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Related Experiment Videos

Development of fluorescence change-based, reagent-less optic immunosensor.

Satoka Aoyagi1, Masahiro Kudo

  • 1Department of Applied Physics, Seikei University, 3-3-1, Kichijoji-kitamachi, Musashino-shi, Tokyo 180-8633, Japan.

Biosensors & Bioelectronics
|January 1, 2005
PubMed
Summary
This summary is machine-generated.

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A novel optic immunosensor detects immunoglobulin G (IgG) without reagents. This portable device uses fluorescently labeled protein A and optic fibers, showing decreased fluorescence intensity with increasing IgG concentration.

Area of Science:

  • Biomedical Engineering
  • Biosensing Technology
  • Immunotechnology

Background:

  • Development of sensitive and specific diagnostic tools is crucial for disease detection.
  • Existing immunosensors often require reagents or lack portability, limiting their practical application.
  • Protein A's specific binding to immunoglobulin G (IgG) offers a basis for immunoassay development.

Purpose of the Study:

  • To develop a reagent-less, regenerable, and portable optic immunosensor for detecting immunoglobulin G (IgG).
  • To investigate the sensor's performance based on fluorescence intensity changes upon protein-protein interactions.
  • To evaluate both steady-state and transient fluorescence responses for IgG quantification.

Main Methods:

  • Fabrication of an optic immunosensor using a glass plate immobilized with Qdot-labeled protein A.

Related Experiment Videos

  • Integration of the immobilized plate with optic fibers for excitation and fluorescence emission.
  • Measurement of fluorescence intensity changes in response to varying concentrations of IgG in a phosphate-buffered saline solution.

    • Main Results:

    • The optic immunosensor demonstrated a decrease in fluorescence intensity upon binding of IgG to Qdot-labeled protein A.
    • The fluorescence decrease correlated with IgG concentration in both steady-state and transient phases.
    • The system proved to be reagent-less, regenerable, and portable, suitable for on-site detection.

    Conclusions:

    • The developed optic immunosensor is a viable tool for sensitive and specific IgG detection.
    • The reagent-less and portable nature of the sensor enhances its potential for clinical diagnostics and field applications.
    • Fluorescence intensity changes serve as a reliable indicator for IgG quantification in real-time.