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Development of an Electrochemical DNA Biosensor to Detect a Foodborne Pathogen

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Published on: June 3, 2018

DNA detection using a radio frequency biosensor with gold nanoparticles.

Jui-Hung Chien¹, Ching-Hao Yang, Ping-Hei Chen

¹Department of Mechanical Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei, Taiwan, 106.

Frontiers in Bioscience : a Journal and Virtual Library

|May 30, 2008

Summary

This study introduces a novel multi-layer gold nanoparticle (AuNP) biosensor for sensitive DNA detection. The innovative radio-frequency biosensor achieves a 10 pM detection limit and distinguishes single DNA base-pair mutations.

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Last Updated: Jul 4, 2026

Development of an Electrochemical DNA Biosensor to Detect a Foodborne Pathogen

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Published on: June 3, 2018

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Fabrication of Electrochemical-DNA Biosensors for the Reagentless Detection of Nucleic Acids, Proteins and Small Molecules

Fabrication of Electrochemical-DNA Biosensors for the Reagentless Detection of Nucleic Acids, Proteins and Small Molecules

Published on: June 1, 2011

Area of Science:

Nanotechnology and Biosensing
Molecular Diagnostics

Background:

Sensitive detection of DNA is crucial for early disease diagnosis and genetic analysis.
Existing biosensing methods often face limitations in sensitivity and specificity.
Gold nanoparticles (AuNPs) offer unique optical and electronic properties for biosensing applications.

Purpose of the Study:

To develop a novel radio-frequency (RF) biosensor utilizing multi-layer gold nanoparticles (AuNPs) for enhanced DNA detection sensitivity.
To establish a critical signal amplification methodology for improved biosensing performance.
To assess the biosensor's capability in distinguishing single base-pair DNA mutations.

Main Methods:

Fabrication of a novel radio-frequency biosensor incorporating multi-layer AuNPs.
Utilizing DNA hybridization as the detection mechanism.
Employing a temperature controlling system for precise melting temperature analysis.

Main Results:

The multi-layer AuNP configuration demonstrated a significant bandwidth change upon DNA hybridization, exceeding that of a double-layer AuNP by up to 0.5 GHz.
The developed biosensor achieved a detection limit of 10 picomolar (pM) for the target DNA.
The biosensor successfully distinguished single base-pair mutations from perfect match DNA at 47°C.

Conclusions:

The proposed multi-layer AuNP-based RF biosensor and signal amplification methodology are effective for sensitive DNA detection.
The biosensor exhibits high specificity, capable of differentiating single nucleotide polymorphisms.
This technology holds potential for developing advanced screening kits for biomolecule quantification in real-world samples for healthcare applications.