Elisa Normalization
Elisa Normalization - Related Videos
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,...
14:22
ELISA Assays: Indirect, Sandwich, and Competitive
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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...
03:55
ELISA-Based Method to Analyze Interactions between Bait and Prey Proteins
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2025
This video describes an ELISA-based technique that detects protein-protein interactions between two proteins by measuring the binding of the second protein to the immobilized first protein. The bound second protein is detected using specific antibodies labeled with an enzyme, such as horseradish peroxidase.
03:35
ELISA-Based Reporter Assay to Study the Receptor-Ligand Interaction in BW Cells
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2025
This video demonstrates the reporter assay-based detection of the receptor-ligand interaction. The successful receptor-ligand interaction activates the downstream signaling pathway, causing the generation and release of cytokines as secretory reporter molecules in the solution, which is confirmed using ELISA.
12:38
Titration ELISA as a Method to Determine the Dissociation Constant of Receptor Ligand Interaction
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Cited by 29 •
2018
A detailed protocol to perform a titration ELISA is described. Moreover, a novel algorithm is presented to evaluate titration ELISAs and to obtain a dissociation constant of binding of a soluble ligand to a microtiter plate-immobilized receptor.
FAQs
A standard curve provides a reference for relating the measured ELISA signal to comparable target concentrations. Instead of interpreting raw colorimetric or chemiluminescent intensity alone, researchers use the curve to express results on a common concentration scale. This makes measurements from different samples, plates, or experiments easier to compare when assay conditions or sample input vary.
Normalization can reduce differences linked to the amount of sample added, assay conditions, and technical handling. These factors may change the measured signal even when the underlying target differs less substantially. Adjusting results with a standard curve, reference control, or related measurement helps separate biologically meaningful variation from variation introduced during assay performance.
These approaches provide different comparison bases. A standard curve expresses the target signal as a concentration, a reference control anchors results to a shared assay value, and total protein provides a related measurement for adjustment. The appropriate choice depends on what information is available and whether the goal is concentration reporting, control-based comparison, or accounting for sample input.
Normalization should make results more comparable without replacing the antibody-antigen interaction that identifies the target. The assay still generates its measured colorimetric or chemiluminescent readout through that detection principle, while normalization adjusts how the signal is reported or compared. Preserving this relationship keeps the normalized value connected to the measured immune or pathogen-associated marker.
A basic workflow begins with measuring the target signal, then selecting a suitable comparison basis such as a standard curve, reference control, or total protein measurement. Results are converted or adjusted using that basis and then compared across samples, plates, or experiments. The final values should remain linked to the target being measured and the chosen normalization reference.
Normalization is useful when researchers compare cytokines, antibodies, microbial antigens, or other immune and pathogen-associated markers across samples or experimental runs. It supports more reliable evaluation of infection severity, immune responses, and treatment effects by reducing variation unrelated to the biological question. This is particularly valuable when results must be interpreted across multiple plates or experiments.