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Exploring Biomolecular Interaction Between the Molecular Chaperone Hsp90 and Its Client Protein Kinase Cdc37 using Field-Effect Biosensing Technology
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A complementary impedance spectroscopy biosensing method with graphene.

Munis Khan1, Ivan Mijakovic2, Santosh Pandit3

  • 1Chalmers University of Technology, Department of Microtechnology and Nanoscience, Gothenburg, SE41296, Sweden.

Biosensors & Bioelectronics
|April 12, 2026
PubMed
Summary
This summary is machine-generated.

A novel graphene biosensing platform offers sensitive biomarker detection by analyzing AC impedance. This bioelectronic sensor utilizes a new Y/X^2 metric for enhanced stability and miniaturization in diagnostics.

Keywords:
AC impedanceBaseline stabilityFunctional-layer capacitanceGraphene field-effect transistorY/X(2)-metric

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Area of Science:

  • Bioelectronics
  • Materials Science
  • Nanotechnology

Background:

  • Graphene field-effect transistors (GFETs) offer potential for sensitive biosensing.
  • Traditional Electrochemical Impedance Spectroscopy (EIS) has limitations in miniaturization and stability.
  • Need for robust and scalable bioelectronic sensing platforms for biomarker detection.

Purpose of the Study:

  • To develop a novel biosensing platform using a graphene liquid-gate field-effect transistor.
  • To introduce a new metric (Y/X^2) for sensitive and stable analyte detection.
  • To demonstrate the platform's suitability for reliable biomarker detection and bioelectronic sensing applications.

Main Methods:

  • Functionalization of a graphene liquid-gate field-effect transistor with a bioactive layer.
  • Measurement of complex AC impedance of the graphene channel.
  • Introduction and application of a novel Y/X^2 metric derived from impedance data.
  • Analysis of low-frequency impedance to determine effective capacitance.

Main Results:

  • The Y/X^2 metric shows high sensitivity to analyte presence.
  • The platform demonstrates excellent baseline stability, crucial for reliable detection.
  • The approach enables sensitive detection via analyte-induced changes in graphene impedance.
  • The technique supports biosensor miniaturization and stable operation.

Conclusions:

  • The developed graphene biosensing platform provides a sensitive and stable method for biomarker detection.
  • The novel Y/X^2 metric enhances the reliability of impedance-based biosensing.
  • This technology offers a practical pathway for scalable and robust bioelectronic sensing applications.