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Related Concept Videos

Immunogold Electron Microscopy01:20

Immunogold Electron Microscopy

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.
Labeling DNA Probes03:31

Labeling DNA Probes

DNA probes are fragments of DNA labeled with a reporter tag to enable their detection or purification. The resulting labeled DNA probes can then hybridize to target nucleic acid sequences through complementary base-pairing, and may be used to recover or identify these regions.
Radioisotopes, fluorophores, or small molecule binding partners like biotin or digoxigenin, are the most widely used reporter tags for labeling DNA probes. These labels can be attached to the probe DNA molecule via...

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Related Experiment Video

Updated: Jun 17, 2026

Rapid Nanoprobe Signal Enhancement by In Situ Gold Nanoparticle Synthesis
07:30

Rapid Nanoprobe Signal Enhancement by In Situ Gold Nanoparticle Synthesis

Published on: March 7, 2018

Colloidal gold/streptavidin methods.

Constance Oliver1

  • 1Department of Cell and Molecular Biology, Faculdade de Medicina de Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil.

Methods in Molecular Biology (Clifton, N.J.)
|December 17, 2009
PubMed
Summary
This summary is machine-generated.

Streptavidin-gold detection systems offer a reliable method for immunocytochemistry and molecular biology. This technique minimizes nonspecific binding, enhancing accuracy in electron microscopy and postembedding labeling procedures.

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Area of Science:

  • Immunocytochemistry
  • Molecular Biology
  • Electron Microscopy

Background:

  • Biotin-avidin systems leverage the high affinity between biotin and avidin.
  • Avidin's nonspecific binding issues led to the development of streptavidin.
  • Streptavidin is preferred for immunocytochemical procedures due to reduced nonspecific binding.

Purpose of the Study:

  • To detail the application of streptavidin-gold for postembedding labeling.
  • To highlight the advantages of streptavidin-based detection systems.
  • To provide a guide for utilizing streptavidin-gold in electron microscopy.

Main Methods:

  • Utilizing biotinylated secondary antibodies with streptavidin-gold conjugates.
  • Employing unlabeled primary antibodies in a common protocol.
  • Exploring direct biotinylation of primary antibodies for simplified detection.

Main Results:

  • Streptavidin-gold systems provide effective postembedding immunolabeling.
  • The method demonstrates high specificity and reduced background noise.
  • Optimized protocols ensure reliable detection in electron microscopy.

Conclusions:

  • Streptavidin-gold detection is a robust technique for immunocytochemistry.
  • This method enhances signal-to-noise ratio in electron microscopy applications.
  • The chapter provides essential guidance for implementing streptavidin-gold labeling.