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Fabrication of Electrochemical-DNA Biosensors for the Reagentless Detection of Nucleic Acids, Proteins and Small Molecules
Published on: June 1, 2011
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Electrochemical DNA Sensor Based on Carbon Black-Poly(Methylene Blue)-Poly(Neutral Red) Composite
Dominica Kappo1, Dmitry Shurpik1, Pavel Padnya1
1A.M. Butlerov' Chemistry Institute, Kazan Federal University, 18 Kremlevskaya Street, 420008 Kazan, Russia.
Biosensors
|May 28, 2022
Summary
A new electrochemical DNA sensor detects antitumor drugs like doxorubicin with high sensitivity. This sensor is crucial for assessing drug toxicity and potential DNA damage, showing promise for clinical applications.
Area of Science:
- Electrochemistry
- Biosensors
- Analytical Chemistry
Background:
- Detecting small molecules interacting with DNA is vital for evaluating antitumor drug hazards and understanding DNA damage.
- Existing methods for DNA interaction analysis require improvement in sensitivity and specificity.
Purpose of the Study:
- To develop a novel electrochemical DNA sensor for sensitive determination of antitumor drugs.
- To assess the sensor's capability in detecting doxorubicin as a model intercalator.
- To evaluate the sensor's performance in complex biological matrices.
Main Methods:
- Fabrication of a glassy carbon electrode modified with carbon black, pillar [5]arene, and electropolymerized methylene blue and neutral red.
- Utilizing water-soluble thiacalixarene to enhance DNA-dye interaction sensitivity.
- Electrochemical detection of doxorubicin via suppression of redox activity.
Main Results:
- The developed DNA sensor achieved sensitive detection of doxorubicin within a concentration range of 0.5 pM to 1.0 nM.
- A low limit of detection (0.13 pM) was achieved with a short incubation time (20 min).
- The sensor demonstrated successful application in analyzing spiked human plasma and doxorubicin medication samples.
Conclusions:
- The novel electrochemical DNA sensor offers a sensitive and rapid method for antitumor drug determination.
- The sensor shows potential for practical applications in clinical diagnostics and therapeutic drug monitoring.
- This approach provides a valuable tool for assessing DNA-damaging agents and their interactions.
