Liposomal stabilization using a sugar-based, PEGylated amphiphilic macromolecule.

Area of Science:

• Colloidal chemistry
• Materials science
• Biotechnology

Background:

• Conventional liposomes face challenges in clinical use due to poor stability.
• Enhancing liposome stability is crucial for effective drug delivery systems.

Purpose of the Study:

• To evaluate a novel sugar-based, PEGylated amphiphilic macromolecule (AM) as a stabilizer for dipalmitoyl phosphatidylcholine (DPPC)-based liposomes.
• To assess the impact of AM on liposome colloidal and biological stability.

Main Methods:

• Preparation of DPPC-based liposomes with and without the AM stabilizer.
• Assessment of colloidal stability through particle size measurements over time.
• Evaluation of membrane permeability in the presence of serum.
• Inhibition of phagocytosis by macrophages as a measure of biological stability.

Main Results:

• AM-stabilized liposomes demonstrated enhanced colloidal stability, maintaining size for 5 weeks without aggregation.
• AM significantly reduced liposome membrane permeability, even in serum.
• AM-stabilized liposomes showed improved biological stability by inhibiting macrophage phagocytosis.
• The stabilizing effect of AM was comparable to conventional PEG-modified phosphatidylethanolamine.

Conclusions:

• The sugar-based amphiphilic macromolecule (AM) is a highly effective stabilizer for liposomes.
• AM enhances both colloidal and biological stability, addressing key limitations of conventional liposomes.
• AM represents a promising agent for advanced colloidal drug delivery applications.