Description

D3-Epitestosterone is a deuterium-labeled analog of the endogenous steroid hormone epitestosterone, specifically designed for analytical and research applications. This stable isotope-labeled compound is essential for use as an internal standard in mass spectrometry, ensuring accurate quantification and reliable results in complex biological matrices. It is a critical tool for researchers and laboratories in the fields of clinical diagnostics, anti-doping analysis, endocrinology, and pharmaceutical development who require the highest standards of precision and traceability.

Application

• Internal Standard for LC-MS/MS: Primary application as a quantitative reference standard in liquid chromatography-tandem mass spectrometry for the analysis of epitestosterone and related steroids.
• Anti-Doping Analysis: Used by World Anti-Doping Agency (WADA)-accredited laboratories for precise measurement of the Testosterone/Epitestosterone (T/E) ratio in athlete samples.
• Clinical Research & Diagnostics: Enables accurate profiling of steroid hormones in serum, urine, and other biological fluids for endocrine disorder studies.
• Pharmaceutical R&D: Supports drug metabolism and pharmacokinetics (DMPK) studies for steroid-based therapeutics.
• Forensic Toxicology: Aids in the definitive identification and quantification of steroids in forensic casework.
• Method Development & Validation: Critical for developing, calibrating, and validating new analytical methods in bioanalytical chemistry.
• Quality Control Reference Material: Serves as a certified reference material (CRM) for ensuring the accuracy and precision of in-house laboratory QC protocols.

Basic Information

Product Name	D3-Epitestosterone
CAS No.	354819-88-8
Molecular Formula	C19H25D3O2
Molecular Weight	291.45 g/mol
Synonyms	17α-Hydroxyandrost-4-en-3-one-d3; [16,16,17-d3]-Epitestosterone; Deuterated Epitestosterone; Epitestosterone-d3; 17α-Testosterone-d3; Androst-4-en-17α-ol-3-one-d3; Isotopically Labeled Epitestosterone
EINECS	Contact for details

Quality Control

Our D3-Epitestosterone is manufactured under strict quality systems to ensure the high chemical and isotopic purity required for sensitive analytical applications. Each batch is characterized by advanced spectroscopic and chromatographic techniques, including NMR, HPLC, and mass spectrometry, to confirm identity, purity, and isotopic enrichment. A comprehensive Certificate of Analysis (COA) is provided, detailing batch-specific results for all critical parameters. We support compliance with ISO 17025, GMP for Active Pharmaceutical Ingredients (APIs), and relevant pharmacopeial guidelines where applicable.

Storage

Preserve in a tightly closed container, protected from light. Store at controlled room temperature (15-25°C) or as indicated on the label or COA. This product is hygroscopic (moisture-sensitive) and should be handled in a dry environment to maintain stability. For long-term storage, consider storing under an inert atmosphere.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Identification (MS)	Conforms to structure
Purity (HPLC)	≥ 98.0%
Isotopic Purity (MS)	≥ 98.0 atom % D
Chemical Purity (NMR)	Conforms
Water Content (KF)	≤ 0.5%
Residue on Ignition	≤ 0.1%

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.