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Related Concept Videos

Immunogold Electron Microscopy01:20

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Immunoelectron microscopy utilizes immunogold labeling of endogenous proteins with specific antibodies to detect and localize these proteins in cells and tissues. The procedure provides insights into the distribution and quantification of protein under different stimulation conditions offering clues about their functions. Conjugating highly electron-dense gold particles with primary or secondary antibodies allow antigen detection on and within cells, with high resolution and specificity.
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A Method for Selecting Structure-switching Aptamers Applied to a Colorimetric Gold Nanoparticle Assay
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Shape-Specific Gold Nanoparticles for Multiplex Biosensing Applications.

Shixi Zhang1,2, Yuhan Zhang1,2, Jiaye Jiang1,2

  • 1Sino-Swiss Institute of Advanced Technology (SSIAT), Shanghai University, Shanghai 201899, China.

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|September 9, 2024
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Summary
This summary is machine-generated.

This study introduces a novel colorimetric nanobiosensor for detecting influenza and SARS-CoV-2 viruses simultaneously. The gold nanoparticle-based sensor offers rapid, equipment-free pathogen identification with high sensitivity.

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Area of Science:

  • Nanotechnology
  • Biosensing
  • Virology

Background:

  • Multiplex analyte detection is crucial for diagnostics but faces challenges.
  • Established methods like PCR and ELISA are effective but can be complex.
  • There is a need for rapid, accessible diagnostic tools for multiple pathogens.

Purpose of the Study:

  • To develop a colorimetric nanobiosensor for simultaneous detection of influenza A virus and SARS-CoV-2.
  • To utilize functionalized gold nanoparticles with distinct morphologies for multiplexed detection.
  • To create a visually interpretable diagnostic system without specialized equipment.

Main Methods:

  • Functionalized gold nanospheres (GNSp) with influenza A-specific oligonucleotides.
  • Functionalized gold nanoshells (GNSh) with SARS-CoV-2-specific oligonucleotides.
  • Exploited target-induced DNA-DNA interactions to control nanoparticle aggregation and color change.

Main Results:

  • The nanobiosensor exhibited distinct colorimetric responses: indigo for SARS-CoV-2, blue for Influenza A, and purple for both.
  • Achieved analytical sensitivity of 100 nM for target detection.
  • Demonstrated no cross-reactivity with other potential pathogens, ensuring specificity.

Conclusions:

  • The developed gold nanoparticle-based nanobiosensor enables rapid, simultaneous, and visual detection of influenza A and SARS-CoV-2.
  • This technology offers a promising alternative for point-of-care diagnostics, requiring no specialized equipment or personnel.
  • The system addresses the need for efficient multiplex pathogen identification in a single sample.