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Dynamic morphologies of microscale droplet interface bilayers.

Prachya Mruetusatorn1, Jonathan B Boreyko, Guru A Venkatesan

  • 1Department of Biosystems Engineering & Soil Science, The University of Tennessee, Knoxville, Tennessee 37996, USA.

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Summary
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Microscale droplet interface bilayers (μDIBs) exhibit dynamic morphological changes during evaporation. Researchers identified three distinct behaviors: buckling and fission, uniform shrinking, and stretching and unzipping, revealing coupled lipid interface dynamics.

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Area of Science:

  • Biophysics
  • Materials Science
  • Microfluidics

Background:

  • Droplet interface bilayers (DIBs) are synthetic membranes used to study cellular membrane dynamics.
  • The unique dynamic properties of DIBs remain largely unexplored.
  • Microfluidic platforms offer precise control for generating and manipulating DIBs.

Purpose of the Study:

  • To investigate the dynamic morphological changes of microscale droplet interface bilayers (μDIBs) during droplet evaporation.
  • To characterize different dynamic behaviors based on varying initial conditions.
  • To understand the underlying mechanisms of coupled lipid interface dynamics in μDIBs.

Main Methods:

  • Generation of femtoliter-volume water droplets in microfluidic oil channels to form μDIBs.
  • Controlled evaporation of water droplets within the microfluidic system.
  • Systematic variation of initial experimental conditions to observe morphological responses.
  • Characterization of μDIB morphology using microscopy and dynamic analysis.

Main Results:

  • Identified three distinct classes of dynamic morphology in μDIBs: buckling and fission, uniform shrinking, and stretching and unzipping.
  • Buckling and fission occurred with the lipid-out method, where lipids conserved mass, leading to bilayer growth, confinement, and vesicle fission.
  • Uniform shrinking was observed with the lipid-in method, involving lipid transfer into internal vesicles.
  • Stretching and unzipping resulted from pinned droplets, leading to bilayer separation.

Conclusions:

  • Evaporation-induced shrinking drives distinct dynamic morphologies in μDIBs.
  • The method of lipid incorporation (lipid-in vs. lipid-out) significantly influences μDIB dynamics.
  • Understanding these dynamics is crucial for exploiting μDIBs in synthetic biology and membrane studies.
  • Findings provide insights into the behavior of coupled lipid interfaces under dynamic conditions.