Polymer-stabilized phospholipid vesicles with a controllable, pH-dependent disassembly mechanism

Area of Science:

• Materials Science
• Polymer Chemistry
• Biotechnology

Background:

• Phospholipid vesicles are crucial for drug delivery and chemical sensing.
• Developing stable yet degradable vesicles remains a challenge.

Purpose of the Study:

• To create robust phospholipid vesicles stabilized by an acid-labile, cross-linked polymer network.
• To enable controlled degradation of vesicles for specific applications.

Main Methods:

• Formation of a polymer network within the inner lamella of phospholipid bilayers using 2,2-di(methacryloyloxy-1-ethoxy)propane (DMOEP) and butyl methacrylate (BMA).
• Investigation of vesicle stability under various conditions (surfactant concentration, vacuum, pH) using transmission electron microscopy and dynamic light scattering.
• Analysis of polymer solubility in tetrahydrofuran (THF) as a function of pH.

Main Results:

• Vesicles demonstrated enhanced stability in high surfactant concentrations and vacuum at elevated pH.
• Exposure to acidic pH rapidly reduced vesicle stability, with complete degradation within 24 hours.
• Isolated polymers exhibited pH-dependent solubility in THF.

Conclusions:

• A facile method for preparing transiently stabilized phospholipid vesicles was established.
• The acid-labile polymer network allows for controlled vesicle destabilization and degradation.
• These vesicles show promise for advanced drug delivery, chemical sensing, and improved physiological clearance.