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Related Experiment Videos

Stability-indicating assay for vidarabine.

W H Hong, D H Szulczewski

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

    A new method analyzes vidarabine (a drug) in injectable solutions, ensuring its strength and stability. It identifies decomposition into adenine and arabinose, crucial for quality control.

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    Area of Science:

    • Analytical Chemistry
    • Pharmaceutical Sciences
    • Drug Stability

    Background:

    • Vidarabine (ara-A) is an antiviral drug administered via parenteral formulations.
    • Ensuring the potency and stability of vidarabine in aqueous solutions is critical for patient safety and therapeutic efficacy.
    • A validated analytical method is required to quantify intact vidarabine and monitor its degradation.

    Purpose of the Study:

    • To develop and validate a physicochemical method for analyzing vidarabine in aqueous parenteral formulations.
    • To identify the decomposition products and degradation pathway of vidarabine in aqueous solution.
    • To establish a reliable method for quality control of vidarabine formulations.

    Main Methods:

    • Development of a quantitative physicochemical procedure for vidarabine analysis.

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  • Spectroscopic (UV, polarimetric) and Thin-Layer Chromatography (TLC) for product identification.
  • Ion-exchange chromatography for separating vidarabine from its decomposition products.
  • Validation of the analytical method using microbial assays.

    • Main Results:

    • A quantitative method was successfully developed to determine intact vidarabine in the presence of degradation products.
    • Hydrolysis in aqueous solution was identified as the primary degradation route, yielding adenine and arabinose without racemization.
    • Ion-exchange separation significantly enhanced the method's sensitivity to drug decomposition.
    • Comparable results were obtained when analyzing partially decomposed solutions using both ion-exchange and microbiological methods.

    Conclusions:

    • The developed ion-exchange-UV method is suitable for analyzing vidarabine potency and stability in parenteral formulations.
    • Understanding the hydrolysis pathway is essential for predicting and controlling vidarabine degradation.
    • The validated method provides a reliable tool for pharmaceutical quality control of vidarabine products.