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Related Experiment Video

Updated: May 23, 2026

Phthalic Acid Ester-Binding DNA Aptamer Selection, Characterization, and Application to an Electrochemical Aptasensor
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A host-guest-recognition-based electrochemical aptasensor for thrombin detection.

Hao Fan1, Hui Li2, Qingjiang Wang2

  • 1Department of Pharmacy, Jiangxi University of Traditional Chinese Medicine, Jiangxi, China; Department of Chemistry, East China Normal University, 3663, Zhongshan Road (N), Shanghai, China.

Biosensors & Bioelectronics
|April 10, 2012
PubMed
Summary
This summary is machine-generated.

This study introduces a novel electrochemical aptasensor for sensitive thrombin detection. The sensor utilizes host-guest recognition to achieve highly accurate protein analysis, detecting thrombin down to 4.6 pM.

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Area of Science:

  • Biomedical Engineering
  • Analytical Chemistry
  • Nanotechnology

Background:

  • Thrombin is a key biomarker in hemostasis and thrombosis, making its accurate detection crucial for clinical diagnostics.
  • Existing methods for thrombin detection often face limitations in sensitivity, specificity, or complexity.
  • Aptasensors offer a promising alternative due to their high specificity and potential for miniaturization.

Purpose of the Study:

  • To develop a sensitive and reliable electrochemical aptasensor for the detection of thrombin.
  • To leverage host-guest recognition principles for enhanced sensing performance.
  • To establish a novel platform for protein detection using functionalized nanomaterials.

Main Methods:

  • Fabrication of an electrochemical aptasensor using a thrombin aptamer (TBA) immobilized on a gold electrode.
  • Dual labeling of the aptamer with a thiol and a dabcyl group for immobilization and host-guest interaction.
  • Preparation of a CdS nanoparticle-based electrochemical marker functionalized with β-cyclodextrins (CdS-CDs).
  • Utilizing the host-guest recognition between β-cyclodextrins and dabcyl for signal transduction.

Main Results:

  • The aptasensor demonstrated a sensitive response to thrombin binding, with the aptamer changing conformation upon target interaction.
  • Thrombin binding induced the release of CdS-CDs from the electrode surface, altering the electrochemical signal.
  • The developed aptasensor achieved a low detection limit of 4.6 pM for thrombin.
  • The host-guest recognition mechanism enabled efficient signal transduction for protein detection.

Conclusions:

  • The presented electrochemical aptasensor offers a highly sensitive and specific method for thrombin detection.
  • The integration of host-guest recognition and nanomaterials provides a robust platform for biosensing applications.
  • This approach holds potential for the development of advanced diagnostic tools for various biomarkers.