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Analysis of preservatives in cosmetics—Methylisothiazolones

  • Würzburg Chromatography Colloquium
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Summary

Antimicrobially active formulations based on 2-methyl-3(2H)-isothiazolone and 5-chloro-2-methyl-3(2H)-isothiazolone (Kathon CG, Euxyl K 100) are incorporated into manufactured cosmetics as preservatives. In this paper we report on the analysis of these active components by means of liquid chromatography. It is conventional for the original methylisothiazolone components in cosmetics to be analyzed by reversed phase high-performance liquid chromatography after column chromatographic separation and flash chromatographic purification. In our new analytical method the methylisothiazolones are converted into the respective β-thiosubstituted acrylamide derivatives, which are ionic substances, with the help of the nucleophilic reagent hydrogensulfite. An ion pair high-performance liquid chromatographic method has been developed for the separation and quantification of these derivatives.

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  1. R. Matissek

    Present address: Lebensmittelchemisches Institut des Bundesverbandes der Deutschen Süßwaren Industrie e. V., Adamsstraße 52-54, D-5000, Köln 80

Authors and Affiliations

  1. Technische Universität Berlin, Institut für Lebensmittelchemie, Mueller-Breslau-Straße 10, D-1000, Berlin 12

    R. Matissek

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Matissek, R. Analysis of preservatives in cosmetics—Methylisothiazolones. Chromatographia 28, 34–38 (1989). https://doi.org/10.1007/BF02290380

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  • DOI: https://doi.org/10.1007/BF02290380

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