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Related Concept Videos

Immunogold Electron Microscopy01:20

Immunogold Electron Microscopy

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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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Related Experiment Video

Updated: Apr 16, 2026

Rapid Nanoprobe Signal Enhancement by In Situ Gold Nanoparticle Synthesis
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Nanogold bioconjugates for direct and sensitive multiplexed immunosensing.

P Dobosz1, S Morais1, R Puchades1

  • 1Instituto Interuniversitario de Reconocimiento Molecular y Desarrollo Tecnológico (IDM), Departamento de Química, Universitat Politècnica de València, Camino de Vera s/n, 46071 Valencia, Spain.

Biosensors & Bioelectronics
|March 16, 2015
PubMed
Summary

Nanogold bioconjugates enable sensitive and cost-effective antibody-antigen detection in immunosensing. Smaller gold nanoparticles improve assay performance for direct detection of small molecules.

Keywords:
ImmunoassayMicroarrayingMultiplexNano-goldTracers

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Area of Science:

  • Bioconjugate chemistry
  • Nanotechnology
  • Immunosensing

Background:

  • Direct detection of antibody-antigen reactions is crucial for diagnostics.
  • Existing immunosensing techniques can be limited by sensitivity, selectivity, or cost.
  • Gold nanoparticles offer unique optical and electronic properties for signal amplification.

Purpose of the Study:

  • To evaluate nanogold bioconjugates for direct antibody-antigen immunoreaction detection.
  • To investigate the impact of gold nanoparticle size and coating density on assay performance.
  • To demonstrate the utility of nanogold bioconjugates in sensitive and selective immunosensing assays.

Main Methods:

  • Synthesis and characterization of spherical nanogold particles.
  • Optimization of antibody conjugation and coating density.
  • Application in microarray immunosensing and compact disc detection techniques.
  • Determination of small molecules (sulfasalazine and atrazine) using nanogold bioconjugates.

Main Results:

  • Smaller gold nanoparticles demonstrated superior performance in antibody-antigen detection.
  • The gold labeling method did not compromise protein recognition capabilities.
  • Achieved high sensitivity (0.03 μg/L for sulfasalazine, 1.3 μg/L for atrazine) with high reproducibility (RSD < 10%).
  • Demonstrated simultaneous and direct determination of small molecules.

Conclusions:

  • Nanogold bioconjugates provide a sensitive, selective, and cost-effective platform for direct immunosensing.
  • The developed method is robust, reliable, and suitable for high-throughput analysis.
  • This approach holds promise for simultaneous detection of diverse molecular targets in various applications.