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Loading Capsaicin onto Lipid Bilayers: A Molecular Dynamics Study.

Nathanon Kerdkaen^1,2, Nililla Nisoh^1,2, Jiramate Kitjanon^1,2

¹Department of Physics, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand.

|May 4, 2026

Summary

This summary is machine-generated.

Capsaicin aggregates in water but can permeate lipid bilayers, with POPC bilayers showing higher uptake than DPPC. This research aids in designing capsaicin liposomal delivery systems.

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Area of Science:

Biophysics
Computational Chemistry
Pharmacology

Background:

Capsaicin, a compound from chili peppers, has therapeutic potential but faces bioavailability challenges.
Liposomal encapsulation is explored to improve capsaicin's transport across biological membranes.

Purpose of the Study:

To investigate capsaicin's behavior and interactions within lipid bilayers using molecular dynamics simulations.
To understand how lipid tail saturation affects capsaicin's membrane permeability and localization.

Main Methods:

Molecular dynamics (MD) simulations were performed on capsaicin in POPC and DPPC lipid bilayers.
Simulations included capsaicin in aqueous solution for permeation studies and pre-inserted into bilayers for equilibrium analysis.
Analysis involved mass-density profiles and potential of mean force (PMF) calculations.

Main Results:

Capsaicin forms aggregates in water, with small aggregates permeating lipid bilayers.
POPC bilayers, with unsaturated tails, showed greater capsaicin uptake than DPPC bilayers.
Capsaicin localized within bilayers, with an estimated area of 0.415 ± 0.010 nm² per molecule, and disrupted gel-phase bilayers.

Conclusions:

Capsaicin's membrane interactions are influenced by lipid tail saturation and bilayer phase.
Findings support the development of liposomal formulations for enhanced capsaicin delivery.
Understanding capsaicin-membrane dynamics is crucial for optimizing its pharmaceutical applications.