Birgit Hetzer

ORCID: 0000-0001-8471-5748
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Research Areas
  • Proteins in Food Systems
  • Genomics and Phylogenetic Studies
  • Dye analysis and toxicity
  • Nanoparticles: synthesis and applications
  • Food Chemistry and Fat Analysis
  • Fungal and yeast genetics research
  • Microencapsulation and Drying Processes
  • Plant Pathogenic Bacteria Studies
  • Analytical chemistry methods development
  • Textile materials and evaluations
  • Laser-induced spectroscopy and plasma
  • Pigment Synthesis and Properties
  • Microplastics and Plastic Pollution
  • Plant Disease Resistance and Genetics
  • Bacteriophages and microbial interactions
  • Heavy metals in environment
  • Plant Surface Properties and Treatments
  • Parasitic Diseases Research and Treatment
  • Agriculture, Plant Science, Crop Management
  • Field-Flow Fractionation Techniques
  • Fatty Acid Research and Health
  • Recycling and Waste Management Techniques
  • Horticultural and Viticultural Research
  • Consumer Attitudes and Food Labeling
  • Polymer Foaming and Composites

Max Rubner Institut
2015-2025

Karlsruhe Institute of Technology
2009-2022

FZI Research Center for Information Technology
2008

Nematode-trapping fungi (NTF) are a large and diverse group of fungi, which may switch from saprotrophic to predatory lifestyle if nematodes present. Different have developed different trapping devices, ranging adhesive cells constricting rings. After trapping, fungal hyphae penetrate the worm, secrete lytic enzymes form hyphal network inside body. We sequenced genome Duddingtonia flagrans, biotechnologically important NTF used control nematode populations in fields. The 36.64 Mb encodes...

10.1371/journal.pgen.1008029 article EN cc-by PLoS Genetics 2019-03-27

In single particle inductively coupled plasma mass spectrometry (spICP-MS), the transport efficiency is fundamental for correct determination of both number concentration and size. present study, was systematically determined on three different days with six carefully characterised gold nanoparticle (AuNP) suspensions in seven European US expert laboratories using ICP-MS instruments spICP-MS software. Both size-(TES)-and frequency-(TEF)-methods were applied. The resulting efficiencies did...

10.3390/nano12040725 article EN cc-by Nanomaterials 2022-02-21

Abstract Recent studies have indicated the presence of micro- and nanoplastics in food animal origin. To address concerns regarding human dietary plastic uptake, extensive monitoring using validated analytical methods is required. However, a major challenge analysis lies high complexity preparing samples rich macromolecular content (e.g., proteins, complex lipids), such as seafood. Consequently, this study aimed to optimise sample preparation for seafood, meat, milk, honey, eggs, ensuring...

10.1007/s00003-025-01543-x article EN cc-by Journal of Consumer Protection and Food Safety 2025-02-08

Abstract Gryllus bimaculatus powder can be a sustainable source of animal protein and is suitable ingredient for enriching gluten-free products. Enriching flours with edible insect impact the viscometric behavior blends should considered during formulation. This study explored effects substituting rice, maize, finger millet proso 5%, 10%, 15% 20% G. on pasting structural properties resulting blends. The parameters differed significantly ( ) except peak time in viscosity decreased addition...

10.1163/23524588-00001443 article EN cc-by Journal of Insects as Food and Feed 2025-02-28

Two novel, anaerobic, Gram-positive, rod-shaped bacterial strains, ResAG-85T and ResAG-96T, were isolated from a faecal sample of male human. 16S rRNA gene sequences analyses indicated that these strains represent distinct lineage within the family Eggerthellaceae. Strain showed 92.3 % similarity to type genera Eggerthella Gordonibacter. ResAG-96T clustered together with Paraeggerthella hongkongensis newly (but not validly) published genus 'Arabia massiliensis' (94.8 similarity). Analysis...

10.1099/ijsem.0.002705 article EN INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY 2018-03-14

Summary Gryllus bimaculatus (field cricket) powder is a prospect in enriching gluten‐free food products' protein and mineral contents. However, the technological impacts of replacing common cereal flours with G. are still incipient. This study aimed to characterise nutritional composition, particle morphology, size distribution (maize, rice, finger millet proso millet). Additionally, it investigated effects substituting these 5%, 10%, 15% 20% on proximate hydration colour properties. showed...

10.1111/ijfs.17185 article EN International Journal of Food Science & Technology 2024-05-10

Abstract In this paper, the structuring of liquid oils, also known as oleogelation, is systematically investigated for first time using a quasi‐quaternary mixing system approach. Native waxes with different quantities wax esters (WE), n ‐alkanes (hydrocarbons (HC)), fatty acids (FA), and alcohols (FaOH) are applied in mixtures hydrolyzed to change composition. Hydrolyzed contain high levels FA FaOH. The model systems on microscopic level (brightfield light microscopy (BFM), cryogenic...

10.1002/ejlt.202000345 article EN cc-by-nc-nd European Journal of Lipid Science and Technology 2021-05-17

The novel, anaerobic, Gram-positive, rod-shaped bacterial strain, ResAG-91T, was isolated from a faecal sample of male human volunteer. Analysis the 16S rRNA gene sequence revealed that strain ResAG-91T showed high similarity to type strains Adlercreutzia equolifaciens subsp. and celatus. whole draft genome sequences, i.e. digital DNA-DNA hybridization (dDDH) average nucleotide identity (ANI), species represents novel genus Adlercreutzia. size is 2.8 Mbp G+C content 63.3 mol%. major...

10.1099/ijsem.0.004987 article EN INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY 2021-09-08

Abstract Strain ZW T0_25 T was isolated from an onion sample ( Allium cepa var. Hytech F1) within a storage trial and proofed to be novel, aerobic, Gram-stain negative, rod-shaped bacterial strain. Analyses of the 16S rRNA gene sequence whole draft genome sequences, i.e., digital DNA–DNA hybridization (dDDH), Average Nucleotide Identity (ANI) Amino Acid (AAI) showed that this strain represents new species genus Bosea . The size is 6.19 Mbp, GC content 66.9%. As cell sugars, rhamnose, ribose...

10.1007/s00284-024-03717-6 article EN cc-by Current Microbiology 2024-06-05

The novel, aerobic, Gram-stain-positive, rod-shaped bacterial strain, ZW T2_19 T , was isolated from an onion sample ( Allium cepa var. Rijnsburger). Analyses of the 16S rRNA gene sequence revealed that represented a member genus Rathayibacter but may represent novel species this genus. whole draft genome sequences, i.e. digital DNA–DNA hybridisation (dDDH) and average nucleotide identity (ANI) all type strains confirmed represents . size is 4.01 Mbp DNA G+C content 71.8 mol%. Glucose,...

10.1099/ijsem.0.005811 article EN INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY 2023-04-11

Abstract In this study rapeseed oil based oleogels with sunflower wax, ethyl cellulose, monoacylglycerols, or mixtures of it as oleogelators are characterized in comparison to conventional bakery margarines partially hydrogenated peanut fat regard their oil‐binding capacity, hardness, and rheological behavior. Oleogels prepared 5% 10% wax monoacylglycerols respectively, show comparable properties the phases mentioned parameters. The reveal that storage loss moduli without significantly lower...

10.1002/ejlt.202200033 article EN cc-by-nc-nd European Journal of Lipid Science and Technology 2022-09-25

Here we present the description of a novel Pseudomonas species, designated rustica sp. nov., which was isolated from raw milk samples obtained Germany. Results initial 16S rRNA gene sequence analysis assigned strain into genus and showed helmanticensis, neuropathica atagonensis to be its closest relatives. Further studies including rpoB gene, multi-gene phylogenetic tree reconstruction, whole-genome comparisons, cellular fatty acid chemotaxonomic characterization clear separation known...

10.1099/ijsem.0.005288 article EN INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY 2022-04-05

Abstract Low-pressure membranes suffer from particulate, organic and biological fouling during operation. In order to elucidate the impact of nanoparticles on membrane fouling, experiments were carried out with a small test unit operated artifi cial natural waters. Both microfi ltration (MF) ultrafi (UF) used. Artifi waters made ultra pure water spiked polystyrene or magnetite sizes between 20 250 nm in varying particle concentrations. During fi tests permeability decreased time indicating...

10.5004/dwt.2009.812 article EN cc-by-nc-nd Desalination and Water Treatment 2009-09-01

Wax esters are considered to have a dominant contribution in the gelling properties of wax-based oleogels. To understand their behavior, oleogels seven different wax (total carbon number from 30 46; c = 10% [m/m]) medium-chain triglycerides oil were characterized. Scanning electron microscopy revealed that crystallize rhombic platelets with thickness 80 115 monomolecular layers. Bright field showed regularity and face length crystals increased total molecular symmetry respective ester....

10.3390/gels8090579 article EN cc-by Gels 2022-09-12

Abstract Background Powdery Mildew of Grapevine belongs to the major diseases in viticulture and requires intensive use fungicides. Genetic introgression resistance factors from wild grapes North America and, recently, China, has been successful, but wine made those varieties is still confronted with low consumer acceptance, due differences taste. Results The current work explores potential Vitis vinifera sylvestris , ancestor domesticated Grapevine, respect containing Erysiphe necator...

10.1186/s12870-023-04311-x article EN cc-by BMC Plant Biology 2023-06-07

Pearlescent pigments are used as colourants to increase the attractiveness of food products, especially in patisserie and confectionery sector. They can be seen composite materials consist thin potassium aluminium silicate (E 555, mica) platelets carrier material, coated with a metal oxide layer TiO2 171) and/or iron oxides 172). The European Food Safety Authority stated 2020 that mica-based pearlescent whole should evaluated new additives. Obtaining dependable data for particle size...

10.1080/19440049.2022.2134592 article EN Food Additives & Contaminants Part A 2022-10-28

A wide range of trendy food colourants and ready-to-eat foods containing pearlescent pigments providing glitter effects is currently on the market. These consist mica (potassium aluminium silicate) platelets generally coated with titanium dioxide and/or iron oxides. All single components are approved additives in European Union (EU) (E 555, E 171 172). However, Food Safety Authority (EFSA) has stated recently, that should be evaluated as new additives. grade was already shown to contain a...

10.1080/19440049.2021.1901998 article EN Food Additives & Contaminants Part A 2021-04-14

Abstract Animals protect themself from microbial attacks by robust skins or a cuticle as in Caenorhabditis elegans . Nematode-trapping fungi, like Arthrobotrys flagrans , overcome the barrier and colonize nematode body. While lytic enzymes are important for infection, small-secreted proteins (SSPs) without enzymatic activity, emerge crucial virulence factors. Here, we characterized NipA ( n ematode i nduced p rotein) which A. secretes at penetration site. In absence of NipA, required more...

10.1038/s41467-024-50096-4 article EN cc-by Nature Communications 2024-07-10
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