pH-Responsive Vesicle Formation by PEGylated Cholesterol Derivatives: Physicochemical Characterization, Stability,...

Area of Science:

• Biomaterials Science
• Nanotechnology
• Drug Delivery Systems

Background:

• PEGylated vesicles are effective blood-persistent drug delivery systems (DDSs).
• Stimuli-responsive carriers, particularly pH-responsive ones, are crucial for targeted cancer chemotherapy.
• Existing DDSs require further development for enhanced efficacy and biocompatibility.

Purpose of the Study:

• To design and synthesize novel pH-responsive amphiphiles for drug delivery.
• To characterize the physicochemical properties of the self-assembled nanoaggregates.
• To evaluate the potential of these vesicles as biocompatible DDSs for cancer treatment.

Main Methods:

• Synthesis of pH-responsive amphiphiles using cholesterol, poly(ethylene glycol), and l-cysteine.
• Spontaneous vesicle formation in aqueous solutions.
• Characterization using spectroscopic, calorimetric, and microscopic techniques.
• Assessment of vesicle size, stability, encapsulation efficiency, and pH-triggered release.

Main Results:

• Successful synthesis of two novel pH-responsive amphiphiles.
• Spontaneous formation of stable, nanosized vesicles in water.
• Vesicle size increases with decreasing pH and increasing amphiphile concentration.
• Efficient encapsulation of both hydrophilic and hydrophobic molecules.
• pH-triggered release of encapsulated dyes in acidic conditions.

Conclusions:

• The synthesized amphiphiles form stable, pH-responsive vesicles suitable for drug delivery.
• These vesicles demonstrate potential as biocompatible DDSs for cancer chemotherapy.
• The pH-triggered release mechanism offers a promising approach for targeted drug administration.