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A Microfluidic-based Electrochemical Biochip for Label-free DNA Hybridization Analysis
14:53

A Microfluidic-based Electrochemical Biochip for Label-free DNA Hybridization Analysis

Published on: September 10, 2014

Multifunctional label-free electrochemical biosensor based on an integrated aptamer.

Yan Du1, Bingling Li, Hui Wei

  • 1State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, People's Republic of China.

Analytical Chemistry
|June 5, 2008
PubMed
Summary

This study presents a reusable, label-free electrochemical biosensor for simultaneously detecting adenosine triphosphate (ATP) and alpha-thrombin using aptamers. The novel aptasensor demonstrates high sensitivity and regeneration capabilities for parallel analysis.

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Area of Science:

  • Biomedical Engineering
  • Analytical Chemistry
  • Molecular Biology

Background:

  • Aptamers offer advantages over traditional recognition elements in biosensor design.
  • Developing multifunctional biosensors for simultaneous detection of multiple analytes is crucial.

Purpose of the Study:

  • To develop a multifunctional, reusable, label-free electrochemical biosensor for parallel detection of ATP and alpha-thrombin.
  • To integrate both ATP and alpha-thrombin binding aptamers onto a single sensing platform.

Main Methods:

  • Fabrication of a gold electrode modified with a DNA duplex containing a mixed aptamer (MBA).
  • The MBA incorporates both ATP-binding aptamer (ABA) and alpha-thrombin-binding aptamer (TBA).
  • Utilized electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) for detection.

Main Results:

  • Achieved a detection limit of 1 x 10(-8) M for ATP and 1 x 10(-11) M for alpha-thrombin.
  • Demonstrated the biosensor's ability to detect both analytes in parallel and sequentially.
  • Successfully regenerated the sensing interface for multiple detection cycles.
  • Showed detectability in biological fluids, indicating practical applicability.

Conclusions:

  • The developed aptasensor is label-free, highly sensitive, and reusable.
  • It enables multifunctional recognition for parallel detection of ATP and alpha-thrombin.
  • The biosensor shows significant potential for integrated sensing and multiplexed analysis in biological samples.