Estriol (E3)-6-HRP Antigen

A liquid-phase antigen-HRP conjugate supplied as a 1ml ready-to-use reagent for immunoassay development, this Antibodies.com product couples horseradish peroxidase through the C6 position of the estriol steroid scaffold. The labeling strategy leaves the C3, C16α, and C17α hydroxyl groups of estriol free to interact with capture antibodies in competitive ELISA workflows, supporting quantitative measurement of estriol — the dominant estrogen of late pregnancy produced by the fetoplacental unit — in clinical and reproductive research.

Typical uses include construction of direct competitive immunoassays for late-pregnancy estriol monitoring, third-trimester fetal well-being studies, and assay development aimed at distinguishing estrone, estradiol, and estriol, three estrogens that share a common steroid backbone but differ in their hydroxylation pattern. The liquid format allows the conjugate to be diluted directly into assay buffer without prior reconstitution.