Antibody Labeling
Antibody Labeling - Related Videos
09:29
The Bioconjugation and Radiosynthesis of 89Zr-DFO-labeled Antibodies
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Cited by 81 •
2015
Due to its multi-day radioactive half-life and favorable decay properties, the positron-emitting radiometal 89Zr is extremely well-suited for use in antibody-based radiopharmaceuticals for PET imaging. In this protocol, the bioconjugation, radiosynthesis, and preclinical application of 89Zr-labeled antibodies will be described.
06:48
Antibody Labeling with Fluorescent Dyes Using Magnetic Protein A and Protein G Beads
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Cited by 3 •
2016
The on-bead method for labeling antibodies with small molecules enables labeling of a small amount of antibodies directly from cell media. This method is compatible with amine and thiol chemistry, and can handle multiple samples in parallel, manually or using automated platforms.
06:37
Preparation of Drosophila Polytene Chromosome Squashes for Antibody Labeling
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Cited by 28 •
2010
This video protocol illustrates the squash technique used in the Johansen laboratory to prepare Drosophila polytene chromosomes for antibody labeling.
03:28
Labeling Murine T Helper Lymphocytes using Radiolabeled Monoclonal Antibodies
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2025
In this video, we demonstrate the intracellular radiolabeling of T helper cells using radioactive isotope-conjugated monoclonal antibodies for non-invasive positron emission tomography imaging.
07:51
Single-Molecule Localization Microscopy of Membrane Proteins using Single-Antibody Labeling
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2026
This protocol describes single-antibody labeling (SAL) to resolve the nanoscale spatial organization of plasma membrane proteins. By leveraging cumulative antibody-epitope interactions at the single-molecule level, membrane SAL (mSAL) maps local epitope distributions while simultaneously capturing antibody binding behavior in the native cellular environment.
FAQs
The label-to-antibody ratio balances signal strength against preservation of antigen recognition. Adding more detectable molecules may increase the measurable signal, but excessive labeling can interfere with how the antibody binds its target. Controlling this ratio therefore helps researchers obtain strong, interpretable results while maintaining the antibody’s ability to recognize proteins, cells, or tissue targets.
Covalent attachment links a detectable molecule to amino acid residues on the antibody. The labeling conditions must be controlled so this chemical modification does not disrupt the antibody’s antigen-binding activity. When binding is preserved, the attached label can report the antibody’s location or support target capture without preventing recognition of the intended biological target.
These label types provide different ways to detect or handle antibody-bound targets. Fluorescent dyes generate signals suitable for localization and measurement, whereas enzymes produce detectable assay signals. Biotin supports capture, and nanoparticles can provide a detectable or isolatable tag. The appropriate choice depends on whether the experiment requires imaging, measurement, or target isolation.
Preparation should emphasize the labeling conditions and the label-to-antibody ratio. These variables influence both signal strength and the preservation of antigen recognition. After labeling, researchers need an antibody that still binds the intended target and produces a useful detectable or capture response. This balance determines whether the reagent performs reliably in a downstream assay.
Labeled antibodies support several common biological assays, including immunofluorescence microscopy, flow cytometry, western blotting, and enzyme-linked immunosorbent assays. In microscopy, the label helps locate targets; in flow cytometry, it supports cell measurement. Western blotting and enzyme-linked immunosorbent assays use labeled antibodies to detect proteins, with the resulting signal indicating target presence or amount.
The method connects antibody specificity with a measurable or isolatable output. In tissues, detectable labels help reveal where a target is located. In cell-based analysis, they support measurement of labeled cells, while protein assays use the signal to assess target presence or amount. This makes labeled antibodies useful across imaging, cellular analysis, and protein detection.