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Atomic Force Microscopy Imaging and Force Spectroscopy of Supported Lipid Bilayers

Atomic Force Microscopy Imaging and Force Spectroscopy of Supported Lipid Bilayers

Published on: July 22, 2015

Direct visualization of phase transition dynamics in binary supported phospholipid bilayers using imaging

Alan W Szmodis¹, Craig D Blanchette², Andrey A Levchenko³

¹Dept. of Applied Science, University of California, Davis, CA USA. anparikh@ucdavis.edu and Biophysics Graduate Group, University of California, Davis, CA, USA.

|September 10, 2020

Summary

This summary is machine-generated.

Selective gelation in phospholipid bilayers triggers phase transitions, creating defect chains and fractal domains. Imaging ellipsometry reveals small, weakly cooperative molecular clusters during this process.

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Area of Science:

Materials Science
Biophysics
Surface Chemistry

Background:

Phospholipid bilayers are crucial in biological membranes and biomaterials.
Understanding phase transitions in these films is key to controlling their properties.
Selective gelation offers a method to induce controlled changes in bilayer structure.

Purpose of the Study:

To investigate the dynamics of phase transitions induced by selective gelation in binary phospholipid bilayers.
To characterize the morphological changes and molecular behavior during gelation.
To demonstrate the utility of imaging ellipsometry for studying interfacial film dynamics.

Main Methods:

Utilized imaging ellipsometry for in situ, label-free, and non-contact observation.
Studied binary supported phospholipid bilayers undergoing selective gelation of one component.
Performed time-lapse analysis of ellipsometric images to track dynamics.

Main Results:

Observed the emergence of extended defect chains due to changes in molecular area.
Identified fractal-like domains indicative of weak line tension.
Revealed that molecular clusters undergoing gelation consist of 4-20 molecules, suggesting weak cooperativity.

Conclusions:

Imaging ellipsometry is effective for large-area, dynamic studies of interfacial films.
Selective gelation induces distinct morphological changes in phospholipid bilayers.
The study provides insights into the molecular mechanisms of phase transitions in lipid systems.