Sandwich Elisa
Sandwich Elisa - Related Videos
14:22
ELISA Assays: Indirect, Sandwich, and Competitive
0 Views •
2023
Source: Whitney Swanson1,2, Frances V. Sjaastad2,3, and Thomas S. Griffith1,2,3,4 1 Department of Urology, University of Minnesota, Minneapolis, MN 55455 2 Center for Immunology, University of Minnesota, Minneapolis, MN 55455 3 Microbiology, Immunology, and Cancer Biology Graduate Program, University of Minnesota, Minneapolis, MN 55455 4 Masonic Cancer Center, University of Minnesota, Minneapolis, MN 55455 Enzyme-linked immunosorbent assay (ELISA) is frequently used to measure the presence...
10:06
The ELISA Method
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2023
An enzyme-linked immunosorbent assay (ELISA) is typically performed to detect the presence and/or amount of a target protein of interest within an experimental sample. Detection of the target protein is made possible by antibodies, which make the ELISA an immunoassay. Through a series of incubation and washing steps, these antibodies, which are frequently linked, or conjugated, to an enzyme, will detect protein coating the bottom of a well on a microtiter plate. When exposed to a substrate,...
05:42
Using a Sandwich ELISA to Determine the Immunogenic Glycoprotein Content in a Vaccine
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2025
This video showcases an indirect enzyme-linked immunosorbent assay or ELISA sandwich immunocapture assay designed to assess immunogenic glycoprotein levels in vaccines. The assay plate, containing glycoprotein-specific antibodies, is incubated with serially diluted vaccine samples, including reference and test vaccines, followed by immunoassay to quantify glycoprotein content in the test vaccine.
06:50
Sandwich-like Microenvironments to Harness Cell/Material Interactions
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Cited by 3 •
2015
The following protocol describes the procedure to assemble sandwich-like cultures to be used as an intermediate stage between bi-dimensional (2D) and three-dimensional (3D) cellular environments. The engineered systems can have applications in microscopy, biomechanics, biochemistry and cell biology assays.
07:18
Quantifying Myeloperoxidase-DNA and Neutrophil Elastase-DNA Complexes from Neutrophil Extracellular Traps by Using a Modified Sandwich ELISA
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Cited by 12 •
2023
We present a protocol for a modified sandwich enzyme-linked immunosorbent assay technique to quantitatively measure two components of neutrophil extracellular trap remnants, myeloperoxidase conjugated-DNA and neutrophil elastase conjugated-DNA complexes,derived from activated neutrophils.
FAQs
Reliable signal generation depends on two antibodies recognizing separate epitopes, or distinct regions, of the same antigen. The capture antibody retains the target on the assay surface, while the detection antibody binds another site without displacing it. This paired-recognition arrangement helps distinguish the target from other components in a biological sample and supports selective measurement.
The enzyme label does not measure the antigen directly; it converts an added substrate into a colored product. Because the resulting color is proportional to the antigen concentration, the signal provides a quantitative readout rather than only a positive or negative result. This relationship allows researchers to compare samples and estimate the amount of target present.
Standards are essential for turning the observed color into an antigen concentration. Researchers compare the signal from an unknown sample with signals generated by samples of known concentration, establishing the basis for quantification. Without this comparison, the assay can indicate relative signal strength, but it cannot provide the concentration estimate needed to quantify the target.
A typical workflow begins with an immobilized capture antibody, followed by exposure to the biological sample so the target can bind. A second antibody is then added to recognize the captured antigen, and the enzyme-associated detection system is followed by substrate addition. The resulting color is measured and compared with standards to quantify unknown samples.
Sample choice depends on the biological question and the target being measured. Sandwich ELISA can be applied to serum, cell culture media, and other complex biological samples, enabling analysis of cytokines, hormones, proteins, and disease biomarkers. These sample and target combinations allow investigators to quantify biologically relevant molecules in research settings and compare levels among unknown samples.
Its value in biology comes from linking molecular recognition to measurable sample data. Measurements of cytokines or hormones can help examine biological responses, while protein and disease-biomarker measurements support research and diagnostic contexts. Because unknown samples are interpreted against standards, the assay produces concentration-oriented results that can be compared across the samples included in a study.