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Surface stress-induced membrane biosensor based on double-layer stable gold nanostructures for E. coli detection
Dong Zhao1, Yan Liu1, Zhen Pei1
1MicroNano System Research Center, Key Lab of Advanced Transducers and Intelligent Control System of the Ministry of Education & College of Information and Computer, Taiyuan University of Technology, Taiyuan, People's Republic of China.
IET Nanobiotechnology
|December 8, 2019
Summary
A novel biosensor using double-layer gold nanostructures offers stable and sensitive detection of Escherichia coli (E. coli) O157:H7. This advancement is crucial for ensuring public health and safety in food and water supplies.
Area of Science:
- Nanotechnology
- Biosensors
- Food Safety
Background:
- Surface stress-based biosensors are vital for rapid detection of Escherichia coli (E. coli).
- Developing stable sensitive elements for flexible biosensors remains a significant challenge.
- Accurate detection of E. coli O157:H7 is critical for public health and food safety.
Purpose of the Study:
- To develop a stable and sensitive biosensor for detecting E. coli O157:H7.
- To investigate the performance of double-layer gold nanostructures (D-AuNS) in surface stress-induced biosensors.
- To establish a new method for preparing stable sensitive elements for E. coli detection.
Main Methods:
- Fabrication of a surface stress-induced biosensor utilizing double-layer stable gold nanostructures (D-AuNS-SSMB).
- Detection of E. coli O157:H7 using the D-AuNS-SSMB.
- Analysis of biosensor response (resistance change) correlated with E. coli O157:H7 concentrations.
- Evaluation of biosensor stability, reproducibility, and specificity.
Main Results:
- The D-AuNS-SSMB demonstrated high stability in bacterial detection.
- A linear relationship was observed between biosensor resistance change and the logarithm of E. coli O157:H7 concentrations (10^3 to 10^7 CFU/mL).
- The limit of detection (LOD) for E. coli O157:H7 was determined to be 43 CFU/mL.
- The biosensor showed excellent stability, reproducibility, and specificity.
Conclusions:
- The developed D-AuNS-SSMB provides a stable and sensitive platform for E. coli O157:H7 detection.
- Surface stress generated by antigen-antibody binding is the primary signal transduction mechanism.
- This study presents a novel preparation method for stable sensitive elements applicable to E. coli detection, enhancing food and water safety measures.
