Related Experiment Video
Updated: Jun 28, 2026
13:15
Fabrication of Electrochemical-DNA Biosensors for the Reagentless Detection of Nucleic Acids, Proteins and Small Molecules
Published on: June 1, 2011
Electrochemical sensor for detection of unmodified nucleic acids
N D Popovich1, A E Eckhardt, J C Mikulecky
1Xanthon, Inc., 104 T.W. Alexander Drive, P.O. Box 12296, Research Triangle Park, NC 27709, USA.
Talanta
|October 31, 2008
Summary
This study introduces a novel nucleic acid sensor using electrochemical oxidation of guanine. The sensor achieves sensitive detection of target nucleic acids (NA) through hybridization and mediator-assisted electrocatalysis.
Area of Science:
- Electrochemistry
- Biosensors
- Nucleic Acid Detection
Background:
- Nucleic acid (NA) detection is crucial in various fields.
- Developing sensitive and specific NA sensors remains a challenge.
- Electrochemical methods offer potential for sensitive biosensing.
Purpose of the Study:
- To develop a novel nucleic acid sensor.
- To utilize mediated electrochemical oxidation of guanine for NA detection.
- To investigate the sensor's performance and detection limits.
Main Methods:
- Oligonucleotide probes immobilized on tin-doped indium oxide (ITO) electrodes via a phosphonate monolayer.
- Carboxyl activation and C6 alkyl linker for probe attachment.
- Hybridization with complementary target NA.
- Detection using tris(2,2'-bipyridyl) ruthenium(II) redox mediator.
Main Results:
- The self-assembled monolayer on ITO facilitates mediator access.
- Electrocatalytic current is linearly proportional to bound guanine.
- Achieved a detection limit of 120 amoles of guanine per square centimeter.
- Sensor demonstrates sensitivity for target NA detection.
Conclusions:
- The developed sensor provides a sensitive method for nucleic acid detection.
- Mediated electrochemical oxidation of guanine is a viable detection strategy.
- The sensor design is suitable for detecting specific NA sequences.
Related Concept Videos
01:17Microbial Biosensors
Microbial biosensors are analytical devices that utilize living microbes to detect specific substances through measurable signals. These devices consist of two main components: biosensing organisms and signal-transducing elements. Biosensing organisms, such as Escherichia coli or Saccharomyces cerevisiae, are typically housed in multiwell plates connected to transducers, enabling rapid, real-time detection of target analytes.Signal Generation MechanismWhen a target analyte—such as...
03:31Labeling DNA Probes
DNA probes are fragments of DNA labeled with a reporter tag to enable their detection or purification. The resulting labeled DNA probes can then hybridize to target nucleic acid sequences through complementary base-pairing, and may be used to recover or identify these regions.
Radioisotopes, fluorophores, or small molecule binding partners like biotin or digoxigenin, are the most widely used reporter tags for labeling DNA probes. These labels can be attached to the probe DNA molecule via...
Radioisotopes, fluorophores, or small molecule binding partners like biotin or digoxigenin, are the most widely used reporter tags for labeling DNA probes. These labels can be attached to the probe DNA molecule via...