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Limaye A, Liu JR. Screening and Characterization of a Chryseobacterium timonianum Strain with Aflatoxin B1 Removal Ability. Microb Physiol 2024; 34:182-196. [PMID: 39137739 DOI: 10.1159/000540803] [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: 04/15/2023] [Accepted: 08/01/2024] [Indexed: 08/15/2024]
Abstract
INTRODUCTION Aflatoxin B1 (AFB1) is a potent hepatocarcinogenic mycotoxin found in animal feed and human food components. AFB1 contamination poses severe food safety and economic consequences. METHODS In this study, we used a coumarin-selective medium to isolate bacterial strains that can remove AFB1. Among the isolated bacterial strains, strain c4a exhibited the highest AFB1 removal activity. This strain was subjected to biochemical and phylogenetic characterization. The AFB1 removal activity of the extracellular supernatant of this strain was optimized for growth medium, reaction temperature, pH, and metal ions. The degradation products were analyzed using UPLC-ESI MS/MS. RESULTS Strain c4a was found to be most closely related to Chryseobacterium timonianum. The extracellular supernatant of C. timonianum c4a grown in a modified nutrient broth (with gelatin peptone and beef extract in a 4:1 ratio) demonstrated the highest AFB1 removal activity when incubated with 1 ppm AFB1 at 60°C, pH 8, and Mn2+ or Mg2+ supplementation for 72 h. Surprisingly, the autoclaved extracellular supernatant also retained AFB1 removal activity. UPLC-ESI MS/MS analysis suggested that AFB1 was transformed into a metabolite (m/z value 285.08) by water molecule addition on furan ring double bond. CONCLUSION The AFB1 removal activity of C. timonianum c4a was extracellular, constitutive, and highly thermostable, structurally transforming AFB1 into a much less toxic product. Herein, we present the first evidence of thermostable AFB1 removal activity of a strain belonging to C. timonianum.
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Affiliation(s)
- Aniket Limaye
- Institute of Biotechnology, National Taiwan University, Taipei, Taiwan
| | - Je-Ruei Liu
- Institute of Biotechnology, National Taiwan University, Taipei, Taiwan
- Department of Animal Science and Technology, National Taiwan University, Taipei, Taiwan
- Center for Biotechnology, National Taiwan University, Taipei, Taiwan
- Agricultural Biotechnology Research Center, Academia Sinica, Taipei, Taiwan
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Shi H, Chang G, Zhang Y, Zhao Y, Wang H, Zhang J, Zhu J. Biodegradation Characteristics and Mechanism of Aflatoxin B 1 by Bacillus amyloliquefaciens from Enzymatic and Multiomics Perspectives. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2024; 72:15841-15853. [PMID: 38957116 DOI: 10.1021/acs.jafc.4c04055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/04/2024]
Abstract
Aflatoxin B1 (AFB1), a mycotoxin and natural carcinogen, commonly contaminates cereals and animal feeds, posing serious health risks to human and animal. In this study, Bacillus amyloliquefaciens ZG08 isolated from kimchi could effectively remove 80.93% of AFB1 within 72 h at 37 °C and pH 7.0. Metabolome and transcriptome analysis showed that metabolic processes including glycerophospholipid metabolism and amino acid metabolism were most affected in B. amyloliquefaciens ZG08 exposed to AFB1. The adaptation mechanism likely involved activation of the thioredoxin system to restore intracellular redox equilibrium. The key genes, tpx and gldA, overexpressed in Escherichia coli BL21, achieved degradation rates of 60.15% and 47.16% for 100 μg/kg AFB1 under optimal conditions of 37 °C and pH 8.0 and 45 °C and pH 7.0, respectively. The degradation products, identified as AFD1, were less cytotoxic than AFB1 in HepG2 cells. These findings suggest potential strategies for utilizing probiotics and engineered enzymes in AFB1 detoxification.
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Affiliation(s)
- Honghui Shi
- School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou 310018, China
| | - Guoli Chang
- School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou 310018, China
| | - Yuhuan Zhang
- School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou 310018, China
| | - Yan Zhao
- School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou 310018, China
| | - Haifeng Wang
- College of Animal Science, Zhejiang University, Hangzhou 310058, China
| | - Jinzhi Zhang
- College of Animal Science, Zhejiang University, Hangzhou 310058, China
| | - Junli Zhu
- School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou 310018, China
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Xie H, Gao L, Li Z, Mao G, Zhang H, Wang F, Lam SS, Song A. Instant catapult steam explosion combined with ammonia water: A complex technology for detoxification of aflatoxin-contaminated peanut cake with the aim of producing a toxicity-free and nutrients retention of animal feed. Heliyon 2024; 10:e32192. [PMID: 39021920 PMCID: PMC11252874 DOI: 10.1016/j.heliyon.2024.e32192] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Revised: 05/22/2024] [Accepted: 05/29/2024] [Indexed: 07/20/2024] Open
Abstract
Aflatoxin is one of the most toxic biotoxins found in contaminated agricultural products. It has strong mutagenicity, carcinogenesis and teratogenicity to humans and animals. In this study, instant catapult steam explosion combined with ammonia water was examined for its potential to degrade aflatoxin B1 in peanut cake in order to improve its utilization as a toxic-free animal feed. Incubation of AFB1-containing peanut cake followed by processing with Instant Catapult Steam Explosion (ICSE) led to approximately 79.03 % degradation of AFB1, while the degradation of AFB1 was up to 91.48 % under the treatment of ICSE combined with 4 % NH₃·H₂O at 1.2 MPa in 200 s of process time. After treatment, nutrients in peanut cake were not significantly changed. The toxicity of AFB1 degradation products was evaluated and the results showed that the toxicity of these products were found to be substantially less than that possessed by AFB1. A low chemical pollution, efficient and toxic-free technology system of AFB1 degradation was established, which detoxify aflatoxin-contaminated biomass for sustainable and safe utilization of agricultural biomass as animal feed.
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Affiliation(s)
- Hui Xie
- Collage of Life Science, Henan Agricultural University, Nongye Road No. 63, Zhengzhou, 450002, China
| | - Lei Gao
- Collage of Life Science, Henan Agricultural University, Nongye Road No. 63, Zhengzhou, 450002, China
| | - Zhimin Li
- Collage of Life Science, Henan Agricultural University, Nongye Road No. 63, Zhengzhou, 450002, China
| | - Guotao Mao
- Collage of Life Science, Henan Agricultural University, Nongye Road No. 63, Zhengzhou, 450002, China
| | - Hongsen Zhang
- Collage of Life Science, Henan Agricultural University, Nongye Road No. 63, Zhengzhou, 450002, China
| | - Fengqin Wang
- Collage of Life Science, Henan Agricultural University, Nongye Road No. 63, Zhengzhou, 450002, China
| | - Su Shiung Lam
- Pyrolysis Technology Research Group, Institute of Tropical Aquaculture and Fisheries (AKUATROP) & Institute of Tropical Biodiversity and Sustainable Development (Bio-D Tropika), Universiti Malaysia Terengganu, 21030 Kuala Nerus, Terengganu, Malaysia
| | - Andong Song
- Collage of Life Science, Henan Agricultural University, Nongye Road No. 63, Zhengzhou, 450002, China
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Feng J, Cao L, Du X, Zhang Y, Cong Y, He J, Zhang W. Biological Detoxification of Aflatoxin B 1 by Enterococcus faecium HB2-2. Foods 2024; 13:1887. [PMID: 38928828 PMCID: PMC11202875 DOI: 10.3390/foods13121887] [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: 05/11/2024] [Revised: 06/05/2024] [Accepted: 06/12/2024] [Indexed: 06/28/2024] Open
Abstract
Aflatoxin B1 (AFB1) contamination in food and feed is a global health and economic threat, necessitating the immediate development of effective strategies to mitigate its negative effects. This study focuses on the isolation and characterization of Enterococcus faecium HB2-2 (E. faecium HB2-2) as a potent AFB1-degrading microorganism, using morphological observation, biochemical profiling, and 16S rRNA sequence analysis. An incubation of E. faecium HB2-2 at 32 °C for 96 h in a pH 10 nutrient broth (NB) medium resulted in a remarkable degradation rate of 90.0% for AFB1. Furthermore, E. faecium HB2-2 demonstrated 82.9% AFB1 degradation rate in the peanut meal, reducing AFB1 levels from 105.1 to 17.9 μg/kg. The AFB1 degradation ability of E. faecium HB2-2 was found to be dependent on the fermentation supernatant. The products of AFB1 degradation by E. faecium HB2-2 were analyzed by liquid chromatography-mass spectrometry (LC-MS), and a possible degradation mechanism was proposed based on the identified degradation products. Additionally, cytotoxicity assays revealed a significant reduction in the toxicity of the degradation products compared to the parent AFB1. These findings highlight the potential of E. faecium HB2-2 as a safe and effective method for mitigating AFB1 contamination in food and feed.
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Affiliation(s)
- Jiangtao Feng
- Key Laboratory for Deep Processing of Major Grain and Oil, Ministry of Education, College of Food Science & Engineering, Wuhan Polytechnic University, Wuhan 430023, China; (J.F.); (J.H.)
- Hubei Key Laboratory for Processing and Transformation of Agricultural Products, Wuhan Polytechnic University, Wuhan 430023, China
- Engineering Research Center of Lipid-based Fine Chemicals of Hubei Province, Wuhan 430023, China
| | - Ling Cao
- Key Laboratory for Deep Processing of Major Grain and Oil, Ministry of Education, College of Food Science & Engineering, Wuhan Polytechnic University, Wuhan 430023, China; (J.F.); (J.H.)
- Hubei Key Laboratory for Processing and Transformation of Agricultural Products, Wuhan Polytechnic University, Wuhan 430023, China
| | - Xiaoyan Du
- Key Laboratory for Deep Processing of Major Grain and Oil, Ministry of Education, College of Food Science & Engineering, Wuhan Polytechnic University, Wuhan 430023, China; (J.F.); (J.H.)
| | - Yvying Zhang
- Key Laboratory for Deep Processing of Major Grain and Oil, Ministry of Education, College of Food Science & Engineering, Wuhan Polytechnic University, Wuhan 430023, China; (J.F.); (J.H.)
| | - Yanxia Cong
- Key Laboratory for Deep Processing of Major Grain and Oil, Ministry of Education, College of Food Science & Engineering, Wuhan Polytechnic University, Wuhan 430023, China; (J.F.); (J.H.)
- Hubei Key Laboratory for Processing and Transformation of Agricultural Products, Wuhan Polytechnic University, Wuhan 430023, China
| | - Junbo He
- Key Laboratory for Deep Processing of Major Grain and Oil, Ministry of Education, College of Food Science & Engineering, Wuhan Polytechnic University, Wuhan 430023, China; (J.F.); (J.H.)
- Hubei Key Laboratory for Processing and Transformation of Agricultural Products, Wuhan Polytechnic University, Wuhan 430023, China
- Engineering Research Center of Lipid-based Fine Chemicals of Hubei Province, Wuhan 430023, China
| | - Weinong Zhang
- Key Laboratory for Deep Processing of Major Grain and Oil, Ministry of Education, College of Food Science & Engineering, Wuhan Polytechnic University, Wuhan 430023, China; (J.F.); (J.H.)
- Hubei Key Laboratory for Processing and Transformation of Agricultural Products, Wuhan Polytechnic University, Wuhan 430023, China
- Engineering Research Center of Lipid-based Fine Chemicals of Hubei Province, Wuhan 430023, China
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Yang K, Luo Y, Sun T, Qiu H, Geng Q, Li Y, Liu M, Keller NP, Song F, Tian J. Nitric oxide-mediated regulation of Aspergillus flavus asexual development by targeting TCA cycle and mitochondrial function. JOURNAL OF HAZARDOUS MATERIALS 2024; 471:134385. [PMID: 38678711 DOI: 10.1016/j.jhazmat.2024.134385] [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: 03/01/2024] [Revised: 04/18/2024] [Accepted: 04/21/2024] [Indexed: 05/01/2024]
Abstract
Nitric oxide (NO) is a signaling molecule with diverse roles in various organisms. However, its role in the opportunistic pathogen Aspergillus flavus remains unclear. This study investigates the potential of NO, mediated by metabolites from A. oryzae (AO), as an antifungal strategy against A. flavus. We demonstrated that AO metabolites effectively suppressed A. flavus asexual development, a critical stage in its lifecycle. Transcriptomic analysis revealed that AO metabolites induced NO synthesis genes, leading to increased intracellular NO levels. Reducing intracellular NO content rescued A. flavus spores from germination inhibition caused by AO metabolites. Furthermore, exogenous NO treatment and dysfunction of flavohemoglobin Fhb1, a key NO detoxification enzyme, significantly impaired A. flavus asexual development. RNA-sequencing and metabolomic analyses revealed significant metabolic disruptions within tricarboxylic acid (TCA) cycle upon AO treatment. NO treatment significantly reduced mitochondrial membrane potential (Δψm) and ATP generation. Additionally, aberrant metabolic flux within the TCA cycle was observed upon NO treatment. Further analysis revealed that NO induced S-nitrosylation of five key TCA cycle enzymes. Genetic analysis demonstrated that the S-nitrosylated Aconitase Acon and one subunit of succinate dehydrogenase Sdh2 played crucial roles in A. flavus development by regulating ATP production. This study highlights the potential of NO as a novel antifungal strategy to control A. flavus by compromising its mitochondrial function and energy metabolism.
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Affiliation(s)
- Kunlong Yang
- JSNU-UWEC Joint Laboratory of Jiangsu Province Colleges and Universities, School of Life Science, Jiangsu Normal University, Xuzhou, Jiangsu 221116, China.
| | - Yue Luo
- JSNU-UWEC Joint Laboratory of Jiangsu Province Colleges and Universities, School of Life Science, Jiangsu Normal University, Xuzhou, Jiangsu 221116, China
| | - Tongzheng Sun
- JSNU-UWEC Joint Laboratory of Jiangsu Province Colleges and Universities, School of Life Science, Jiangsu Normal University, Xuzhou, Jiangsu 221116, China
| | - Han Qiu
- JSNU-UWEC Joint Laboratory of Jiangsu Province Colleges and Universities, School of Life Science, Jiangsu Normal University, Xuzhou, Jiangsu 221116, China
| | - Qingru Geng
- JSNU-UWEC Joint Laboratory of Jiangsu Province Colleges and Universities, School of Life Science, Jiangsu Normal University, Xuzhou, Jiangsu 221116, China
| | - Yongxin Li
- JSNU-UWEC Joint Laboratory of Jiangsu Province Colleges and Universities, School of Life Science, Jiangsu Normal University, Xuzhou, Jiangsu 221116, China
| | - Man Liu
- JSNU-UWEC Joint Laboratory of Jiangsu Province Colleges and Universities, School of Life Science, Jiangsu Normal University, Xuzhou, Jiangsu 221116, China
| | - Nancy P Keller
- Department of Medical Microbiology and Immunology, USA; Department of Plant Pathology, University of Wisconsin-Madison, WI, USA
| | - Fengqin Song
- JSNU-UWEC Joint Laboratory of Jiangsu Province Colleges and Universities, School of Life Science, Jiangsu Normal University, Xuzhou, Jiangsu 221116, China.
| | - Jun Tian
- JSNU-UWEC Joint Laboratory of Jiangsu Province Colleges and Universities, School of Life Science, Jiangsu Normal University, Xuzhou, Jiangsu 221116, China.
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Guo J, Zhang H, Zhao Y, Hao X, Liu Y, Li S, Wu R. Identification of a Novel Aflatoxin B 1-Degrading Strain, Bacillus halotolerans DDC-4, and Its Response Mechanisms to Aflatoxin B 1. Toxins (Basel) 2024; 16:256. [PMID: 38922150 PMCID: PMC11209560 DOI: 10.3390/toxins16060256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2024] [Revised: 05/24/2024] [Accepted: 05/27/2024] [Indexed: 06/27/2024] Open
Abstract
Aflatoxin B1 (AFB1) contamination is a food safety issue threatening human health globally. Biodegradation is an effective method for overcoming this problem, and many microorganisms have been identified as AFB1-degrading strains. However, the response mechanisms of these microbes to AFB1 remain unclear. More degrading enzymes, especially of new types, need to be discovered. In this study, a novel AFB1-degrading strain, DDC-4, was isolated using coumarin as the sole carbon source. This strain was identified as Bacillus halotolerans through physiological, biochemical, and molecular methods. The strain's degradation activity was predominantly attributable to thermostable extracellular proteins (degradation rate remained approximately 80% at 90 °C) and was augmented by Cu2+ (95.45% AFB1 was degraded at 48 h). Alpha/beta hydrolase (arylesterase) was selected as candidate AFB1-degrading enzymes for the first time as a gene encoding this enzyme was highly expressed in the presence of AFB1. Moreover, AFB1 inhibited many genes involved in the nucleotide synthesis of strain DDC-4, which is possibly the partial molecular mechanism of AFB1's toxicity to microorganisms. To survive under this stress, sporulation-related genes were induced in the strain. Altogether, our study identified a novel AFB1-degrading strain and explained its response mechanisms to AFB1, thereby providing new insights for AFB1 biodegradation.
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Affiliation(s)
- Jia Guo
- College of Food Science, Shenyang Agricultural University, Shenyang 110866, China; (J.G.); (Y.Z.); (X.H.); (Y.L.)
- Engineering Research Center of Food Fermentation Technology, Liaoning, Key Laboratory of Microbial Fermentation Technology Innovation, Shenyang 110866, China
| | - Hanlu Zhang
- Greens SCI. & TECH. Development Co., Ltd., Tangshan 063299, China;
| | - Yixuan Zhao
- College of Food Science, Shenyang Agricultural University, Shenyang 110866, China; (J.G.); (Y.Z.); (X.H.); (Y.L.)
| | - Xiaoxu Hao
- College of Food Science, Shenyang Agricultural University, Shenyang 110866, China; (J.G.); (Y.Z.); (X.H.); (Y.L.)
| | - Yu Liu
- College of Food Science, Shenyang Agricultural University, Shenyang 110866, China; (J.G.); (Y.Z.); (X.H.); (Y.L.)
| | - Suhong Li
- College of Food Science, Shenyang Agricultural University, Shenyang 110866, China; (J.G.); (Y.Z.); (X.H.); (Y.L.)
| | - Rina Wu
- College of Food Science, Shenyang Agricultural University, Shenyang 110866, China; (J.G.); (Y.Z.); (X.H.); (Y.L.)
- Engineering Research Center of Food Fermentation Technology, Liaoning, Key Laboratory of Microbial Fermentation Technology Innovation, Shenyang 110866, China
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Al-Saadi HA, Al-Sadi AM, Al-Wahaibi A, Al-Raeesi A, Al-Kindi M, Soundra Pandian SB, Al-Harrasi MMA, Al-Mahmooli IH, Velazhahan R. Rice Weevil ( Sitophilus oryzae L.) Gut Bacteria Inhibit Growth of Aspergillus flavus and Degrade Aflatoxin B1. J Fungi (Basel) 2024; 10:377. [PMID: 38921363 PMCID: PMC11205148 DOI: 10.3390/jof10060377] [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: 04/18/2024] [Revised: 05/19/2024] [Accepted: 05/20/2024] [Indexed: 06/27/2024] Open
Abstract
In this study, bacteria residing in the gut of the rice weevils (Sitophilus oryzae L.) (Coleoptera: Curculionidae) feeding on aflatoxin-contaminated corn kernels were isolated and evaluated for their ability to suppress Aspergillus flavus and to remove/degrade aflatoxin B1 (AFB1). Four morphologically distinct S. oryzae gut-associated bacterial isolates were isolated and identified as Bacillus subtilis (RWGB1), Bacillus oceanisediminis (RWGB2), Bacillus firmus (RWGB3), and Pseudomonas aeruginosa (RWGB4) based on 16S rRNA gene sequence analysis. These bacterial isolates inhibited A. flavus growth in the dual culture assay and induced morphological deformities in the fungal hyphae, as confirmed by scanning electron microscopy. All four bacterial isolates were capable of removing AFB1 from the nutrient broth medium. In addition, culture supernatants of these bacterial isolates degraded AFB1, and the degradation of toxin molecules was confirmed by liquid chromatography-mass spectrometry. The bacterial isolates, B. subtilis RWGB1, B. oceanisediminis RWGB2, and P. aeruginosa RWGB4, were capable of producing antifungal volatile organic compounds that inhibited A. flavus growth. These results suggest that the bacterial isolates from S. oryzae gut have the potential to bind and/or degrade AFB1. Further research on their application in the food and feed industries could enhance the safety of food and feed production.
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Affiliation(s)
- Haneen Abdullah Al-Saadi
- Department of Plant Sciences, College of Agricultural and Marine Sciences, Sultan Qaboos University, Al-Khoud, Muscat 123, Oman; (H.A.A.-S.); (A.M.A.-S.); (A.A.-W.); (A.A.-R.); (M.M.A.A.-H.); (I.H.A.-M.)
| | - Abdullah Mohammed Al-Sadi
- Department of Plant Sciences, College of Agricultural and Marine Sciences, Sultan Qaboos University, Al-Khoud, Muscat 123, Oman; (H.A.A.-S.); (A.M.A.-S.); (A.A.-W.); (A.A.-R.); (M.M.A.A.-H.); (I.H.A.-M.)
| | - Ali Al-Wahaibi
- Department of Plant Sciences, College of Agricultural and Marine Sciences, Sultan Qaboos University, Al-Khoud, Muscat 123, Oman; (H.A.A.-S.); (A.M.A.-S.); (A.A.-W.); (A.A.-R.); (M.M.A.A.-H.); (I.H.A.-M.)
| | - Ali Al-Raeesi
- Department of Plant Sciences, College of Agricultural and Marine Sciences, Sultan Qaboos University, Al-Khoud, Muscat 123, Oman; (H.A.A.-S.); (A.M.A.-S.); (A.A.-W.); (A.A.-R.); (M.M.A.A.-H.); (I.H.A.-M.)
| | - Mohamed Al-Kindi
- College of Medicine and Health Sciences, Sultan Qaboos University, Al-Khoud, Muscat 123, Oman;
| | | | - Majida Mohammed Ali Al-Harrasi
- Department of Plant Sciences, College of Agricultural and Marine Sciences, Sultan Qaboos University, Al-Khoud, Muscat 123, Oman; (H.A.A.-S.); (A.M.A.-S.); (A.A.-W.); (A.A.-R.); (M.M.A.A.-H.); (I.H.A.-M.)
| | - Issa Hashil Al-Mahmooli
- Department of Plant Sciences, College of Agricultural and Marine Sciences, Sultan Qaboos University, Al-Khoud, Muscat 123, Oman; (H.A.A.-S.); (A.M.A.-S.); (A.A.-W.); (A.A.-R.); (M.M.A.A.-H.); (I.H.A.-M.)
| | - Rethinasamy Velazhahan
- Department of Plant Sciences, College of Agricultural and Marine Sciences, Sultan Qaboos University, Al-Khoud, Muscat 123, Oman; (H.A.A.-S.); (A.M.A.-S.); (A.A.-W.); (A.A.-R.); (M.M.A.A.-H.); (I.H.A.-M.)
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Cai Z, Wang Y, You Y, Yang N, Lu S, Xue J, Xing X, Sha S, Zhao L. Introduction of Cellulolytic Bacterium Bacillus velezensis Z2.6 and Its Cellulase Production Optimization. Microorganisms 2024; 12:979. [PMID: 38792808 PMCID: PMC11124521 DOI: 10.3390/microorganisms12050979] [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: 03/29/2024] [Revised: 05/06/2024] [Accepted: 05/11/2024] [Indexed: 05/26/2024] Open
Abstract
Enzyme-production microorganisms typically occupy a dominant position in composting, where cellulolytic microorganisms actively engage in the breakdown of lignocellulose. Exploring strains with high yields of cellulose-degrading enzymes holds substantial significance for the industrial production of related enzymes and the advancement of clean bioenergy. This study was inclined to screen cellulolytic bacteria, conduct genome analysis, mine cellulase-related genes, and optimize cellulase production. The potential carboxymethylcellulose-hydrolyzing bacterial strain Z2.6 was isolated from the maturation phase of pig manure-based compost with algae residuals as the feedstock and identified as Bacillus velezensis. In the draft genome of strain Z2.6, 31 related cellulolytic genes were annotated by the CAZy database, and further validation by cloning documented the existence of an endo-1,4-β-D-glucanase (EC 3.2.1.4) belonging to the GH5 family and a β-glucosidase (EC 3.2.1.21) belonging to the GH1 family, which are predominant types of cellulases. Through the exploration of ten factors in fermentation medium with Plackett-Burman and Box-Behnken design methodologies, maximum cellulase activity was predicted to reach 2.98 U/mL theoretically. The optimal conditions achieving this response were determined as 1.09% CMC-Na, 2.30% salinity, and 1.23% tryptone. Validation under these specified conditions yielded a cellulose activity of 3.02 U/mL, demonstrating a 3.43-fold degree of optimization. In conclusion, this comprehensive study underscored the significant capabilities of strain Z2.6 in lignocellulolytic saccharification and its potentialities for future in-depth exploration in biomass conversion.
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Affiliation(s)
- Zhi Cai
- SDU-ANU Joint Science College, Shandong University, Weihai 264209, China; (Z.C.); (Y.W.); (Y.Y.); (N.Y.); (S.L.); (J.X.); (X.X.)
- Marine College, Shandong University, Weihai 264209, China
| | - Yi Wang
- SDU-ANU Joint Science College, Shandong University, Weihai 264209, China; (Z.C.); (Y.W.); (Y.Y.); (N.Y.); (S.L.); (J.X.); (X.X.)
| | - Yang You
- SDU-ANU Joint Science College, Shandong University, Weihai 264209, China; (Z.C.); (Y.W.); (Y.Y.); (N.Y.); (S.L.); (J.X.); (X.X.)
| | - Nan Yang
- SDU-ANU Joint Science College, Shandong University, Weihai 264209, China; (Z.C.); (Y.W.); (Y.Y.); (N.Y.); (S.L.); (J.X.); (X.X.)
| | - Shanshan Lu
- SDU-ANU Joint Science College, Shandong University, Weihai 264209, China; (Z.C.); (Y.W.); (Y.Y.); (N.Y.); (S.L.); (J.X.); (X.X.)
| | - Jianheng Xue
- SDU-ANU Joint Science College, Shandong University, Weihai 264209, China; (Z.C.); (Y.W.); (Y.Y.); (N.Y.); (S.L.); (J.X.); (X.X.)
| | - Xiang Xing
- SDU-ANU Joint Science College, Shandong University, Weihai 264209, China; (Z.C.); (Y.W.); (Y.Y.); (N.Y.); (S.L.); (J.X.); (X.X.)
- Marine College, Shandong University, Weihai 264209, China
| | - Sha Sha
- Marine College, Shandong University, Weihai 264209, China
| | - Lihua Zhao
- Marine College, Shandong University, Weihai 264209, China
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Tang Y, Liu X, Dong L, He S. Screening and identification of an aflatoxin B 1-degrading strain from the Qinghai-Tibet Plateau and biodegradation products analysis. Front Microbiol 2024; 15:1367297. [PMID: 38751722 PMCID: PMC11094616 DOI: 10.3389/fmicb.2024.1367297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2024] [Accepted: 04/03/2024] [Indexed: 05/18/2024] Open
Abstract
This research aimed to address the issue of aflatoxin B1 (AFB1) contamination, which posed severe health and economic consequences. This study involved exploring unique species resources in the Qinghai-Tibet Plateau, screening strains capable of degrading AFB1. UPLC-Q-Orbitrap HRMS and NMR were employed to examine the degradation process and identify the structure of the degradation products. Results showed that Bacillus amyloliquefaciens YUAD7, isolated from yak dung in the Qinghai-Tibet Plateau, removed 91.7% of AFB1 from TSB-AFB1 medium with an AFB1 concentration of 10 μg/mL (72 h, 37°C, pH 6.8) and over 85% of AFB1 from real food samples at 10 μg/g (72 h, 37°C), exhibiting strong AFB1 degradation activity. Bacillus amyloliquefaciens YUAD7's extracellular secretions played a major role in AFB1 degradation mediated and could still degrade AFB1 by 43.16% after boiling for 20 min. Moreover, B. amyloliquefaciens YUAD7 demonstrated the capability to decompose AFB1 through processes such as hydrogenation, enzyme modification, and the elimination of the -CO group, resulting in the formation of smaller non-toxic molecules. Identified products include C12H14O4, C5H12N2O2, C10H14O2, C4H12N2O, with a structure consisting of dimethoxyphenyl and enoic acid, dimethyl-amino and ethyl carbamate, polyunsaturated fatty acid, and aminomethyl. The results indicated that B. amyloliquefaciens YUAD7 could be a potentially valuable strain for industrial-scale biodegradation of AFB1 and providing technical support and new perspectives for research on biodegradation products.
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Affiliation(s)
| | - Xiaojing Liu
- College of Pratacultural Science, Gan Su Agricultural University, Lanzhou, China
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10
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Arimboor R. Metabolites and degradation pathways of microbial detoxification of aflatoxins: a review. Mycotoxin Res 2024; 40:71-83. [PMID: 38151634 DOI: 10.1007/s12550-023-00515-0] [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: 10/12/2023] [Revised: 12/05/2023] [Accepted: 12/14/2023] [Indexed: 12/29/2023]
Abstract
The degradation of aflatoxins using nonpathogenic microbes and their enzymes is emerging as a safe and economical alternative to chemical and physical methods for the detoxification of aflatoxins in food and feeds. Many bacteria and fungi have been identified as aflatoxin degraders. This review is focused on the chemical identification of microbial degradation products and their degradation pathways. The microbial degradations of aflatoxins are initiated by oxidation, hydroxylation, reduction, or elimination reactions mostly catalyzed by various enzymes belonging to the classes of laccase, reductases, and peroxidases. The resulting products with lesser chemical stability further undergo various reactions to form low molecular weight products. Studies on the chemical and biological nature of degraded products of aflatoxins are necessary to ensure the safety of the decontamination process. This review indicated the need for an integrated approach including decontamination studies using culture media and food matrices, proper identification and toxicity profiling of degraded products of aflatoxins, and interactions of microbes and the degradation products with food matrices for developing practical and effective microbial detoxification process.
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Affiliation(s)
- Ranjith Arimboor
- Spices Board Quality Evaluation Laboratory, SIPCOT, Gummidipoondi, Chennai, 601201, India.
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11
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Shi Y, Ouyang B, Zhang Y, Zhang W, Xu W, Mu W. Recent developments of mycotoxin-degrading enzymes: identification, preparation and application. Crit Rev Food Sci Nutr 2023; 64:10089-10104. [PMID: 37293851 DOI: 10.1080/10408398.2023.2220402] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Mycotoxins are secondary metabolites produced by fungi during their growth. They not only seriously affect the yield of food crops but also pose a threat to human and animal health. Physical and chemical methods have been widely used to reduce the production and accumulation of mycotoxins in the field or after harvest, but these methods have difficulty in completely removing mycotoxins while keeping the nutrients at the same time. Biodegradation methods using isolated enzymes have shown superiority and potential for modest reaction conditions, high degradation efficiency and degradation products with low toxicity. Therefore, the occurrence, chemical structures, and toxicology of six prevalent mycotoxins (deoxynivalenol, zearalenone, aflatoxin, patulin, fumonisin, and ochratoxin) were described in this manuscript. The identification and application of mycotoxin-degrading enzymes were thoroughly reviewed. It is believed that in the near future, mycotoxin-degrading enzymes are expected to be commercially developed and used in the feed and food industries.
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Affiliation(s)
- Yan Shi
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, China
| | - Binbin Ouyang
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, China
| | - Yulei Zhang
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, China
| | - Wenli Zhang
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, China
| | - Wei Xu
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, China
| | - Wanmeng Mu
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, China
- International Joint Laboratory on Food Safety, Jiangnan University, Wuxi, China
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12
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Namaumbo S, Monjerezi M, Gama A, Mlangeni AT, Chiutsi‐Phiri G, Matumba L. Reduction of aflatoxins during brewing of a Malawian maize-based non-alcoholic beverage, thobwa. Food Sci Nutr 2023; 11:2864-2871. [PMID: 37324882 PMCID: PMC10261816 DOI: 10.1002/fsn3.3266] [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: 10/03/2022] [Revised: 01/22/2023] [Accepted: 02/02/2023] [Indexed: 03/14/2023] Open
Abstract
This study reports onthe effect of various production steps on levels of aflatoxins during preparation of thobwa, a traditional maize-based fermented non-alcoholic beverage, brewed across Malawi. The effect of boiling, fermentation and their interaction on the level of aflatoxins, the trends of aflatoxin reduction during brewing, and the distribution of aflatoxins between the solid and liquid phases of the beverage were studied using VICAM AflaTest immunoaffinity fluorometric assay. Fermenting and boiling thobwa pre-mix-, with initial aflatoxin content of 45-183 μg/kg, resulted in aflatoxin reduction of 47% (13-61 μg/kg) on average. Fermentation and boiling contributed about 20 and 33% aflatoxin reduction, respectively, but without interactive effect between the two factors. Fermenting the thobwa for 24 h led to further reduction of aflatoxins to about 37% of the initial content, and remainedconstant for up to 8 days. Thobwa is a popular beverage in Malawi which is consumed in large quantities by all gender categories including infants, therefore the presence of aflatoxins may constitute a significant health risk factor. This study highlights the need to use raw materials with low levels of aflatoxins for production of maize-based non-alcoholic beverages to ensure consumer safety.
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Affiliation(s)
- Sydney Namaumbo
- Faculty of Life Science and Natural ResourcesLilongwe University of Agriculture and Natural Resources (LUANAR)LilongweMalawi
| | - Maurice Monjerezi
- Department of Chemistry and Chemical EngineeringUniversity of MalawiZombaMalawi
| | - Aggrey Gama
- Faculty of Food and Human Sciences, LUANARLilongweMalawi
| | - Angstone Thembachako Mlangeni
- Faculty of Life Science and Natural ResourcesLilongwe University of Agriculture and Natural Resources (LUANAR)LilongweMalawi
| | - Gabriella Chiutsi‐Phiri
- Faculty of Life Science and Natural ResourcesLilongwe University of Agriculture and Natural Resources (LUANAR)LilongweMalawi
| | - Limbikani Matumba
- Faculty of Life Science and Natural ResourcesLilongwe University of Agriculture and Natural Resources (LUANAR)LilongweMalawi
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Yuan S, Wu Y, Jin J, Tong S, Zhang L, Cai Y. Biocontrol Capabilities of Bacillus subtilis E11 against Aspergillus flavus In Vitro and for Dried Red Chili ( Capsicum annuum L.). Toxins (Basel) 2023; 15:toxins15050308. [PMID: 37235343 DOI: 10.3390/toxins15050308] [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: 03/20/2023] [Revised: 04/22/2023] [Accepted: 04/23/2023] [Indexed: 05/28/2023] Open
Abstract
As a condiment with extensive nutritional value, chili is easy to be contaminated by Aspergillus flavus (A. flavus) during field, transportation, and storage. This study aimed to solve the contamination of dried red chili caused by A. flavus by inhibiting the growth of A. flavus and detoxifying aflatoxin B1 (AFB1). In this study, Bacillus subtilis E11 (B. subtilis) screened from 63 candidate antagonistic bacteria exhibited the strongest antifungal ability, which could not only inhibit 64.27% of A. flavus but could also remove 81.34% of AFB1 at 24 h. Notably, scanning electron microscopy (SEM) showed that B. subtilis E11 cells could resist a higher concentration of AFB1, and the fermentation supernatant of B. subtilis E11 could deform the mycelia of A. flavus. After 10 days of coculture with B. subtilis E11 on dried red chili inoculated with A. flavus, the mycelia of A. flavus were almost completely inhibited, and the yield of AFB1 was significantly reduced. Our study first concentrated on the use of B. subtilis as a biocontrol agent for dried red chili, which could not only enrich the resources of microbial strains for controlling A. flavus but also could provide theoretical guidance to prolong the shelf life of dried red chili.
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Affiliation(s)
- Shenglan Yuan
- Key Laboratory of Plant Resource Conservation and Germplasm Innovation in Mountainous Region (Ministry of Education), College of Life Sciences/Institute of Agro-Bioengineering, Guizhou University, Guiyang 550025, China
| | - Yongjun Wu
- Key Laboratory of Plant Resource Conservation and Germplasm Innovation in Mountainous Region (Ministry of Education), College of Life Sciences/Institute of Agro-Bioengineering, Guizhou University, Guiyang 550025, China
| | - Jing Jin
- Key Laboratory of Plant Resource Conservation and Germplasm Innovation in Mountainous Region (Ministry of Education), College of Life Sciences/Institute of Agro-Bioengineering, Guizhou University, Guiyang 550025, China
| | - Shuoqiu Tong
- Key Laboratory of Plant Resource Conservation and Germplasm Innovation in Mountainous Region (Ministry of Education), College of Life Sciences/Institute of Agro-Bioengineering, Guizhou University, Guiyang 550025, China
| | - Lincheng Zhang
- Key Laboratory of Plant Resource Conservation and Germplasm Innovation in Mountainous Region (Ministry of Education), College of Life Sciences/Institute of Agro-Bioengineering, Guizhou University, Guiyang 550025, China
| | - Yafei Cai
- Key Laboratory of Plant Resource Conservation and Germplasm Innovation in Mountainous Region (Ministry of Education), College of Life Sciences/Institute of Agro-Bioengineering, Guizhou University, Guiyang 550025, China
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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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Kumar V, Bahuguna A, Lee JS, Sood A, Han SS, Chun HS, Kim M. Degradation mechanism of aflatoxin B1 and aflatoxin G1 by salt tolerant Bacillus albus YUN5 isolated from 'doenjang', a traditional Korean food. Food Res Int 2023; 165:112479. [PMID: 36869492 DOI: 10.1016/j.foodres.2023.112479] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2022] [Revised: 01/05/2023] [Accepted: 01/11/2023] [Indexed: 01/15/2023]
Abstract
Aflatoxins are the mycotoxins that contaminate food and feed and pose health hazards to humans and animals. Here, Bacillus albusYUN5 was isolated from doenjang (Korean fermented soybean paste) and examined for aflatoxin B1 (AFB1) and aflatoxin G1 (AFG1) degradation capabilities. The highest degradation of AFB1 (76.28 ± 0.15%) and AFG1 (98.98 ± 0.00%) was observed in the cell-free supernatant (CFS) ofB. albusYUN5, whereas negligible degradation was observed in intracellular fraction, viable cells, and cell debris. Furthermore, heat (100 °C) and proteinase K treated CFS possessed AFB1 and AFG1 degradation ability, suggesting that substances other than proteins or enzymes are responsible for the degradation. Optimal degradation of AFB1 and AFG1 by the CFS was achieved at 55 °C and 45 °C, respectively, and at pH 7-10 and salt concentration of 0-20%. Liquid chromatography-mass spectroscopy analysis of the degraded products revealed that either the difuran or lactone ring of AFB1 and lactone ring of AFG1 is the main target site by CFS of B. albus YUN5. A slightly better reduction of AFB1 and AFG1 was observed in doenjang treated with CFS and viable cells of B. albus YUN5 compared to those without CFS and B. albus YUN5 treated doenjang during one year of fermentation, suggesting the applicability of B. albus in real food.
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Affiliation(s)
- Vishal Kumar
- Department of Food Science and Technology, Yeungnam University, Gyeongsan, Gyeongsangbuk-do 38541, Republic of Korea
| | - Ashutosh Bahuguna
- Department of Food Science and Technology, Yeungnam University, Gyeongsan, Gyeongsangbuk-do 38541, Republic of Korea
| | - Jong Suk Lee
- Division of Food Science and Nutrition and Cooking, Taegu Science University, Daegu 41453, Republic of Korea.
| | - Ankur Sood
- School of Chemical Engineering, Yeungnam University, Gyeongsan 38541, Gyeongsangbuk-do, Republic of Korea.
| | - Sung Soo Han
- School of Chemical Engineering, Yeungnam University, Gyeongsan 38541, Gyeongsangbuk-do, Republic of Korea.
| | - Hyang Sook Chun
- School of Food Science and Technology, Chung-Ang University, Anseong, Gyeonggi-do 17546, Republic of Korea.
| | - Myunghee Kim
- Department of Food Science and Technology, Yeungnam University, Gyeongsan, Gyeongsangbuk-do 38541, Republic of Korea.
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Chen L, Qu Z, Yu W, Zheng L, Qiao H, Wang D, Wei B, Zhao Z. Comparative genomic and transcriptome analysis of Bacillus velezensis CL-4 fermented corn germ meal. AMB Express 2023; 13:10. [PMID: 36683079 PMCID: PMC9868226 DOI: 10.1186/s13568-023-01510-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2022] [Accepted: 01/08/2023] [Indexed: 01/24/2023] Open
Abstract
Bacillus, an excellent organic-degrading agent, can degrade lignocellulose. Notably, some B. velezensis strains encode lignocellulases. However, their ability to degrade lignocellulose in fermented feed is not much appreciated. This study performed a comparative genomic analysis of twenty-three B. velezensis strains to find common carbohydrate-active enzymes (CAZymes) encoding genes and evaluated their potential to degrade lignocellulose. The comparative genomic and CAZyme database-based analyses identified several potential CAZymes genes that degrade cellulose (GH1, GH4, GH5, GH13, GH16, GH32, PL1, and PL9), hemicellulose (GH11, GH26, GH43, GH51, and CE3) and lignin (AA4, AA6, AA7, and AA10). Furthermore, Illumina RNA-seq transcriptome analysis revealed the expression of more than 1794 genes in B. velezensis CL-4 fermented corn germ meal at 48 h (FCGM 48 h). Gene ontology analysis of expressed genes revealed their enrichment in hydrolase activity (breaking the glycosyl bonds during carbohydrate metabolism), indicating the upregulation of CAZymes. In total, 58 differentially upregulated CAZymes-encoding genes were identified in FCGM 48 h compared to FCGM 0 h. The upregulated CAZymes-encoding genes were related to cellulose (6-phospho-β-galactosidase and 6-phospho-α-glucosidase), starch (α-glucosidase and α-amylase), pectin (pectin lyase), and hemicellulose (arabinan endo-1,5-α-L-arabinosidase, xylan 1,4-beta-xylosidase, α-N-arabinofuranosidase, and acetyl xylan esterase). Importantly, arabinoxylan degradation mainly occurred in FCGM 48 h, followed by partial degradation of cellulose, pectin, and starch. This study can support the development of enzymatic cocktails for the solid-state fermented feed (SFF).
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Affiliation(s)
- Long Chen
- grid.464388.50000 0004 1756 0215Institute of Animal Nutrition and Feed, Jilin Academy of Agricultural Sciences, No. 186 Dong Xinghua Street, Gongzhuling, 136100 Jilin China
| | - Zihui Qu
- grid.464388.50000 0004 1756 0215Institute of Animal Nutrition and Feed, Jilin Academy of Agricultural Sciences, No. 186 Dong Xinghua Street, Gongzhuling, 136100 Jilin China
| | - Wei Yu
- grid.464388.50000 0004 1756 0215Institute of Animal Nutrition and Feed, Jilin Academy of Agricultural Sciences, No. 186 Dong Xinghua Street, Gongzhuling, 136100 Jilin China
| | - Lin Zheng
- grid.464388.50000 0004 1756 0215Institute of Animal Nutrition and Feed, Jilin Academy of Agricultural Sciences, No. 186 Dong Xinghua Street, Gongzhuling, 136100 Jilin China
| | - Haixin Qiao
- Information Application Department, Jilin Intellectual Property Protection Center, Changchun, 130000 China
| | - Dan Wang
- grid.464388.50000 0004 1756 0215Institute of Animal Nutrition and Feed, Jilin Academy of Agricultural Sciences, No. 186 Dong Xinghua Street, Gongzhuling, 136100 Jilin China
| | - Bingdong Wei
- grid.464388.50000 0004 1756 0215Institute of Animal Nutrition and Feed, Jilin Academy of Agricultural Sciences, No. 186 Dong Xinghua Street, Gongzhuling, 136100 Jilin China
| | - Zijian Zhao
- grid.464388.50000 0004 1756 0215Institute of Agro-Food Technology, Jilin Academy of Agricultural Sciences, No. 1366 Cai Yu Street, Changchun, 130033 Jilin Province China
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Ahmad MM, Qamar F, Saifi M, Abdin MZ. Natural inhibitors: A sustainable way to combat aflatoxins. Front Microbiol 2022; 13:993834. [PMID: 36569081 PMCID: PMC9773886 DOI: 10.3389/fmicb.2022.993834] [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: 07/14/2022] [Accepted: 10/31/2022] [Indexed: 12/13/2022] Open
Abstract
Among a few hundred mycotoxins, aflatoxins had always posed a major threat to the world. Apart from A. flavus, A. parasiticus, and A. nomius of Aspergillus genus, which are most toxin-producing strains, several fungal bodies including Fusarium, Penicillium, and Alternaria that can biosynthesis aflatoxins. Basically, there are four different types of aflatoxins (Aflatoxin B1 (AFB1), Aflatoxin B2 (AFB2), Aflatoxin G1 (AFG1), Aflatoxin G2 (AFG2)) are produced as secondary metabolites. There are certainly other types of aflatoxins found but they are the by-products of these toxins. The fungal agents generally infect the food crops during harvesting, storing, and/or transporting; making a heavy post-harvest as well as economic loss in both developed and developing countries. And while ingesting the crop products, these toxins get into the dietary system causing aflatoxicosis, liver cirrhosis, etc. Therefore, it is imperative to search for certain ways to control the spread of infections and/or production of these toxins which may also not harm the crop harvest. In this review, we are going to discuss some sustainable methods that can effectively control the spread of infection and inhibit the biosynthesis of aflatoxins.
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Affiliation(s)
- Malik M. Ahmad
- Department of Agriculture, Integral Institute of Agricultural Science and Technology (IIAST), Integral University, Lucknow, India
| | - Firdaus Qamar
- CTPD, Department of Biotechnology, School of Chemical and Life Sciences, New Delhi, India
| | - Monica Saifi
- CTPD, Department of Biotechnology, School of Chemical and Life Sciences, New Delhi, India
| | - Malik Zainul Abdin
- CTPD, Department of Biotechnology, School of Chemical and Life Sciences, New Delhi, India,*Correspondence: Malik Zainul Abdin,
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Boukaew S, Prasertsan P, Mahasawat P, Sriyatep T, Petlamul W. Efficacy of the antifungal metabolites of Streptomyces philanthi RL-1-178 on aflatoxin degradation with its application to prevent aflatoxigenic fungi in stored maize grains and identification of the bioactive compound. World J Microbiol Biotechnol 2022; 39:24. [PMID: 36422721 DOI: 10.1007/s11274-022-03470-7] [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: 09/27/2022] [Accepted: 11/15/2022] [Indexed: 11/25/2022]
Abstract
Aflatoxin B1 is a potent carcinogen produced by Aspergillus flavus (A. flavus) and Aspergillus. parasiticus (A. parasiticus), mainly during grain storage. The efficacy of the freeze-dried culture filtrate of Streptomyces philanthi (S. philanthi) strain RL-1-178 (DCF) on degradation of aflatoxin B1 (AFB1) were evaluated and its bioactive compounds were identified. The DCF at a concentration of 9.0% (w/v) completely inhibited growth and AFB1 production of A. parasiticus TISTR 3276 and A. flavus PSRDC-4 after 7 days tested in yeast-extract sucrose (YES) medium and on stored maize grains after 28 and 14 days incubation, respectively. This indicated the more tolerance of A. parasiticus over A. flavus. The DCF and bacterial cells of S. philanthi were capable to degrade AFB1 by 85.0% and 100% for 72 h and 8 days, respectively. This confirmed the higher efficacy of the DCF over the cells. After separation of the DCF on thin-layer chromatography (TLC) plate by bioautography bioassay, each active band was identified by liquid chromatography-quadrupole time of flight mass spectrometer (LC-Q-TOF MS/MS). The results revealed two compounds which were identified as azithromycin and an unknown based on mass ions of both ESI+ and ESI- modes. The antifungal metabolites in the culture filtrate of S. philanthi were proved to degrade aflatoxin B1. It could be concluded that the DCF may be applied to prevent the growth of the two aflatoxin-producing fungi as well as the occurrence of aflatoxin in the stored maize grains.
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Affiliation(s)
- Sawai Boukaew
- College of Innovation and Management, Songkhla Rajabhat University, Songkhla, 90000, Thailand.
| | - Poonsuk Prasertsan
- Research and Development Office, Prince of Songkla University, Songkhla, 90112, Thailand
| | - Pawika Mahasawat
- Programme in Biology and Applied Biology, Faculty of Science and Technology, Songkhla Rajabhat University, Songkhla, 90000, Thailand
| | - Teerayut Sriyatep
- Programme in Chemistry, Faculty of Science and Technology, Songkhla Rajabhat University, Songkhla, 90000, Thailand
| | - Wanida Petlamul
- College of Innovation and Management, Songkhla Rajabhat University, Songkhla, 90000, Thailand
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Wu Q, Li H, Wang S, Zhang Z, Zhang Z, Jin T, Hu X, Zeng G. Differential Expression of Genes Related to Growth and Aflatoxin Synthesis in Aspergillus flavus When Inhibited by Bacillus velezensis Strain B2. Foods 2022; 11:foods11223620. [PMID: 36429212 PMCID: PMC9689179 DOI: 10.3390/foods11223620] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2022] [Revised: 11/02/2022] [Accepted: 11/11/2022] [Indexed: 11/16/2022] Open
Abstract
Aspergillus flavus is a saprophytic soil fungus that infects and contaminates seed crops with the highly carcinogenic aflatoxin, which brings health hazards to animals and humans. In this study, bacterial strains B1 and B2 isolated from the rhizosphere soil of camellia sinensis had significant antagonistic activities against A. flavus. Based on the phylogenetic analysis of 16SrDNA gene sequence, bacterial strains B1 and B2 were identified as Bacillus tequilensis and Bacillus velezensis, respectively. In addition, the transcriptome analysis showed that some genes related to A. flavus growth and aflatoxin synthesis were differential expressed and 16 genes in the aflatoxin synthesis gene cluster showed down-regulation trends when inhibited by Bacillus velezensis strain B2. We guessed that the Bacillus velezensis strain B2 may secrete some secondary metabolites, which regulate the related gene transcription of A. flavus to inhibit growth and aflatoxin production. In summary, this work provided the foundation for the more effective biocontrol of A. flavus infection and aflatoxin contamination by the determination of differential expression of genes related to growth and aflatoxin synthesis in A. flavus when inhibited by B. velezensis strain B2.
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Affiliation(s)
| | | | | | | | | | | | | | - Guohong Zeng
- Correspondence: ; Tel.: +86-0571-86843195; Fax: +86-571-86843196
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20
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A novel investigated method for decoupling adsorption and degradation effect on AFB1 based on isotope tracing and NMR analysis. Food Chem 2022; 405:134978. [DOI: 10.1016/j.foodchem.2022.134978] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Revised: 11/09/2022] [Accepted: 11/14/2022] [Indexed: 11/18/2022]
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21
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Imade FN, Humza M, Dada OA, Ullah S, Jahan I, Eseigbe D, Geng H, Zheng Y, Xing F, Liu Y. Isolation and characterization of novel soil bacterium, Klebsiella pneumoniae strain GS7-1 for the degradation of zearalenone in major cereals. Food Control 2022. [DOI: 10.1016/j.foodcont.2022.109287] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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22
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Chen G, Fang Q, Liao Z, Xu C, Liang Z, Liu T, Zhong Q, Wang L, Fang X, Wang J. Detoxification of Aflatoxin B1 by a Potential Probiotic Bacillus amyloliquefaciens WF2020. Front Microbiol 2022; 13:891091. [PMID: 35620100 PMCID: PMC9127598 DOI: 10.3389/fmicb.2022.891091] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Accepted: 03/28/2022] [Indexed: 11/13/2022] Open
Abstract
Microbial degradation is considered as an attractive method to eliminate exposure to aflatoxin B1 (AFB1), the most toxic mycotoxin that causes great economic losses and brings a serious threat to human and animal health, in food and feed. In this study, Bacillus amyloliquefaciens WF2020, isolated from naturally fermented pickles, could effectively degrade AFB1 ranging from 1 to 8 μg/ml, and the optimum temperature and pH value were 37–45°C and 8.0, respectively. Moreover, B. amyloliquefaciens WF2020 was considered to be a potential probiotic due to the synthesis of active compounds, absence of virulence genes, susceptibility to various antibiotics, and enhanced lifespan of Caenorhabditis elegans. Extracellular enzymes or proteins played a major role in AFB1 degradation mediated by B. amyloliquefaciens WF2020 into metabolites with low or no mutagenicity and toxicity to C. elegans. AFB1 degradation by the cell-free supernatant was stable up to 70°C, with an optimal pH of 8.0, and the cell-free supernatant could still degrade AFB1 by 37.16% after boiling for 20 min. Furthermore, B. amyloliquefaciens WF2020 caused a slight defect in fungal growth and completely inhibited AFB1 production when co-incubated with Aspergillus flavus. Additionally, B. amyloliquefaciens WF2020 suppressed the expression of 10 aflatoxin pathway genes and 2 transcription factors (alfR and alfS), suggesting that B. amyloliquefaciens WF2020 might inhibit AFB1 synthesis in A. flavus. These results indicate that B. amyloliquefaciens WF2020 and/or its extracellular enzymes or proteins have a promising potential to be applied in protecting food and feed from AFB1 contamination.
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Affiliation(s)
- Guojun Chen
- Guangdong Provincial Key Laboratory of Food Quality and Safety, Guangdong Provincial Key Laboratory of Nutraceuticals and Functional Foods, College of Food Science, South China Agricultural University, Guangzhou, China
| | - Qian'an Fang
- Guangdong Provincial Key Laboratory of Food Quality and Safety, Guangdong Provincial Key Laboratory of Nutraceuticals and Functional Foods, College of Food Science, South China Agricultural University, Guangzhou, China
| | - Zhenlin Liao
- Guangdong Provincial Key Laboratory of Food Quality and Safety, Guangdong Provincial Key Laboratory of Nutraceuticals and Functional Foods, College of Food Science, South China Agricultural University, Guangzhou, China
| | - Chunwei Xu
- Guangdong Moyanghua Grains and Oils Co., Ltd., Yangjiang, China
| | - Zhibo Liang
- Guangdong Moyanghua Grains and Oils Co., Ltd., Yangjiang, China
| | - Tong Liu
- Guangdong Provincial Key Laboratory of Food Quality and Safety, Guangdong Provincial Key Laboratory of Nutraceuticals and Functional Foods, College of Food Science, South China Agricultural University, Guangzhou, China
| | - Qingping Zhong
- Guangdong Provincial Key Laboratory of Food Quality and Safety, Guangdong Provincial Key Laboratory of Nutraceuticals and Functional Foods, College of Food Science, South China Agricultural University, Guangzhou, China
| | - Li Wang
- Guangdong Provincial Key Laboratory of Food Quality and Safety, Guangdong Provincial Key Laboratory of Nutraceuticals and Functional Foods, College of Food Science, South China Agricultural University, Guangzhou, China
| | - Xiang Fang
- Guangdong Provincial Key Laboratory of Food Quality and Safety, Guangdong Provincial Key Laboratory of Nutraceuticals and Functional Foods, College of Food Science, South China Agricultural University, Guangzhou, China
| | - Jie Wang
- Guangdong Provincial Key Laboratory of Food Quality and Safety, Guangdong Provincial Key Laboratory of Nutraceuticals and Functional Foods, College of Food Science, South China Agricultural University, Guangzhou, China
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23
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Nahle S, El Khoury A, Savvaidis I, Chokr A, Louka N, Atoui A. Detoxification approaches of mycotoxins: by microorganisms, biofilms and enzymes. INTERNATIONAL JOURNAL OF FOOD CONTAMINATION 2022. [DOI: 10.1186/s40550-022-00089-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
AbstractMycotoxins are generally found in food, feed, dairy products, and beverages, subsequently presenting serious human and animal health problems. Not surprisingly, mycotoxin contamination has been a worldwide concern for many research studies. In this regard, many biological, chemical, and physical approaches were investigated to reduce and/or remove contamination from food and feed products. Biological detoxification processes seem to be the most promising approaches for mycotoxins removal from food. The current review details the newest progress in biological detoxification (adsorption and metabolization) through microorganisms, their biofilms, and enzymatic degradation, finally describing the detoxification mechanism of many mycotoxins by some microorganisms. This review also reports the possible usage of microorganisms as mycotoxins’ binders in various food commodities, which may help produce mycotoxins-free food and feed.
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Xiong D, Wen J, Lu G, Li T, Long M. Isolation, Purification, and Characterization of a Laccase-Degrading Aflatoxin B1 from Bacillus amyloliquefaciens B10. Toxins (Basel) 2022; 14:toxins14040250. [PMID: 35448859 PMCID: PMC9028405 DOI: 10.3390/toxins14040250] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Revised: 03/29/2022] [Accepted: 03/29/2022] [Indexed: 01/27/2023] Open
Abstract
Aflatoxins, widely found in feed and foodstuffs, are potentially harmful to human and animal health because of their high toxicity. In this study, a strain of Bacillus amyloliquefaciens B10 with a strong ability to degrade aflatoxin B1 (AFB1) was screened; it could degrade 2.5 μg/mL of AFB1 within 96 h. The active substances of Bacillus amyloliquefaciens B10 for the degradation of AFB1 mainly existed in the culture supernatant. A new laccase with AFB1-degrading activity was separated by ammonium sulfate precipitation, diethylaminoethyl (DEAE) and gel filtration chromatography. The results of molecular docking showed that B10 laccase and aflatoxin had a high docking score. The coding sequence of the laccase was successfully amplified from cDNA by PCR and cloned into E. coli. The purified laccase could degrade 79.3% of AFB1 within 36 h. The optimum temperature for AFB1 degradation was 40 °C, and the optimum pH was 6.0–8.0. Notably, Mg2+ and dimethyl sulfoxide (DMSO) could enhance the AFB1-degrading activity of B10 laccase. Mutation of the three key metal combined sites of B10 laccase resulted in the loss of AFB1-degrading activity, indicating that these three metal combined sites of B10 laccase play an essential role in the catalytic degradation of AFB1.
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25
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He Q, Liang J, Zhao Y, Yuan Y, Wang Z, Gao Z, Wei J, Yue T. Enzymatic degradation of mycotoxin patulin by an extracellular lipase from Ralstonia and its application in apple juice. Food Control 2022. [DOI: 10.1016/j.foodcont.2022.108870] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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Liu M, Zhao L, Gong G, Zhang L, Shi L, Dai J, Han Y, Wu Y, Khalil MM, Sun L. Invited review: Remediation strategies for mycotoxin control in feed. J Anim Sci Biotechnol 2022; 13:19. [PMID: 35090579 PMCID: PMC8796454 DOI: 10.1186/s40104-021-00661-4] [Citation(s) in RCA: 63] [Impact Index Per Article: 31.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Accepted: 11/29/2021] [Indexed: 12/31/2022] Open
Abstract
Mycotoxins are secondary metabolites of different species of fungi. Aflatoxin B1 (AFB1), deoxynivalenol (DON), zearalenone (ZEN) and fumonisin B1 (FB1) are the main mycotoxins contaminating animal feedstuffs. These mycotoxins can primarily induce hepatotoxicity, immunotoxicity, neurotoxicity and nephrotoxicity, consequently cause adverse effects on the health and performance of animals. Therefore, physical, chemical, biological and nutritional regulation approaches have been developed as primary strategies for the decontamination and detoxification of these mycotoxins in the feed industry. Meanwhile, each of these techniques has its drawbacks, including inefficient, costly, or impractically applied on large scale. This review summarized the advantages and disadvantages of the different remediation strategies, as well as updates of the research progress of these strategies for AFB1, DON, ZEN and FB1 control in the feed industry.
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Affiliation(s)
- Meng Liu
- Hubei Hongshan Laboratory, College of Animal Science and Technology, Huazhong Agricultural University, Wuhan, 430070, Hubei, China
| | - Ling Zhao
- Hubei Hongshan Laboratory, College of Animal Science and Technology, Huazhong Agricultural University, Wuhan, 430070, Hubei, China
| | - Guoxin Gong
- Hubei Hongshan Laboratory, College of Animal Science and Technology, Huazhong Agricultural University, Wuhan, 430070, Hubei, China
| | - Lei Zhang
- Hubei Hongshan Laboratory, College of Animal Science and Technology, Huazhong Agricultural University, Wuhan, 430070, Hubei, China
| | - Lei Shi
- Hubei Hongshan Laboratory, College of Animal Science and Technology, Huazhong Agricultural University, Wuhan, 430070, Hubei, China
| | - Jiefan Dai
- Department of Agriculture of Sichuan Province, Chengdu, 610041, China
| | - Yanming Han
- Trouw Nutrition, Amersfoort, The Netherlands
| | - Yuanyuan Wu
- Trouw Nutrition, Amersfoort, The Netherlands
| | - Mahmoud Mohamed Khalil
- Animal Production Department, Faculty of Agriculture, Benha University, Banha, 13736, Egypt
| | - Lvhui Sun
- Hubei Hongshan Laboratory, College of Animal Science and Technology, Huazhong Agricultural University, Wuhan, 430070, Hubei, China.
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Kumar V, Bahuguna A, Ramalingam S, Dhakal G, Shim JJ, Kim M. Recent technological advances in mechanism, toxicity, and food perspectives of enzyme-mediated aflatoxin degradation. Crit Rev Food Sci Nutr 2021; 62:5395-5412. [PMID: 34955062 DOI: 10.1080/10408398.2021.2010647] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Aflatoxins are carcinogenic secondary metabolites produced by Aspergillus section Flavi that contaminates a wide variety of food and feed products and is responsible for serious health and economic consequences. Fermented foods are prepared with a wide variety of substrates over a long fermentation time and are thus vulnerable to contamination by aflatoxin-producing fungi, leading to the production of aflatoxin B1. The mitigation and control of aflatoxin is currently a prime focus for developing safe aflatoxin-free food. This review summarizes the role of major aflatoxin-degrading enzymes such as laccase, peroxidase, and lactonase, and microorganisms in the context of their application in food. A putative mechanism of enzyme-mediated aflatoxin degradation and toxicity evaluation of the degraded products are also extensively discussed to evaluate the safety of degradation processes for food applications. The review also describes aflatoxin-degrading microorganisms isolated from fermented products and investigates their applicability in food as aflatoxin preventing agents. Furthermore, a summary of recent technological advancements in protein engineering, nanozymes, in silico and statistical optimization approaches are explored to improve the industrial applicability of aflatoxin-degrading enzymes.
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Affiliation(s)
- Vishal Kumar
- Department of Food Science and Technology, Yeungnam University, Gyeongsan, Gyeongsangbuk-do, Republic of Korea
| | - Ashutosh Bahuguna
- Department of Food Science and Technology, Yeungnam University, Gyeongsan, Gyeongsangbuk-do, Republic of Korea
| | - Srinivasan Ramalingam
- Department of Food Science and Technology, Yeungnam University, Gyeongsan, Gyeongsangbuk-do, Republic of Korea
| | - Ganesh Dhakal
- School of Chemical Engineering, Yeungnam University, Gyeongsan, Gyeongsangbuk-do, Republic of Korea
| | - Jae-Jin Shim
- School of Chemical Engineering, Yeungnam University, Gyeongsan, Gyeongsangbuk-do, Republic of Korea
| | - Myunghee Kim
- Department of Food Science and Technology, Yeungnam University, Gyeongsan, Gyeongsangbuk-do, Republic of Korea
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28
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Piotrowska M. Microbiological Decontamination of Mycotoxins: Opportunities and Limitations. Toxins (Basel) 2021; 13:toxins13110819. [PMID: 34822603 PMCID: PMC8619243 DOI: 10.3390/toxins13110819] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Revised: 11/12/2021] [Accepted: 11/18/2021] [Indexed: 02/07/2023] Open
Abstract
The contamination of food and feeds with mycotoxins poses a global health risk to humans and animals, with major economic consequences. Good agricultural and manufacturing practices can help control mycotoxin contamination. Since these actions are not always effective, several methods of decontamination have also been developed, including physical, chemical, and biological methods. Biological decontamination using microorganisms has revealed new opportunities. However, these biological methods require legal regulations and more research before they can be used in food production. Currently, only selected biological methods are acceptable for the decontamination of feed. This review discusses the literature on the use of microorganisms to remove mycotoxins and presents their possible mechanisms of action. Special attention is given to Saccharomyces cerevisiae yeast and lactic acid bacteria, and the use of yeast cell wall derivatives.
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Affiliation(s)
- Małgorzata Piotrowska
- Faculty of Biotechnology and Food Sciences, Institute of Fermentation Technology and Microbiology, Lodz University of Technology, Wólczańska 171/173, 90-530 Lodz, Poland
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29
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Oonaka K, Kobayashi N, Uchiyama Y, Honda M, Miyake S, Sugita-Konishi Y. [In vivo and In vitro Mitigation Effects of Lactic Acid Bacteria Derived from Fresh Vegetables on Aflatoxins]. Food Hygiene and Safety Science (Shokuhin Eiseigaku Zasshi) 2021; 62:148-156. [PMID: 34732640 DOI: 10.3358/shokueishi.62.148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Aflatoxins (AFs) are known to be oncogenic mycotoxins. This study investigated the mitigation effects of lactic acid bacteria (LAB) isolated from four types of vegetable, cucumber, Chinese cabbage, Japanese radish and eggplant, which are used to make Japanese traditional fermented pickles, on AFs. Using aflatoxin M1 (AFM1) binding assay for screening, four representative strains were selected (one from each vegetable) from total 94 LAB strains, based on the highest binding ratio. The ranges of the binding ratio of these representative strains to aflatoxin B1 (AFB1), aflatoxin B2, aflatoxin G1, aflatoxin G2 and AFM1 were 57.5%-87.9% for the LAB strain derived from cucumber, 18.9%-43.9% for the LAB strain derived from Chinese cabbage, 26.4%-41.7% for the LAB strain derived from Japanese radish, and 15.0%-42.6% for the LAB strain derived from eggplant. The strains isolated from cucumber, Chinese cabbage, Japanese radish and eggplant were identified as Lactococcus lactis subsp. lactis, Weissella cibaria, Leuconostoc mesenteroides and Leu. mesenteroides, respectively. An in vitro binding assay of the four strains under acidic conditions showed that the number of living bacteria decreased, while the binding ratio increased in some strains, suggesting that the LAB maintained their capacity to bind aflatoxins even in an environment that imitated the stomach. An in vivo experiment using L. lactis subsp. lactis derived from cucumber revealed that the bacteria significantly inhibited the absorption of AFB1 into blood. These results showed that the LAB used for Japanese vegetable pickles was an effective binding agent of AFs and suggested that they might play a role in mitigating AF absorption.
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Affiliation(s)
- Kenji Oonaka
- Department of Food and Life Science, Azabu University
| | - Naoki Kobayashi
- Department of Food and Life Science, Azabu University.,Graduate School of Environmental Health, Azabu University
| | | | - Mioko Honda
- Department of Animal Nursing Science, Yamazaki University of Animal Health Technology
| | - Shiro Miyake
- Department of Food and Life Science, Azabu University.,Graduate School of Environmental Health, Azabu University
| | - Yoshiko Sugita-Konishi
- Department of Food and Life Science, Azabu University.,Graduate School of Environmental Health, Azabu University
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30
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Yao Y, Shu X, Wang D, Kan W, Su P, Hu H, Chen X, Wang D, Huang S, Wu L. Non-enzymatic Transformation of Aflatoxin B 1 by Pseudomonas geniculata m29. Front Microbiol 2021; 12:724103. [PMID: 34447365 PMCID: PMC8383447 DOI: 10.3389/fmicb.2021.724103] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2021] [Accepted: 07/12/2021] [Indexed: 11/25/2022] Open
Abstract
Aflatoxin B1 (AFB1) is the most harmful mycotoxin produced by filamentous fungi and presents a serious threat to human and animal health. Therefore, it is essential to protect humans and animals from AFB1-induced acute and chronic toxicity. In this study, Pseudomonas strain m29 having a high efficiency of AFB1 transformation was isolated from soil. The transformation ratio by m29 was more than 97% within 24 h, and the optimum temperature for transformation was 37°C. Moreover, the AFB1 transforming activity was mainly attributed to the cell-free supernatant of strain m29. The metabolite that plays a crucial role in AFB1 transformation is likely 1,2-dimethylhydrazine or 1,1-dimethylhydrazine, as identified by GC-MS and LC-MS analysis. AFB1 was transformed into a product with molecular formula C17H14O7. To the best of our knowledge, this is the first study of non-enzymatic AFB1 transformation by bacteria. Importantly, this AFB1 transformation mechanism could be universal to various microorganisms.
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Affiliation(s)
- Yuanyuan Yao
- Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China.,School of Life Sciences, University of Science and Technology of China, Hefei, China
| | - Xian Shu
- Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China.,School of Life Sciences, University of Science and Technology of China, Hefei, China
| | - Dongdong Wang
- Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China
| | - Wenjie Kan
- Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China
| | - Pengfei Su
- Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China
| | - Hao Hu
- Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China
| | - Xu Chen
- Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China
| | - Dacheng Wang
- Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China
| | - Shengwei Huang
- Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China
| | - Lifang Wu
- Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China.,School of Life Sciences, University of Science and Technology of China, Hefei, China
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31
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Aflatoxin contamination in food crops: causes, detection, and management: a review. FOOD PRODUCTION, PROCESSING AND NUTRITION 2021. [DOI: 10.1186/s43014-021-00064-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
AbstractMycotoxins are secondary metabolites produced by several fungal species and molds. Under favorable conditions like high temperature and moisture, they contaminate a large number of food commodities and regional crops during pre and post-harvesting. Aflatoxin is the main mycotoxin that harm animal and human health due to its carcinogenic nature. Aflatoxins are mainly released by Aspergillus flavus and Aspergillus parasiticus. AFB1 constitutes the most harmful type of aflatoxins and is a potent hepato-carcinogenic, mutagenic, teratogenic and it suppresses the immune system. To maintain food safety and to prevent aflatoxin contamination in food crops, combined approaches of using resistant varieties along with recommended farming practices should be followed. This review concentrates on various aspects of mycotoxin contamination in crops and recent methods to prevent or minimize the contamination.
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32
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Potential of Bacillus velezensis as a probiotic in animal feed: a review. J Microbiol 2021; 59:627-633. [PMID: 34212287 DOI: 10.1007/s12275-021-1161-1] [Citation(s) in RCA: 38] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Revised: 06/11/2021] [Accepted: 06/15/2021] [Indexed: 12/17/2022]
Abstract
Bacillus velezensis is a plant growth-promoting bacterium that can also inhibit plant pathogens. However, based on its properties, it is emerging as a probiotic in animal feed. This review focuses on the potential characteristics of B. velezensis for use as a probiotic in the animal feed industry. The review was conducted by collecting recently published articles from peer-reviewed journals. Google Scholar and PubMed were used as search engines to access published literature. Based on the information obtained, the data were divided into three groups to discuss the (i) probiotic characteristics of B. velezensis, (ii) probiotic potential for fish, and (iii) the future potential of this species to be developed as a probiotic for the animal feed industry. Different strains of B. velezensis isolated from different sources were found to have the ability to produce antimicrobial compounds and have a beneficial effect on the gut microbiota, with the potential to be a candidate probiotic in the animal feed industry. This review provides valuable information about the characteristics of B. velezensis, which can provide researchers with a better understanding of the use of this species in the animal feed industry.
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34
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Guan Y, Chen J, Nepovimova E, Long M, Wu W, Kuca K. Aflatoxin Detoxification Using Microorganisms and Enzymes. Toxins (Basel) 2021; 13:toxins13010046. [PMID: 33435382 PMCID: PMC7827145 DOI: 10.3390/toxins13010046] [Citation(s) in RCA: 45] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2020] [Revised: 01/05/2021] [Accepted: 01/06/2021] [Indexed: 12/12/2022] Open
Abstract
Mycotoxin contamination causes significant economic loss to food and feed industries and seriously threatens human health. Aflatoxins (AFs) are one of the most harmful mycotoxins, which are produced by Aspergillus flavus, Aspergillus parasiticus, and other fungi that are commonly found in the production and preservation of grain and feed. AFs can cause harm to animal and human health due to their toxic (carcinogenic, teratogenic, and mutagenic) effects. How to remove AF has become a major problem: biological methods cause no contamination, have high specificity, and work at high temperature, affording environmental protection. In the present research, microorganisms with detoxification effects researched in recent years are reviewed, the detoxification mechanism of microbes on AFs, the safety of degrading enzymes and reaction products formed in the degradation process, and the application of microorganisms as detoxification strategies for AFs were investigated. One of the main aims of the work is to provide a reliable reference strategy for biological detoxification of AFs.
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Affiliation(s)
- Yun Guan
- Key Laboratory of Zoonosis of Liaoning Province, College of Animal Science & Veterinary Medicine, Shenyang Agricultural University, Shenyang 110866, China; (Y.G.); (J.C.)
| | - Jia Chen
- Key Laboratory of Zoonosis of Liaoning Province, College of Animal Science & Veterinary Medicine, Shenyang Agricultural University, Shenyang 110866, China; (Y.G.); (J.C.)
| | - Eugenie Nepovimova
- Department of Chemistry, Faculty of Science, University of Hradec Kralove, 50003 Hradec Kralove, Czech Republic;
| | - Miao Long
- Key Laboratory of Zoonosis of Liaoning Province, College of Animal Science & Veterinary Medicine, Shenyang Agricultural University, Shenyang 110866, China; (Y.G.); (J.C.)
- Correspondence: (M.L.); (W.W.); (K.K.)
| | - Wenda Wu
- Department of Chemistry, Faculty of Science, University of Hradec Kralove, 50003 Hradec Kralove, Czech Republic;
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
- Correspondence: (M.L.); (W.W.); (K.K.)
| | - Kamil Kuca
- Department of Chemistry, Faculty of Science, University of Hradec Kralove, 50003 Hradec Kralove, Czech Republic;
- Correspondence: (M.L.); (W.W.); (K.K.)
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35
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Fang Q, Du M, Chen J, Liu T, Zheng Y, Liao Z, Zhong Q, Wang L, Fang X, Wang J. Degradation and Detoxification of Aflatoxin B1 by Tea-Derived Aspergillus niger RAF106. Toxins (Basel) 2020; 12:toxins12120777. [PMID: 33291337 PMCID: PMC7762301 DOI: 10.3390/toxins12120777] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2020] [Accepted: 12/02/2020] [Indexed: 11/16/2022] Open
Abstract
Microbial degradation is an effective and attractive method for eliminating aflatoxin B1 (AFB1), which is severely toxic to humans and animals. In this study, Aspergillus niger RAF106 could effectively degrade AFB1 when cultivated in Sabouraud dextrose broth (SDB) with contents of AFB1 ranging from 0.1 to 4 μg/mL. Treatment with yeast extract as a nitrogen source stimulated the degradation, but treatment with NaNO3 and NaNO2 as nitrogen sources and lactose and sucrose as carbon sources suppressed the degradation. Moreover, A. niger RAF106 still degraded AFB1 at initial pH values that ranged from 4 to 10 and at cultivation temperatures that ranged from 25 to 45 °C. In addition, intracellular enzymes or proteins with excellent thermotolerance were verified as being able to degrade AFB1 into metabolites with low or no mutagenicity. Furthermore, genomic sequence analysis indicated that the fungus was considered to be safe owing to the absence of virulence genes and the gene clusters for the synthesis of mycotoxins. These results indicate that A. niger RAF106 and its intracellular enzymes or proteins have a promising potential to be applied commercially in the processing and industry of food and feed to detoxify AFB1.
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Affiliation(s)
- Qian’an Fang
- Guangdong Provincial Key Laboratory of Food Quality and Safety, College of Food Science, South China Agricultural University, Guangzhou 510642, China; (Q.F.); (M.D.); (J.C.); (T.L.); (Y.Z.); (Z.L.); (Q.Z.); (L.W.)
| | - Minru Du
- Guangdong Provincial Key Laboratory of Food Quality and Safety, College of Food Science, South China Agricultural University, Guangzhou 510642, China; (Q.F.); (M.D.); (J.C.); (T.L.); (Y.Z.); (Z.L.); (Q.Z.); (L.W.)
| | - Jianwen Chen
- Guangdong Provincial Key Laboratory of Food Quality and Safety, College of Food Science, South China Agricultural University, Guangzhou 510642, China; (Q.F.); (M.D.); (J.C.); (T.L.); (Y.Z.); (Z.L.); (Q.Z.); (L.W.)
| | - Tong Liu
- Guangdong Provincial Key Laboratory of Food Quality and Safety, College of Food Science, South China Agricultural University, Guangzhou 510642, China; (Q.F.); (M.D.); (J.C.); (T.L.); (Y.Z.); (Z.L.); (Q.Z.); (L.W.)
| | - Yong Zheng
- Guangdong Provincial Key Laboratory of Food Quality and Safety, College of Food Science, South China Agricultural University, Guangzhou 510642, China; (Q.F.); (M.D.); (J.C.); (T.L.); (Y.Z.); (Z.L.); (Q.Z.); (L.W.)
| | - Zhenlin Liao
- Guangdong Provincial Key Laboratory of Food Quality and Safety, College of Food Science, South China Agricultural University, Guangzhou 510642, China; (Q.F.); (M.D.); (J.C.); (T.L.); (Y.Z.); (Z.L.); (Q.Z.); (L.W.)
- Lingnan Guangdong Laboratory of Modern Agriculture, Guangzhou 510642, China
| | - Qingping Zhong
- Guangdong Provincial Key Laboratory of Food Quality and Safety, College of Food Science, South China Agricultural University, Guangzhou 510642, China; (Q.F.); (M.D.); (J.C.); (T.L.); (Y.Z.); (Z.L.); (Q.Z.); (L.W.)
- Lingnan Guangdong Laboratory of Modern Agriculture, Guangzhou 510642, China
| | - Li Wang
- Guangdong Provincial Key Laboratory of Food Quality and Safety, College of Food Science, South China Agricultural University, Guangzhou 510642, China; (Q.F.); (M.D.); (J.C.); (T.L.); (Y.Z.); (Z.L.); (Q.Z.); (L.W.)
- Lingnan Guangdong Laboratory of Modern Agriculture, Guangzhou 510642, China
| | - Xiang Fang
- Guangdong Provincial Key Laboratory of Food Quality and Safety, College of Food Science, South China Agricultural University, Guangzhou 510642, China; (Q.F.); (M.D.); (J.C.); (T.L.); (Y.Z.); (Z.L.); (Q.Z.); (L.W.)
- Lingnan Guangdong Laboratory of Modern Agriculture, Guangzhou 510642, China
- Correspondence: (X.F.); (J.W.)
| | - Jie Wang
- Guangdong Provincial Key Laboratory of Food Quality and Safety, College of Food Science, South China Agricultural University, Guangzhou 510642, China; (Q.F.); (M.D.); (J.C.); (T.L.); (Y.Z.); (Z.L.); (Q.Z.); (L.W.)
- Lingnan Guangdong Laboratory of Modern Agriculture, Guangzhou 510642, China
- Guangdong Open Laboratory of Applied Microbiology, Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, State Key Laboratory of Applied Microbiology Southern China, Guangdong Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou 510070, China
- Correspondence: (X.F.); (J.W.)
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Guo Y, Zhao L, Ma Q, Ji C. Novel strategies for degradation of aflatoxins in food and feed: A review. Food Res Int 2020; 140:109878. [PMID: 33648196 DOI: 10.1016/j.foodres.2020.109878] [Citation(s) in RCA: 54] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2020] [Revised: 10/31/2020] [Accepted: 11/01/2020] [Indexed: 02/06/2023]
Abstract
Aflatoxins are toxic secondary metabolites mainly produced by Aspergillus fungi, posing high carcinogenic potency in humans and animals. Dietary exposure to aflatoxins is a global problem in both developed and developing countries especially where there is poor regulation of their levels in food and feed. Thus, academics have been striving over the decades to develop effective strategies for degrading aflatoxins in food and feed. These strategies are technologically diverse and based on physical, chemical, or biological principles. This review summarizes the recent progress on novel aflatoxin degradation strategies including irradiation, cold plasma, ozone, electrolyzed oxidizing water, organic acids, natural plant extracts, microorganisms and enzymes. A clear understanding of the detoxification efficiency, mechanism of action, degradation products, application potential and current limitations of these methods is presented. In addition, the development and future perspective of nanozymes in aflatoxins degradation are introduced.
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Affiliation(s)
- Yongpeng Guo
- State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing 100193, PR China.
| | - Lihong Zhao
- State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing 100193, PR China.
| | - Qiugang Ma
- State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing 100193, PR China.
| | - Cheng Ji
- State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing 100193, PR China.
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Ye M, Wei C, Khalid A, Hu Q, Yang R, Dai B, Cheng H, Wang Z. Effect of Bacillus velezensis to substitute in-feed antibiotics on the production, blood biochemistry and egg quality indices of laying hens. BMC Vet Res 2020; 16:400. [PMID: 33097070 PMCID: PMC7583257 DOI: 10.1186/s12917-020-02570-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Accepted: 09/11/2020] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND The excessive use of antibiotics in the livestock feed industry caused inevitable side effects of microbial resistance. Besides this residual antibiotics in animal-derived foodstuff imposed serious health problems for humans. So this study aimed to investigate the potential use of Bacillus velezensis to substitute antibiotics for poultry production. A total of 468, 49-week-old Hy-Line Brown chickens, were randomly divided into four groups the control group (regular diet), experiment group I (0.1% B. veleznesis), experiment group II (0.2% B. veleznesis), and antibiotic group (50 mg/kg flavomycin), with three replicates per group and trial period consisted on 42 days. RESULTS The results showed that, compared with the control group, the average egg production rate and daily feed intake of experimental groups I and II increased significantly (P < 0.05), while the average egg weight was increased in experimental group II as compared to (I) (P < 0.01). The feed conversion ratio was decreased (P > 0.05) in group (II) Egg quality parameters such as yolk weight of the experimental group II was increased, but that of the antibiotic group and experiment group I was decreased, neither significant (P > 0.05). Moreover, the eggshell strength, yolk color, albumen height, and Haugh unit were significantly increased (P < 0.05). Compared with the control group, probiotic groups can increase the progesterone and motilin (P > 0.05) but decrease the secretin and cholecystokinin in the blood plasma (P > 0.05). CONCLUSIONS This study suggested that B. velezensis can substitute in-feed-antibiotics and improved most of the study parameters significantly. Which suggested that B. velezensis has potential future application value to replace the feed antibiotics.
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Affiliation(s)
- Miao Ye
- College of Life Science, Anhui Agricultural University, No. 130, Changjiang Road, Anhui, 230036, Hefei, The People's Republic of China
| | - Chunjie Wei
- College of Life Science, Anhui Agricultural University, No. 130, Changjiang Road, Anhui, 230036, Hefei, The People's Republic of China
| | - Anam Khalid
- College of Life Science, Anhui Agricultural University, No. 130, Changjiang Road, Anhui, 230036, Hefei, The People's Republic of China
| | - Qian Hu
- College of Life Science, Anhui Agricultural University, No. 130, Changjiang Road, Anhui, 230036, Hefei, The People's Republic of China
| | - Ru Yang
- College of Life Science, Anhui Agricultural University, No. 130, Changjiang Road, Anhui, 230036, Hefei, The People's Republic of China
| | - Binghong Dai
- College of Life Science, Anhui Agricultural University, No. 130, Changjiang Road, Anhui, 230036, Hefei, The People's Republic of China
| | - Hengwei Cheng
- Department of Animal Science, Purdue University, 270 S, Russell ST, IN, 47907, West Lafayette, USA
| | - Zaigui Wang
- College of Life Science, Anhui Agricultural University, No. 130, Changjiang Road, Anhui, 230036, Hefei, The People's Republic of China.
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Yang K, Geng Q, Song F, He X, Hu T, Wang S, Tian J. Transcriptome Sequencing Revealed an Inhibitory Mechanism of Aspergillus flavus Asexual Development and Aflatoxin Metabolism by Soy-Fermenting Non-Aflatoxigenic Aspergillus. Int J Mol Sci 2020; 21:E6994. [PMID: 32977505 PMCID: PMC7583960 DOI: 10.3390/ijms21196994] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Revised: 09/12/2020] [Accepted: 09/17/2020] [Indexed: 11/16/2022] Open
Abstract
Aflatoxins (AFs) have always been regarded as the most effective carcinogens, posing a great threat to agriculture, food safety, and human health. Aspergillus flavus is the major producer of aflatoxin contamination in crops. The prevention and control of A. flavus and aflatoxin continues to be a global problem. In this study, we demonstrated that the cell-free culture filtrate of Aspergillus oryzae and a non-aflatoxigenic A. flavus can effectively inhibit the production of AFB1 and the growth and reproduction of A. flavus, indicating that both of the non-aflatoxigenic Aspergillus strains secrete inhibitory compounds. Further transcriptome sequencing was performed to analyze the inhibitory mechanism of A. flavus treated with fermenting cultures, and the results revealed that genes involved in the AF biosynthesis pathway and other biosynthetic gene clusters were significantly downregulated, which might be caused by the reduced expression of specific regulators, such as AflS, FarB, and MtfA. The WGCNA results further revealed that genes involved in the TCA cycle and glycolysis were potentially involved in aflatoxin biosynthesis. Our comparative transcriptomics also revealed that two conidia transcriptional factors, brlA and abaA, were found to be significantly downregulated, which might lead to the downregulation of conidiation-specific genes, such as the conidial hydrophobins genes rodA and rodB. In summary, our research provides new insights for the molecular mechanism of controlling AF synthesis to control the proliferation of A. flavus and AF pollution.
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Affiliation(s)
- Kunlong Yang
- School of Life Science, Jiangsu Normal University, Xuzhou 221116, China; (K.Y.); (Q.G.); (F.S.); (X.H.)
- Key Laboratory of Pathogenic Fungi and Mycotoxins of Fujian Province, School of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China;
| | - Qingru Geng
- School of Life Science, Jiangsu Normal University, Xuzhou 221116, China; (K.Y.); (Q.G.); (F.S.); (X.H.)
| | - Fengqin Song
- School of Life Science, Jiangsu Normal University, Xuzhou 221116, China; (K.Y.); (Q.G.); (F.S.); (X.H.)
| | - Xiaona He
- School of Life Science, Jiangsu Normal University, Xuzhou 221116, China; (K.Y.); (Q.G.); (F.S.); (X.H.)
| | - Tianran Hu
- Key Laboratory of Pathogenic Fungi and Mycotoxins of Fujian Province, School of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China;
| | - Shihua Wang
- Key Laboratory of Pathogenic Fungi and Mycotoxins of Fujian Province, School of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China;
| | - Jun Tian
- School of Life Science, Jiangsu Normal University, Xuzhou 221116, China; (K.Y.); (Q.G.); (F.S.); (X.H.)
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Sun Z, Huang D, Duan X, Hong W, Liang J. Functionalized nanoflower-like hydroxyl magnesium silicate for effective adsorption of aflatoxin B1. JOURNAL OF HAZARDOUS MATERIALS 2020; 387:121792. [PMID: 31818670 DOI: 10.1016/j.jhazmat.2019.121792] [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: 09/20/2019] [Revised: 11/29/2019] [Accepted: 11/29/2019] [Indexed: 05/16/2023]
Abstract
Aflatoxin B1 (AFB1), which is widely found in food and feed, poses a serious threat to the health of human and livestock. In this work, functionalized nanoflower-like hydroxyl magnesium silicate (FNHMS) was synthesized for adsorption of AFB1. First, bulk magnesium silicate (MS) was converted into nanoflower-like hydroxyl magnesium silicate (NHMS) by hydroxylation. Cetyltrimethylammonium bromide (CTMAB) modification then enhanced the hydrophobicity and the affinity to AFB1 of NHMS. The adsorption performance for AFB1 followed the order of MS < NHMS < FNHMS, and the adsorption performance increased with the increase of the dose of CTMAB. Isothermal adsorption analysis indicated that the surface of FNHMS was heterogeneous. The adsorption capacity of FNHMS-0.4 to AFB1 was estimated to be 27.34 mg g-1 and 28.61 mg g-1 by Freundlich and Dubinin-Radushkevich isotherm adsorption model, respectively. By analyzing the adsorption kinetics and adsorption thermodynamics, both physical adsorption and chemisorption existed in the process of AFB1 being adsorbed on FNHMS-0.4. Adsorption mechanisms analysis indicated that the adsorption followed the adsorption site priority of H > O > Mg. This work demonstrates that FNHMS could be a promising adsorbent for removal of AFB1.
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Affiliation(s)
- Zhiwei Sun
- Key Laboratory of Special Functional Materials for Ecological Environment and Information (Hebei University of Technology), Ministry of Education, Tianjin 300130, People's Republic of China; Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education (Shandong University), Jinan 250061, People's Republic of China
| | - Di Huang
- Key Laboratory of Special Functional Materials for Ecological Environment and Information (Hebei University of Technology), Ministry of Education, Tianjin 300130, People's Republic of China
| | - Xinhui Duan
- Key Laboratory of Special Functional Materials for Ecological Environment and Information (Hebei University of Technology), Ministry of Education, Tianjin 300130, People's Republic of China
| | - Wei Hong
- Key Laboratory of Special Functional Materials for Ecological Environment and Information (Hebei University of Technology), Ministry of Education, Tianjin 300130, People's Republic of China
| | - Jinsheng Liang
- Key Laboratory of Special Functional Materials for Ecological Environment and Information (Hebei University of Technology), Ministry of Education, Tianjin 300130, People's Republic of China.
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Aflatoxin B 1 degradation by microorganisms isolated from Kombucha culture. Toxicon 2020; 179:76-83. [PMID: 32345454 DOI: 10.1016/j.toxicon.2020.03.004] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Revised: 03/07/2020] [Accepted: 03/10/2020] [Indexed: 12/13/2022]
Abstract
Aflatoxin B1 (AFB1) is the most harmful mycotoxin. Aflatoxin occurrence in tea makes this beverage unsuitable for consumption and presented risks to human health. Therefore, researches in aflatoxin microbial degradation are necessary to overcome this problem. Kombucha beverage is associated with health promoting effects. Thus, novel strains (Lactic acid bacteria and yeasts) were isolated from a Kombucha culture and assessed for AFB1 degradation in the liquid medium (Man Rogosa and Sharpe broth, yeast extract peptone dextrose broth and black tea). The main strains involved in AFB1 decontamination were identified based on DNA sequencing and the toxicity of the new products was evaluated on Hep2 cells and on Brine shrimp (Artemia salina). Our results showed that after 7 days of fermentation, kombucha was able to degrade 97% of AFB1 in black tea. Moreover, the effective yeasts present in Kombucha were identified as Pichia occidentalis, Candida sorboxylosa and Hanseniaspora opuntiae and the highest AFB1 degradation capacity was accorded to P. occidentalis (59%) when cultivated in black tea. Data on cytotoxicity tests on Hep2 cells and Brine shrimp (Artemia salina) showed that the biodegraded products were less toxic than pure AFB1. These findings suggest that, kombucha isolated strains could be potential candidates for application in the food and feed industry with a potential aflatoxin B1 detoxification properties.
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Tumukunde E, Ma G, Li D, Yuan J, Qin L, Wang S. Current research and prevention of aflatoxins in China. WORLD MYCOTOXIN J 2020. [DOI: 10.3920/wmj2019.2503] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Since their discovery in the 1960s, aflatoxins were found to have a considerable impact on the health of humans and animals as well as the country’s economy and international trade. Aflatoxins are often found in nuts, cereals and animal feeds, which has a significant danger to the food industry. Over the years, several steps have been undertaken worldwide to minimise their contamination in crops and their exposure to humans and animals. China is one of the largest exporters and importers of food and animal feed. As a result, many studies have been carried out in China related to aflatoxins, including their distribution, pollution, detection methods, monitoring, testing and managing. Chinese scientists studied aflatoxins in microbiological, toxicological, ecological effects as well as policies relating to their controlling. China has thus put into practice a number of strategies aiming at the prevention and control of aflatoxins in order to protect consumers and ensure a safe trade of food and feed, and the status and enlargement of these strategies are very important and useful for many consumers and stakeholders in China. Therefore, this article aims at the detriment assessments, regulations, distribution, detection methods, prevention and control of aflatoxins in China. It equally provides useful information about the recent safety management systems in place to fight the contamination of aflatoxins in food and feed in China.
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Affiliation(s)
- E. Tumukunde
- Key Laboratory of Pathogenic Fungi and Mycotoxins of Fujian Province and School of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China P.R
| | - G. Ma
- Key Laboratory of Pathogenic Fungi and Mycotoxins of Fujian Province and School of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China P.R
| | - D. Li
- Key Laboratory of Pathogenic Fungi and Mycotoxins of Fujian Province and School of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China P.R
| | - J. Yuan
- Key Laboratory of Pathogenic Fungi and Mycotoxins of Fujian Province and School of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China P.R
| | - L. Qin
- Key Laboratory of Pathogenic Fungi and Mycotoxins of Fujian Province and School of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China P.R
| | - S. Wang
- Key Laboratory of Pathogenic Fungi and Mycotoxins of Fujian Province and School of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China P.R
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Lu Y, Yang L, Yang G, Chi Y, Sun Q, He Q. Insight into the Fermentation of Chinese Horse Bean-chili-paste. FOOD REVIEWS INTERNATIONAL 2020. [DOI: 10.1080/87559129.2020.1717525] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Yunhao Lu
- College of Biomass Science and Engineering, Sichuan University, Chengdu, P. R. China
| | - Linzi Yang
- College of Biomass Science and Engineering, Sichuan University, Chengdu, P. R. China
| | - Guohua Yang
- Sichuan Dandan Pixian-douban Co.; Ltd., Chengdu, P. R. China
| | - Yuanlong Chi
- College of Biomass Science and Engineering, Sichuan University, Chengdu, P. R. China
| | - Qun Sun
- College of Life Sciences, Sichuan University, Chengdu, P. R. China
| | - Qiang He
- College of Biomass Science and Engineering, Sichuan University, Chengdu, P. R. China
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Liu Y, Teng K, Wang T, Dong E, Zhang M, Tao Y, Zhong J. Antimicrobial Bacillus velezensis HC6: production of three kinds of lipopeptides and biocontrol potential in maize. J Appl Microbiol 2019; 128:242-254. [PMID: 31559664 DOI: 10.1111/jam.14459] [Citation(s) in RCA: 59] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2019] [Revised: 09/05/2019] [Accepted: 09/15/2019] [Indexed: 11/28/2022]
Abstract
AIMS To study the antimicrobial agents of the Bacillus velezensis strain HC6 and assess the application potential of B. velezensis HC6 in maize. METHODS AND RESULTS We applied a dual culture technique to test the antimicrobial activity of B. velezensis HC6 against bacteria and fungi of common contaminated crops. Bacillus velezensis HC6 showed antagonistic action on pathogenic fungi, including Aspergillus and Fusarium, as well as pathogenic bacteria (especially Listeria monocytogenes). When applied in maize, B. velezensis HC6 could also inhibit the growth of multiple pathogenic fungi and reduce their production of aflatoxin and ochratoxin. Three kinds of antimicrobial lipopeptides, including iturin, fengycin and surfactin were identified in B. velezensis HC6 culture supernatant by high-performance liquid chromatography and MALDI-TOF mass spectrometry. Iturin and fengycin showed obvious antimicrobial activity to the tested fungal strains. CONCLUSIONS Bacillus velezensis HC6 produces three kinds of lipopeptides which showed antimicrobial activity against several common pathogenic fungi and bacteria. Bacillus velezensis HC6 is potential to be biocontrol bacteria in maize. SIGNIFICANCE AND IMPACT OF THE STUDY Bacillus velezensis HC6 shows obvious antimicrobial activity to important crops pathogenic fungi which usually produce mycotoxins that are harmful to animal and human health. We demonstrate that three different types of lipopeptides produced by B. velezensis contributed to the antimicrobial activity. Bacillus velezensis HC6 has the potential to be effective biocontrol agent in crops.
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Affiliation(s)
- Y Liu
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China.,School of Life Science, University of Chinese Academy of Sciences, Beijing, China
| | - K Teng
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
| | - T Wang
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China.,School of Life Science, University of Chinese Academy of Sciences, Beijing, China
| | - E Dong
- LongDa Foodstuff Group Co., Ltd, Laiyang, China
| | - M Zhang
- LongDa Foodstuff Group Co., Ltd, Laiyang, China
| | - Y Tao
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China.,School of Life Science, University of Chinese Academy of Sciences, Beijing, China
| | - J Zhong
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China.,School of Life Science, University of Chinese Academy of Sciences, Beijing, China
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Protein-mediated degradation of aflatoxin B 1 by Pseudomonas putida. Braz J Microbiol 2019; 50:1031-1039. [PMID: 31401783 DOI: 10.1007/s42770-019-00134-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2019] [Accepted: 08/02/2019] [Indexed: 10/26/2022] Open
Abstract
Degradation or the removal of aflatoxin B1 from agriculture commodities is very important because of its acute toxicity and economic loss due to rejection of about 25% contaminated agri produce. The present study aimed at using Pseudomonas putida for the aflatoxin B1 (AFB1) degradation and to understand the mechanism involved. AFB1 degradation was studied with P. putida culture, culture supernatant, cell lysate, cell lysate in the presence of protease inhibitor, and heat-inactivated cell lysate. The remaining AFB1 was qualitatively and quantitatively measured by thin-layer chromatography and HPLC with a UV detector. P. putida culture and culture supernatant showed 80% reduction in AFB1 within 24 h of incubation. Cell lysate and the lysate in the presence of protease inhibitor showed the same reduction in 6 and 4 h respectively. The protease-inhibited lysate showed greater thermostability, broad pH range, and tolerance to some of the solvents and detergents in terms of aflatoxin B1 degrading activity. The heat-inactivated lysate showed only 20% reduction in 24 h of incubation indicating loss of activity on heating. As cell-free supernatant and cell lysate are capable of reducing AFB1 effectively, actively growing cells are not necessary for degradation. The active principle for degradation might be proteinaceous; therefore, heat-inactivated lysate is ineffective for reducing the AFB1. These results showed that degradation of aflatoxin B1 by P. putida might be an enzymatic process and could be used in a broad range of conditions.
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45
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Review: Biotechnology of mycotoxins detoxification using microorganisms and enzymes. Toxicon 2019; 160:12-22. [DOI: 10.1016/j.toxicon.2019.02.001] [Citation(s) in RCA: 75] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Revised: 12/23/2018] [Accepted: 02/03/2019] [Indexed: 01/22/2023]
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Wang N, Li P, Wang M, Chen S, Huang S, Long M, Yang S, He J. The Protective Role of Bacillus velezensis A2 on the Biochemical and Hepatic Toxicity of Zearalenone in Mice. Toxins (Basel) 2018; 10:toxins10110449. [PMID: 30384460 PMCID: PMC6267044 DOI: 10.3390/toxins10110449] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Revised: 10/26/2018] [Accepted: 10/28/2018] [Indexed: 12/17/2022] Open
Abstract
Zearalenone (ZEN) is an estrogen-like mycotoxin produced by Fusarium that seriously compromises the safety of animal and human health. In this study, our aim was to evaluate the protective effect of Bacillus velezensis A2 against biochemical and pathological changes induced by zearalenone in mice. Kunming mice (n = 40; 25 ± 2 g) were allotted to four treatment groups: a control group (basic feed); a ZEN group (basic feed with a ZEN dose of 60 mg/kg); an A2 strain fermented feed group (150 g of feed mixed with 150 mL of sterile distilled water and inoculated with 5 mL of phosphate buffer salt (PBS) resuspended A2 strain); and an A2 strain fermented ZEN-contaminated feed group. (A2 strain group 150 mL pure bacterial distilled water system mixed with 150 g ZEN-contaminated feed.) Our results showed that the Bacillus velezensis A2 strain can completely degrade the ZEN-contaminated feed within 5 days. (The concentration of ZEN in fermentation was 60 μg/mL.) After the mice fed for 28 days, compared with the control group, the activities of AST and ALT were increased, the activities of glutathione peroxidase (GSH-PX) and total superoxide dismutase (T-SOD) were decreased, and the amount of creatinine (CRE), blood urea nitrogen (BUN), uric acid (UA), and malondialdehyde (MDA) in the ZEN group were increased in the mice serum (p < 0.05; p < 0.01). However, compared with the ZEN group, these biochemical levels were reversed in the A2 strain fermented feed group and in the A2 strain fermented ZEN-contaminated feed group (p < 0.05; p < 0.01). Furthermore, histopathological analysis only showed pathological changes of the mice liver in the ZEN group. The results showed that Bacillus velezensis A2 as additive could effectively remove ZEN contamination in the feed and protect the mice against the toxic damage of ZEN. In conclusion, Bacillus velezensis A2 has great potential use as a microbial feed additive to detoxify the toxicity of zearalenone in production practice.
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Affiliation(s)
- Nan Wang
- Key Laboratory of Zoonosis of Liaoning Province, College of Animal Science & Veterinary Medicine, Shenyang Agricultural University, Shenyang 110866, China.
| | - Peng Li
- Key Laboratory of Zoonosis of Liaoning Province, College of Animal Science & Veterinary Medicine, Shenyang Agricultural University, Shenyang 110866, China.
| | - Mingyang Wang
- Key Laboratory of Zoonosis of Liaoning Province, College of Animal Science & Veterinary Medicine, Shenyang Agricultural University, Shenyang 110866, China.
| | - Si Chen
- Key Laboratory of Zoonosis of Liaoning Province, College of Animal Science & Veterinary Medicine, Shenyang Agricultural University, Shenyang 110866, China.
| | - Sheng Huang
- Key Laboratory of Zoonosis of Liaoning Province, College of Animal Science & Veterinary Medicine, Shenyang Agricultural University, Shenyang 110866, China.
| | - Miao Long
- Key Laboratory of Zoonosis of Liaoning Province, College of Animal Science & Veterinary Medicine, Shenyang Agricultural University, Shenyang 110866, China.
| | - Shuhua Yang
- Key Laboratory of Zoonosis of Liaoning Province, College of Animal Science & Veterinary Medicine, Shenyang Agricultural University, Shenyang 110866, China.
| | - Jianbin He
- Key Laboratory of Zoonosis of Liaoning Province, College of Animal Science & Veterinary Medicine, Shenyang Agricultural University, Shenyang 110866, China.
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