Design of Pectin-Based Hydrogel Microspheres for Targeted Pulmonary Delivery

Area of Science:

• Biomaterials Science
• Drug Delivery Systems
• Respiratory Medicine

Background:

• Pulmonary drug delivery offers a noninvasive therapeutic route but faces challenges from respiratory tract defense mechanisms.
• Effective delivery to the deep lungs requires overcoming drug removal or deactivation by the body's natural defenses.

Purpose of the Study:

• To develop a natural polymer-based microsphere system for encapsulating pulmonary drugs.
• To facilitate targeted drug delivery to the deep lungs using microspheres around 3 μm in diameter.
• To optimize the production of pectin-based hydrogel microspheres for size and uniformity.

Main Methods:

• Pectin was selected as a biocompatible and biodegradable base material.
• Electrospray technique was employed to fabricate pectin-based hydrogel microspheres.
• Design-Expert software was utilized for process optimization, determining optimal pectin/PEO ratio, voltage, distance, and flow rate.

Main Results:

• Optimized conditions yielded pectin-based hydrogel microspheres with controlled size and uniformity.
• Gelatin coating (0.75% in 0.3 M mannitol) enhanced microsphere stability.
• Coated microspheres maintained high responsiveness in simulated lung fluid, indicating suitability for the deep lung environment.

Conclusions:

• A gelatin-coated pectin-based microsphere system was successfully developed.
• This system demonstrates potential for targeted drug delivery to the deep lungs.
• The microspheres offer a promising approach for rapid drug release in pulmonary applications.