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Related Experiment Videos

Preservative activity in diluted corticosteroid creams.

W B Hugo, S P Denyer, H L York

    The Journal of Hospital Infection
    |September 1, 1984
    PubMed
    Summary

    Betnovate and Synalar creams, when diluted with Unguentum Merck, effectively preserved against common bacteria like E. coli, S. aureus, and P. aeruginosa. No viable bacteria were detected after seven days, indicating good preservative efficacy.

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    Area of Science:

    • Pharmaceutical Microbiology
    • Dermatology
    • Formulation Science

    Background:

    • Topical corticosteroid creams like Betnovate and Synalar are widely used.
    • Preservative efficacy is crucial for maintaining the microbial quality of pharmaceutical formulations.
    • Dilution with a base cream like Unguentum Merck is a common practice.

    Purpose of the Study:

    • To evaluate the preservative efficacy of Betnovate and Synalar creams diluted with Unguentum Merck.
    • To determine the effectiveness of these diluted formulations against specific bacterial challenges.

    Main Methods:

    • Formulations of Betnovate and Synalar creams diluted 1:1 with Unguentum Merck were prepared.
    • Each formulation was challenged with Escherichia coli, Staphylococcus aureus, and Pseudomonas aeruginosa.

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  • Initial bacterial inoculum was approximately 1 x 10(6) viable organisms per gram.

    • Main Results:

    • All tested formulations demonstrated effective preservation.
    • No viable bacteria were detected in any of the formulations seven days post-inoculation.
    • The dilutions maintained their integrity against the tested microbial contaminants.

    Conclusions:

    • Diluted Betnovate and Synalar creams exhibit adequate preservative properties.
    • The addition of Unguentum Merck does not compromise the antimicrobial protection of these corticosteroid creams.
    • These findings support the continued use of these diluted formulations in clinical practice.