Stefan Weigel

ORCID: 0000-0002-4197-5758
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About
Contact & Profiles
Research Areas
  • Nanoparticles: synthesis and applications
  • Analytical chemistry methods development
  • Pesticide Residue Analysis and Safety
  • Electrochemical Analysis and Applications
  • Insect and Pesticide Research
  • Cannabis and Cannabinoid Research
  • Pharmaceutical and Antibiotic Environmental Impacts
  • Biosensors and Analytical Detection
  • Advanced biosensing and bioanalysis techniques
  • Mycotoxins in Agriculture and Food
  • Antibiotics Pharmacokinetics and Efficacy
  • Analytical Chemistry and Chromatography
  • Effects and risks of endocrine disrupting chemicals
  • Heavy Metal Exposure and Toxicity
  • Bee Products Chemical Analysis
  • Botanical Research and Chemistry
  • Agricultural safety and regulations
  • Toxic Organic Pollutants Impact
  • Forensic Toxicology and Drug Analysis
  • Heavy metals in environment
  • Polyamine Metabolism and Applications
  • Pharmacological Effects and Assays
  • GABA and Rice Research
  • Coffee research and impacts
  • Plant and fungal interactions

Federal Institute for Risk Assessment
2016-2025

Wageningen University & Research
2008-2019

Eurofins (Germany)
2004-2011

University of Bern
2010

Klinik für Schlafmedizin
2007

University Hospital Münster
2007

Universität Hamburg
2001-2004

Titanium dioxide (TiO2) is a common food additive used to enhance the white color, brightness, and sometimes flavor of variety products. In this study 7 grade TiO2 materials (E171), 24 products, 3 personal care products were investigated for their content number-based size distribution particles present in these Three principally different methods have been determine particles: electron microscopy, asymmetric flow field-flow fractionation combined with inductively coupled mass spectrometry,...

10.1021/jf5011885 article EN Journal of Agricultural and Food Chemistry 2014-06-16

Nanotechnology has the potential to innovate agricultural, feed and food sectors (hereinafter referred as agri/feed/food). Applications that are marketed already include nano-encapsulated agrochemicals or nutrients, antimicrobial nanoparticles active intelligent packaging. Many nano-enabled products currently under research development, may enter market in near future. As for any other regulated product, applicants applying approval have demonstrate safe use of such new without posing undue...

10.1016/j.yrtph.2015.06.016 article EN cc-by Regulatory Toxicology and Pharmacology 2015-07-11

The European Food Safety Authority has produced this Guidance on human and animal health aspects (Part 1) of the risk assessment nanoscience nanotechnology applications in food feed chain. It covers application areas within EFSA's remit, e.g. novel foods, contact materials, food/feed additives pesticides. takes account new developments that have taken place since publication previous 2011. Potential future are suggested scientific literature for nanoencapsulated delivery systems...

10.2903/j.efsa.2018.5327 article EN cc-by-nd EFSA Journal 2018-07-01

The presence, dissolution, agglomeration state, and release of materials in the nano-size range from food containing engineered nanoparticles during human digestion is a key question for safety assessment these materials. We used an vitro model to mimic digestion. Food products subjected included (i) hot water, (ii) coffee with powdered creamer, (iii) instant soup, (iv) pancake which either contained silica as additive E551, or form synthetic amorphous 32 nm SiO2 particles were added....

10.1021/nn204728k article EN ACS Nano 2012-02-24

spICP-MS measurement with a powerful data evaluation tool is presented as fast, cost efficient and easy to use screening for metal oxide NPs in complex matrices.

10.1039/c4ja00357h article EN Journal of Analytical Atomic Spectrometry 2015-01-01

The EFSA has updated the Guidance on risk assessment of application nanoscience and nanotechnologies in food feed chain, human animal health. It covers areas within EFSA's remit, including novel foods, contact materials, food/feed additives pesticides. guidance, now Scientific Committee nano (SC Nano-RA), taken account relevant scientific studies that provide insights to physico-chemical properties, exposure hazard characterisation nanomaterials applicability. Together with accompanying...

10.2903/j.efsa.2021.6768 article EN cc-by-nd EFSA Journal 2021-08-01

Following a mandate from the European Commission, EFSA has developed Guidance on Technical Requirements (Guidance Particle-TR), defining criteria for assessing presence of fraction small particles, and setting out information requirements applications in regulated food feed product areas (e.g. novel food, food/feed additives, contact materials pesticides). These apply to particles requiring specific assessment at nanoscale conventional that do not meet definition engineered nanomaterial as...

10.2903/j.efsa.2021.6769 article EN cc-by-nd EFSA Journal 2021-08-01

Currently established and projected regulatory frameworks require the classification of materials (whether nano or non-nano) as specified by respective definitions, most which are based on size constituent particles. This brings up question if currently available techniques for particle determination capable reliably classifying that potentially fall under these definitions. In this study, a wide variety characterisation techniques, including counting, fractionating, spectroscopic has been...

10.1007/s11051-016-3461-7 article EN cc-by Journal of Nanoparticle Research 2016-06-01

Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by authors. Any queries (other than missing content) should be directed to corresponding author article.

10.2903/sp.efsa.2014.en-621 article EN EFSA Supporting Publications 2014-07-01

The risk assessment of small particles (including nanoparticles) in products used the food chain EU falls within remit European Food Safety Authority (EFSA) and has been under thorough scientific considerations for over a decade. Now that more experience is gained with evaluating novel foods, contact materials, food/feed additives pesticides, outlines regulatory safety assessments data requirements are established. This paper reviews principles underlying testing particles, referring to two...

10.1016/j.tifs.2023.01.017 article EN cc-by-nc-nd Trends in Food Science & Technology 2023-02-03

In this study, we investigate the capability of spICP-MS using time-of-flight and quadrupole mass analyzers to determine composition size distribution concentration.

10.1039/c7ja00399d article EN Journal of Analytical Atomic Spectrometry 2018-01-01

To investigate cannabinoid content and profiles, 16 cannabinoids were quantified in 30 commercial hemp seed edible oils. In addition, one oil was subjected to thermal processing up 200 °C for 60 min. UHPLC-MS/MS used analysis. The of the samples ranged from 9 279 mg kg−1 (sum) Δ9-tetrahydrocannabinol (Δ9-THC) 0.2 6.7 kg−1. Three exceeded EU Δ9-THC equivalent maximum levels 7.5 Cannabinoid profiles can provide indications different product characteristics (e.g. degree processing, variety...

10.1080/19440049.2024.2319270 article EN cc-by Food Additives & Contaminants Part A 2024-04-08
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