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Related Experiment Videos

Polymorphism of rifampicin

G Pelizza, M Nebuloni, P Ferrari

    Il Farmaco; Edizione Scientifica
    |July 1, 1977
    PubMed
    Summary
    This summary is machine-generated.

    Rifampicin exhibits polymorphism, with multiple crystalline, amorphous, and solvate forms identified. Characterization revealed specific intramolecular hydrogen bonds influencing its structural features and stability.

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    Area of Science:

    • Pharmaceutical Sciences
    • Solid-State Chemistry
    • Drug Polymorphism

    Background:

    • Rifampicin, a vital antibiotic, is known to exhibit polymorphism.
    • Understanding different solid-state forms is crucial for drug formulation and efficacy.

    Purpose of the Study:

    • To isolate and characterize various polymorphic and solvate forms of rifampicin.
    • To investigate the structural features contributing to rifampicin's polymorphism.
    • To report the relative physical stabilities of the identified rifampicin forms.

    Main Methods:

    • Isolation of crystalline, amorphous, and solvate forms of rifampicin.
    • Characterization using thermal analysis, infrared (I.R.) spectroscopy, and X-ray powder spectroscopy.
    • Interpretation of I.R. spectral data to identify structural features like intramolecular hydrogen bonds.

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    Main Results:

    • Two crystalline forms, one amorphous form, and four solvates (S I-IV) of rifampicin were successfully isolated.
    • Infrared spectroscopy indicated specific intramolecular hydrogen bonds (e.g., C23--OH and O=C--O--C25) linked to polymorphism.
    • Relative physical stabilities of the different rifampicin forms were determined.

    Conclusions:

    • Rifampicin demonstrates significant polymorphism, impacting its solid-state properties.
    • Intramolecular hydrogen bonding plays a key role in defining the structural characteristics of rifampicin's various forms.
    • The study provides essential data on the stability of different rifampicin forms, relevant for pharmaceutical development.