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Encapsulants Affect Liposome Surface Interactions with Biological Systems.

Clemens Spitzenberg1, Christoph Bruckschlegel1, Ferdinand Holzhausen1

  • 1Institut für Analytische Chemie, Chemo- und Biosensorik, Universität Regensburg, D-93053, Regensburg, Germany.

Small (Weinheim an Der Bergstrasse, Germany)
|June 19, 2025
PubMed
Summary
This summary is machine-generated.

Encapsulated dyes within liposomes significantly alter their outer surface chemistry and biological interactions, impacting complement protein binding. Careful selection of both lipids and encapsulated molecules is crucial for liposome applications.

Keywords:
SAXScomplement assayfluorescenceliposomesspectroscopy

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Area of Science:

  • Nanotechnology
  • Biochemistry
  • Materials Science

Background:

  • Liposomes are versatile nanostructures with lipid bilayers and aqueous cores, widely used in drug delivery and diagnostics.
  • While lipid composition influences liposome properties, the impact of encapsulated molecules on surface characteristics is often overlooked.
  • Interface activity of entrapped substances can modify liposome behavior.

Purpose of the Study:

  • To investigate how different encapsulated dyes affect liposome surface chemistry and interactions.
  • To determine the influence of dyes on liposome structure and biological system interactions.
  • To highlight the importance of encapsulant choice in liposome formulation.

Main Methods:

  • Encapsulation of IR-783, sulforhodamine B (SRB), and 1,3,6,8-pyrenetetrasulfonic acid (PTSA) in liposomes.
  • Spectroscopic analysis and small-angle X-ray scattering (SAXS) to study liposome structure and dye-membrane interactions.
  • Incubation of liposomes with serum to assess complement protein interactions.

Main Results:

  • IR-783 interacts with the liposome membrane, significantly altering bilayer structure.
  • SRB shows potential adsorption to liposome surfaces at higher concentrations.
  • PTSA does not interact with the liposome bilayer.
  • Complement protein interactions with liposome surfaces vary based on the encapsulated dye, not solely lipid composition.

Conclusions:

  • Encapsulated dyes can significantly modify liposome surface chemistry and biological interactions.
  • The choice of encapsulated molecule is as critical as lipid composition for controlling liposome behavior in biological systems.
  • Further research should consider the interplay between lipid and encapsulant for optimized liposome design.