Zobrazeno 1 - 6
of 6
pro vyhledávání: '"R. C. Schothorst"'
Autor:
H. H. J. Somers, R. C. Schothorst
Publikováno v:
Analytical and Bioanalytical Chemistry. 381:681-685
We have developed and validated in-house a liquid chromatography and mass spectrometry (LC-MS-MS) method for determination of N-nitrosodiethanolamine (NDELA) in cosmetics. The sample is diluted with water and then a C18 clean-up is performed. The ave
Autor:
R C Schothorst, R W Stephany
Publikováno v:
International Journal of Cosmetic Science. 23:109-114
N-Nitrosamines as carcinogens in general pose a potential health risk. Since 1992, legal guidelines that restrict the occurrence of N-nitrosamines in cosmetics have been operational in the European Union. Problem issues are NDELA (N-nitrosodiethanola
Publikováno v:
Fresenius' Journal of Analytical Chemistry. 360:595-600
A gas-chromatographic method for the determination of non-derivatized sterols in duplicate 24 h diet was developed and validated. In the spring and autumn of 1994, 123 people participated in a duplicate 24 h diet study. Each participant collected one
Autor:
R. C. Schothorst, K. Bouma
Publikováno v:
Food additives and contaminants. 20(3)
Ten meat nettings were sampled from four different suppliers in the Netherlands. These meat nettings consisted both of natural rubber and of vegetable fibres. Nitrosamines were extractable up to 2 mg x kg(-1) netting, the nitrosamine being N-nitrosod
Autor:
R. C. Schothorst, H. A. M. G. Vaessen
Publikováno v:
Food additives and contaminants. 16(5)
In spring and autumn of 1994 duplicates of 24-h diets were collected from 123 respondents. One of the goals of this study was to determine the amount of nitrite and nitrate in the duplicates of 24-h diets to establish the oral daily intake of these a
Publikováno v:
Fresenius’ Zeitschrift für Analytische Chemie. 328:393-395
A comparison of performance characteristics of a grinding and a punching technique is described. Both techniques are used to obtain a representative part of a filter and collected airborne dust for solid sampling direct Zeeman atomic absorption spect