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Microbial Biosensors01:17

Microbial Biosensors

Microbial biosensors are analytical devices that utilize living microbes to detect specific substances through measurable signals. These devices consist of two main components: biosensing organisms and signal-transducing elements. Biosensing organisms, such as Escherichia coli or Saccharomyces cerevisiae, are typically housed in multiwell plates connected to transducers, enabling rapid, real-time detection of target analytes.Signal Generation MechanismWhen a target analyte—such as...

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A Label-free Technique for the Spatio-temporal Imaging of Single Cell Secretions
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Development of a biosensor microarray towards food screening, using imaging surface plasmon resonance.

Sabina Rebe Raz1, Maria G E G Bremer, Marcel Giesbers

  • 1RIKILT - Institute of Food Safety, Wageningen UR, P.O. Box 230, 6700 AE Wageningen, The Netherlands.

Biosensors & Bioelectronics
|July 9, 2008
PubMed
Summary
This summary is machine-generated.

This study explored direct and competitive immunoassays on a microarray using imaging surface plasmon resonance (iSPR). While direct assays showed low sensitivity, competitive assays for gentamicin and neomycin achieved ng/mL detection limits, suitable for food safety.

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Area of Science:

  • Analytical Chemistry
  • Biotechnology
  • Biosensor Technology

Background:

  • Microarray-based immunoassays offer potential for high-throughput analysis.
  • Imaging Surface Plasmon Resonance (iSPR) is an emerging technology for label-free detection.

Purpose of the Study:

  • To evaluate the feasibility of direct and competitive immunoassay formats on a microarray using the IBIS iSPR system.
  • To assess the performance of iSPR for detecting both small and large molecules.

Main Methods:

  • Optical performance evaluation of the IBIS iSPR system using glycerol calibration.
  • Development of a direct immunoassay for bovine IgG.
  • Development of a competitive immunoassay for gentamicin and neomycin detection.

Main Results:

  • IBIS iSPR demonstrated uniform sensitivity across regions of interest despite baseline variability.
  • Direct immunoassay for bovine IgG showed limited sensitivity due to low immobilization efficiency.
  • Competitive immunoassay achieved ng/mL sensitivity for gentamicin and neomycin, comparable to established methods and relevant for food safety regulations.

Conclusions:

  • The IBIS iSPR system shows promise for simultaneous detection of various compounds in food analysis.
  • Challenges in assay transfer to microarray platforms, particularly immobilization efficiency, require further investigation.
  • Competitive immunoassays on iSPR microarrays are viable for detecting small molecule contaminants at regulatory levels.