Related Experiment Video
Updated: Oct 9, 2025
10:43
Single-Molecule Diffusion and Assembly on Polymer-Crowded Lipid Membranes
Published on: July 19, 2022
2.5K
Distinctive Formation of PEG-Lipid Nanopatches onto Solid Polymer Surfaces Interfacing Solvents from Atomistic
James Andrews1, Estela Blaisten-Barojas1
1Center for Simulation and Modeling (formerly, Computational Materials Science Center) and Department of Computational and Data Sciences, George Mason University, Fairfax, Virginia 22030, United States.
The Journal of Physical Chemistry. B
|December 22, 2021
Summary
Atomistic simulations reveal how solvents interact with poly(lactic acid-co-glycolic acid) (PLGA). Ethyl acetate covers the PLGA surface, while water segregates, influencing DSPE-PEG nanopatch formation for drug delivery.
Area of Science:
- Materials Science
- Computational Chemistry
- Biomedical Engineering
Background:
- Poly(lactic acid-co-glycolic acid) (PLGA) is a key biomaterial in drug delivery.
- Understanding solvent interactions at the PLGA interface is crucial for nanoparticle formulation.
- DSPE-PEG is often used to stabilize PLGA nanoparticles.
Purpose of the Study:
- To investigate the atomistic interactions at the PLGA-solvent interface using large-scale simulations.
- To explore the formation mechanism of DSPE-PEG nanopatches on PLGA surfaces.
- To elucidate how solvent properties influence nanopatch morphology and adhesion.
Main Methods:
- Large-scale atomistic simulations were employed.
- All-atom Molecular Dynamics simulations were used to study DSPE-PEG deposition.
- Interfacial properties and macromolecular assembly were analyzed.
Main Results:
- Solvent interactions at the PLGA interface are dominated by Coulomb forces for water and dispersive forces for ethyl acetate.
- Ethyl acetate preferentially covers the PLGA surface, leading to liquid-phase separation.
- DSPE-PEG forms nanopatches on the PLGA surface, with droplet-like shapes at the water interface and flattened shapes at the ethyl acetate interface.
- Dispersive forces drive nanopatch adhesion, while electrostatic forces stabilize the surrounding solvent.
Conclusions:
- The study provides insights into the mechanism of PEG-lipid nanopatch formation on PLGA surfaces.
- Solvent choice significantly impacts nanopatch morphology and wetting behavior.
- The findings offer a generalizable mechanism for tailoring asymmetric PLGA nanoparticles for drug delivery applications.
