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Related Experiment Videos

Photolytic decomposition of indapamide.

R Davis, C H Wells, A R Taylor

    Journal of Pharmaceutical Sciences
    |August 1, 1979
    PubMed
    Summary
    This summary is machine-generated.

    Photolytic decomposition of indapamide in nitrogen or oxygen environments yields various chemical compounds. This study compares these photolytic pathways with the thermal decomposition of indapamide.

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    Area of Science:

    • Photochemistry
    • Organic Chemistry
    • Pharmaceutical Analysis

    Background:

    • Indapamide is a diuretic drug.
    • Understanding its degradation pathways is crucial for stability studies.
    • Photolytic and thermal degradation can occur during storage and handling.

    Purpose of the Study:

    • To investigate the photolytic decomposition products of indapamide in methanol under different atmospheric conditions (nitrogen vs. oxygen).
    • To compare the photolytic degradation pathways with the thermal decomposition of indapamide.

    Main Methods:

    • Photolysis of indapamide in nitrogen-flushed methanol.
    • Photolysis of indapamide in oxygen-flushed methanol.
    • Analysis of decomposition products using analytical techniques (implied).

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  • Comparison with thermal decomposition data.

    • Main Results:

    • Under nitrogen, photolysis yielded 3-sulfamoyl-4-chlorobenzamide, 2-methylindoline, semicarbazide, and 1-(N-formamido)-2-methylindoline.
    • Under oxygen, additional products included 1-aminocarboxymethyl-2-methylindoline, 3-sulfamoyl-4-chlorobenzoic acid, methyl-3-sulfamoyl-4-chlorobenzoate, and 2-(N-acetamido)-benzoic acid.
    • Distinct product profiles were observed between nitrogen and oxygen conditions.

    Conclusions:

    • The presence of oxygen significantly alters the photolytic decomposition pathway of indapamide.
    • The identified products provide insight into the photodegradation mechanisms of indapamide.
    • Comparative analysis with thermal decomposition aids in understanding overall drug stability.