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Dual-modality microfluidic biosensor based on nanoengineered mesoporous graphene hydrogels.

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Summary
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This study introduces a novel dual-modality microfluidic biosensor using cysteine-graphene hydrogel for detecting human cardiac myoglobin (cMb). The advanced biosensor offers high sensitivity and reliability for cMb quantification in serum samples.

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Analytical Chemistry

Background:

  • Early detection of cardiac conditions relies on accurate biomarkers like human cardiac myoglobin (cMb).
  • Existing detection methods face challenges in sensitivity, speed, and reliability for point-of-care diagnostics.
  • Novel biosensor platforms are needed to overcome these limitations for improved cardiac patient management.

Purpose of the Study:

  • To develop and characterize a dual-modality microfluidic biosensor for sensitive and reliable quantification of human cardiac myoglobin (cMb).
  • To investigate the performance of a mesoporous nanostructured cysteine-graphene hydrogel as a sensing electrode.
  • To evaluate the biosensor's efficacy in detecting cMb in serum samples using electrochemical and surface plasmon resonance techniques.

Main Methods:

  • Fabrication of a microfluidic biosensor chip incorporating a mesoporous nanostructured cysteine-graphene (Cys-RGO) hydrogel.
  • Dual-modality detection using differential pulse voltammetry (DPV) and surface plasmon resonance (SPR).
  • Quantification of human cardiac myoglobin (cMb) in serum samples and kinetic analysis.

Main Results:

  • The Cys-RGO hydrogel exhibited excellent electrochemical and SPR sensing properties due to its high surface reactivity, mesoporous structure, and fast electron transfer.
  • Electrochemical detection achieved a sensitivity of 196.66 μA ng⁻¹ mL cm⁻² with a low limit of detection (LOD) of 4 pg mL⁻¹ for cMb.
  • SPR detection demonstrated a LOD of 10 pg mL⁻¹ for cMb, with real-time dynamic tracking and high association/dissociation constants.

Conclusions:

  • The developed dual-modality microfluidic biosensor, utilizing Cys-RGO hydrogel, provides a highly sensitive, reliable, and efficient platform for cMb detection.
  • The biosensor's self-verification and reduced false readout capabilities enhance detection reliability for clinical applications.
  • This technology holds promise for rapid and accurate diagnosis of cardiac events, improving patient outcomes.