Machine-Free Polymerase Chain Reaction with Triangular Gold and Silver Nanoparticles

Area of Science:

• Biotechnology
• Nanotechnology
• Molecular Biology

Background:

• Metal nanoparticles (NPs) exhibit photothermal effects valuable in biotechnology.
• The influence of NP shape on photothermal properties and polymerase chain reaction (PCR) efficiency remains underexplored.

Purpose of the Study:

• To synthesize triangular gold and silver NPs.
• To evaluate their photothermal properties for variable-temperature PCR.
• To assess their efficiency in machine-free and commercial PCR.

Main Methods:

• Synthesis of triangular gold and silver nanoparticles.
• Photothermal property evaluation using varying laser power, concentration, and irradiation time.
• Variable-temperature PCR assays with and without nanoparticles.
• Circular dichroism and UV spectroscopy for DNA interaction analysis.

Main Results:

• Synthesized triangular NPs reached ~90 °C under 808 nm laser irradiation.
• Achieved machine-free PCR with efficiency comparable to commercial machines.
• Observed increased PCR efficiency when NPs were added to commercial PCR reactions.
• Spectroscopic data suggested direct DNA binding and unfolding by NPs.

Conclusions:

• Triangular gold and silver NPs enable cost-effective, machine-free PCR.
• NPs enhance DNA amplification through direct interaction and photothermal heating.
• These NPs hold potential for developing robust PCR modules and other photothermal applications.