Esterified Estrogens are a pharmaceutical preparation containing a mixture of esterified estrogen compounds. They are used as an estrogenic active pharmaceutical ingredient in hormone-related pharmaceutical formulations, particularly for the management of symptoms associated with estrogen deficiency.
Esterified Estrogens are different from Conjugated Estrogens. Esterified Estrogens generally consist primarily of estrone sulfate and/or equilin sulfate esters, depending on the applicable pharmaceutical specification and source.
Esterified Estrogens are a mixture of estrogenic substances in esterified form. Because the product is a mixture rather than one single chemical compound, it does not have one universal molecular formula or molecular weight applicable to the complete preparation.
CAS Number: 6898-97-1
Category: Estrogenic Hormonal API
Therapeutic Area: Women's Health / Endocrinology
Esterified Estrogens exert their effects primarily through estrogen receptor activation. The estrogenic components interact with estrogen receptors and influence the transcription of estrogen-responsive genes.
Their pharmacological effects may include:
Esterified Estrogens are used in pharmaceutical formulations for:
The exact therapeutic use depends on the final pharmaceutical formulation and applicable regulatory labeling.
Esterified Estrogens are a mixture-based estrogenic API rather than a single molecular entity. Therefore, the composition, estrogenic potency and component profile are important quality attributes.
Typical quality evaluation may include:
Pharmaceutical-grade Esterified Estrogens should comply with the applicable pharmacopoeial monograph, approved specification and regulatory requirements.
Because this is a mixture, the exact composition and acceptance criteria should be taken from the applicable approved specification rather than using specifications for a single estrogen such as estradiol or estrone.
A qualified supplier should provide Certificate of Analysis (CoA), specification sheet, SDS/MSDS, batch traceability and applicable regulatory documentation.
Store Esterified Estrogens in a tightly closed container, protected from excessive moisture, heat and direct light, according to the manufacturer's approved storage and stability requirements.
| Parameter | Specification |
|---|---|
| Appearance | White to off-white crystalline powder |
| Identification | IR & HPLC compliant |
| Assay (HPLC) | NLT 98.0% by HPLC |
| Loss on Drying | NMT 1.0% |
| Residue on Ignition | NMT 0.5% |
| pH (1% Solution) | 2.0 – 4.0 |
| Total Impurities | NMT 1.0% |