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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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A Label-free Technique for the Spatio-temporal Imaging of Single Cell Secretions

Published on: November 23, 2015

Sensing using localised surface plasmon resonance sensors.

Sabine Szunerits1, Rabah Boukherroub

  • 1Institut de Recherche Interdisciplinaire, Université Lille1, Parc de la Haute Borne, 50 avenue de Halley, BP 70478, 59658 Villeneuve d'Ascq, France. sabine.szunerits@iri.univ-lille1.fr

Chemical Communications (Cambridge, England)
|July 19, 2012
PubMed
Summary
This summary is machine-generated.

Noble metal nanoparticles, like gold and silver, are advanced as ultra-sensitive optical sensors. Their localized surface plasmon resonance (LSPR) shifts detect molecular binding, enabling label-free sensing applications.

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Area of Science:

  • Nanotechnology and Materials Science
  • Optical Sensing and Spectroscopy

Background:

  • Noble metal nanoparticles have historically been used for their vibrant colors and optical properties.
  • Recent advancements focus on their application as highly sensitive, label-free optical sensors.
  • Plasmonic nanoparticles function as transducers, converting refractive index changes into LSPR spectral shifts.

Purpose of the Study:

  • To review fabrication methods for plasmonic nanosensors.
  • To emphasize techniques for linking plasmonic nanostructures to surfaces.
  • To differentiate between bulk and near-field refractive index sensing.

Main Methods:

  • Discussion of various fabrication techniques for plasmonic nanosensors.
  • Focus on surface functionalization and immobilization strategies.
  • Exploration of methods for creating stable localized surface plasmon resonance (LSPR) sensors.

Main Results:

  • Plasmonic nanoparticles enable label-free optical sensing through LSPR shifts.
  • Molecular recognition elements provide specificity and selectivity for analyte detection.
  • Distinction between bulk and near-field refractive index sensing is crucial for sensor design.

Conclusions:

  • Plasmonic nanosensors offer a versatile platform for sensitive molecular detection.
  • Advancements in surface functionalization are key to developing stable and effective sensors.
  • Understanding refractive index sensing modes is vital for optimizing nanosensor performance.