Effective Dispensing Methods for Loading Drugs Only to the Tip of DNA Microneedles

Area of Science:

• Biomaterials Science
• Drug Delivery Systems
• Nanotechnology

Background:

• Microneedle technology offers a promising platform for transdermal drug delivery.
• Efficiently loading therapeutic agents, especially to the tip of microneedles, remains a challenge.
• Controlling drug diffusion during fabrication is crucial for precise dosing.

Purpose of the Study:

• To develop a novel and simple method for efficient drug loading into DNA microneedles.
• To precisely load fluorescein isothiocyanate (FITC)-dextran to the tip of microneedles.
• To evaluate the impact of manufacturing processes on drug diffusion and loading efficiency.

Main Methods:

• Fabrication of DNA microneedles using a dispensing and suction method with FITC-dextran as a model drug.
• Evaluation of the vacuum process's influence on FITC diffusion during microneedle manufacturing.
• Development of a micro-jetting system with a micro-nozzle for accurate and rapid drug loading.
• Utilizing anti-diffusion and micro-jetting techniques for controlled drug deposition.

Main Results:

• Experimental results demonstrated efficient capture and loading of FITC-dextran to the microneedle tip.
• Simulations corroborated experimental findings, showing apparent drug diffusion characteristics.
• The micro-jetting system achieved accurate and rapid loading of small amounts of FITC.
• The developed method proved more efficient in loading FITC to microneedle tips compared to existing techniques.

Conclusions:

• The proposed method offers a simple, fast, and efficient approach for fabricating drug-loaded DNA microneedles.
• The technique allows for precise control over drug loading at the microneedle tip, minimizing diffusion issues.
• This advancement is crucial for the clinical translation of microneedle-based drug delivery platforms.