Glucose-Sensitive Polyphosphoester Diblock Copolymer for an Insulin Delivery System

Area of Science:

• Polymer Chemistry
• Biomaterials Science
• Nanotechnology

Background:

• Developing smart drug delivery systems is crucial for targeted therapeutic release.
• Glucose-responsive materials offer potential for automated insulin delivery in diabetes management.
• Polyphosphoester-based copolymers are explored for their biocompatibility and tunable properties.

Purpose of the Study:

• To synthesize and characterize a novel glucose-sensitive diblock copolymer.
• To investigate the self-assembly behavior and glucose responsiveness of the copolymer nanoparticles.
• To evaluate the potential of the copolymer as a carrier for glucose-triggered insulin release.

Main Methods:

• Synthesis of a polyphosphoester diblock copolymer ((PBYP-g-MPBA)-b-PEEP) using ring-opening copolymerization, click chemistry, and amide reactions.
• Characterization of self-assembled core-shell nanoparticles (NPs) using dynamic light scattering and transmission electron microscopy.
• In vitro evaluation of glucose-triggered FITC-insulin release and assessment of copolymer biocompatibility via MTT assays and hemolysis tests.

Main Results:

• The synthesized amphiphilic diblock copolymer self-assembles into core-shell nanoparticles in aqueous solutions.
• Nanoparticle swelling and FITC-insulin release rates were directly correlated with increasing glucose concentrations due to boronate ester formation.
• Methyl thiazolyl tetrazolium assays and hemolysis tests confirmed the good biocompatibility of the (PBYP-g-MPBA)-b-PEEP copolymers.

Conclusions:

• The glucose-sensitive polyphosphoester diblock copolymer exhibits excellent potential for developing advanced insulin delivery systems.
• The self-assembled nanoparticles demonstrate controllable drug release triggered by glucose concentration.
• The demonstrated biocompatibility supports the further development of this copolymer for biomedical applications.