The Effect of Ethanol on Lipid Nanoparticle Stabilization from a Molecular Dynamics Simulation Perspective

Area of Science:

• Biochemistry
• Materials Science
• Computational Chemistry

Background:

• Lipid nanoparticles (LNPs) are advanced delivery vehicles for genetic materials and vaccines.
• LNP formulation involves mixing nucleic acids in buffer with lipids dissolved in ethanol.
• Ethanol, while essential for LNP formation, can impact their stability.

Purpose of the Study:

• To investigate the physicochemical effects of ethanol on lipid nanoparticle (LNP) structure and stability.
• To understand the dynamic impact of ethanol on LNPs using molecular dynamics simulations.

Main Methods:

• Molecular dynamics (MD) simulations were employed to model LNP-ethanol interactions.
• Analysis included root mean square deviation (RMSD), solvent-accessible surface area (SASA), electron density, and radial distribution function (RDF).
• Hydrogen bond (H-bond) profiles were analyzed to track solvent penetration.

Main Results:

• Ethanol was found to destabilize LNP structures over time, evidenced by increased RMSD values.
• Changes in SASA, electron density, and RDF indicated ethanol's adverse effect on LNP stability.
• Ethanol was observed to penetrate LNPs before water molecules, as shown by H-bond analysis.

Conclusions:

• Immediate removal of ethanol during LNP production is critical for ensuring the stability of lipid-based systems.
• Understanding ethanol's destabilizing effects is key for optimizing LNP formulation and storage.
• These findings provide crucial insights for the development of stable and effective LNP-based therapeutics.