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Related Experiment Videos

A novel electrochemical detection method for aptamer biosensors.

Gyeong Sook Bang1, Suhyeong Cho, Byung-Gee Kim

  • 1School of Chemical and Biological Engineering and Institute of Molecular Biology and Genetics, Seoul National University, Kwanak-ku, South Korea.

Biosensors & Bioelectronics
|November 1, 2005
PubMed
Summary

A novel electrochemical biosensor detects thrombin using a beacon aptamer. This aptamer-based biosensor shows a significant decrease in electrical signal upon thrombin binding, enabling selective detection.

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Area of Science:

  • Biomedical Engineering
  • Analytical Chemistry
  • Molecular Biology

Background:

  • Thrombin is a key biomarker in coagulation and various diseases.
  • Development of sensitive and selective biosensors for thrombin detection is crucial for clinical diagnostics.
  • Electrochemical methods offer advantages in terms of sensitivity, cost-effectiveness, and miniaturization.

Purpose of the Study:

  • To develop and characterize a novel beacon aptamer-based electrochemical biosensor for thrombin detection.
  • To investigate the electrochemical response of the biosensor upon thrombin binding.
  • To evaluate the sensitivity, selectivity, and linear range of the developed biosensor.

Main Methods:

  • Fabrication of a gold surface modified with a beacon aptamer linked via a primary aliphatic amine.

Related Experiment Videos

  • Intercalation of methylene blue (MB) as an electrochemical marker into the aptamer sequence.
  • Electrochemical transduction using voltammetry to monitor changes in MB signal.
  • Conformational change of the beacon aptamer upon thrombin binding leading to MB release.

    • Main Results:

    • A decrease in the electrochemical signal (electrical current intensity) was observed due to MB release upon thrombin binding.
    • The biosensor demonstrated a linear detection range for thrombin from 0 to 50.8 nM with a high correlation factor (0.999).
    • The developed method achieved a selective detection limit of 11 nM for thrombin.

    Conclusions:

    • The developed beacon aptamer-based electrochemical biosensor provides a sensitive and selective platform for thrombin detection.
    • The conformational change of the aptamer upon target binding is effectively translated into a measurable electrochemical signal.
    • This biosensor holds potential for applications in clinical diagnostics and biomedical research requiring thrombin monitoring.