Paper-based Elisa
Paper-based Elisa - Related Videos
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The ELISA Method
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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,...
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A Paper-Based Immunoassay for the Detection of Immunoglobulin G
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ELISA-Based Method to Analyze Interactions between Bait and Prey Proteins
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ELISA-Based Reporter Assay to Study the Receptor-Ligand Interaction in BW Cells
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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.
FAQs
These antibodies provide two linked recognition steps. The immobilized capture antibody retains the target antigen as the sample moves through the paper, and the enzyme-linked detection antibody binds the captured target to form the immune complex. This arrangement connects selective biomolecule recognition with a downstream color-producing reaction, helping distinguish target detection from simple sample movement.
After the detection antibody has bound, adding its substrate allows the attached enzyme to generate a colored signal. The visible reaction supplies the assay readout rather than relying only on whether liquid traveled through the paper. Depending on how the test is designed and interpreted, that signal can support either a qualitative result or quantitative biochemical analysis.
Paper provides a porous pathway through which the liquid sample wicks, bringing dissolved assay components into contact with immobilized antibodies. This passive movement helps miniaturize the workflow and permits analysis with small sample volumes. Because the paper serves as both the reaction substrate and a transport medium, the format supports portable and economical biochemical testing.
The principal distinction is the physical format rather than the antibody-based detection logic. Paper-based ELISA places the reaction on a porous paper substrate, reducing the scale of the assay and supporting portability, economical analysis, and small-volume testing. These features are especially relevant when standard laboratory infrastructure is limited, while immune-complex and enzyme-signal principles remain central.
A typical sequence begins by allowing the liquid sample to wick across paper containing immobilized capture antibodies. Any target antigen in the sample binds those antibodies, after which an enzyme-linked detection antibody forms the immune complex. Addition of the enzyme substrate then produces the colored readout. This sequence connects sample introduction, molecular capture, labeled detection, and signal generation.
The core components are a porous paper substrate, immobilized capture antibodies, the sample being tested, an enzyme-linked detection antibody, and the corresponding substrate for color development. Together, these materials provide transport, target capture, labeled recognition, and signal generation. Their integration on paper enables the assay to use small sample volumes and support portable biochemical analysis.
It is useful when biomolecule detection must move beyond a fully equipped laboratory. The format is suited to field diagnostics, environmental screening, and research performed in resource-limited settings. Its portability, economical design, and low sample-volume requirement can make antibody-based analysis more accessible while preserving a biochemical readout based on antigen recognition and enzyme activity.
The assay can provide a qualitative indication of whether the target-associated signal is present and can also support quantitative testing when the colored response is interpreted analytically. This flexibility makes the same general platform relevant to screening and measurement. In biochemistry, the result reflects the linked sequence of antigen capture, detection-antibody binding, and enzyme-mediated color production.