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Related Concept Videos

Microbial Biosensors01:17

Microbial Biosensors

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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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Preparation of Silicon Nanowire Field-effect Transistor for Chemical and Biosensing Applications
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Spin-enhanced nanodiamond biosensing for ultrasensitive diagnostics.

Benjamin S Miller1,2, Léonard Bezinge3, Harriet D Gliddon3

  • 1London Centre for Nanotechnology, University College London, London, UK. ben.miller.13@ucl.ac.uk.

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Fluorescent nanodiamonds offer ultrasensitive detection for in vitro diagnostics. This quantum diagnostics platform achieves high sensitivity for disease detection, outperforming traditional nanoparticle biosensors.

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Area of Science:

  • Quantum sensing
  • Nanotechnology
  • Biomedical diagnostics

Background:

  • Nitrogen-vacancy defects in diamond possess quantum spin properties applicable to quantum technologies.
  • Fluorescent nanodiamonds offer attractive characteristics for in vitro biosensing, such as brightness and cost-effectiveness.
  • Current nanoparticle biosensors often lack the sensitivity required for early disease detection.

Purpose of the Study:

  • To investigate fluorescent nanodiamonds as an ultrasensitive label for in vitro diagnostics.
  • To enhance biosensor sensitivity by modulating nanodiamond emission using microwave fields and frequency-domain analysis.

Main Methods:

  • Utilized fluorescent nanodiamonds as labels in a lateral flow assay.
  • Employed microwave fields to modulate nanodiamond emission intensity.
  • Applied frequency-domain analysis to distinguish signals from background autofluorescence.

Main Results:

  • Achieved a detection limit of 8.2 × 10⁻¹⁹ molar for biotin-avidin, 10⁵ times more sensitive than gold nanoparticles.
  • Demonstrated single-copy detection of HIV-1 RNA with a 10-minute isothermal amplification step.
  • Successfully validated the platform using a clinical plasma sample.

Conclusions:

  • Fluorescent nanodiamonds provide an ultrasensitive platform for in vitro diagnostics, significantly improving upon existing nanoparticle biosensors.
  • The quantum diagnostics platform is versatile and applicable to various diagnostic formats and diseases.
  • This technology holds potential for transforming early disease diagnosis, benefiting patient outcomes and public health.