What is the antihuman globulin conjugated with in ELISA?

In an ELISA (Enzyme-Linked Immunosorbent Assay), antihuman globulin can be conjugated with various substances that serve as indicators, with horseradish peroxidase (HRP) being one of the most commonly used enzymes. When HRP is conjugated with antihuman globulin, it allows for the amplification of the signal during the assay by catalyzing a reaction with a substrate that produces a measurable color change. This enzyme's activity makes it particularly useful in detecting immune complexes, enhancing the assay's sensitivity.

The choice of horseradish peroxidase is popular because it is stable, has a wide range of substrates, and provides a strong signal that can easily be detected through colorimetric, fluorometric, or chemiluminescent methods. This specificity in using HRP contributes significantly to the effectiveness of the ELISA in quantifying various analytes, including antibodies.

While alkaline phosphatase, biotin, and fluorescein are also used in immunological assays, they serve different roles or are utilized in various assay configurations. Alkaline phosphatase, like HRP, can also be used as a conjugate; however, in this specific context, the connection to HR