N-(2-Hydroxypropyl)methacrylamide-Based Linear, Diblock, and Starlike Polymer Drug Carriers: Advanced Process for...

Area of Science:

• Polymer Chemistry
• Drug Delivery Systems
• Bioconjugation

Background:

• Development of advanced polymer drug carriers is crucial for effective cancer therapy.
• Existing synthesis methods for N-(2-hydroxypropyl)methacrylamide (HPMA)-based carriers can be complex and solvent-intensive.
• Need for well-defined polymer architectures enabling targeted and triggered drug release.

Purpose of the Study:

• To develop a simplified and efficient synthesis of HPMA-based polymer drug carriers.
• To create linear, diblock, and starlike copolymers for pH-triggered drug activation in tumor tissues.
• To establish a selective deprotection method for hydrophilic HPMA copolymers.

Main Methods:

• Controlled reversible addition-fragmentation chain transfer (RAFT) polymerization for synthesizing HPMA copolymers.
• Development of a selective deprotection procedure for tert-butoxycarbonyl hydrazide and amine groups.
• One-pot removal of polymer end groups and characterization of deprotection kinetics and efficacy.

Main Results:

• Successful synthesis of well-defined, monodispersed linear, diblock, and starlike HPMA copolymers.
• Significant reduction in synthetic steps and organic solvent consumption.
• Formation of copolymers suitable for pH-triggered drug release, with efficient deprotection achieved.

Conclusions:

• The simplified RAFT polymerization approach facilitates the preparation of advanced HPMA-based polymer drug carriers.
• The developed method enables the synthesis of copolymers for targeted drug delivery and activation via pH-sensitive hydrazone bonds.
• This approach supports the application of polymer conjugates in enhanced tumor treatment strategies.