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Contaminants in commercial dapsone

A P Cheung, P Lim

    Journal of Pharmaceutical Sciences
    |December 1, 1977
    PubMed
    Summary
    This summary is machine-generated.

    Three common dapsone contaminants were identified using spectral analysis and synthesis. Pure dapsone was successfully prepared through solvent-free recrystallization from chloroform, ensuring higher quality pharmaceutical compounds.

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    Area of Science:

    • Pharmaceutical Chemistry
    • Analytical Chemistry
    • Organic Synthesis

    Background:

    • Commercial dapsone preparations often contain impurities that can affect drug efficacy and safety.
    • Identifying and characterizing these contaminants is crucial for quality control in pharmaceutical manufacturing.

    Purpose of the Study:

    • To identify and confirm the structures of three common contaminants in commercial dapsone.
    • To develop a method for preparing pure dapsone free from these identified impurities.

    Main Methods:

    • Spectral analysis techniques (e.g., NMR, Mass Spectrometry) were employed to elucidate the structures of the contaminants.
    • Unambiguous synthesis of each identified contaminant was performed to confirm their structures.
    • Solvent-free recrystallization from chloroform was utilized to purify dapsone.

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    Main Results:

    • The three primary contaminants in commercial dapsone were identified as 2,4'-sulfonylbis(benzeneamine), 4-(phenylsulfonyl)benzeneamine, and 4-(4'-chlorophenylsulfonyl)benzeneamine.
    • The spectral data and synthetic routes unequivocally confirmed the identity of each contaminant.
    • A solvent-free recrystallization method using chloroform yielded highly pure dapsone.

    Conclusions:

    • The study successfully identified key impurities in commercial dapsone, providing critical information for manufacturers.
    • The development of a solvent-free purification method offers a more efficient and potentially greener approach to obtaining pure dapsone.
    • These findings contribute to improving the quality and safety of dapsone-based pharmaceuticals.