ELISA (Enzyme-Linked Immunosorbent Assay)
ELISA (Enzyme-Linked Immunosorbent Assay) — A plate-based assay technique for detecting and quantifying peptides, proteins, and antibodies using enzyme-linked antibody reactions.
What Is ELISA?
Enzyme-linked immunosorbent assay (ELISA) is the gold standard method for quantifying specific peptides in biological samples (plasma, serum, cell culture supernatant). It uses antibody-antigen recognition for capture and detection, with an enzyme-substrate reaction generating a colorimetric signal proportional to peptide concentration. ELISA achieves pg/mL to ng/mL sensitivity.
ELISA Formats
- Sandwich ELISA: Capture antibody + sample + detection antibody. Most specific and sensitive format. Requires two antibodies recognizing different epitopes
- Competitive ELISA: Sample peptide competes with labeled peptide for antibody binding. Used when only one antibody is available or for small peptides
- Direct ELISA: Peptide coated directly on plate. Simplest format but lowest specificity
Peptide Research Applications
Quantify endogenous peptide levels (ghrelin, insulin, CGRP), measure cytokine responses to peptide treatment, detect anti-drug antibodies, and validate biomarker changes in clinical samples.
Frequently Asked Questions
What is ELISA (Enzyme-Linked Immunosorbent Assay)?
A plate-based assay technique for detecting and quantifying peptides, proteins, and antibodies using enzyme-linked antibody reactions.
Why is ELISA (Enzyme-Linked Immunosorbent Assay) important in peptide research?
ELISA (Enzyme-Linked Immunosorbent Assay) is a fundamental concept in analytical as it relates to peptide science. It directly influences experimental design, compound characterization, and the reliability of research outcomes across biochemistry and molecular biology disciplines.
Authority Sources
- ELISA (Enzyme-Linked Immunosorbent Assay) on Wikipedia
- Search ELISA (Enzyme-Linked Immunosorbent Assay) on PubChem (NIH)
- Research articles on ScienceDirect