Zoltán Győri

Prof. Dr. Zoltán Győri

Debreceni Egyetem Mezőgazdaság-, Élelmiszertudományi és Környezetgazdálkodási Kar, Debrecen, Hungary
orcid

Research Focus & Metrics

Academic Career Length

20Years (2007-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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12 March 2021 in Toxins
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Journal Article
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Péter SiposPéter Sipos
Péter Sipos
Ferenc PelesFerenc Peles
Ferenc Peles
LBLili Dóra Brassó
Lili Dóra Brassó
BBBéla Béri
Béla Béri
TPTünde Pusztahelyi
Tünde Pusztahelyi
Zoltán GyőriZoltán Győri
Zoltán Győri
Aflatoxins (AFs) are among the most harmful fungal secondary metabolites imposing serious health risks on both household animals and humans. The more frequent occurrence of aflatoxins in the feed and food chain is clearly foreseeable as a consequence of the extreme weather conditions recorded most recently worldwide. Furthermore, production parameters, such as unadjusted variety use and improper cultural practices, can also increase the incidence of contamination. In current aflatoxin control measures, emphasis is put on prevention including a plethora of pre-harvest methods, introduced to control Aspergillus infestations and to avoid the deleterious effects of aflatoxins on public health. Nevertheless, the continuous evaluation and improvement of post-harvest methods to combat these hazardous secondary metabolites are also required. Already in-use and emerging physical methods, such as pulsed electric fields and other nonthermal treatments as well as interventions with chemical agents such as acids, enzymes, gases, and absorbents in animal husbandry have been demonstrated as effective in reducing mycotoxins in feed and food. Although most of them have no disadvantageous effect either on nutritional properties or food safety, further research is needed to ensure the expected efficacy. Nevertheless, we can envisage the rapid spread of these easy-to-use, cost-effective, and safe post-harvest tools during storage and food processing.

1 February 2021 in Toxins
Verified
Journal Article
Open access
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Ferenc PelesFerenc Peles
Ferenc Peles
Péter SiposPéter Sipos
Péter Sipos
KSKovács Szilvia
Kovács Szilvia
Zoltán GyőriZoltán Győri
Zoltán Győri
István PócsiIstván Pócsi
István Pócsi
TPTünde Pusztahelyi
Tünde Pusztahelyi
Aflatoxins (AFs) are toxic secondary metabolites produced mostly by Aspergillus species. AF contamination entering the feed and food chain has been a crucial long-term issue for veterinarians, medicals, agroindustry experts, and researchers working in this field. Although different (physical, chemical, and biological) technologies have been developed, tested, and employed to mitigate the detrimental effects of mycotoxins, including AFs, universal methods are still not available to reduce AF levels in feed and food in the last decades. Possible biological control by bacteria, yeasts, and fungi, their excretes, the role of the ruminal degradation, pre-harvest biocontrol by competitive exclusion or biofungicides, and post-harvest technologies and practices based on biological agents currently used to alleviate the toxic effects of AFs are collected in this review. Pre-harvest biocontrol technologies can give us the greatest opportunity to reduce AF production on the spot. Together with post-harvest applications of bacteria or fungal cultures, these technologies can help us strictly reduce AF contamination without synthetic chemicals.

3 February 2022 in Toxins
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Journal Article
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ZFZsuzsa Farkas
Zsuzsa Farkas
EOErika Országh
Erika Országh
TETekla Engelhardt
Tekla Engelhardt
CCCsorba Csorba
Csorba Csorba
KKKata Kerekes
Kata Kerekes
ÁJÁkos Bernard Jóźwiak
Ákos Bernard Jóźwiak
The study presents a systematic review of published scientific articles investigating the effects of interventions aiming at aflatoxin reduction at the feed production and animal feeding phases of the milk value chain in order to identify the recent scientific trends and summarize the main findings available in the literature. The review strategy was designed based on the guidance of the systematic review and knowledge synthesis methodology that is applicable in the field of food safety. The Web of Science and EBSCOhost online databases were searched with predefined algorithms. After title and abstract relevance screening and relevance confirmation with full-text screening, 67 studies remained for data extraction, which were included in the review. The most important identified groups of interventions based on their mode of action and place in the technological process are as follows: low-moisture production using preservatives, acidity regulators, adsorbents and various microbiological additives. The results of the listed publications are summarized and compared for all the identified intervention groups. The paper aimed to help feed producers, farmers and relevant stakeholders to get an overview of the most suitable aflatoxin mitigation options, which is extremely important in the near future as climate change will likely be accompanied by elevated mycotoxin levels.

Verified
Journal Article
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GKGergő Kalló
Gergő Kalló
Balázs KunkliBalázs Kunkli
Balázs Kunkli
Zoltán GyőriZoltán Győri
Zoltán Győri
ZSZoltán Szilvássy
Zoltán Szilvássy
Éva CsőszÉva Csősz
Éva Csősz
JTJozsef Tozser
Jozsef Tozser
(1) Background: Wine contains a variety of molecules with potential beneficial effects on human health. Our aim was to examine the wine components with high-resolution mass spectrometry including high-resolution tandem mass spectrometry in two wine types made from grapes with or without the fungus Botrytis cinerea, or “noble rot”. (2) For LC-MS/MS analysis, 12 wine samples (7 without and 5 with noble rotting) from 4 different wineries were used and wine components were identified and quantified. (3) Results: 288 molecules were identified in the wines and the amount of 169 molecules was statistically significantly different between the two wine types. A database search was carried out to find the molecules, which were examined in functional studies so far, with high emphasis on molecules with antiviral, anti-inflammatory and anticancer activities. (4) Conclusions: A comprehensive functional dataset related to identified wine components is also provided highlighting the importance of components with potential health benefits.

16 March 2022 in Agriculture
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Journal Article
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ACAdácsi Cintia
Adácsi Cintia
KSKovács Szilvia
Kovács Szilvia
István PócsiIstván Pócsi
István Pócsi
Zoltán GyőriZoltán Győri
Zoltán Győri
ZDZsuzsanna Dombrádi
Zsuzsanna Dombrádi
TPTünde Pusztahelyi
Tünde Pusztahelyi
Several feed preservation methods can ensure lower mycotoxin contamination levels enter the food life cycle, and a relatively common wet preservation method of forage plant materials is fermentation. This study aimed to characterize the microbiological state and mycotoxin contamination of fermented silages and haylages (corn, alfalfa, rye, and triticale), their main microbiota, and isolation of bacteria with mycotoxin resistance. Bacteria that remain viable throughout the fermentation process and possess high mycotoxin resistance can have a biotechnological benefit. Lactic acid bacteria, primarily found in corn silage, were Lactiplantibacillus plantarum isolates. Meanwhile, a high percentage of alfalfa silage and haylage was characterized by Lactiplantibacillus pentosus. In rye silage and haylage samples, Pediococci were the typical bacteria. Bacterial isolates were characterized by deoxynivalenol and zearalenon resistance. Some of them were sensitive to aflatoxin B1, while ochratoxin A caused 33–86% growth inhibition of the cultures. The mycotoxin resistant organisms are under further research, aiming for mycotoxin elimination in feed.

27 July 2023 in Metabolites
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Journal Article
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Erdenetsetseg NokhoijavErdenetsetseg Nokhoijav
Erdenetsetseg Nokhoijav
AGAndrea Guba
Andrea Guba
UVUladzislau Vadadokhau
Uladzislau Vadadokhau
JTJozsef Tozser
Jozsef Tozser
Zoltán GyőriZoltán Győri
Zoltán Győri
Éva CsőszÉva Csősz
Éva Csősz
Amino acids and biogenic amines are important components of food and beverages. In grape-derived products such as wine and wine vinegar, they can have different origins and can influence the odor and taste of the products. Their concentration is influenced by the grape variety, vintage, and winemaking process. In our study, we carried out an LC-MS-based comparative analysis of 22 grape-derived beverages, including three different wine types and four wine vinegar samples from the Tokaj region in Hungary. The concentrations of 23 amino acids and 10 biogenic amines were examined, and the differences among the sample types were analyzed. The differences in the concentrations of some metabolites between Aszú–Furmint pairs originating from the same wineries and year provide information on the effect of botrytized grape on wine composition. Our data can provide further evidence on how the production process shapes the metabolite content of beverages and highlight the nutritional value of wine vinegar.