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Oluwakayode A, Sulyok M, Krska R, Medina A. The effect of the interactions of water activity, and temperature on OTA, OTB, and OTα produced by Penicillium verrucosum in a mini silo of natural and inoculated wheat using CO 2 production as fungal activity sentinel. Food Chem 2024; 460:140590. [PMID: 39067424 DOI: 10.1016/j.foodchem.2024.140590] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2024] [Revised: 07/05/2024] [Accepted: 07/22/2024] [Indexed: 07/30/2024]
Abstract
Ochratoxin A (OTA) is a nephrotoxin that contaminates grains in storage. Moisture and temperature sensors give delayed responses due to their slow kinetic movement within the silo. This study examines if CO2 production could predict OTA contamination and identify storage conditions exceeding the maximum limit (5 μg/kg). The impact of water activity levels (0.70-0.90 aw), temperatures (15 and 20 °C), and storage duration on (a)Penicillium verrucosum population, (b)CO2 respiration rates (RR), and (c)ochratoxins concentrations in stored wheat was investigated. 96 samples were analysed for ochratoxins with LCMS-MS. RR was >7 times higher at wetter conditions than at drier aw levels. A positive correlation between CO2, OTA, OTB, and OTα was observed at the wettest conditions. OTA exceeded the limit at >0.80 aw (16% moisture content) with RR > 0.01 mg CO2 kg-1 h-1. The knowledge of the RR of stored grain would alert grain farmers/managers to improve grain storage management.
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Affiliation(s)
- Abimbola Oluwakayode
- Applied Mycology Group, Environment and AgriFood Theme, Cranfield University, College Rd. Wharley End, Bedford MK43 0AL, UK.
| | - Michael Sulyok
- University of Natural Resources and Life Sciences Vienna, Department of Agrobiotechnology IFA-Tulln, Institute of Bioanalytics and Agro-Metabolomics, Austria.
| | - Rudolf Krska
- University of Natural Resources and Life Sciences Vienna, Department of Agrobiotechnology IFA-Tulln, Institute of Bioanalytics and Agro-Metabolomics, Austria; Institute for Global Food Security, National Measurement Laboratory: Centre of Excellence in Agriculture and Food Integrity, Queen's University Belfast, 19 Chlorine Gardens, Belfast BT9 5DL, UK.
| | - Angel Medina
- Applied Mycology Group, Environment and AgriFood Theme, Cranfield University, College Rd. Wharley End, Bedford MK43 0AL, UK.
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Cervini C, Naz N, Verheecke-Vaessen C, Medina A. Impact of predicted climate change environmental conditions on the growth of Fusarium asiaticum strains and mycotoxins production on a wheat-based matrix. Int J Food Microbiol 2024; 416:110658. [PMID: 38484608 DOI: 10.1016/j.ijfoodmicro.2024.110658] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2023] [Revised: 02/12/2024] [Accepted: 03/01/2024] [Indexed: 04/19/2024]
Abstract
Fusarium asiaticum is a predominant fungal pathogen causing Fusarium Head Blight (FHB) in wheat and barley in China and is associated with approximately £201 million in annual losses due to grains contaminated with mycotoxins. F. asiaticum produces deoxynivalenol and zearalenone whose maximum limits in cereals and cereals-derived products have been established in different countries including the EU. Few studies are available on the ecophysiological behaviour of this fungal pathogen, but nothing is known about the impact of projected climate change scenarios on its growth and mycotoxin production. Therefore, this study aimed to examine the interacting effect of i) current and increased temperature (25 vs 30 °C), ii) drought stress variation (0.98 vs 0.95 water activity; aw) and iii) existing and predicted CO2 concentrations (400 vs 1000 ppm) on fungal growth and mycotoxin production (type B trichothecenes and zearalenone) by three F. asiaticum strains (CH024b, 82, 0982) on a wheat-based matrix after 10 days of incubation. The results showed that, when exposed to increased CO2 concentration (1000 ppm) there was a significant reduction of fungal growth compared to current concentration (400 ppm) both at 25 and 30 °C, especially at 0.95 aw. The multi-mycotoxin analysis performed by LC-MS/MS qTRAP showed a significant increase of deoxynivalenol and 15-acetyldeoxynivalenol production when the CH024b strain was exposed to elevated CO2 compared to current CO2 levels. Zearalenone production by the strain 0982 was significantly stimulated by mild water stress (0.95 aw) and increased CO2 concentration (1000 ppm) regardless of the temperature. Such results highlight that intraspecies variability exist among F. asiaticum strains with some mycotoxins likely to exceed current EU legislative limits under prospected climate change conditions.
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Affiliation(s)
- Carla Cervini
- Applied Mycology Group, Environment and AgriFood Theme, Cranfield University, Cranfield, UK.
| | - Naoreen Naz
- Applied Mycology Group, Environment and AgriFood Theme, Cranfield University, Cranfield, UK
| | | | - Angel Medina
- Applied Mycology Group, Environment and AgriFood Theme, Cranfield University, Cranfield, UK
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Wang X, Zong Y, Zhou X, Xu L, He W, Quan S. Artificial Intelligence-Powered Construction of a Microbial Optimal Growth Temperature Database and Its Impact on Enzyme Optimal Temperature Prediction. J Phys Chem B 2024; 128:2281-2292. [PMID: 38437173 DOI: 10.1021/acs.jpcb.3c06526] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2024]
Abstract
Accurate prediction of enzyme optimal temperature (Topt) is crucial for identifying enzymes suitable for catalytic functions under extreme bioprocessing conditions. The optimal growth temperature (OGT) of microorganisms serves as a key indicator for estimating enzyme Topt, reflecting an evolutionary temperature balance between enzyme-catalyzed reactions and the organism's growth environments. Existing OGT databases, collected from culture collection centers, often fall short as culture temperature does not precisely represent the OGT. Models trained on such databases yield inadequate accuracy in enzyme Topt prediction, underscoring the need for a high-quality OGT database. Herein, we developed AI-based models to extract the OGT information from the scientific literature, constructing a comprehensive OGT database with 1155 unique organisms and 2142 OGT values. The top-performing model, BioLinkBERT, demonstrated exceptional information extraction ability with an EM score of 91.00 and an F1 score of 91.91 for OGT. Notably, applying this OGT database in enzyme Topt prediction achieved an R2 value of 0.698, outperforming the R2 value of 0.686 obtained using culture temperature. This emphasizes the superiority of the OGT database in predicting the enzyme Topt and underscores its pivotal role in identifying enzymes with optimal catalytic temperatures.
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Affiliation(s)
- Xiaotao Wang
- State Key Laboratory of Bioreactor Engineering, Shanghai Collaborative Innovation Center for Biomanufacturing (SCICB), East China University of Science and Technology, Shanghai 200237, China
- School of Information Science and Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Yuwei Zong
- School of Information Science and Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Xuanjie Zhou
- School of Information Science and Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Li Xu
- School of Information Science and Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Wei He
- State Key Laboratory of Bioreactor Engineering, Shanghai Collaborative Innovation Center for Biomanufacturing (SCICB), East China University of Science and Technology, Shanghai 200237, China
| | - Shu Quan
- State Key Laboratory of Bioreactor Engineering, Shanghai Collaborative Innovation Center for Biomanufacturing (SCICB), East China University of Science and Technology, Shanghai 200237, China
- Zhangjiang Institute for Advanced Study, Shanghai Jiao Tong University, Shanghai 201203, China
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Dieye CAT, Durand N, Schorr-Galindo S, Strub C, Fontana A. Impacts of abiotic factors on the growth of three commercial biological control agents, on the growth and mycotoxinogenesis of Fusarium graminearum and on their interaction. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2024; 104:932-941. [PMID: 37721389 DOI: 10.1002/jsfa.12991] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2022] [Revised: 07/03/2023] [Accepted: 09/18/2023] [Indexed: 09/19/2023]
Abstract
BACKGROUND Evolving climatic conditions impact the behavior of microorganisms. The lack of efficiency of beneficial microorganisms against pathogens can be due to these evolving abiotic factors more favorable to the development and adaptation of pathogens. It is therefore of great interest to understand their impact (especially temperature increase and relative humidity (RH) variation) on pathogenic and non-pathogenic microorganisms. This work aimed to examine the possible effects of increasing temperature (20, 25, 30 and 33 °C) and RH (40%, 50%, 60% and 80%) on the growth and mycotoxin production (deoxynivalenol (DON) and zearalenone (ZEN)) of Fusarium graminearum, on the growth of three commercial biocontrol agents (BCAs; Mycostop®, Xedavir® and Polyversum®) and on the pathogen-BCA interaction. RESULTS Results demonstrated that BCAs have contrasting impacts on the growth and mycotoxinogenesis of F. graminearum depending on abiotic factors. At 25 °C and regardless of RH, commercial BCAs limit DON production by F. graminearum, but at 30 °C and intermediate RH, Xedavir® is no longer effective. The ability of Xedavir® to control the production of ZEN production by F. graminearum is also affected by abiotic factors. However, increasing temperature has an opposite effect on its ability to control the accumulation of ZEN. Polyversum® oomycete is the BCA with the most resilient efficacy against F. graminearum toxinogenesis under the different abiotic factors. CONCLUSION This work provides new knowledge of the effect of these abiotic parameters on the interaction between BCA and F. graminearum, especially on the production of mycotoxins. It paves the way for the development of efficient and resilient mycotoxin biocontrol strategies using beneficial microorganisms against F. graminearum, thus contributing to global food security. © 2023 Society of Chemical Industry.
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Affiliation(s)
- Cheikh Ahmeth Tidiane Dieye
- UMR Qualisud, Univ Montpellier, Univ Avignon, CIRAD, Institut Agro, IRD, Univ de la Réunion, Montpellier, France
| | - Noël Durand
- UMR Qualisud, Univ Montpellier, Univ Avignon, CIRAD, Institut Agro, IRD, Univ de la Réunion, Montpellier, France
- CIRAD, UMR Qualisud, France - Qualisud, Univ Montpellier, Univ Avignon, CIRAD, Institut Agro, IRD, Univ de La Réunion, Montpellier, France
- Qualisud, Univ Montpellier, Univ Avignon, CIRAD, Institut Agro, IRD, Univ de La Réunion, Montpellier, France
| | - Sabine Schorr-Galindo
- UMR Qualisud, Univ Montpellier, Univ Avignon, CIRAD, Institut Agro, IRD, Univ de la Réunion, Montpellier, France
| | - Caroline Strub
- UMR Qualisud, Univ Montpellier, Univ Avignon, CIRAD, Institut Agro, IRD, Univ de la Réunion, Montpellier, France
| | - Angélique Fontana
- UMR Qualisud, Univ Montpellier, Univ Avignon, CIRAD, Institut Agro, IRD, Univ de la Réunion, Montpellier, France
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Zhang J, Tang X, Cai Y, Zhou WW. Mycotoxin Contamination Status of Cereals in China and Potential Microbial Decontamination Methods. Metabolites 2023; 13:metabo13040551. [PMID: 37110209 PMCID: PMC10143121 DOI: 10.3390/metabo13040551] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Revised: 04/05/2023] [Accepted: 04/10/2023] [Indexed: 04/29/2023] Open
Abstract
The presence of mycotoxins in cereals can pose a significant health risk to animals and humans. China is one of the countries that is facing cereal contamination by mycotoxins. Treating mycotoxin-contaminated cereals with established physical and chemical methods can lead to negative effects, such as the loss of nutrients, chemical residues, and high energy consumption. Therefore, microbial detoxification techniques are being considered for reducing and treating mycotoxins in cereals. This paper reviews the contamination of aflatoxins, zearalenone, deoxynivalenol, fumonisins, and ochratoxin A in major cereals (rice, wheat, and maize). Our discussion is based on 8700 samples from 30 provincial areas in China between 2005 and 2021. Previous research suggests that the temperature and humidity in the highly contaminated Chinese cereal-growing regions match the growth conditions of potential antagonists. Therefore, this review takes biological detoxification as the starting point and summarizes the methods of microbial detoxification, microbial active substance detoxification, and other microbial inhibition methods for treating contaminated cereals. Furthermore, their respective mechanisms are systematically analyzed, and a series of strategies for combining the above methods with the treatment of contaminated cereals in China are proposed. It is hoped that this review will provide a reference for subsequent solutions to cereal contamination problems and for the development of safer and more efficient methods of biological detoxification.
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Affiliation(s)
- Jing Zhang
- College of Biosystems Engineering and Food Science, Ningbo Research Institute, Zhejiang University, Hangzhou 310058, China
- School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, NSW 2006, Australia
| | - Xi Tang
- College of Biosystems Engineering and Food Science, Ningbo Research Institute, Zhejiang University, Hangzhou 310058, China
| | - Yifan Cai
- College of Biosystems Engineering and Food Science, Ningbo Research Institute, Zhejiang University, Hangzhou 310058, China
| | - Wen-Wen Zhou
- College of Biosystems Engineering and Food Science, Ningbo Research Institute, Zhejiang University, Hangzhou 310058, China
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Expression of citrinin biosynthesis gene in Liupao tea and effect of Penicillium citrinum on tea quality. Fungal Genet Biol 2022; 163:103742. [PMID: 36108886 DOI: 10.1016/j.fgb.2022.103742] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2022] [Revised: 08/19/2022] [Accepted: 09/08/2022] [Indexed: 01/06/2023]
Abstract
Similar to Pu-erh tea, Liupao tea is a post-fermented tea that is produced through natural fermentation by microorganisms. Penicillium citrinum is involved in multiple production processes of Liupao tea that can produce citrinin, a secondary metabolite with renal toxicity; however, the effect of P. citrinum on the quality of Liupao tea has not been investigated yet. Citrinin production is regulated by approximately 16 biosynthesis genes. However, little is known about the genetic background of citrinin in the complex Liupao tea system. In the present study, we cultured P. citrinum on potato dextrose agar and Liupao tea powder media and analyzed the changes of its nutritional components in Liupao tea. We selected six citrinin biosynthesis genes identified in Monascus exhibiting homology and high sequence similarity to those in P. citrinum and further analyzed the expression of citrinin biosynthesis genes in Liupao tea and the changes in citrinin yield. The results showed that the changes in nutritional components of Liupao tea were closely related to the growth and metabolism of P. citrinum and the quality of the tea. Decreases in the contents of soluble sugars (from 10.29% to 9.58%), soluble pectins (from 3.71% to 3.13%), free amino acids (from 3.84% to 3.14%), and tea polyphenols (from 22.84% to 18.78%) were noted. The Spearman's correlation analysis indicated that P. citrinum growth can improve the tea quality to some extent. Quantitative real-time PCR demonstrated that ctnA gene was a positive regulator of citrinin production regardless of the culture medium used. ctnA and orf5 expressions greatly influenced the metabolism of citrinin by P. citrinum in Liupao tea. In conclusion, the citrinin biosynthesis genes, ctnA and orf5, may be the promising targets for developing strategies to control P. citrinum infection and citrinin biosynthesis in Liupao tea.
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Yu H, Zhang J, Chen Y, Zhu J. Zearalenone and Its Masked Forms in Cereals and Cereal-Derived Products: A Review of the Characteristics, Incidence, and Fate in Food Processing. J Fungi (Basel) 2022; 8:976. [PMID: 36135701 PMCID: PMC9501528 DOI: 10.3390/jof8090976] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2022] [Revised: 09/10/2022] [Accepted: 09/14/2022] [Indexed: 11/21/2022] Open
Abstract
Zearalenone (ZEA) is known as a Fusarium-produced mycotoxin, representing a risk to cereal food safety with repercussions for economies and worldwide trade. Recent studies have reported the co-occurrence of ZEA and masked ZEA in a variety of cereals and cereal-based products, which may exert adverse effects on public health due to additive/synergistic interactions. However, the co-contamination of ZEA and masked ZEA has received little attention. In order to minimize the threats of co-contamination by ZEA and masked ZEA, it is necessary to recognize the occurrence and formation of ZEA and masked ZEA. This review focuses on the characteristics, incidence, and detection of ZEA and its masked forms. Additionally, the fate of ZEA and masked ZEA during the processing of bread, cake, biscuits, pasta, and beer, as well as the ZEA limit, are discussed. The incidence of masked ZEA is lower than that of ZEA, and the mean level of masked ZEA varies greatly between cereal samples. Published data showed a considerable degree of heterogeneity in the destiny of ZEA during cereal-based food processing, mostly as a result of the varying contamination levels and complicated food processing methods. Knowledge of the fate of ZEA and masked ZEA throughout cereal-based food processing may reduce the likelihood of severe detrimental market and trade ramifications. The revision of legislative limits of masked ZEA may become a challenge in the future.
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Affiliation(s)
| | | | | | - Jiajin Zhu
- Department of Food Science and Nutrition, Zhejiang University, Hangzhou 310029, China
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Research Progress of Safety of Zearalenone: A Review. Toxins (Basel) 2022; 14:toxins14060386. [PMID: 35737047 PMCID: PMC9230539 DOI: 10.3390/toxins14060386] [Citation(s) in RCA: 56] [Impact Index Per Article: 28.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2022] [Revised: 04/21/2022] [Accepted: 04/28/2022] [Indexed: 12/22/2022] Open
Abstract
Zearalenone, a mycotoxin produced by fungi of the genus Fusarium, widely exists in animal feed and human food. The structure of zearalenone is similar to estrogen, so it mainly has estrogenic effects on various organisms. Products contaminated with zearalenone can pose risks to animals and humans. Therefore, it is imperative to carry out toxicological research on zearalenone and evaluate its risk to human health. This paper briefly introduces the production, physical, and chemical properties of zearalenone and the research progress of its toxicity kinetics, focusing on its genetic toxicity, reproductive toxicity, hepatotoxicity, immunotoxicity, carcinogenicity, endocrine interference, and its impact on intestinal health. Finally, the progress of the risk assessment of human exposure is summarized to provide a reference for the follow-up study of zearalenone.
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HU D, XUE Y, KOU X, SHAN C, JIANG C, TANG F, JI H. Growth modeling kinetics of Alternaria alternata in dried jujube at different temperatures. FOOD SCIENCE AND TECHNOLOGY 2022. [DOI: 10.1590/fst.125621] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Die HU
- Shihezi University, China
| | | | | | | | | | | | - Hua JI
- Shihezi University, China
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10
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Solairaj D, Yang Q, Guillaume Legrand NN, Routledge MN, Zhang H. Molecular explication of grape berry-fungal infections and their potential application in recent postharvest infection control strategies. Trends Food Sci Technol 2021. [DOI: 10.1016/j.tifs.2021.08.037] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Phylogenetic analysis and growth profiles of Fusarium incarnatum-equiseti species complex strains isolated from Tunisian cereals. Int J Food Microbiol 2021; 353:109297. [PMID: 34153829 DOI: 10.1016/j.ijfoodmicro.2021.109297] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Revised: 05/26/2021] [Accepted: 06/05/2021] [Indexed: 11/22/2022]
Abstract
The Fusarium incarnatum-equiseti species complex (FIESC) is a phylogenetically rich complex. It includes more than 30 cryptic phylogenetic species, making morphological identification problematic. FIESC has previously been detected in Tunisian cereals, but knowledge on the phylogeny and the ecophysiology of their species is lacking. In this work a phylogenetic analysis was performed using partial sequences of the translation elongation factor 1a gene (EF1a) of three FIESC strains isolated from barley and wheat from Tunisia, situated south in the Mediterranean basin, and additional strains from other countries. The results indicated that all Tunisian strains clustered with FIESC 5 group (F. clavum) together with other Spanish FIESC 5 strains also isolated from cereals. Growth rate profiles of the Tunisian strains were also determined on wheat and sorghum based media at a range of temperatures (15, 20, 25, 30, 35 and 40 °C) and water potential values (-0.7, -2.8, -7.0, and -9.8 MPa, corresponding to 0.995, 0.98, 0.95 and 0.93 aw values). Optimal growth was observed at 20-30 °C and between -0.7 and -7.0 MPa on both substrates (wheat and sorghum). The highest growth rate for the three strains was seen at 25 °C combined with -2.8 MPa. The comparison between the growth profiles of Tunisian and Spanish FIESC 5 strains showed similar trends with some interesting differences regarding temperature and water potential factors. Tunisian strains seem to perform better between 15 and 30 °C and, notably, at even lower water potentials included -9.8 Mpa. This might suggest that tolerance to low water potentials might be for Tunisian strains a more important selective clue than to higher temperatures. These results appeared to be consistent with a population well adapted to the present climatic conditions and predicted scenarios for North Africa.
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Yu J, Yang M, Han J, Pang X. Fungal and mycotoxin occurrence, affecting factors, and prevention in herbal medicines: a review. TOXIN REV 2021. [DOI: 10.1080/15569543.2021.1925696] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Jingsheng Yu
- Key Lab of Chinese Medicine Resources Conservation, State Administration of Traditional Chinese Medicine of the People’s Republic of China, Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
- Engineering Research Center of Chinese Medicine Resource, Ministry of Education, Beijing, China
| | - Meihua Yang
- Key Lab of Chinese Medicine Resources Conservation, State Administration of Traditional Chinese Medicine of the People’s Republic of China, Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
| | - Jianping Han
- Key Lab of Chinese Medicine Resources Conservation, State Administration of Traditional Chinese Medicine of the People’s Republic of China, Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
- Engineering Research Center of Chinese Medicine Resource, Ministry of Education, Beijing, China
| | - Xiaohui Pang
- Key Lab of Chinese Medicine Resources Conservation, State Administration of Traditional Chinese Medicine of the People’s Republic of China, Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
- Engineering Research Center of Chinese Medicine Resource, Ministry of Education, Beijing, China
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13
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Ackerman A, Wenndt A, Boyles R. The Sorghum Grain Mold Disease Complex: Pathogens, Host Responses, and the Bioactive Metabolites at Play. FRONTIERS IN PLANT SCIENCE 2021; 12:660171. [PMID: 34122480 PMCID: PMC8192977 DOI: 10.3389/fpls.2021.660171] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Accepted: 04/21/2021] [Indexed: 06/12/2023]
Abstract
Grain mold is a major concern in sorghum [Sorghum bicolor (L.) Moench] production systems, threatening grain quality, safety, and nutritional value as both human food and livestock feed. The crop's nutritional value, environmental resilience, and economic promise poise sorghum for increased acreage, especially in light of the growing pressures of climate change on global food systems. In order to fully take advantage of this potential, sorghum improvement efforts and production systems must be proactive in managing the sorghum grain mold disease complex, which not only jeopardizes agricultural productivity and profitability, but is also the culprit of harmful mycotoxins that warrant substantial public health concern. The robust scholarly literature from the 1980s to the early 2000s yielded valuable insights and key comprehensive reviews of the grain mold disease complex. Nevertheless, there remains a substantial gap in understanding the complex multi-organismal dynamics that underpin the plant-pathogen interactions involved - a gap that must be filled in order to deliver improved germplasm that is not only capable of withstanding the pressures of climate change, but also wields robust resistance to disease and mycotoxin accumulation. The present review seeks to provide an updated perspective of the sorghum grain mold disease complex, bolstered by recent advances in the understanding of the genetic and the biochemical interactions among the fungal pathogens, their corresponding mycotoxins, and the sorghum host. Critical components of the sorghum grain mold disease complex are summarized in narrative format to consolidate a collection of important concepts: (1) the current state of sorghum grain mold in research and production systems; (2) overview of the individual pathogens that contribute to the grain mold complex; (3) the mycotoxin-producing potential of these pathogens on sorghum and other substrates; and (4) a systems biology approach to the understanding of host responses.
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Affiliation(s)
- Arlyn Ackerman
- Cereal Grains Breeding and Genetics, Pee Dee Research and Education Center, Department of Plant & Environmental Sciences, Clemson University, Florence, SC, United States
| | - Anthony Wenndt
- Plant Pathology and Plant-Microbe Biology, The School of Integrated Plant Sciences, Cornell University, Ithaca, NY, United States
| | - Richard Boyles
- Cereal Grains Breeding and Genetics, Pee Dee Research and Education Center, Department of Plant & Environmental Sciences, Clemson University, Florence, SC, United States
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Khan R, Ghazali FM, Mahyudin NA, Samsudin NIP. Biocontrol of Aflatoxins Using Non-Aflatoxigenic Aspergillus flavus: A Literature Review. J Fungi (Basel) 2021; 7:jof7050381. [PMID: 34066260 PMCID: PMC8151999 DOI: 10.3390/jof7050381] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Revised: 05/07/2021] [Accepted: 05/08/2021] [Indexed: 02/06/2023] Open
Abstract
Aflatoxins (AFs) are mycotoxins, predominantly produced by Aspergillus flavus, A. parasiticus, A. nomius, and A. pseudotamarii. AFs are carcinogenic compounds causing liver cancer in humans and animals. Physical and biological factors significantly affect AF production during the pre-and post-harvest time. Several methodologies have been developed to control AF contamination, yet; they are usually expensive and unfriendly to the environment. Consequently, interest in using biocontrol agents has increased, as they are convenient, advanced, and friendly to the environment. Using non-aflatoxigenic strains of A. flavus (AF−) as biocontrol agents is the most promising method to control AFs’ contamination in cereal crops. AF− strains cannot produce AFs due to the absence of polyketide synthase genes or genetic mutation. AF− strains competitively exclude the AF+ strains in the field, giving an extra advantage to the stored grains. Several microbiological, molecular, and field-based approaches have been used to select a suitable biocontrol agent. The effectiveness of biocontrol agents in controlling AF contamination could reach up to 99.3%. Optimal inoculum rate and a perfect time of application are critical factors influencing the efficacy of biocontrol agents.
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Affiliation(s)
- Rahim Khan
- Department of Food Science, Faculty of Food Science and Technology, Universiti Putra Malaysia, Serdang 43400, Malaysia; (R.K.); (N.I.P.S.)
| | - Farinazleen Mohamad Ghazali
- Department of Food Science, Faculty of Food Science and Technology, Universiti Putra Malaysia, Serdang 43400, Malaysia; (R.K.); (N.I.P.S.)
- Correspondence: ; Tel.: +60-12219-8912
| | - Nor Ainy Mahyudin
- Department of Food Service and Management, Faculty of Food Science and Technology, Universiti Putra Malaysia, Serdang 43400, Malaysia;
- Laboratory of Halal Science Research, Halal Products Research Institute, Universiti Putra Malaysia, Serdang 43400, Malaysia
| | - Nik Iskandar Putra Samsudin
- Department of Food Science, Faculty of Food Science and Technology, Universiti Putra Malaysia, Serdang 43400, Malaysia; (R.K.); (N.I.P.S.)
- Laboratory of Food Safety and Food Integrity, Institute of Tropical Agriculture and Food Security, Universiti Putra Malaysia, Serdang 43400, Malaysia
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Pitsch J, Sandner G, Huemer J, Huemer M, Huemer S, Weghuber J. FODMAP Fingerprinting of Bakery Products and Sourdoughs: Quantitative Assessment and Content Reduction through Fermentation. Foods 2021; 10:foods10040894. [PMID: 33921672 PMCID: PMC8074121 DOI: 10.3390/foods10040894] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2021] [Revised: 04/13/2021] [Accepted: 04/15/2021] [Indexed: 12/12/2022] Open
Abstract
Fermentable oligo-, di-, and monosaccharides and polyols (FODMAPs) are associated with digestive disorders and with diseases such as irritable bowel syndrome. In this study, we determined the FODMAP contents of bread, bakery products, and flour and assessed the effectiveness of sourdough fermentation for FODMAP reduction. The fermentation products were analyzed to determine the DP 2-7 and DP >7 fructooligosaccharide (FOS) content of rye and wheat sourdoughs. FOSs were reduced by Acetobacter cerevisiae, Acetobacter okinawensis, Fructilactobacillus sanfranciscensis, and Leuconostoc citreum to levels below those in rye (-81%; -97%) and wheat (-90%; -76%) flours. The fermentation temperature influenced the sourdough acetic acid to lactic acid ratios (4:1 at 4 °C; 1:1 at 10 °C). The rye sourdough contained high levels of beneficial arabinose (28.92 g/kg) and mannitol (20.82 g/kg). Our study contributes in-depth knowledge of low-temperature sourdough fermentation in terms of effective FODMAP reduction and concurrent production of desirable fermentation byproducts.
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Affiliation(s)
- Johannes Pitsch
- FFoQSI Austrian Competence Center for Feed and Food Quality, Safety and Innovation, Stelzhamerstrasse 23, 4600 Wels, Austria; (J.P.); (J.H.); (M.H.)
- Center of Excellence Food Technology and Nutrition, University of Applied Sciences Upper Austria, Stelzhamerstrasse 23, 4600 Wels, Austria;
| | - Georg Sandner
- Center of Excellence Food Technology and Nutrition, University of Applied Sciences Upper Austria, Stelzhamerstrasse 23, 4600 Wels, Austria;
| | - Jakob Huemer
- FFoQSI Austrian Competence Center for Feed and Food Quality, Safety and Innovation, Stelzhamerstrasse 23, 4600 Wels, Austria; (J.P.); (J.H.); (M.H.)
| | - Maximilian Huemer
- FFoQSI Austrian Competence Center for Feed and Food Quality, Safety and Innovation, Stelzhamerstrasse 23, 4600 Wels, Austria; (J.P.); (J.H.); (M.H.)
| | - Stefan Huemer
- Fischer Brot GmbH, Nebingerstraße 5, 4020 Linz, Austria;
| | - Julian Weghuber
- FFoQSI Austrian Competence Center for Feed and Food Quality, Safety and Innovation, Stelzhamerstrasse 23, 4600 Wels, Austria; (J.P.); (J.H.); (M.H.)
- Center of Excellence Food Technology and Nutrition, University of Applied Sciences Upper Austria, Stelzhamerstrasse 23, 4600 Wels, Austria;
- Correspondence: ; Tel.: +43-0508-044-4403
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16
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Kumar P, Mahato DK, Sharma B, Borah R, Haque S, Mahmud MC, Shah AK, Rawal D, Bora H, Bui S. Ochratoxins in food and feed: Occurrence and its impact on human health and management strategies. Toxicon 2020; 187:151-162. [DOI: 10.1016/j.toxicon.2020.08.031] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2020] [Revised: 08/30/2020] [Accepted: 08/31/2020] [Indexed: 12/14/2022]
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17
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Carboué Q, Rébufa C, Hamrouni R, Roussos S, Bombarda I. Statistical approach to evaluate effect of temperature and moisture content on the production of antioxidant naphtho-gamma-pyrones and hydroxycinnamic acids by Aspergillus tubingensis in solid-state fermentation. Bioprocess Biosyst Eng 2020; 43:2283-2294. [PMID: 32880738 DOI: 10.1007/s00449-020-02413-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Accepted: 07/20/2020] [Indexed: 12/21/2022]
Abstract
Non-ochratoxigenic Aspergillus tubingensis G131 is a filamentous fungus that can produce naphtho-gamma-pyrones (NγPs), polyketide pigments that exhibit interesting antioxidant properties. This study aims to investigate the effect of two critical parameters, temperature and moisture content on the fungus grown in solid-state fermentation using agricultural by-products (vine shoots and wheat bran) as sole medium. From the kinetic productions of secondary metabolites NγPs (asperpyrone E, dianhydroaurasperone C, fonsecin, fonsecin B and ustilaginoidin A), alkaloids (nigragilin and aspernigrin A), degradation products from the solid medium (β-D-glucose, p-coumaric acid and trans-ethyl ferulate), ergosterol and conidia obtained for different temperatures and moisture contents, a principal component analysis (PCA) was carried out to highlight the production patterns of these compounds. This approach allowed us to determine that fonsecin, the compound of higher interest-exhibiting the most interesting antiradical potential-is particularly more produced at 25 °C and 66% of moisture content. This study underlines the importance of temperature and moisture content on naphtho-gamma-pyrones and hydroxycinnamic acid production using solid-state fermentation and contributes to the development of agroindustrial by-product valorization.
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Affiliation(s)
- Quentin Carboué
- Vinovalie, ZA Les Portes du Tarn, 81370, Saint-Sulpice-la-Pointe, France. .,Aix Marseille Université, Avignon Université, CNRS, IRD, IMBE, Marseille, France.
| | - Catherine Rébufa
- Aix Marseille Université, Avignon Université, CNRS, IRD, IMBE, Marseille, France
| | - Rayhane Hamrouni
- Aix Marseille Université, Avignon Université, CNRS, IRD, IMBE, Marseille, France
| | - Sevastianos Roussos
- Aix Marseille Université, Avignon Université, CNRS, IRD, IMBE, Marseille, France
| | - Isabelle Bombarda
- Aix Marseille Université, Avignon Université, CNRS, IRD, IMBE, Marseille, France.
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Peter Mshelia L, Selamat J, Iskandar Putra Samsudin N, Rafii MY, Abdul Mutalib NA, Nordin N, Berthiller F. Effect of Temperature, Water Activity and Carbon Dioxide on Fungal Growth and Mycotoxin Production of Acclimatised Isolates of Fusarium verticillioides and F. graminearum. Toxins (Basel) 2020; 12:toxins12080478. [PMID: 32731333 PMCID: PMC7472189 DOI: 10.3390/toxins12080478] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2020] [Revised: 06/28/2020] [Accepted: 07/02/2020] [Indexed: 11/16/2022] Open
Abstract
Climate change is primarily manifested by elevated temperature and carbon dioxide (CO2) levels and is projected to provide suitable cultivation grounds for pests and pathogens in the otherwise unsuitable regions. The impacts of climate change have been predicted in many parts of the world, which could threaten global food safety and food security. The aim of the present work was therefore to examine the interacting effects of water activity (aw) (0.92, 0.95, 0.98 aw), CO2 (400, 800, 1200 ppm) and temperature (30, 35 °C and 30, 33 °C for Fusarium verticillioides and F. graminearum, respectively) on fungal growth and mycotoxin production of acclimatised isolates of F. verticillioides and F. graminearum isolated from maize. To determine fungal growth, the colony diameters were measured on days 1, 3, 5, and 7. The mycotoxins produced were quantified using a quadrupole-time-of-flight mass spectrometer (QTOF-MS) combined with ultra-high-performance liquid chromatography (UHPLC) system. For F. verticillioides, the optimum conditions for growth of fumonisin B1 (FB1), and fumonisin B2 (FB2) were 30 °C + 0.98 aw + 400 ppm CO2. These conditions were also optimum for F. graminearum growth, and zearalenone (ZEA) and deoxynivalenol (DON) production. Since 30 °C and 400 ppm CO2 were the baseline treatments, it was hence concluded that the elevated temperature and CO2 levels tested did not seem to significantly impact fungal growth and mycotoxin production of acclimatised Fusarium isolates. To the best of our knowledge thus far, the present work described for the first time the effects of simulated climate change conditions on fungal growth and mycotoxin production of acclimatised isolates of F. verticillioides and F. graminearum.
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Affiliation(s)
- Ladi Peter Mshelia
- Food Safety and Food Integrity, Institute of Tropical Agriculture and Food Security, Universiti Putra Malaysia, 43000 UPM Serdang, Selangor, Malaysia; (L.P.M.); (N.I.P.S.); (N.-A.A.M.); (N.N.)
- Department of Food Science and Technology, Faculty of Engineering, University of Maiduguri, Borno State 600230, Nigeria
| | - Jinap Selamat
- Food Safety and Food Integrity, Institute of Tropical Agriculture and Food Security, Universiti Putra Malaysia, 43000 UPM Serdang, Selangor, Malaysia; (L.P.M.); (N.I.P.S.); (N.-A.A.M.); (N.N.)
- Department of Food Science, Faculty of Food Science and Technology, Universiti Putra Malaysia, 43000 UPM Serdang, Selangor, Malaysia
- Correspondence: or ; Tel.: +603-97691146
| | - Nik Iskandar Putra Samsudin
- Food Safety and Food Integrity, Institute of Tropical Agriculture and Food Security, Universiti Putra Malaysia, 43000 UPM Serdang, Selangor, Malaysia; (L.P.M.); (N.I.P.S.); (N.-A.A.M.); (N.N.)
- Department of Food Science, Faculty of Food Science and Technology, Universiti Putra Malaysia, 43000 UPM Serdang, Selangor, Malaysia
| | - Mohd Y. Rafii
- Department of Crop Science, Faculty of Agriculture, Universiti Putra Malaysia, 43000 UPM Serdang, Selangor, Malaysia;
- Laboratory of Climate-Smart Food Crop Production, Institute of Tropical Agriculture, Universiti Putra Malaysia, 43000 UPM Serdang, Selangor, Malaysia
| | - Noor-Azira Abdul Mutalib
- Food Safety and Food Integrity, Institute of Tropical Agriculture and Food Security, Universiti Putra Malaysia, 43000 UPM Serdang, Selangor, Malaysia; (L.P.M.); (N.I.P.S.); (N.-A.A.M.); (N.N.)
- Department of Food Science and Technology, Faculty of Engineering, University of Maiduguri, Borno State 600230, Nigeria
| | - Noordiana Nordin
- Food Safety and Food Integrity, Institute of Tropical Agriculture and Food Security, Universiti Putra Malaysia, 43000 UPM Serdang, Selangor, Malaysia; (L.P.M.); (N.I.P.S.); (N.-A.A.M.); (N.N.)
| | - Franz Berthiller
- Institute of Bioanalytics and Agro-Metabolomics, Department of Agrobiotechnology (IFA-Tulln), University of Natural Resources and Life Sciences, Vienna (BOKU), Konrad-Lorenz-Str. 20, 3430 Tulln, Austria;
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Rogowska A, Pomastowski P, Sagandykova G, Buszewski B. Zearalenone and its metabolites: Effect on human health, metabolism and neutralisation methods. Toxicon 2019; 162:46-56. [PMID: 30851274 DOI: 10.1016/j.toxicon.2019.03.004] [Citation(s) in RCA: 148] [Impact Index Per Article: 29.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Revised: 02/27/2019] [Accepted: 03/03/2019] [Indexed: 10/27/2022]
Abstract
Mycotoxins are natural compounds produced as secondary metabolites by mold fungi belonging mainly to the Fusarium family, commonly found on plants such as corn or small grains in the temperate climate zone. One of these mycotoxins is zearalenone, which is classified as a xenoestrogen, an exogenous compound which resembles the structure of naturally occurring estrogens with its chemical structure. This property of zearalenone determines its ability to bind to estrogen receptors of cell and its bioaccumulation. This leads to disorders of the hormonal balance of the body, which in consequence may lead to numerous diseases of reproductive system such as prostate, ovarian, cervical or breast cancers. High risk posed by long-term exposure to contaminated food forces the modern science to develop and implement effective methods of zearalenone neutralisation. This work is a review of current state of knowledge on toxic effects of zearalenone, its metabolism in biological systems and proposed methods of its neutralisation.
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Affiliation(s)
- A Rogowska
- Centre for Modern Interdisciplinary Technologies Nicolaus Copernicus University, Wileńska 4, 87-100, Torun, Poland; Department of Environmental Chemistry and Bioanalytics, Faculty of Chemistry, Nicolaus Copernicus University, Gagarina 7, 87-100, Torun, Poland
| | - P Pomastowski
- Centre for Modern Interdisciplinary Technologies Nicolaus Copernicus University, Wileńska 4, 87-100, Torun, Poland
| | - G Sagandykova
- Centre for Modern Interdisciplinary Technologies Nicolaus Copernicus University, Wileńska 4, 87-100, Torun, Poland
| | - B Buszewski
- Centre for Modern Interdisciplinary Technologies Nicolaus Copernicus University, Wileńska 4, 87-100, Torun, Poland; Department of Environmental Chemistry and Bioanalytics, Faculty of Chemistry, Nicolaus Copernicus University, Gagarina 7, 87-100, Torun, Poland.
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21
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Antifungal Activity of Essential Oil Compounds (Geraniol and Citral) and Inhibitory Mechanisms on Grain Pathogens ( Aspergillus flavus and Aspergillus ochraceus). Molecules 2018; 23:molecules23092108. [PMID: 30131466 PMCID: PMC6225121 DOI: 10.3390/molecules23092108] [Citation(s) in RCA: 74] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2018] [Revised: 08/05/2018] [Accepted: 08/20/2018] [Indexed: 12/24/2022] Open
Abstract
The grain contamination by Aspergillus spp. has been a serious issue. This study exhibited the excellent antifungal effects of the essential oil compounds (EOCs) geraniol and citral against common grain pathogens (A. flavus and A. ochraceus) in vitro and in situ. The inhibitory mechanisms were also evaluated from the perspective of cell membrane permeability, reactive oxygen species (ROS) generation, and Aspergillus spp. growth-related gene expression. Meanwhile, the combined effects of EOCs in the vapor phase and modified atmosphere packaging (MAP) were examined to find an alternative preservation method for controlling Aspergillus spp. The results indicated that citral exhibited the antifungal activity mainly by downregulating the sporulation- and growth-related genes for both pathogens. Geraniol displayed inhibitory effectiveness against A. flavus predominantly by inducing the intracellular ROS accumulation and showed toxicity against A. ochraceus principally by changing cell membrane permeability. Furthermore, the synthetic effects of EOCs and MAP (75% CO2 and 25% N2) induced better grain quality than the current commercial fumigant AlP. These findings reveal that EOCs have potential to be a novel grain preservative for further application.
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Fusarium graminearum in Stored Wheat: Use of CO₂ Production to Quantify Dry Matter Losses and Relate This to Relative Risks of Zearalenone Contamination under Interacting Environmental Conditions. Toxins (Basel) 2018; 10:toxins10020086. [PMID: 29462982 PMCID: PMC5848187 DOI: 10.3390/toxins10020086] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2018] [Revised: 02/08/2018] [Accepted: 02/14/2018] [Indexed: 11/17/2022] Open
Abstract
Zearalenone (ZEN) contamination from Fusarium graminearum colonization is particularly important in food and feed wheat, especially during post-harvest storage with legislative limits for both food and feed grain. Indicators of the relative risk from exceeding these limits would be useful. We examined the effect of different water activities (aw; 0.95–0.90) and temperature (10–25 °C) in naturally contaminated and irradiated wheat grain, both inoculated with F. graminearum and stored for 15 days on (a) respiration rate; (b) dry matter losses (DML); (c) ZEN production and (d) relationship between DML and ZEN contamination relative to the EU legislative limits. Gas Chromatography was used to measure the temporal respiration rates and the total accumulated CO2 production. There was an increase in temporal CO2 production rates in wetter and warmer conditions in all treatments, with the highest respiration in the 25 °C × 0.95 aw treatments + F. graminearum inoculation. This was reflected in the total accumulated CO2 in the treatments. The maximum DMLs were in the 0.95 aw/20–25 °C treatments and at 10 °C/0.95 aw. The DMLs were modelled to produce contour maps of the environmental conditions resulting in maximum/minimum losses. Contamination with ZEN/ZEN-related compounds were quantified. Maximum production was at 25 °C/0.95–0.93 aw and 20 °C/0.95 aw. ZEN contamination levels plotted against DMLs for all the treatments showed that at ca. <1.0% DML, there was a low risk of ZEN contamination exceeding EU legislative limits, while at >1.0% DML, the risk was high. This type of data is important in building a database for the development of a post-harvest decision support system for relative risks of different mycotoxins.
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Tarazona A, Gómez JV, Gavara R, Mateo-Castro R, Gimeno-Adelantado JV, Jiménez M, Mateo EM. Risk management of ochratoxigenic fungi and ochratoxin A in maize grains by bioactive EVOH films containing individual components of some essential oils. Int J Food Microbiol 2018; 269:107-119. [PMID: 29421354 DOI: 10.1016/j.ijfoodmicro.2018.02.002] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2017] [Revised: 01/09/2018] [Accepted: 02/02/2018] [Indexed: 12/16/2022]
Abstract
Aspergillus steynii and Aspergillus tubingensis are possibly the main ochratoxin A (OTA) producing species in Aspergillus section Circumdati and section Nigri, respectively. OTA is a potent nephrotoxic, teratogenic, embryotoxic, genotoxic, neurotoxic, carcinogenic and immunosuppressive compound being cereals the first source of OTA in the diet. In this study bioactive ethylene-vinyl alcohol copolymer (EVOH) films containing cinnamaldehyde (CINHO), linalool (LIN), isoeugenol (IEG) or citral (CIT) which are major components of some plant essential oils (EOs) were produced and tested against A. steynii and A. tubingensis growth and OTA production in partly milled maize grains. Due to the favourable safety profile, these bioactive compounds are considered in the category "GRAS". The study was carried out under different water activity (0.96 and 0.99 aw), and temperature (24 and 32 °C) conditions. ANOVA showed that class of film, fungal species, aw and temperature and their interactions significantly affected growth rates (GR), ED50 and ED90 and the doses for total fungal growth inhibition and OTA production. The most effective EVOH films against both species were those containing CINHO. ED50, ED90 and doses for total growth and OTA inhibition were 165-405, 297-614, 333-666 μg of EVOH-CINHO/plate (25 g of maize grains), respectively, depending on environmental conditions. The least efficient were EVOH-LIN films. ED50, ED90 and doses for total growth and OTA inhibition were 2800->3330, >3330 and >3330 μg of EVOH-LIN/plate (25 g of maize grains), respectively. The effectiveness of the bioactive films increased with increasing doses. Overall, A. tubingensis was less sensitive to treatments than A. steynii. Depending on the species, aw and temperature affected GR and OTA production in a different way. In A. steynii cultures, optimal growth occurred at 0.96 aw and 32 °C while optimal OTA production happened at 0.99 aw and 32 °C. In A. tubingensis cultures optimal growth happened at 0.99 aw and 32 °C, although the best conditions for OTA production were 0.99 aw and 24 °C. Thus, these species can be very competitive in warm climates and storage conditions. The EVOH-CINHO films followed by EVOH-IEG and EVOH-CIT films, designed in this study and applied in vapour phase, can be potent antifungal agents against A. steynii and A. tubingensis and strong inhibitors of OTA biosynthesis in maize grains at very low doses. This is the first study on the impact that interacting environmental conditions and bioactive films containing individual components of EOs have on the growth of these ochratoxigenic fungi and on OTA production in maize grains.
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Affiliation(s)
- Andrea Tarazona
- Department of Microbiology and Ecology, University of Valencia, Dr. Moliner 50, 46100 Burjassot, Valencia, Spain
| | - José V Gómez
- Department of Microbiology and Ecology, University of Valencia, Dr. Moliner 50, 46100 Burjassot, Valencia, Spain
| | - Rafael Gavara
- Packaging Lab, Institute of Agrochemistry and Food Technology, CSIC, Avenida Agustín Escardino 7, 46980 Paterna, Valencia, Spain
| | - Rufino Mateo-Castro
- Department of Analytical Chemistry. University of Valencia, Dr. Moliner 50, 46100 Burjassot, Valencia, Spain
| | - José V Gimeno-Adelantado
- Department of Analytical Chemistry. University of Valencia, Dr. Moliner 50, 46100 Burjassot, Valencia, Spain
| | - Misericordia Jiménez
- Department of Microbiology and Ecology, University of Valencia, Dr. Moliner 50, 46100 Burjassot, Valencia, Spain
| | - Eva M Mateo
- Microbiology Service, Hospital Clínico Universitario, Institute for Research INCLIVA, Av. Menéndez y Pelayo 4, 46010, Valencia, Spain.
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