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Updated: May 28, 2026

Realistic Membrane Modeling Using Complex Lipid Mixtures in Simulation Studies
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Published on: September 1, 2023

Molecular dynamics simulation of hydrated DPPC monolayers using charge equilibration force fields.

Timothy R Lucas1, Brad A Bauer, Joseph E Davis

  • 1Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, USA.

Journal of Computational Chemistry
|October 15, 2011
PubMed
Summary
This summary is machine-generated.

Molecular dynamics simulations using charge equilibration (CHEQ) force fields accurately predict DPPC-water monolayer surface tension. Explicit polarization modeling improves electrostatic predictions at interfaces.

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Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
10:52

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics

Published on: April 12, 2019

Area of Science:

  • Computational chemistry
  • Physical chemistry
  • Materials science

Background:

  • Lipid monolayers are crucial in biological membranes and interfacial phenomena.
  • Accurate simulation of lipid-water interfaces requires reliable force fields that capture electronic polarization.

Purpose of the Study:

  • To evaluate the performance of charge equilibration (CHEQ) force fields for simulating a dipalmitoylphosphatidylcholine (DPPC)-water monolayer.
  • To assess the impact of explicitly modeled electronic polarization on interfacial properties.

Main Methods:

  • Molecular dynamics (MD) simulations were performed on a model DPPC-water monolayer.
  • Charge equilibration (CHEQ) force fields were employed to account for electronic polarization.
  • Surface pressure and surface tension were calculated at 323 K.

Main Results:

  • The predicted surface pressure was 22.92 ±1.29 dyne/cm, slightly below experimental values.
  • The predicted surface tension was 42.35 ±1.16 dyne/cm, closely matching the experimental value of 40.9 dyne/cm.
  • The predicted monolayer-water potential difference was 0.64 ±0.02 Volts, an improvement over fixed-charge models but still overestimating experimental data.

Conclusions:

  • CHEQ force fields provide accurate predictions for surface tension of DPPC-water monolayers.
  • Explicitly modeled polarization effects improve the description of interfacial electrostatics.
  • Further refinement of polarization models may be needed for precise electrostatic potential predictions.