Definition

Noun: - An enzyme used in immunohistochemistry to label antigens and their antibodies: Horseradish peroxidase is a specific enzyme, derived from the horseradish plant, that catalyzes a reaction to produce a detectable signal. It is commonly used as a tagging molecule in scientific techniques to visualize and locate specific proteins or other antigens in biological samples.

Usage Examples

• Noun:
  • The antibody was conjugated to horseradish peroxidase for detection. (The antibody was chemically attached to the enzyme so it could be seen.)
  • Horseradish peroxidase is a common label in Western blotting. (This enzyme is frequently used as a marker in this laboratory technique.)

Advanced Usage

• As a critical reagent: The term is used to refer to the purified enzyme itself as a key component in assay kits and staining procedures.
  • The sensitivity of the assay depends on the activity of the horseradish peroxidase.

Variants and Related Words

• HRP: A common abbreviation for horseradish peroxidase.
  • The protocol calls for an HRP-conjugated secondary antibody.
• Peroxidase: The general class of enzymes to which horseradish peroxidase belongs.
  • Other peroxidases may be used for similar applications.

Synonyms

• Enzyme label: A general term for an enzyme used as a detection tag.
• Immunohistochemical enzyme: An enzyme used specifically in immunohistochemistry.

Related Phrases

• HRP substrate: The chemical compound that the horseradish peroxidase enzyme acts upon to produce a colored or luminescent signal.
  • After adding the HRP substrate, a blue color developed.
• HRP-conjugated antibody: An antibody that has the horseradish peroxidase enzyme attached to it.
  • We used an HRP-conjugated antibody to identify the protein.

Noun

1. an enzyme used in immunohistochemistry to label antigens and their antibodies