Malleable Hydrogel Embedded with Micellar Cargo-Expellers as a Prompt Transdermal Patch

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Drug Delivery Systems

Background:

• Hydrogels are promising for transdermal drug delivery but suffer from poor skin adhesion and slow drug release.
• Existing hydrogel patches lack malleability, hindering effective contact with curved skin surfaces like the nose or fingers.
• The internal structure of hydrogels inherently retards the release of embedded therapeutic agents.

Purpose of the Study:

• To develop a malleable hydrogel with rapid cargo release capabilities for improved transdermal drug delivery.
• To address the spatiotemporal limitations of conventional hydrogel patches.
• To create a novel hydrogel system suitable for pharmaceutical and cosmetic applications on diverse skin areas.

Main Methods:

• Preparation of a poly(vinyl alcohol)-borax hydrogel embedding freely mobile poly(hydroxyethyl methacrylate) (PHEMA) micelles via in situ polymerization.
• Incorporation of micelles as cargo expellers within the hydrogel matrix.
• Evaluation of cargo release kinetics using Nile Red as a model drug and assessment of skin irritation and in vivo toxicity.

Main Results:

• The developed hydrogel is malleable and exhibits rapid cargo release, delivering 25-fold more Nile Red in 3 minutes compared to control hydrogels.
• The embedded micelle particles act as expellers, releasing cargo via a concentration gradient in wet conditions.
• The hydrogel possesses self-healing properties due to dynamic borate-diol bonds, ensuring tight contact with curved skin and absorbing mechanical shocks.

Conclusions:

• The novel, malleable hydrogel effectively overcomes the spatiotemporal challenges of traditional hydrogel patches.
• The rapid and controlled drug release mechanism holds significant potential for advanced transdermal systems.
• This hydrogel demonstrates safety and efficacy, paving the way for innovative pharmaceutical and cosmetic skin patch technologies.