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- W1551150901 abstract "A method für the determination of N-nitrosoalkanolamines in cosmetics and toiletries is described. The ingredients used in their manufacture N-nitroso-bis-(2-hydroxyethyl)amine (N-nitrosodiethanolamine, NDELA) and N-nitroso-bis-(2-hydroxypropyl)amine (NBHPA) are almost exclusively the contaminants. The method has therefore been modified for their determination. N-Nitroso-(2-hydroxyethyl)-(2-hydroxypropyl)amine is used as the internal standard. After dilution with water, the cosmetic is adsorbed onto a kieselguhr column and extracted with n-butanol. The extract is brought to dryness, re-dissolved in chloroform/acetone (5 + 1) and transferred to a silica gel column. The column is washed and eluted with acetone. The eluate is dried and the residue is treated with N-methyl-N-trimethylsilyl-heptafluorobutyramide. Trimethylsilyl (TMS)derivatives of N-nitrosoalkanolamines are determined by gas-chromatography with a thermal energy analyzer (TEA). Recovery of the internal standard is 95% and the determination limit is 5 μg/kg, Repeated analyses of a foam bath, spiked with 30 μg/kg NDELA, gave an average content of 32 μg/kg NDELA (variation coefficient 8.8%;n=10). In order to avoid artefact formation during the clean-up process, kieselguhr containing 50% sodium ascorbate has to be used when cosmetics containing free dialkanolamines are analyzed." @default.
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- W1551150901 date "1988-03-01" @default.
- W1551150901 modified "2023-10-14" @default.
- W1551150901 title "A method for the determination of N-nitrosoalkanolamines in cosmetics" @default.
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- W1551150901 doi "https://doi.org/10.1007/bf01043319" @default.
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