DNA bioassay-on-chip using SERS detection for dengue diagnosis

Area of Science:

• Biotechnology
• Nanotechnology
• Analytical Chemistry

Background:

• Developing rapid and cost-effective diagnostic tools is crucial for infectious disease control.
• Existing DNA detection methods often involve complex procedures and multiple steps, increasing time and cost.
• Surface-enhanced Raman scattering (SERS) offers high sensitivity for molecular detection.

Purpose of the Study:

• To develop a novel, simplified DNA bioassay-on-chip for detecting specific oligonucleotide sequences.
• To leverage SERS technology on a bimetallic nanowave chip for enhanced signal detection.
• To demonstrate a wash-free detection method to reduce assay complexity and cost.

Main Methods:

• Fabrication of a bimetallic nanowave chip.
• Immobilization of capture probes for target DNA sequences.
• Performing a single-step reaction on the chip surface.
• Measuring SERS signals for target detection without a washing step.

Main Results:

• Successful detection of specific oligonucleotide sequences of dengue virus 4.
• Demonstration of a simple-to-use bioassay with a single reaction step.
• Significant reduction in reagent cost due to the elimination of washing steps.
• High sensitivity achieved through SERS on the bimetallic nanowave platform.

Conclusions:

• The novel DNA bioassay-on-chip is a promising platform for rapid and cost-effective pathogen detection.
• The wash-free SERS approach simplifies the assay procedure and reduces overall costs.
• This technology has potential applications in point-of-care diagnostics for infectious diseases like dengue fever.