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Lipid diffusion in alcoholic environment.

Simona Rifici1, Carmelo Corsaro, Cristina Crupi

  • 1Dipartimento di Fisica e Scienze della Terra, Università degli Studi di Messina , Messina, Italy.

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|July 19, 2014
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Summary
This summary is machine-generated.

High concentrations of butanol and octanol alter the phase behavior and lipid mobility of 1,2-palmitoyl-sn-glycero-3-phosphocholine (DPPC) membranes. Alcohols hinder lipid diffusion in the interdigitated phase and increase activation energy.

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Area of Science:

  • Membrane biophysics
  • Lipid-alcohol interactions
  • Physical chemistry

Background:

  • Understanding lipid-bilayer behavior is crucial for membrane function.
  • Alcohols are known to affect membrane properties, but their impact on lipid mobility at high concentrations and low temperatures is less understood.

Purpose of the Study:

  • To investigate the effects of high butanol and octanol concentrations on the phase behavior and lateral mobility of DPPC lipid bilayers.
  • To characterize the diffusion dynamics of water, alcohol, and lipids within these systems.

Main Methods:

  • Differential scanning calorimetry (DSC) to analyze phase transitions.
  • Pulsed-gradient stimulated-echo (PGSTE) Nuclear Magnetic Resonance (NMR) spectroscopy to measure diffusion coefficients.

Main Results:

  • A decrease in the lipid transition temperature from gel to liquid-crystalline state was observed in the presence of alcohols.
  • Three distinct diffusion processes were identified: water (high), alcohol (intermediate), and lipid (slow).
  • Lipid diffusion was enhanced in the liquid phase but hindered in the interdigitated phase, with limited temperature dependence in the latter.

Conclusions:

  • High alcohol concentrations significantly impact DPPC membrane phase behavior and lipid mobility.
  • Alcohols increase the apparent activation energy for lipid diffusion in both liquid and interdigitated phases.
  • This study provides novel data on lipid lateral diffusion coefficients at low temperatures with long-chain alcohols.