Overview
Epitestosterone (异雄酮) is a naturally occurring steroid hormone and the 17α-epimer of testosterone. Unlike testosterone, it exhibits minimal androgenic activity, making it biologically inactive in most contexts. It is primarily used in scientific research, particularly in studies related to doping detection in sports, as epitestosterone levels are monitored alongside testosterone to identify performance-enhancing drug use. Epitestosterone is also employed in hormone therapy and medical diagnostics. Its structural similarity to testosterone allows it to serve as a reference compound in analytical chemistry. The compound is synthesized for laboratory use and is available in high-purity forms for research and industrial applications.
Physical and Chemical Properties
Epitestosterone is a white to off-white crystalline powder with a molecular weight of 288.42 g/mol. It has a melting point of approximately 155-157°C and is soluble in organic solvents like ethanol and methanol but only slightly soluble in water. Its stability under recommended storage conditions (2-8°C, protected from light) ensures long-term usability. The compound's chemical structure features a 17α-hydroxy group, distinguishing it from testosterone's 17β configuration. This minor structural difference renders epitestosterone biologically inactive while retaining its utility in analytical and diagnostic applications. Its stability and solubility profile make it suitable for laboratory use in various solvents and buffers.
Main Applications
Epitestosterone is primarily used in doping control programs, where it serves as a biomarker to detect testosterone abuse in athletes. The World Anti-Doping Agency (WADA) monitors the testosterone-to-epitestosterone (T/E) ratio, with abnormal levels indicating potential doping. In medical research, epitestosterone is studied for its role in endocrine function and its potential therapeutic applications. It is also used as a reference standard in chromatographic analyses to quantify testosterone and related steroids. Additionally, pharmaceutical companies utilize epitestosterone in the development of hormone therapies and diagnostic kits.
Safety and Storage
Epitestosterone should be handled with appropriate personal protective equipment, including gloves and lab coats, to avoid skin contact or inhalation. While it is not highly toxic, prolonged exposure may cause irritation or allergic reactions. Storage conditions are critical to maintaining the compound's stability. It should be kept in a tightly sealed container at 2-8°C, protected from light and moisture. Bulk quantities require climate-controlled environments to prevent degradation. Disposal should comply with local regulations for steroid compounds.
B2B Procurement Guide
When procuring epitestosterone, buyers should prioritize suppliers with certified analytical reports (e.g., HPLC purity ≥98%) and valid CAS number verification. Reputable suppliers often provide batch-specific certificates of analysis (CoA) to ensure quality. Due to its regulatory status in sports and medicine, buyers must confirm compliance with international trade laws, including import/export restrictions. Bulk purchases typically offer cost savings, but storage capacity and shelf-life considerations should be evaluated. Lead times may vary depending on supplier stock and synthesis schedules.
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