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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    International journal of cosmetic science 12 (1990), S. 0 
    ISSN: 1468-2494
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The stability of the formaldehyde-releaser preservative Dowicil 200 has been investigated. The studies were carried out on cosmetic emulsions preserved with different concentrations of Dowicil 200, stored in the dark at 45°C or 25°C. The degree of microbiological activity was tested with respect to S. aureus, P. aeruginosa, E. coli and A. niger using the agar diffusion and challenge tests. The chemical stability was evaluated by HPLC in the reverse phase mode. A significant preservative instability was observed.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    International journal of cosmetic science 10 (1988), S. 0 
    ISSN: 1468-2494
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Dehydroacetic acid sodium salt Prevan (DHANa) stability in presence of other cosmetic preservatives as Bronopol, Germall 115 and Kathon CG was investigated through a HPLC method that permits simultaneous determination of binary and ternary mixtures of the above preservatives.A new molecule coresponding to 3,7–dimethyl-1H, 9H, 10H, dipyrano (4,3-b: 3',4'-e) pyran-1, 9-dione has been discovered to be spontaneously formed between DHA and free or released formaldehyde. Its structure has been established by means of elemental analysis, NMR and mass spectrometry aswell as its chromatographic and antimicrobial behaviour.The magnesium salt present as stabilizer in the Kathon CG solution can also cause the formation of insoluble magnesium salt from DHANa.The ascertained chemical interaction among these preservatives is therefore discussed as a function of their cosmetic application.〈section xml:id="abs1-2"〉〈title type="main"〉Résumé: La stabilité de l'acide dehydroacééique de sel de sodium Prevan—(DHANa) a étéétudiée par la méthode HPLC en prééence d'autres conservateurs cosmétiques tels que le Bronopol, Germall 115 et Kathon CG, ce qui a permis une détermination simultanée des mélanges binaires et ternaires des conservateuis ci-dessus. Quelques interactions importantes ont été découvertes.Une nouvelle molécule correspondant à 3,7-dimethyl-1H, 9H, 10H, dipyrano (4,3-b: 3',4'-e)pyran-1, 9-dione a été découverte. Cette molécule se forme spontanément entre le DHA et le formaldehyde libre ou produit. Sa structure a étéétablie par des moyens d'analyse élementaires, NMR et spectrometrie de masse ainsi que grâce a son comportement chromatographique et antimicrobien.Le sel de magnésium présent en tant que stabilisateur dans les solutions de Kathon CG peut également inactiver DHANa par la formation d'un sel de magnésium insoluble.Par conséquent, la constatation des interactions chimiques parmi ces conservateurs est discutée comme étant une fonction de leur application cosmétique.
    Type of Medium: Electronic Resource
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