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A sensitive nanoporous gold-based electrochemical aptasensor for thrombin detection.

Huajun Qiu1, Yanli Sun, Xirong Huang

  • 1Key Laboratory of Colloid and Interface Chemistry of the Ministry of Education of China, Shandong University, Jinan 250100, PR China.

Colloids and Surfaces. B, Biointerfaces
|May 11, 2010
PubMed
Summary

A new nanoporous gold (NPG) electrochemical aptasensor was developed for sensitive thrombin detection. This NPG-based sensor offers a highly effective method for quantifying thrombin in biological samples.

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Area of Science:

  • Electrochemistry
  • Nanomaterials Science
  • Biomedical Sensing

Background:

  • Thrombin detection is crucial for diagnosing and monitoring various hemostatic and thrombotic disorders.
  • Existing methods for thrombin detection often face limitations in sensitivity, selectivity, or complexity.
  • Nanoporous gold (NPG) offers unique electrochemical properties and a high surface area for biosensor development.

Purpose of the Study:

  • To develop a novel electrochemical aptasensor for sensitive and selective thrombin detection.
  • To fabricate a robust NPG substrate using a facile one-step square wave potential pulse (SWPP) treatment.
  • To enhance the sensor's performance through a layer-by-layer assembly strategy incorporating gold nanoparticles (AuNPs).

Main Methods:

  • In situ fabrication of NPG electrode via SWPP treatment, leading to a 34-fold increase in active surface area.

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  • Layer-by-layer assembly of aptamer-modified NPG and aptamer-modified AuNPs to form a "sandwich" structure.
  • Electrochemical signal detection using chronocoulometry with [Ru(NH(3))(6)](3+) as the redox probe, measuring electrostatic interactions with ssDNA.

    • Main Results:

    • The NPG-based aptasensor achieved quantitative detection of thrombin in the range of 0.01-22 nM.
    • A remarkably low detection limit of 30 fM was achieved, demonstrating high sensitivity.
    • The sensor exhibited excellent selectivity against non-target molecules, along with good stability and reusability.

    Conclusions:

    • The developed NPG-based electrochemical aptasensor provides a highly sensitive and selective platform for thrombin detection.
    • The combination of NPG and AuNPs amplification effects significantly enhances sensor performance.
    • This novel aptasensor holds great potential for clinical diagnostics and biomedical research applications.