Auflistung nach Autor:in "Moos, Rebecca K."

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Daily intake and hazard index of parabens based upon 24 h urine samples of the German Environmental Specimen Bank from 1995 to 2012
(2016) Moos, Rebecca K.; Apel, Petra; Schröter-Kermani, Christa; Kolossa-Gehring, Marike; Brüning, Thomas; Koch, Holger M.
In recent years, exposure to parabens has become more of a concern because of evidence of ubiquitous exposure in the general population, combined with evidence of their potency as endocrine disruptors. New human metabolism data from oral exposure experiments enable us to back calculate daily paraben intakes from urinary paraben levels. We report daily intakes (DIs) for six parabens based on 660 24h urine samples from the German Environmental Specimen Bank collected between 1995 and 2012. Median DI values ranged between 1.1Ţg/kg bw/day for iso-butyl paraben and 47.5Ţg/kg bw/day for methyl paraben. The calculated DIs were compared with acceptable levels of exposure to evaluate the hazard quotients (HQs) that indicate that acceptable exposure is exceeded for values of >1. Approximately 5% of our study population exceeded this threshold for individual paraben exposure. The hazard index (HI) that takes into account the cumulative risk of adverse estrogenic effects was 1.3 at the 95th percentile and 4.4 at maximum intakes, mainly driven by n-propyl paraben exposure. HI values of >1 indicate some level of concern. However, we have to point out that we applied most conservative assumptions in the HQ/HI calculations. Also, major exposure reduction measures were enacted in the European Union after 2012. Quelle: www.nature.com
Parabens and other phenols in urine samples of the German Environmental Specimen Bank (ESBHum) from 1995 to 2012
(2013) Moos, Rebecca K.; Kolossa-Gehring, Marike; Apel, Petra; Angerer, Jürgen; Brüning, Thomas; Koch, Holger M.
Because of the ubiquitous presence and the extensive use of parabensand other phenolic substances (like triclosan, triclocarban or benzophenones) in personal care and consumer products, food and beverage processing, pharmaceuticals and disinfectants humans are constantly exposed to these substances. Some of these substances are suspected to affect the endocrine system of humans. The German Environmental Specimen Bank (ESBHum) - supervised and scientifically coordinated by the German Federal Environment Agency (UBA) - archives human specimens since 1985 and thus allows assessing trends of human exposure. We quantified the body burden to these substances (9 parabens and 6 other phenolic substances) by analyzing 660 urine samples of the ESBHum (24h-urines) from the years 1995, 1997, 1999, 2001, 2003, 2005-2009 and 2012; 60 samples per year, from 30 male and 30 female volunteers (age: 21-29 years). We applied a newly developed highly sensitive on-line HPLC-MS/MS method, for the determination of these substances in urine. Analytical limits of quantification were in the range from 0.5 to 2 Ţg/L. The total concentration of the analytes (free and conjugated species) was measured. All samples were blinded before analysis. In nearly all samples parabens could be quantified.Median concentrations over the different years were around 40 Ţg/L for methyl-, 2 Ţg/L for ethyl- and 5 Ţg/L for n-propyl paraben. For the parabens this mainly reflects their consumption volume being highest for methyl paraben, followed by ethyl-, propyl- and butyl paraben. Triclosan was detected in around 60% of all samples analyzed. Median benzophenone-3 levels fell from around 2.5 Ţg/L (1995-2003) to < LOQ (2005-2012). For all other analytes medians are below the LOQ. Over the years we observed rather constant levels of exposures, except for the decrease in benzophenone-3. This retrospective study provides first data on internal exposures to the above substances in Germany from 1995 till 2012. Quelle: http://ehp.niehs.nih.gov
Time trends of paraben exposure in Germany
(2018) Kolossa-Gehring, Marike; Moos, Rebecca K.; Weber, Till; Rüther, Maria; Conrad, André; Schmied-Tobies, Maria Irene Hilde