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Identification and Structural Elucidation of New Process Impurity in Testosterone.

Vandana Gupte1, Umesh Luthra1, Neetin Desai2

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This study identified and characterized a new impurity in testosterone using high-performance liquid chromatography (HPLC). The impurity, bisnoralcohol, was isolated and confirmed using advanced spectroscopic techniques, meeting ICH guidelines.

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Area of Science:

  • Pharmaceutical Chemistry
  • Analytical Chemistry
  • Organic Chemistry

Background:

  • Testosterone is a crucial hormone with various pharmaceutical applications.
  • Ensuring the purity of pharmaceutical compounds like testosterone is vital for patient safety and drug efficacy.
  • Pharmacopeial methods are essential for controlling the quality of active pharmaceutical ingredients.

Purpose of the Study:

  • To identify, isolate, and characterize a potential unknown impurity in testosterone.
  • To ensure testosterone quality meets stringent European pharmacopeial standards.
  • To elucidate the structure of a novel impurity exceeding 0.10%.

Main Methods:

  • Analysis of testosterone using European pharmacopeial methods for related substances via high-performance liquid chromatography (HPLC).
  • Isolation of the unknown impurity utilizing preparative HPLC with a Symmetry C18 column.
  • Characterization of the isolated impurity through Liquid Chromatography-Mass Spectrometry/Mass Spectrometry (LC-MS/MS), Proton Nuclear Magnetic Resonance (1H NMR), Carbon-13 Nuclear Magnetic Resonance (13C NMR), and Distortionless Enhancement by Polarization Transfer (DEPT) spectroscopy.

Main Results:

  • One new unknown impurity was detected in testosterone alongside existing pharmacopeial impurities.
  • The unknown impurity was successfully isolated using preparative HPLC.
  • Spectroscopic analysis confirmed the impurity's structure as bisnoralcohol, adhering to International Council for Harmonisation (ICH) guidelines.

Conclusions:

  • The study successfully identified and characterized a previously unknown impurity in testosterone as bisnoralcohol.
  • The findings contribute to the quality control and safety assessment of testosterone drug products.
  • This detailed characterization supports regulatory compliance and pharmaceutical manufacturing standards.