Chitosan electrodeposition for microrobotic drug delivery

Area of Science:

• Biomaterials Engineering
• Drug Delivery Systems
• Nanotechnology

Background:

• Steerable magnetic microdevices offer potential for targeted therapies.
• Chitosan hydrogels are biocompatible and can be functionalized for drug delivery.
• Current methods for functionalizing microdevices require improvement for controlled release.

Purpose of the Study:

• To present a novel co-electrodeposition method for functionalizing magnetic microdevices with drug-loaded chitosan hydrogels.
• To characterize the properties of the chitosan hydrogel matrix, including drug loading, release kinetics, and environmental responsiveness.
• To demonstrate the feasibility of using these functionalized microdevices for therapeutic applications, specifically in posterior eye diseases.

Main Methods:

• Co-electrodeposition of drug-loaded chitosan hydrogels onto steerable magnetic microdevices.
• Characterization of hydrogel morphology and drug loading capacity.
• In vitro drug release studies under varying pH conditions.
• Fabrication and testing of a prototype microrobot functionalized with the hydrogel system.

Main Results:

• Successful co-electrodeposition of drug-loaded chitosan hydrogels was achieved.
• The hydrogel matrix demonstrated sustained release of a model drug (Brilliant Green) at 40-80 μg cm(-2).
• The system exhibited pH-responsive drug release, with enhanced release under slightly acidic conditions.
• A functional prototype microrobot was developed for potential use in posterior eye disease treatment.

Conclusions:

• The developed method enables effective functionalization of magnetic microdevices with drug-loaded chitosan hydrogels.
• The chitosan hydrogel system provides tunable and sustained drug delivery with pH-responsive characteristics.
• This technology holds promise for advanced therapeutic strategies, particularly for localized treatment of posterior eye conditions.