Alginate/chitosan nanoparticles are effective for oral insulin delivery

Area of Science:

• Biomaterials Science
• Pharmacology
• Nanotechnology

Background:

• Oral insulin delivery remains a significant challenge due to enzymatic degradation and poor absorption in the gastrointestinal tract.
• Developing effective oral insulin formulations is crucial for improving diabetes management and patient compliance.

Purpose of the Study:

• To evaluate the pharmacological activity of insulin-loaded alginate/chitosan nanoparticles after oral administration in diabetic rats.
• To assess the impact of nanoparticle encapsulation on insulin's oral bioavailability and bioactivity.

Main Methods:

• Insulin-loaded alginate/chitosan nanoparticles were prepared using ionotropic pre-gelation and polyelectrolyte complexation.
• In vivo studies involved oral administration to streptozotocin-induced diabetic rats, monitoring blood glucose reduction.
• Confocal microscopy was used to track fluorescein (FITC)-labeled insulin within the intestinal mucosa.

Main Results:

• The nanoparticles exhibited mucoadhesive properties and a size suitable for gastrointestinal uptake, with over 70% insulin association efficiency.
• Oral administration of nanoparticles at 50 and 100 IU/kg doses reduced blood glucose by over 40% for more than 18 hours.
• Pharmacological availability was significantly enhanced (6.8% and 3.4%) compared to oral insulin solution (1.6%), with evidence of intestinal adhesion and insulin internalization.

Conclusions:

• Encapsulation of insulin into mucoadhesive alginate/chitosan nanoparticles is a key strategy for improving oral absorption.
• These nanoparticles demonstrate significant potential for enhancing oral bioactivity of insulin, paving the way for non-invasive diabetes treatment.