Highly magneto-responsive multilayer microcapsules for controlled release of insulin

Area of Science:

• Biomaterials Science
• Nanotechnology
• Drug Delivery Systems

Background:

• Development of advanced drug delivery systems is crucial for targeted and controlled therapeutic interventions.
• Polyelectrolyte multilayer microcapsules offer versatile platforms for encapsulating therapeutic agents.
• Magnetically responsive materials enable external control over drug release kinetics.

Purpose of the Study:

• To synthesize magneto-responsive polyelectrolyte multilayer microcapsules using iron oxide nanoparticles (Fe₃O₄ NPs) and polyallylamine hydrochloride (PAH).
• To encapsulate insulin within these microcapsules, leveraging pH-sensitive membrane permeability.
• To investigate the in vitro release behavior of insulin under an external alternating magnetic field.

Main Methods:

• Layer-by-layer (LbL) self-assembly technique for microcapsule fabrication.
• Characterization using Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), and zeta-potential analysis.
• Insulin encapsulation and in vitro release studies under varying magnetic field conditions.

Main Results:

• Successfully prepared magneto-responsive polyelectrolyte multilayer microcapsules with high insulin encapsulation efficiency (92.08±5.57%).
• Demonstrated significantly accelerated insulin release upon application of an external alternating magnetic field.
• Observed pulse release upon cyclic on-off magnetic field operations, indicating an excellent
• switching on
• ] ,
• effect attributed to nanoparticle rearrangement and polyelectrolyte chain dynamics.

Conclusions:

• Magneto-responsive polyelectrolyte multilayer microcapsules are effective carriers for insulin delivery.
• External magnetic fields provide a precise mechanism for controlling and accelerating drug release.
• The observed
• switching on
• release behavior holds promise for advanced pulsed drug delivery systems.