Laser plasma jet driven microparticles for DNA/drug delivery.

Area of Science:

• Biomedical Engineering
• Materials Science
• Genetics

Background:

• Traditional gene delivery methods face challenges with efficiency and cell penetration.
• Developing non-viral vectors for efficient genetic material transfer is crucial for therapeutic applications.

Purpose of the Study:

• To describe a new microparticle delivery device utilizing laser-induced plasma jets.
• To demonstrate the device's capability for transferring DNA-coated microparticles into living cells for transfection.

Main Methods:

• Laser ablation (Nd:YAG, 1064 nm) of an aluminum foil coated with DNA-loaded gold microparticles.
• High-speed videography (500 kfps) to visualize plasma jet dynamics and particle transport.
• Delivery of 1 µm gold microparticles into onion cells to assess transfection efficiency.

Main Results:

• The plasma jet effectively carried DNA-coated microparticles into onion cells, achieving successful transfection.
• High-speed imaging revealed particle speeds reaching up to 1320 m/s.
• The device demonstrated a cost-effective approach using an aluminum launch pad, with potential for biocompatible materials in clinical settings.

Conclusions:

• The described microparticle delivery device is effective for gene transfer into living cells.
• The plasma jet generated by laser ablation serves as an efficient carrier for microparticles.
• The technology holds promise for developing miniature, hand-held drug and DNA delivery systems for biological applications.