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Fluorescence Recovery after Merging a Droplet to Measure the Two-dimensional Diffusion of a Phospholipid Monolayer
Published on: October 15, 2015
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Reversible Phase Transitions in the Phospholipid Monolayer.
1Department of Mechanical Engineering , University of Hawaii at Manoa , Honolulu , Hawaii 96822 , United States.
Langmuir : the ACS Journal of Surfaces and Colloids
|July 4, 2018
Summary
This study demonstrates that two-dimensional surface phase transitions in phospholipid monolayers are reversible. Using constrained drop surfactometry, researchers confirmed the absence of hysteresis in dipalmitoylphosphatidylcholine (DPPC) monolayer phase behavior.
Area of Science:
- Surface science
- Soft matter physics
- Biophysics
Background:
- Phospholipid monolayer polymorphism is crucial for understanding surface thermodynamics, soft matter physics, and biomembranes.
- Traditional Langmuir film balances have limitations in studying the reversibility of 2D surface phase transitions due to experimental artifacts like film leakage.
Purpose of the Study:
- To develop a novel method for studying reversible 2D surface phase transitions in phospholipid monolayers.
- To investigate the reversibility of phase transitions in dipalmitoylphosphatidylcholine (DPPC) monolayers using a new technique.
Main Methods:
- Development of constrained drop surfactometry, a leakage-proof technique for 2D surface phase transition studies.
- Application of the method to dipalmitoylphosphatidylcholine (DPPC) monolayers to analyze isothermal and isobaric phase transitions.
Main Results:
- Compression/expansion isotherms and heating/cooling isobars of DPPC monolayers showed complete superposition without hysteresis, indicating reversibility.
- Microscopic lateral structures of DPPC monolayers also exhibited reversible behavior during isothermal and isobaric processes.
Conclusions:
- Two-dimensional surface phase transitions in phospholipid monolayers are reversible, aligning with bulk material behavior.
- Findings enhance understanding of surface thermodynamics, phase change materials, and biophysical aspects of membranes and pulmonary surfactants.
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