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Planar Hall magnetoresistive aptasensor for thrombin detection.

B Sinha1, T S Ramulu2, K W Kim2

  • 1Department of Materials Science and Engineering, Chungnam National University, Daejeon 305-764, South Korea.

Biosensors & Bioelectronics
|April 15, 2014
PubMed
Summary

This study presents a novel aptamer-based sensor for detecting human thrombin. The sensitive biosensor utilizes a planar Hall magnetoresistive sensor and magnetic labels, achieving a low detection limit for clinical diagnostics.

Keywords:
AptasensorPlanar Hall magnetoresistive sensorSandwichThrombin

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Area of Science:

  • Biomedical Engineering
  • Nanotechnology
  • Analytical Chemistry

Background:

  • Aptamer-based assays offer a promising avenue for disease research and clinical diagnostics.
  • Planar Hall magnetoresistive (PHR) sensors provide high resolution, a strong signal-to-noise ratio, and linear response, making them suitable for biosensing applications.

Purpose of the Study:

  • To develop a sensitive aptamer-based sandwich-type sensor for the detection of human thrombin.
  • To leverage the advantages of PHR sensors and superparamagnetic labels for enhanced biosensing capabilities.

Main Methods:

  • A PHR sensor with a gold layer was functionalized with a DNA aptamer for thrombin capture.
  • A polydimethylsiloxane well was used to standardize the sensor surface area and sample volume.
  • Streptavidin-functionalized magnetic labels were employed for signal amplification and real-time detection.

Main Results:

  • The aptasensor demonstrated a linear response to human thrombin concentrations ranging from 86 pM to 8.6 µM.
  • A highly sensitive detection limit of 86 pM was achieved.
  • The assay required a minimal sample volume of 2 µl.

Conclusions:

  • The developed aptasensor exhibits significant potential for clinical diagnostic applications.
  • The integration of PHR sensors and aptamer technology offers a sensitive and efficient platform for biomarker detection.