Glossary

Blocking Agent

Laboratory

Blocking Agent — A protein or chemical used to occupy non-specific binding sites on assay surfaces, preventing false positives in peptide immunoassays (e.g., BSA, casein).

What Is a Blocking Agent?

A blocking agent is a protein or chemical used to saturate non-specific binding sites on assay surfaces (membranes, plates, beads) to prevent false-positive signals from non-specific adsorption. Proper blocking is essential for accurate results in ELISA, Western blot, and immunohistochemistry involving peptide antigens.

Common Blocking Agents

BSA (1-5%): General-purpose blocker. Do not use when BSA is the target or when using anti-BSA antibodies
Non-fat dry milk (5%): Inexpensive, effective. Contains biotin and phosphoproteins (avoid for streptavidin or phospho-detection)
Casein: Low background for chemiluminescent detection

Frequently Asked Questions

What is Blocking Agent?

A protein or chemical used to occupy non-specific binding sites on assay surfaces, preventing false positives in peptide immunoassays (e.g., BSA, casein).

Why is Blocking Agent important in peptide research?

Blocking Agent is a fundamental concept in laboratory 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.

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