Journal
EUROPEAN JOURNAL OF PHARMACEUTICS AND BIOPHARMACEUTICS
Volume 131, Issue -, Pages 152-161Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ejpb.2018.08.007
Keywords
Equilibrium dialysis; Preservation; Microbiological stability; Phenoxyethanol; Emulsifier; Partition coefficient; Preservative efficacy testing
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Funding
- Almirall Hermal GmbH
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Antimicrobial testing is a time consuming and cost-intensive but essential method for evaluation of newly developed pharmaceutical formulations for topical use. In this study the correlation between free preservative concentration in emulsion gels measured by equilibrium dialysis and the successful preservative effectiveness testing for Pseudomonas aeruginosa, Staphylococcus aureus, Candida albicans and Aspergillus brasiliensis (analyzed according to Ph. Eur. and USP) was investigated. The higher the lipophilicity of the oil phase and the lower the content of the aqueous phase with regard to dissolved ingredients the more preferably distributed is phenoxyethanol to the water phase and, consequently, the higher was the efficacy against the microbes. Increased emulsifier concentrations reduced the free amount of the preservative due to micellar interactions. Aspergillus brasiliensis was the most resistant and Staphylococcus aureus the most sensitive germ towards phenoxyethanol in o/w-emulsion gels.
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