Related Experiment Video
Updated: Mar 31, 2026
A Microfluidic-based Electrochemical Biochip for Label-free DNA Hybridization Analysis
Published on: September 10, 2014
In-Line Tapered Microfiber Sensors for Label-Free Simultaneous Detection of Dual Genes via Enzymatic Recombinase
Minglu Yan1, Xue Zhou1, Ya-Nan Zhang1
1State Key Laboratory of Synthetical Automation for Process Industries, College of Information Science and Engineering, Northeastern University, Shenyang 110819, Liaoning, China.
This study introduces a novel label-free diagnostic platform for simultaneous detection of multiple nucleic acid targets using enzymatic recombinase amplification (ERA) and optical fiber sensing. This method offers a cost-effective and efficient approach for disease diagnostics, especially in resource-limited settings.
Area of Science:
- Biomedical Engineering
- Molecular Diagnostics
- Optical Sensing
Background:
- Enzymatic recombinase amplification (ERA) is a sensitive nucleic acid detection method.
- Current multiplexed ERA assays require costly fluorescent labels and complex optical setups.
- There is a need for simpler, more cost-effective multiplexed diagnostic tools.
Purpose of the Study:
- To develop a label-free dual-gene detection platform integrating ERA with optical fiber sensing.
- To enable simultaneous, real-time monitoring of nucleic acid amplification without fluorescent labels.
- To demonstrate the platform's potential for practical disease diagnostics.
Main Methods:
- Integration of ERA with a refractive-index-based sensing platform using an in-line tapered microfiber transducer.
- Covalent immobilization of gene-specific primer pairs on spatially separated microfiber segments via click chemistry.
- Real-time signal processing using Fast Fourier Transform and frequency-selective filtering.
Main Results:
- Simultaneous detection and discrimination of Hepatitis B and C virus genes within 20 minutes.
- Achieved a detection limit of 13 copies/μL per target with a dynamic range of 10-105 copies/μL.
- Demonstrated comparable accuracy to standard fluorescent ERA assays using clinical serum samples.
Conclusions:
- The developed label-free platform offers a sensitive, efficient, and cost-effective solution for multiplexed nucleic acid detection.
- The system's potential for deployment in resource-limited settings is highlighted by its simplicity and remote sensing capability.
- This technology shows promise for practical applications in disease diagnostics and outbreak surveillance.
