Related Experiment Video
Updated: May 5, 2026
09:03
Field-Deployable Candidatus Liberibacter asiaticus Detection Using Recombinase Polymerase Amplification Combined with CRISPR-Cas12a
Published on: December 23, 2022
3.1K
Programmable Dual-Phase Electrochemical Biosensor Combines Homogeneous CRISPR/Cas12a Activation with Interfacial
Jia Zhao1,2, Zhuqi Sui1, Yi Wang3
1Jiaxing Key Laboratory of Molecular Recognition and Sensing, College of Biological and Chemical Engineering, Jiaxing University, Jiaxing 314001, China.
Analytical Chemistry
|September 9, 2025
Summary
This study introduces a novel dual-phase electrochemical biosensor for sensitive nucleic acid detection. The system enhances amplification efficiency and reproducibility for accurate diagnostics, even in complex samples like blood.
Area of Science:
- Biomedical Engineering
- Molecular Diagnostics
- Electrochemistry
Background:
- Existing electrochemical biosensors for nucleic acid diagnostics face limitations due to multilayer surface assembly and interface-confined amplification.
- These methods exhibit inefficient enzyme activity, poor mass transport, and inconsistent probe orientation, impacting amplification efficiency and reproducibility.
Purpose of the Study:
- To develop a programmable dual-phase electrochemical biosensing system that decouples amplification from signal transduction for improved nucleic acid diagnostics.
- To overcome the limitations of interface-bound amplification strategies in electrochemical biosensors.
Main Methods:
- A homogeneous phase amplification using target-triggered polymerization and CRISPR/Cas12a activation.
- Signal transduction via terminal deoxynucleotidyl transferase (TdT)-mediated polyguanine extension and methylene blue voltammetry.
- Utilized a dual-phase design integrating homogeneous amplification with localized electrochemical signal generation.
Main Results:
- Achieved a low detection limit of 25 attomolar for miRNA-21.
- Demonstrated excellent sequence specificity and reliable performance in human blood samples.
- The dual-phase design circumvents drawbacks of interface-bound cascades while retaining sensitivity.
Conclusions:
- The developed system offers a robust and generalizable platform for highly sensitive nucleic acid diagnostics.
- The biosensor exhibits high modularity and operational simplicity.
- This approach significantly improves amplification efficiency and reproducibility for practical applications.
