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Specifications
| Grade | USP36 |
| Characteristics | White to creamy white, odorless, crystalline powder |
| Content | 97.0 ~ 102.0% |
| TLC | Positive |
| UV spectrum | Positive |
| IR spectrum | Positive |
| Solubility | Soluble in alcohol, chloroform, ether, vegetable oils, and solutions of fixed alkali hydroxides; insoluble in water |
| Completeness of solution | Dissolve 100 mg in 5 mL of alcohol; the solution is clear and free from undissolved solid |
| Melting point | 180–186 °C |
| Specific optical rotation | -28° ~ -29.5° |
| Loss on drying | 1.0% max |
| Residual solvents – Acetone | ≤5000 ppm |
Applications
Ethynyl estradiol is a synthetic estrogen widely used in pharmaceutical and clinical applications, primarily in hormonal therapies. It is a key active ingredient in combined oral contraceptives, hormone replacement therapy (HRT), and treatments for menstrual disorders, endometriosis, and estrogen deficiency. In pharmaceutical research, ethynyl estradiol is employed as a reference compound to study estrogen receptor binding, metabolism, and pharmacokinetics. It is also used in the development of novel estrogenic or selective estrogen receptor modulator (SERM) derivatives for therapeutic purposes. Additionally, the compound finds applications in endocrinology research to investigate hormonal regulation, reproductive biology, and the effects of estrogens on various physiological systems.
Benefits
Ethynyl estradiol offers several advantages due to its high oral bioavailability, metabolic stability, and potent estrogenic activity. The ethynyl group at the C17 position enhances resistance to hepatic metabolism, allowing effective systemic exposure through oral administration. This property enables precise dosing, consistent efficacy, and prolonged therapeutic effects. It provides reliable regulation of the menstrual cycle, effective contraception, and alleviation of estrogen deficiency symptoms with a well-characterized safety profile. In research applications, its predictable receptor-binding properties and chemical stability make it a dependable standard for studying estrogenic activity and developing new therapies.
Conclusion
Ethynyl estradiol is a highly important synthetic estrogen with broad applications in contraception, hormone therapy, and pharmaceutical research. Its benefits, including potent activity, oral bioavailability, metabolic stability, and reliability in estrogen receptor studies, make it an essential compound in both clinical and research settings. The compound continues to support advancements in reproductive health, endocrine therapies, and the development of novel estrogen-related treatments.
