
  • The polymer network structure influences the mobility of surface-bound components and assembled structures.
  • This system offers potential for developing novel self-assembling materials and functional interfaces.