[Preparation and performance evaluation of controlled-release chitosan-based microneedles]

Area of Science:

• Biomaterials Science
• Drug Delivery Systems
• Nanotechnology

Background:

• Continuous drug delivery systems are crucial for vaccines and hormone therapies.
• Microneedle patches offer a promising avenue for transdermal drug administration.
• Chitosan-based materials are explored for their biocompatibility and controlled-release properties.

Purpose of the Study:

• To optimize the preparation process of polyvinyl alcohol/chitosan-based microneedle arrays (PVA/CS-MN).
• To characterize the physical, mechanical, and in vitro properties of the optimized PVA/CS-MN.
• To evaluate the drug release kinetics of ascorbic acid from the developed microneedle system.

Main Methods:

• Optimization of PVA/CS-MN fabrication process.
• Characterization of microneedle morphology, mechanical strength, and dissolution/swelling behavior.
• In vitro skin penetration and transdermal diffusion studies using ascorbic acid as a model drug.

Main Results:

• Optimized PVA/CS-MN exhibited favorable morphology and mechanical integrity.
• The microneedles effectively created microchannels in the skin and demonstrated controllable dissolution and swelling.
• In vitro studies showed sustained release of ascorbic acid, with 57% released in 1 hour and 92% over 7 days.

Conclusions:

• The optimized PVA/CS-MN system possesses controllable sustained-release capabilities.
• These microneedles demonstrate excellent drug delivery efficiency for transdermal applications.
• PVA/CS-MN presents a novel and effective option for sustained transdermal drug delivery.