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Infrared spectroscopy for tracing of topically applied ointment vehicles and active substances on healthy skin

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Summary

Infrared spectroscopy was used to trace active substances and ointment vehicles applied on the skin. Vaseline and lanoline could be traced after 8 hrs but not olive oil. From the active substances, ethyl-4-amino-benzoate (5%), clioquinol (5%), parabenes (15%), 5,7-dichlor-8-hydroxy-2-methyl-chinolin (5%), balsam of Peru (25%) and pyroleum pini (12%) could be traced 1 hr after application but had disappeared after 8 hrs. Ethylenediamine (1%), chlorcresol (1%), pyroleum lithantracis (5%), were not traceable after 1 hr, and curiously neither neomycine sulphate in spite of its high concentration (20%). The reaction of the skin surface lipids, after application of different substances, was deduced from the spectra. Clioquinol and pyroleum lithantracis seem to give rise to hydrolysis of the triglycerides, the free fatty acids being clearly identifiable. It is felt that infrared spectroscopy can be used as an effective method to trace different substances such as potent allergens on healthy or diseased skin.

Zusammenfassung

Mit Hilfe von Infrarotspektroskopie wurde versucht aktive Substanzen wie auch Salbengrundlagen nach lokaler Applikation auf der Haut nachzuweisen. Im Gegensatz zum Olivenölkonnten Vaseline und Lanolin 8 Std nach Auftragung gefunden werden. Von den aktiven Substanzen wurden Äthyl-4-amino-benzoat (5%), Clioquinol (5%), Parabene (15%), 5,7-Dichlor-8-hydroxy-2-methyl-chinolin (5%), Perubalsam (25%) und Pyroleum pini (12%) 1 Std nach Auftragung nachgewiesen. Nach 8 Std waren diese Substanzen nicht mehr nachweisbar. Äthylendiamin (1%), Chlorkresol (1%) und Pyroleum lithantracis (5%) wurden nach 1 Std nicht gefunden, interessanterweise gelang auch der Nachweis von Neomycinsulfat trotz hoher Konzentration (20%) nicht. Durch Clioquinol und Pyroleum lithantracis werden wahrscheinlich Triglyceride hydrolisiert, die freien Fettsäuren lassen sich sicher nachweisen.

Mit der Infrarotspektroskopie bietet sich eine wertvolle Methode an, mit der verschiedene Substanzen, beispielsweise starke Allergene, in kranker wie auch in gesunder Haut nachgewiesen werden können.

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References

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  2. Colthup, N. B., Daly, L. H., Wiberly, S. E.: Introduction to infrared and Raman spectroscopy. New York and London: Academic Press 1964

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  3. Hellgren, L., Vincent, J.: Skin surface retention time of an applied ointment. Dermatologica (Basel)149, 39–42 (1974)

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Fischmeister, I., Hellgren, L. & Vincent, J. Infrared spectroscopy for tracing of topically applied ointment vehicles and active substances on healthy skin. Arch. Derm. Res. 253, 63–69 (1975). https://doi.org/10.1007/BF00557981

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  • DOI: https://doi.org/10.1007/BF00557981

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