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Related Concept Videos

Immunogold Electron Microscopy01:20

Immunogold Electron Microscopy

5.1K
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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Labeling DNA Probes03:31

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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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Updated: Dec 25, 2025

Antibody Labeling with Fluorescent Dyes Using Magnetic Protein A and Protein G Beads
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Antibody Labeling with Fluorescent Dyes Using Magnetic Protein A and Protein G Beads

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Labeling Antibodies Using Colloidal Gold.

Eric A Berg, Jordan B Fishman

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    Summary
    This summary is machine-generated.

    Colloidal gold nanoparticles are easily prepared for microscopy. These gold-antibody conjugates enable multiple labeling in electron microscopy and light microscopy applications.

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    Area of Science:

    • Nanotechnology
    • Bioconjugation
    • Microscopy

    Background:

    • Colloidal gold, an aqueous suspension of gold nanoparticles, is versatile for biological applications.
    • Gold nanoparticles can be synthesized using chemical reduction, typically of chloroauric acid with sodium citrate.
    • The size of gold particles can be controlled for specific microscopic detection.

    Purpose of the Study:

    • To describe the preparation and utility of colloidal gold-antibody conjugates.
    • To highlight their application in various microscopy techniques.
    • To provide a method for creating versatile labeling agents.

    Main Methods:

    • Synthesis of colloidal gold nanoparticles via sodium citrate reduction of chloroauric acid.
    • Conjugation of gold nanoparticles with antibodies.
    • Microscopic visualization and differentiation of labeled targets.

    Main Results:

    • Successfully prepared colloidal gold-antibody conjugates with controllable particle sizes.
    • Demonstrated the utility of these conjugates in microscopic imaging.
    • Established a method for multiple-labeling experiments using size-differentiated gold particles.

    Conclusions:

    • Colloidal gold-antibody conjugates are readily prepared and highly effective for microscopic applications.
    • Their size tunability allows for multiplexed detection in advanced imaging.
    • Applicable in electron microscopy and adaptable for light microscopy with silver enhancement.