Glucose-Triggered Insulin Release from Fe³⁺ -Cross-linked Alginate Hydrogel: Experimental Study and Theoretical...

Area of Science:

• Biomaterials Science
• Drug Delivery Systems
• Hydrogel Engineering

Background:

• Insulin delivery remains a challenge for diabetes management.
• Alginate hydrogels offer biocompatibility and tunable properties for drug encapsulation.
• Controlled release mechanisms are crucial for effective therapeutic outcomes.

Purpose of the Study:

• To investigate the mechanisms of glucose-triggered insulin release from iron(III)-cross-linked alginate hydrogel particles.
• To explore the role of Fenton-type reactions and free radicals in hydrogel degradation and drug release.
• To develop a theoretical model for predicting and optimizing drug release kinetics.

Main Methods:

• Synthesis of platelet-shaped alginate hydrogel particles encapsulating glucose oxidase-conjugated silica nanoparticles.
• Induction of insulin release using glucose and monitoring of particle structural changes.
• Application of a theoretical model to experimental data for analysis of release mechanisms.

Main Results:

• Glucose triggers insulin release by increasing hydrogel porosity through enzymatic reactions and Fenton-type chemistry.
• Iron(III) cations catalyze the conversion of hydrogen peroxide to free radicals, decreasing hydrogel density.
• The hydrogel particles maintain structural integrity while allowing for controlled insulin release.

Conclusions:

• The developed alginate hydrogel system provides a glucose-responsive platform for insulin delivery.
• The study elucidates the underlying chemical mechanisms governing controlled drug release.
• This research offers a promising model for the design of advanced drug-release systems.