Related Experiment Video
Updated: May 9, 2026
09:32
ampliPHOX Colorimetric Detection on a DNA Microarray for Influenza
Published on: June 9, 2011
Quantitative analysis of H5N1 DNA hybridization on nanowell array electrode
Min Seok Cha1, Ju Kyung Lee, Si Hyeong Cho
1Department of Biomedical Engineering, Yonsei University, Won-Ju 220-710, South Korea.
Journal of Nanoscience and Nanotechnology
|July 26, 2013
Summary
A novel nanowell array electrode system enables sensitive H5N1 DNA detection without amplification. This electrochemical method quantifies H5N1 DNA from 1 pM to 1 microM, offering a new diagnostic tool.
Area of Science:
- Nanotechnology
- Biosensors
- Molecular Diagnostics
Background:
- H5N1 avian influenza poses a significant global health threat.
- Accurate and rapid detection of H5N1 DNA is crucial for disease control.
- Existing detection methods may require amplification or lack sensitivity.
Purpose of the Study:
- To develop an electrochemical quantitative system for H5N1 DNA detection.
- To utilize a nanowell array electrode for sensitive and label-free detection.
- To establish a method for quantifying H5N1 DNA within a specific concentration range.
Main Methods:
- Immobilization of an 18-mer DNA probe onto a 500 nm diameter nanowell array electrode.
- Surface modification using streptavidin and a self-assembly monolayer (SAM).
- Characterization of DNA hybridization using Atomic Force Microscopy (AFM) and Electrochemical Impedance Spectroscopy (EIS).
Main Results:
- AFM confirmed DNA hybridization by observing a reduction in nanowell depth from 200 nm to 15 nm.
- EIS analysis revealed changes in charge transfer resistance (deltaR(ct)) upon target DNA binding.
- The system demonstrated quantitative detection of H5N1 DNA across a concentration range of 1 pM to 1 microM.
Conclusions:
- A nanowell array electrode-based electrochemical system provides a sensitive and label-free method for H5N1 DNA detection.
- The developed system allows for the quantification of H5N1 DNA without the need for amplification.
- This technology holds promise for rapid and accurate diagnostics of H5N1 influenza.
