Core crosslinking of biodegradable block copolymer micelles based on poly(ester carbonate)

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Nanotechnology

Background:

• Biodegradable amphiphilic block copolymers offer potential for nanocarrier development.
• Micelles formed from these polymers require enhanced stability for biomedical applications.
• Crosslinking strategies can improve the structural integrity of nanomicelles.

Purpose of the Study:

• To synthesize and characterize crosslinked micelles from a biodegradable amphiphilic block copolymer.
• To evaluate the stability and cellular uptake of the prepared crosslinked micelles.
• To explore the potential of these stabilized micelles in biomedical applications.

Main Methods:

• Synthesis of PEG-b-P(LA-co-MAC) copolymer.
• Preparation of spherical micelles and subsequent crosslinking via radical polymerization.
• Characterization of micelle size, size distribution, and critical micelle concentration (CMC).
• In vitro cellular internalization studies using Hela cells (inverted fluorescence microscopy, CLSM).

Main Results:

• Spherical micelles with a hydrophobic P(LA-co-MAC) core and PEG shell were successfully prepared.
• Crosslinking significantly improved micelle stability, confirmed by CMC and thermodynamic studies.
• Crosslinked micelles maintained similar sizes and narrow size distribution compared to uncrosslinked micelles.
• Efficient internalization of stabilized micelles into Hela cells was demonstrated.

Conclusions:

• Crosslinked micelles derived from PEG-b-P(LA-co-MAC) exhibit enhanced stability and biocompatibility.
• These micelles are effectively internalized by cells, indicating potential for targeted delivery.
• The stabilized nanoscale micelles are promising candidates for drug delivery and disease diagnosis.