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In humans, electrolytes play a vital role in various physiological processes. Balancing electrolyte levels is essential for normal body functions; their imbalance can be life-threatening. The major electrolytes include sodium, potassium, chloride, calcium, phosphate, and bicarbonate. They are primarily involved in physiological processes, such as nerve signal transmission, membrane trafficking, muscle contraction, buffering body fluids, and balancing water levels in the body.
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Development and Functionalization of Electrolyte-Gated Graphene Field-Effect Transistor for Biomarker Detection
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Matrix Effect Study and Immunoassay Detection Using Electrolyte-Gated Graphene Biosensor.

Jianbo Sun1, Yuxin Liu2

  • 1Lane Department of Computer Science and Electrical Engineering, West Virginia University, Morgantown, WV 26506, USA. jnsun@mix.wvu.edu.

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|November 15, 2018
PubMed
Summary
This summary is machine-generated.

Electrolyte matrix effects significantly impact electrolyte-gated graphene field-effect transistor (EGGFET) biosensor sensitivity. A novel multichannel EGGFET immunoassay mitigates these effects for reliable human immunoglobulin G detection.

Keywords:
electrolyte-gated field effect transistorgrapheneimmunoassaymatrix effect

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Area of Science:

  • Materials Science
  • Biosensors
  • Nanotechnology

Background:

  • Electrolyte-gated graphene field-effect transistor (EGGFET) biosensors show promise but remain proof-of-concept.
  • Electrolyte matrix composition, pH, and ionic strength critically influence EGGFET performance.
  • Interfacial polarization effects modulate graphene's Fermi level, impacting biosensor sensitivity and reliability.

Purpose of the Study:

  • To investigate electrolyte matrix effects on EGGFET biosensor performance.
  • To develop a robust EGGFET immunoassay mitigating matrix effects for accurate detection.
  • To demonstrate the EGGFET immunoassay's capability for detecting human immunoglobulin G (IgG) in serum.

Main Methods:

  • Studied variations in electrolyte composition, pH, and ionic strength.
  • Developed a multichannel EGGFET immunoassay design for in-situ calibration and validation.
  • Quantified human IgG detection using the developed EGGFET immunoassay.

Main Results:

  • Electrolyte matrix variations significantly alter graphene Fermi level and EGGFET sensitivity.
  • The multichannel EGGFET immunoassay achieved a detection range of 2–50 nM for human IgG.
  • The assay demonstrated a coefficient of variation <20% and recovery rates of 85–95%.

Conclusions:

  • Electrolyte matrix effects pose a significant challenge for EGGFET biosensor accuracy.
  • The developed multichannel EGGFET immunoassay effectively regulates matrix effects.
  • This label-free, microfluidic-compatible assay shows strong potential for point-of-care diagnostics.