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The Use of a &#946;-lactamase-based Conductimetric Biosensor Assay to Detect Biomolecular Interactions
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Erythrocyte-camouflaged biosensor for α-hemolysin detection.

Insu Kim1, Yonghwan Kim2, Sang Won Lee1

  • 1School of Biomedical Engineering, Korea University, Seoul 02841, South Korea.

Biosensors & Bioelectronics
|May 2, 2021
PubMed
Summary
This summary is machine-generated.

A novel erythrocyte-camouflaged biosensor (ECB) detects Staphylococcus aureus alpha-hemolysin (Hla) with high sensitivity and accuracy. This innovation offers a promising tool for rapid point-of-care diagnostics of S. aureus infections.

Keywords:
BiosensorCell membraneElectrochemical impedance spectroscopyErythrocyteα-hemolysin

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Area of Science:

  • Biomedical Engineering
  • Biosensor Technology
  • Infectious Disease Diagnostics

Background:

  • Staphylococcus aureus infections pose significant health risks, necessitating rapid diagnostic tools.
  • Current point-of-care tests for S. aureus lack sufficient speed and accuracy.
  • Alpha-hemolysin (Hla), secreted by S. aureus, is a key virulence factor that interacts with erythrocyte membranes.

Purpose of the Study:

  • To develop a novel biosensor for the sensitive and accurate detection of Staphylococcus aureus alpha-hemolysin (Hla).
  • To utilize erythrocyte membranes as bioreceptors for fabricating an erythrocyte-camouflaged biosensor (ECB).
  • To evaluate the performance of the ECB for Hla detection in various conditions.

Main Methods:

  • Fabrication of erythrocyte-camouflaged biosensors (ECBs) by coating erythrocyte membranes (EM) onto electrochemical impedance electrodes.
  • Verification of EM presence on ECB using confocal microscopy and atomic force microscopy.
  • Detection of Hla spiked in phosphate buffer saline and human serum, and assessment of sensor selectivity against other blood proteins.

Main Results:

  • ECBs demonstrated sensitive detection of Hla with a detection limit of 1.9 ng/ml and a dynamic range of 0.0001-1 mg/ml.
  • The sensor exhibited significantly higher sensitivity to Hla compared to major blood proteins (8.8-12.7 times higher signal intensity).
  • The ECB maintained consistent sensing performance with 99.0 ± 5.6% accuracy over 35 days of storage.

Conclusions:

  • Erythrocyte membranes are effective bioreceptors for developing Hla-detecting biosensors.
  • The developed erythrocyte-camouflaged biosensor (ECB) offers a sensitive, selective, and stable platform for Hla detection.
  • This ECB technology holds potential for rapid point-of-care diagnostics of Staphylococcus aureus infections.