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Biosensor for Detection of Antibiotic Resistant Staphylococcus Bacteria
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A capacitive biosensor for detection of staphylococcal enterotoxin B.

Mahmoud Labib1, Martin Hedström, Magdy Amin

  • 1Department of Biotechnology, Lund University, P. O. Box 124, 221 00, Lund, Sweden.

Analytical and Bioanalytical Chemistry
|December 20, 2008
PubMed
Summary

A novel flow-injection capacitive biosensor offers highly sensitive detection of staphylococcal enterotoxin B (SEB). This method achieves rapid, reliable SEB quantification, crucial for food safety and clinical diagnostics.

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Area of Science:

  • Biotechnology
  • Biosensor Technology
  • Analytical Chemistry

Background:

  • Staphylococcal enterotoxin B (SEB) is a potent toxin produced by Staphylococcus aureus.
  • Accurate detection of SEB is critical for food safety and clinical diagnostics.
  • Existing detection methods may lack sensitivity or speed.

Purpose of the Study:

  • To develop a sensitive and rapid detection method for SEB.
  • To utilize a flow-injection capacitive biosensor for SEB quantification.
  • To validate the biosensor's performance against established methods.

Main Methods:

  • Purification of SEB from Staphylococcus aureus culture filtrate using ion-exchange and gel filtration chromatography.
  • Preparation of horseradish peroxidase-labeled anti-SEB antibody.
  • Development and optimization of a flow-injection capacitive biosensor assay.
  • Comparison with sandwich-enzyme-linked immunosorbent assay (ELISA).

Main Results:

  • The capacitive biosensor demonstrated high sensitivity, detecting SEB down to 0.3 pg/mL.
  • Linearity was observed from 2.8 pg/mL to 2.8 ng/mL with a response time of approximately 10 minutes.
  • The biosensor showed good agreement with ELISA for SEB detection in purification samples.
  • Recovery rates after purification steps were 88%, 74%, and 12%.

Conclusions:

  • A simple, sensitive, and reusable capacitive biosensor for SEB detection was successfully developed.
  • The biosensor offers a rapid and reliable alternative for SEB quantification.
  • This technology has potential applications in food safety and clinical settings.