Related Experiment Video
Updated: Jan 3, 2026
13:15
Fabrication of Electrochemical-DNA Biosensors for the Reagentless Detection of Nucleic Acids, Proteins and Small Molecules
Published on: June 1, 2011
34.4K
Ultrasensitive Electrochemical DNA Biosensor Based on a Label-Free Assembling Strategy Using a Triblock polyA DNA
Lele Wang1, Yanli Wen1, Xue Yang1
1Laboratory of Biometrology, Division of Chemistry , Shanghai Institute of Measurement and Testing Technology , 1500 Zhang Heng Road , Shanghai 201203 , People's Republic of China.
Analytical Chemistry
|November 21, 2019
Summary
This study introduces a novel triblock DNA probe (PAP) for label-free biosensors, improving reproducibility and stability. The biosensor achieves high sensitivity and specificity, distinguishing even single nucleotide polymorphisms.
Area of Science:
- Biosensor Technology
- Molecular Diagnostics
- Nanomaterials in Biology
Background:
- Multiblock DNA probes are crucial for multitarget biosensors, enhancing specificity and sensitivity.
- Existing methods rely on chemical synthesis, limiting practicality and biological compatibility.
Purpose of the Study:
- To develop a label-free DNA biosensor using a novel triblock DNA probe (probe-PolyA-probe, PAP).
- To improve biosensor reproducibility, stability, and specificity without chemical linkers or nanomaterials.
Main Methods:
- A triblock DNA probe (PAP) was designed, featuring two capture probes flanking a polyA segment.
- The polyA segment facilitated self-assembly onto a gold electrode surface.
- Hybridization of target DNA with the co-assembled capture probes was analyzed label-free.
Main Results:
- The PAP-based biosensor demonstrated excellent reproducibility, stability, and regeneration.
- Achieved a high sensitivity of 10 fM with a wide analysis range (10 fM to 1 nM).
- Showcased superior specificity, distinguishing mismatched sequences and single nucleotide polymorphisms.
Conclusions:
- The label-free PAP strategy offers a practical and biologically compatible approach for DNA biosensor development.
- This method significantly enhances biosensor performance, including sensitivity, specificity, and stability.
- Demonstrated potential for analyzing genomic DNA without PCR amplification.
