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Related Experiment Videos

[Antimicrobial conservation of some cosmetics]

Z Muszyński1, J Długaszewska

  • 1Katedra i Zakład Bakteriologii Farmaceutycznej AM w Poznaniu.

Medycyna Doswiadczalna I Mikrobiologia
|January 1, 1994
PubMed
Summary
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This study evaluated biocides for cosmetic preservation. Gropol, Bronopol, and Kathon CG were effective for water-in-oil creams, while Sepicide Cl proved optimal for toothpastes.

Area of Science:

  • Cosmetic Science
  • Microbiology
  • Preservative Efficacy Testing

Background:

  • Cosmetics require effective preservation against microbial contamination.
  • Understanding biocide efficacy in different cosmetic formulations is crucial for product safety and shelf-life.
  • Standardized testing methods are essential for evaluating preservative systems.

Purpose of the Study:

  • To assess the efficacy of various biocides in oil-in-water (O/W) and water-in-oil (W/O) emulsion creams and toothpastes.
  • To identify the most effective preservatives and their optimal concentrations for different cosmetic types.
  • To determine the resistance of specific cosmetic-isolated microorganisms to tested biocides.

Main Methods:

  • A 28-day "conservation test" was performed on model creams and commercial toothpastes.

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  • Microorganisms recommended by the National Institute of Hygiene and cosmetic-isolated strains were used.
  • Initial microbial contamination levels were standardized to 10(6) cells/g.
  • A range of biocides including Nipagin, Kathon CG, Sepicide Cl, Chlor-hexidine gluconate, Gropol, and Bronopol were tested.

    • Main Results:

    • For W/O emulsion creams, Gropol and Bronopol at 0.01% and Kathon CG at 0.05% demonstrated efficacy for 5 days.
    • Sepicide Cl at 0.3% was the optimal biocide for toothpastes, showing cidal activity within 4 days.
    • Pseudomonas aeruginosa and P. putida, isolated from cosmetic creams, exhibited the highest resistance to the tested biocides.

    Conclusions:

    • Specific biocides show differential efficacy depending on the cosmetic formulation type (W/O cream vs. toothpaste).
    • Gropol, Bronopol, and Kathon CG are recommended for W/O cream preservation, while Sepicide Cl is suitable for toothpaste.
    • Further investigation into the resistance mechanisms of Pseudomonas species in cosmetic environments is warranted.