Publication Type Journal Article
Title Evaluation of EGCG Loading Capacity in DMPC Membranes
Authors Filipa Pires Vananelia P. N. Geraldo Barbara Rodrigues Antonio de Granada-Flor R. F. M. de Almeida Osvaldo N. Oliveira Jr Bruno L. Victor Miguel Machuqueiro Maria Raposo
Groups MPPM
Journal LANGMUIR
Year 2019
Month May
Volume 35
Number 20
Pages 6771-6781
Abstract Catechins are molecules with potential use in different pathologies such as diabetes and cancer, but their pharmaceutical applications are often hindered by their instability in the bloodstream. This issue can be circumvented using liposomes as their nanocarriers for in vivo delivery. In this work, we studied the molecular details of (-)-epigallocatechin-3-gallate (EGCG) interacting with 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC) monolayer/bilayer systems to understand the catechin loading ability and liposome stability, using experimental and computational techniques. The molecular dynamics simulations show the EGCG molecules deep inside the lipid bilayer, positioned below the lipid ester groups, generating a concentration-dependent lipid condensation. This effect was also inferred from the surface pressure isotherms of DMPC monolayers. In the polarization-modulated infrared reflection absorption spectra assays, the predominant effect at higher concentrations of EGCG (e.g., 20 mol \%) was an increase in lipid tail disorder. The steady-state fluorescence data confirmed this disordered state, indicating that the catechin-induced liposome aggregation outweighs the condensation effects. Therefore, by adding more than 10 mol \% EGCG to the liposomes, a destabilization of the vesicles occurs with the ensuing release of entrapped catechins. The loading capacity for DMPC seems to be limited by its disordered lipid arrangements, typical of a fluid phase. To further increase the clinical usefulness of liposomes, lipid bilayers with more stable and organized assemblies should be employed to avoid aggregation at large concentrations of catechin.
DOI http://dx.doi.org/10.1021/acs.langmuir.9b00372
ISBN
Publisher
Book Title
ISSN 0743-7463
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Conference Name
Bibtex ID ISI:000469291500030
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