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Related Concept Videos

Enzyme-Linked Immunosorbent Assay01:33

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Development and Functionalization of Electrolyte-Gated Graphene Field-Effect Transistor for Biomarker Detection
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A Label-Free Immunosensor for IgG Based on an Extended-Gate Type Organic Field Effect Transistor.

Tsukuru Minamiki1, Tsuyoshi Minami2, Ryoji Kurita3

  • 1Research Center for Organic Electronics (ROEL), Graduate School of Science and Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan. tey14898@st.yamagata-u.ac.jp.

Materials (Basel, Switzerland)
|August 10, 2017
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Summary

A new biosensor uses an organic field-effect transistor (OFET) to detect immunoglobulin G (IgG). This novel device shows promise for sensitive and low-voltage immunosensing applications.

Keywords:
immunoglobulin Gimmunosensorlabel-freeorganic field effect transistorself-assembled monolayer

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Area of Science:

  • Biosensors
  • Organic electronics
  • Immunotechnology

Background:

  • Immunoglobulin G (IgG) is a crucial biomarker in various physiological and pathological processes.
  • Developing sensitive and efficient detection methods for IgG is essential for diagnostics.
  • Organic field-effect transistors (OFETs) offer potential for low-cost, flexible biosensing platforms.

Purpose of the Study:

  • To develop a novel biosensor for immunoglobulin G (IgG) detection.
  • To utilize an extended-gate type organic field-effect transistor (OFET) for enhanced sensitivity.
  • To demonstrate low-voltage operation of the developed immunosensor.

Main Methods:

  • Immobilization of anti-IgG antibodies onto the extended-gate electrode of an OFET.
  • Operation of the OFET-based biosensor at voltages below 3 V.
  • Analysis of OFET transfer curves in response to varying IgG concentrations in the presence of bovine serum albumin.

Main Results:

  • The biosensor exhibited a negative shift in the OFET transfer curve with increasing IgG concentration, indicating successful detection.
  • A linear detection range from 0 to 10 µg/mL for IgG was achieved.
  • A low detection limit of 0.62 µg/mL (4 nM) for IgG was determined.
  • The biosensor demonstrated effective performance in the presence of a bovine serum albumin interferent.

Conclusions:

  • The developed extended-gate OFET biosensor is effective for sensitive IgG detection.
  • The biosensor operates at low voltages, making it suitable for portable applications.
  • This technology opens new avenues for OFET-based immunosensing platforms.