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Related Experiment Videos

Impurity profile study of repaglinide.

K V S R Krishna Reddy1, J Moses Babu, Vijayavitthal T Mathad

  • 1Department of Analytical Research, Discover Research, Dr. Reddy's Laboratories Ltd., Bollaram Road, Miyapur, Hyderabad 500 050, India.

Journal of Pharmaceutical and Biomedical Analysis
|October 21, 2003
PubMed
Summary
This summary is machine-generated.

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A simple high-performance liquid chromatography (HPLC) method detected unknown impurities in repaglinide bulk drug. The study identified and characterized three impurities and one byproduct using spectroscopic data and preparative HPLC.

Area of Science:

  • Pharmaceutical Chemistry
  • Analytical Chemistry

Background:

  • Repaglinide is an important antidiabetic drug.
  • Ensuring the purity of bulk drug substances is critical for pharmaceutical safety and efficacy.
  • Detection and characterization of impurities are essential regulatory requirements.

Purpose of the Study:

  • To develop a simple analytical method for detecting impurities in repaglinide bulk drug.
  • To isolate and characterize unknown impurities and byproducts present in repaglinide.
  • To elucidate the structures and discuss the formation pathways of these compounds.

Main Methods:

  • Simple isocratic reversed-phase high performance liquid chromatography (HPLC) for detection.
  • Reversed-phase preparative HPLC for isolation of impurities.

Related Experiment Videos

  • Spectroscopic techniques including Infrared (IR), Nuclear Magnetic Resonance (NMR), and Mass Spectrometry (MS) for structural characterization.

    • Main Results:

    • Three unknown impurities and one byproduct were detected at levels below 0.1% in repaglinide bulk drug.
    • The structures were characterized as 4-carboxymethyl-2-ethoxy-benzoic acid (Impurity I), 4-cyclohexylaminocarbamoylmethyl-2-ethoxy-benzoic acid (Impurity II), 1,3-dicyclohexyl urea (Byproduct III), and 1-cyclohexyl-3-[3-methyl-1-(2-piperidin-1-yl-phenyl)-butyl]-urea (Impurity IV).
    • The synthesis and formation of these identified compounds were discussed.

    Conclusions:

    • A sensitive and straightforward HPLC method was established for repaglinide impurity profiling.
    • The structural elucidation of key impurities and a byproduct provides valuable information for quality control.
    • Understanding impurity formation is crucial for optimizing the synthesis and purification of repaglinide.