Filtern
Dokumenttyp
- Zeitschriftenartikel (11)
- Posterpräsentation (1)
- Forschungsdatensatz (1)
Sprache
- Englisch (13)
Schlagworte
- Certified reference material (3)
- Quality assurance (3)
- Food analysis (2)
- Sewage sludge (2)
- Toys (2)
- Acrylamide (1)
- Altenuene (1)
- Alternaria (1)
- Alternaria mycotoxins (1)
- Antagonists (1)
- Aromatic hydrocarbons (1)
- Cadmium (1)
- Chemical Safety (1)
- Cocoa (1)
- Combustion Ion Chromatography (1)
- Consumer Products (1)
- Deoxynivalenol (1)
- Environmental Chemistry (1)
- Environmental Engineering (1)
- European Reference Material (1)
- Fertilizer (1)
- Fluoride (1)
- Food Safety (1)
- Food safety (1)
- Fusarium (1)
- Fusarium mycotoxin (1)
- General Chemistry (1)
- General Medicine (1)
- Health, Toxicology and Mutagenesis (1)
- Interlaboratory comparison (1)
- Isotope-labeled (1)
- LC-MS/MS (1)
- Mass spectrometry (1)
- Microbe interactions (1)
- Microplastics (1)
- Mycotoxins (1)
- Olive oil (1)
- Organic contaminants (1)
- PAHs (1)
- PFAS (1)
- Per- and Polyfluoroalkyl substances (PFAS) (1)
- Phosphorus elimination (1)
- Phosphorus recovery (1)
- Pollution (1)
- Priority effect (1)
- Pseudomonas fluorescens (1)
- Public Health, Environmental and Occupational Health (1)
- Pyrolysis (1)
- REACH (1)
- Reference data (1)
- Reference material (1)
- SIDA-LC-MS/MS (1)
- SOM-SM (1)
- Soil (1)
- Suspended organic matter (1)
- Suzuki coupling (1)
- Tenuazonic acid (1)
- Vegetable edible oil (1)
- Wastewater (1)
- XANES (1)
- XRF (1)
Organisationseinheit der BAM
- 1.7 Organische Spuren- und Lebensmittelanalytik (13) (entfernen)
Paper des Monats
- ja (2)
Polycyclic aromatic hydrocarbons (PAH) can contaminate plastic and rubber parts of consumer products including toys. PAH are present as impurities in some of the raw materials used for production of such articles, particularly in extender oils and in carbon black. Because PAH have negative effects on health (e.g. carcinogenic), standard methods have been developed in several countries to control PAH in consumer/toy products, mainly based on gas-chromatography mass-spectrometry (GC-MS).
To protect consumers from hazards of PAH, national regulations and maximum levels are already in force, for example in Germany. Recently, maximum levels for 8 PAH compounds (benz[a]anthracene, chrysene, benzo[b]fluoranthene, benzo[k]fluoranthene, benzo[j]fluoranthene, benzo[e]pyrene, benzo[a]pyrene and dibenz[a,h]anthracene) have been established by EC-regulation 1272/2013. This resulted in an urgent need for certified reference materials (CRM) to meet the requirements of the EC-regulation (1 mg/kg for each PAH compound in consumer products and 0.5 mg/kg in toys, respectively).
In 2016 BAM started a project to certify the PAH mass fractions in a toy CRM to fill the current gap of available reference materials. Several different toys from retailers were screened to obtain a real-life material representing PAH mass fractions in the range of the EC-maximum level. The finally selected material (rubber balls for children) was prepared and characterized with respect to homogeneity and stability of 18 PAH. The extension to other health-relevant PAH compounds, e.g. indeno[1,2,3-cd]pyrene and benzo[ghi]perylene, will increase the applicability of the CRM for costumers, e.g. from industry, conformity assessment bodies and private testing laboratories.
The poster will present the current status of the ongoing CRM project including preparation of the candidate material and results from homogeneity and stability studies. In addition, first results of a joint German-Chinese interlaboratory comparison study will be shown.
Data file (RData) containing measurement data recorded during the production process of the Certified Reference Material BAM-A001 containing Polycyclic Aromatic Hydrocarbons (PAH) in olive oil. The data can be most conveniently openend using the Shiny-App eCerto which is accessible at https://www.bam.de/eCerto.
Mycotoxigenic fungal pathogens Fusarium and Alternaria are a leading cause of loss in cereal production. On wheat-ears, they are confronted by bacterial antagonists such as pseudomonads.
Studies on these groups’ interactions often neglect the infection process’s temporal aspects and the associated priority effects. In the present study, the focus was on how the first colonizer affects the subsequent ones. In a climate chamber experiment, wheat-ears were successively inoculated with two different strains (Alternaria enuissima At625, Fusarium graminearum Fg23, or Pseudomonas simiae Ps9).
Over three weeks, microbial abundances and mycotoxin concentrations were analyzed and visualized via Self Organizing Maps with Sammon Mapping (SOM-SM). All three strains revealed different characteristics and strategies to deal with co-inoculation: Fg23, as the first colonizer, suppressed the establishment of At625 and Ps9. Nevertheless, primary inoculation of At625 reduced all of the Fusarium toxins and stopped Ps9 from establishing. Ps9 showed priority effects in delaying and blocking the production of the fungal mycotoxins. The SOM-SM analysis visualized the competitive strengths: Fg23 ranked first, At625 second, Ps9 third. Our findings of species-specific priority effects in a natural environment and the role of the mycotoxins involved are relevant for developing biocontrol strategies.