Related Experiment Video
Updated: Jul 7, 2026
17:16
Development of an Electrochemical DNA Biosensor to Detect a Foodborne Pathogen
Published on: June 3, 2018
Using oligonucleotide-functionalized Au nanoparticles to rapidly detect foodborne pathogens on a piezoelectric
Sz-Hau Chen1, Vivian C H Wu, Yao-Chen Chuang
1Department of Biological Science and Technology, National Chiao Tung University, Hsinchu 30005, Taiwan.
Journal of Microbiological Methods
|February 19, 2008
Summary
This study presents a novel piezoelectric biosensor for rapid, real-time detection of the foodborne pathogen Escherichia coli O157:H7. The biosensor, utilizing gold nanoparticle amplification, successfully identified the pathogen in real food samples.
Area of Science:
- Biosensor technology
- Food safety analysis
- Molecular diagnostics
Background:
- Foodborne illnesses caused by pathogens like Escherichia coli O157:H7 pose significant public health risks.
- Accurate and rapid detection methods are crucial for preventing outbreaks and ensuring food safety.
- Existing detection methods can be time-consuming or require complex laboratory equipment.
Purpose of the Study:
- To develop and validate a highly sensitive piezoelectric biosensor for the real-time detection of Escherichia coli O157:H7.
- To utilize gold nanoparticle amplification for enhanced sensitivity and specificity.
- To demonstrate the biosensor's capability in detecting the pathogen in real food matrices.
Main Methods:
- A circulating-flow piezoelectric biosensor was designed and fabricated.
- A specific thiolated DNA probe (Probe 1) targeting the E. coli O157:H7 eaeA gene was immobilized on the sensor surface.
- Gold nanoparticles conjugated with a second thiolated probe (Probe 2) were used for signal amplification and sequence verification.
- Polymerase Chain Reaction (PCR) was employed to amplify the target gene fragment from bacterial samples.
- Hybridization events on the biosensor surface were detected via mass-induced frequency shifts.
Main Results:
- The piezoelectric biosensor demonstrated real-time detection capabilities for Escherichia coli O157:H7.
- The limit of detection was found to be as low as 1.2 x 10^2 CFU/ml.
- A linear correlation was observed for pathogen concentrations ranging from 10^2 to 10^6 CFU/ml.
- The biosensor successfully detected the target pathogen in actual food samples, indicating practical applicability.
Conclusions:
- The developed piezoelectric biosensor offers a sensitive and rapid method for detecting Escherichia coli O157:H7.
- The gold nanoparticle amplification strategy significantly enhances detection performance.
- This technology holds promise for effective food safety monitoring and pathogen surveillance.
