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Zhang L, Zhang X, Chen X, Zhang W, Zhao L, Wang Z, Guo Y. Biodegradation of ochratoxin A by Brevundimonas diminuta HAU429: Characterized performance, toxicity evaluation and functional enzymes. Food Res Int 2024; 187:114409. [PMID: 38763660 DOI: 10.1016/j.foodres.2024.114409] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2023] [Revised: 04/17/2024] [Accepted: 04/20/2024] [Indexed: 05/21/2024]
Abstract
Ochratoxin A (OTA) is a notorious mycotoxin commonly contaminating food products worldwide. In this study, an OTA-degrading strain Brevundimonas diminuta HAU429 was isolated by using hippuryl-L-phenylalanine as the sole carbon source. The biodegradation of OTA by strain HAU429 was a synergistic effect of intracellular and extracellular enzymes, which transformed OTA into ochratoxin α (OTα) through peptide bond cleavage. Cytotoxicity tests and cell metabolomics confirmed that the transformation of OTA into OTα resulted in the detoxification of its hepatotoxicity since OTA but not OTα disturbed redox homeostasis and induced oxidative damage to hepatocytes. Genome mining identified nine OTA hydrolase candidates in strain HAU429. They were heterologously expressed in Escherichia coli, and three novel amidohydrolase BT6, BT7 and BT9 were found to display OTA-hydrolyzing activity. BT6, BT7 and BT9 showed less than 45 % sequence identity with previously identified OTA-degrading amidohydrolases. BT6 and BT7 shared 60.9 % amino acid sequence identity, and exhibited much higher activity towards OTA than BT9. BT6 and BT7 could completely degrade 1 μg mL-1 of OTA within 1 h and 50 min, while BT9 hydrolyzed 100 % of OTA in the reaction mixture by 12 h. BT6 was the most thermostable retaining 38 % of activity after incubation at 70 °C for 10 min, while BT7 displayed the highest tolerance to ethanal remaining 76 % of activity in the presence of 6 % ethanol. This study could provide new insights towards microbial OTA degradation and promote the development of enzyme-catalyzed OTA detoxification during food processing.
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Affiliation(s)
- Liangyu Zhang
- College of Animal Science and Technology, Henan Agricultural University, Zhengzhou 450046, China
| | - Xingke Zhang
- College of Animal Science and Technology, Henan Agricultural University, Zhengzhou 450046, China
| | - Xiaoxue Chen
- College of Animal Science and Technology, Henan Agricultural University, Zhengzhou 450046, China
| | - Wei Zhang
- College of Animal Science and Technology, Henan Agricultural University, Zhengzhou 450046, China
| | - Lihong Zhao
- College of Animal Science and Technology, China Agricultural University, Beijing 100193, China
| | - Zhixiang Wang
- College of Animal Science and Technology, Henan Agricultural University, Zhengzhou 450046, China
| | - Yongpeng Guo
- College of Animal Science and Technology, Henan Agricultural University, Zhengzhou 450046, China.
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2
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Ben Miri Y, Benabdallah A, Chentir I, Djenane D, Luvisi A, De Bellis L. Comprehensive Insights into Ochratoxin A: Occurrence, Analysis, and Control Strategies. Foods 2024; 13:1184. [PMID: 38672856 PMCID: PMC11049263 DOI: 10.3390/foods13081184] [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: 03/07/2024] [Revised: 04/04/2024] [Accepted: 04/09/2024] [Indexed: 04/28/2024] Open
Abstract
Ochratoxin A (OTA) is a toxic mycotoxin produced by some mold species from genera Penicillium and Aspergillus. OTA has been detected in cereals, cereal-derived products, dried fruits, wine, grape juice, beer, tea, coffee, cocoa, nuts, spices, licorice, processed meat, cheese, and other foods. OTA can induce a wide range of health effects attributable to its toxicological properties, including teratogenicity, immunotoxicity, carcinogenicity, genotoxicity, neurotoxicity, and hepatotoxicity. OTA is not only toxic to humans but also harmful to livestock like cows, goats, and poultry. This is why the European Union and various countries regulate the maximum permitted levels of OTA in foods. This review intends to summarize all the main aspects concerning OTA, starting from the chemical structure and fungi that produce it, its presence in food, its toxicity, and methods of analysis, as well as control strategies, including both fungal development and methods of inactivation of the molecule. Finally, the review provides some ideas for future approaches aimed at reducing the OTA levels in foods.
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Affiliation(s)
- Yamina Ben Miri
- Department of Biochemistry and Microbiology, Faculty of Sciences, Mohamed Boudiaf University, BP 166, M’sila 28000, Algeria;
| | - Amina Benabdallah
- Laboratory on Biodiversity and Ecosystem Pollution, Faculty of Life and Nature Sciences, University Chadli Bendjedid, El-Tarf 36000, Algeria;
| | - Imene Chentir
- Laboratory of Food, Processing, Control and Agri-Resources Valorization, Higher School of Food Science and Agri-Food Industry, Algiers 16200, Algeria;
| | - Djamel Djenane
- Food Quality and Safety Research Laboratory, Department of Food Sciences, Mouloud Mammeri University, BP 17, Tizi-Ouzou 15000, Algeria;
| | - Andrea Luvisi
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, Università del Salento Palazzina A—Centro Ecotekne via Prov, le Lecce Monteroni, 73100 Lecce, Italy;
| | - Luigi De Bellis
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, Università del Salento Palazzina A—Centro Ecotekne via Prov, le Lecce Monteroni, 73100 Lecce, Italy;
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3
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Yang Y, Zhong W, Wang Y, Yue Z, Zhang C, Sun M, Wang Z, Xue X, Gao Q, Wang D, Zhang Y, Zhang J. Isolation, identification, degradation mechanism and exploration of active enzymes in the ochratoxin A degrading strain Acinetobacter pittii AP19. JOURNAL OF HAZARDOUS MATERIALS 2024; 465:133351. [PMID: 38150759 DOI: 10.1016/j.jhazmat.2023.133351] [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: 08/23/2023] [Revised: 12/20/2023] [Accepted: 12/21/2023] [Indexed: 12/29/2023]
Abstract
Ochratoxin A (OTA) is a polyketide mycotoxin that commonly contaminates agricultural products and causes significant economic losses. In this study, the efficient OTA-degrading strain AP19 was isolated from vineyard soil and was identified as Acinetobacter pittii. Compared with growth in nutrient broth supplemented with OTA (OTA-NB), strain AP19 grew faster in nutrient broth (NB), but the ability of the resulting cell lysates to remove OTA was weaker. After cultivation in NB, the cell lysate of strain AP19 was able to remove 100% of 1 mg/L OTA within 18 h. The cell lysate fraction > 30 kDa degraded 100% of OTA within 12 h, while the fractions < 30 kDa were practically unable to degrade OTA. Further anion exchange chromatography of the > 30 kDa fraction yielded two peaks exhibiting significant OTA degradation activity. The degradation product was identified as OTα. Amino acid metabolism exhibited major transcriptional trends in the response of AP19 to OTA. The dacC gene encoding carboxypeptidase was identified as one of the contributors to OTA degradation. Soil samples inoculated with strain AP19 showed significant OTA degradation. These results provide significant insights into the discovery of novel functions in A. pittii, as well as its potential as an OTA decomposer.
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Affiliation(s)
- Yan Yang
- College of Biotechnology, Tianjin University of Science and Technology, Tianjin 300457, China; Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Weitong Zhong
- College of Biotechnology, Tianjin University of Science and Technology, Tianjin 300457, China; Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Yanning Wang
- College of Biotechnology, Tianjin University of Science and Technology, Tianjin 300457, China; Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Zhiwen Yue
- College of Biotechnology, Tianjin University of Science and Technology, Tianjin 300457, China; Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Chen Zhang
- College of Biotechnology, Tianjin University of Science and Technology, Tianjin 300457, China; Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Mi Sun
- College of Biotechnology, Tianjin University of Science and Technology, Tianjin 300457, China; Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Zhao Wang
- College of Biotechnology, Tianjin University of Science and Technology, Tianjin 300457, China; Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Xianli Xue
- College of Biotechnology, Tianjin University of Science and Technology, Tianjin 300457, China; Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Qiang Gao
- College of Biotechnology, Tianjin University of Science and Technology, Tianjin 300457, China; Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Depei Wang
- College of Biotechnology, Tianjin University of Science and Technology, Tianjin 300457, China; Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Ying Zhang
- College of Food Science and Engineering, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Jian Zhang
- College of Biotechnology, Tianjin University of Science and Technology, Tianjin 300457, China; Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, Tianjin University of Science and Technology, Tianjin 300457, China.
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Stoev SD. Natural feed additives and bioactive supplements versus chemical additives as a safe and practical approach to combat foodborne mycotoxicoses. Front Nutr 2024; 11:1335779. [PMID: 38450227 PMCID: PMC10915786 DOI: 10.3389/fnut.2024.1335779] [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: 11/09/2023] [Accepted: 02/06/2024] [Indexed: 03/08/2024] Open
Abstract
This review highlights the possible hazard of mycotoxins occurrence in foods and feeds in regards to foodborne diseases. The possible management of the risk of contamination of foods and feeds with mycotoxins by using natural feed additives, protecting against deleterious effects of mycotoxins or inhibiting the growth of fungi and mycotoxin production, is deeply investigated in the available literature and some effective measures for safe utilization of mycotoxin contaminated feed/food are proposed. The biological methods of decontamination, degradation or biotransformation of mycotoxins are deeply analyzed and discussed. Some natural antagonists against target fungi are also reviewed and a comparison is made with conventional fungicides for ensuring a safe prevention of mycotoxin contamination. The most common and useful chemical methods of mycotoxins decontamination of agricultural commodities or raw materials are also investigated, e.g., chemical additives inactivating or destroying and/or adsorbing mycotoxins as well as chemical additives inhibiting the growth of fungi and mycotoxin production. The practical use and safety of various kind of feed/food additives or herbal/biological supplements as possible approach for ameliorating the adverse effects of some dangerous mycotoxins is deeply investigated and some suggestions are given. Various possibilities for decreasing mycotoxins toxicity, e.g., by clarifying the mechanisms of their toxicity and using some target antidotes and vitamins as supplements to the diet, are also studied in the literature and appropriate discussions or suggestions are made in this regard. Some studies on animal diets such as low carbohydrate intake, increased protein content, calorie restriction or the importance of dietary fats are also investigated in the available literature for possible amelioration of the ailments associated with mycotoxins exposure. It could be concluded that natural feed additives and bioactive supplements would be more safe and practical approach to combat foodborne mycotoxicoses as compared to chemical additives.
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Affiliation(s)
- Stoycho D. Stoev
- Department of General and Clinical Pathology, Faculty of Veterinary Medicine, Trakia University, Stara Zagora, Bulgaria
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Mwabulili F, Xie Y, Li Q, Sun S, Yang Y, Ma W. Research progress of ochratoxin a bio-detoxification. Toxicon 2023; 222:107005. [PMID: 36539080 DOI: 10.1016/j.toxicon.2022.107005] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2022] [Revised: 11/30/2022] [Accepted: 12/16/2022] [Indexed: 12/23/2022]
Abstract
Ochratoxins (OTs) is an extremely toxic mycotoxin in which Ochratoxin A (OTA) is the most toxic and prevalent in the ochratoxin family. OTA is among the five most critical mycotoxins that are subject to legal regulations. Animals and humans may be exposed to OTA through dietary intake, inhalation, and dermal contact. OTA is considered nephrotoxic, genotoxic, cytotoxic, teratogenic, carcinogenic, mutagenic, immunotoxic, and myelotoxic. So, intake of OTA contaminated foods and feeds can impact the productivity of animals and health of people. According to this review, several studies have reported on the approaches that have been established for OTA removal. This review focused on the control approaches to mitigate OTA contamination, OTA bio-detoxification materials and their applicable techniques, recombinant strains for OTA bio-detoxification, and their detoxification effects, recombinant OTA-degrading enzymes and their sources, recombinant fusion enzymes for OTA, ZEN and AFB1 mycotoxins detoxification, as well as the current application and commercialized OTA bio-detoxification products. However, there is no single technique that has been approved to detoxify OTA by 100% to date. Some preferred current strategies for OTA bio-detoxification have been recombinant degrading enzymes and genetic engineering technology due to their efficiency and safety. Therefore, prospective studies should focus on standardizing pure enzymes from genetically engineered microbial strains that have great potential for OTA detoxification.
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Affiliation(s)
- Fred Mwabulili
- College of Food Science and Engineering, Henan Key Laboratory of Cereal and Oil Food Safety Inspection and Control, Henan University of Technology, Zhengzhou, Henan, 450001, China; Department of Applied Sciences, Mbeya University of Science and Technology, P.O.Box 131, Mbeya, Tanzania
| | - Yanli Xie
- College of Food Science and Engineering, Henan Key Laboratory of Cereal and Oil Food Safety Inspection and Control, Henan University of Technology, Zhengzhou, Henan, 450001, China.
| | - Qian Li
- College of Food Science and Engineering, Henan Key Laboratory of Cereal and Oil Food Safety Inspection and Control, Henan University of Technology, Zhengzhou, Henan, 450001, China
| | - Shumin Sun
- College of Food Science and Engineering, Henan Key Laboratory of Cereal and Oil Food Safety Inspection and Control, Henan University of Technology, Zhengzhou, Henan, 450001, China
| | - Yuhui Yang
- College of Food Science and Engineering, Henan Key Laboratory of Cereal and Oil Food Safety Inspection and Control, Henan University of Technology, Zhengzhou, Henan, 450001, China
| | - Weibin Ma
- College of Food Science and Engineering, Henan Key Laboratory of Cereal and Oil Food Safety Inspection and Control, Henan University of Technology, Zhengzhou, Henan, 450001, China
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Zheng R, Qing H, Ma Q, Huo X, Huang S, Zhao L, Zhang J, Ji C. A Newly Isolated Alcaligenes faecalis ANSA176 with the Capability of Alleviating Immune Injury and Inflammation through Efficiently Degrading Ochratoxin A. Toxins (Basel) 2022; 14:toxins14080569. [PMID: 36006231 PMCID: PMC9415193 DOI: 10.3390/toxins14080569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2022] [Revised: 08/08/2022] [Accepted: 08/17/2022] [Indexed: 12/02/2022] Open
Abstract
Ochratoxin A (OTA) is one of the most prevalent mycotoxins that threatens food and feed safety. Biodegradation of OTA has gained much attention. In this study, an Alcaligenes faecalis strain named ANSA176, with a strong OTA-detoxifying ability, was isolated from donkey intestinal chyme and characterized. The strain ANSA176 could degrade 97.43% of 1 mg/mL OTA into OTα within 12 h, at 37 °C. The optimal levels for bacterial growth were 22–37 °C and pH 6.0–9.0. The effects of ANSA176 on laying hens with an OTA-contaminated diet were further investigated. A total of 36 laying hens were assigned to three dietary treatments: control group, OTA (250 µg/kg) group, and OTA + ANSA176 (6.2 × 108 CFU/kg diet) group. The results showed that OTA decreased the average daily feed intake (ADFI) and egg weight (EW); meanwhile, it increased serum alanine aminopeptidase (AAP), leucine aminopeptidase (LAP), β2-microglobulin (β2-MG), immunoglobulin G (IgG), tumor necrosis factor-α (TNF-α), and glutathione reductase (GR). However, the ANSA176 supplementation inhibited or attenuated the OTA-induced damages. Taken together, OTA-degrading strain A. faecalis ANSA176 was able to alleviate the immune injury and inflammation induced by OTA.
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7
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Surface Molecularly Imprinted Polymers Based on NH2-MIL-53 for Selective Extraction Ochratoxin A in Real Sample. Macromol Res 2022. [DOI: 10.1007/s13233-022-0076-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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8
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Wang L, Hua X, Shi J, Jing N, Ji T, Lv B, Liu L, Chen Y. Ochratoxin A: Occurrence and recent advances in detoxification. Toxicon 2022; 210:11-18. [PMID: 35181402 DOI: 10.1016/j.toxicon.2022.02.010] [Citation(s) in RCA: 28] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Revised: 02/09/2022] [Accepted: 02/13/2022] [Indexed: 12/26/2022]
Abstract
Ochratoxin A (OTA), one of the most important mycotoxins, is mainly produced by fungi in the genera Aspergillus and Penicillium, and commonly found in food and agricultural products. In addition to causing significant economic losses, the occurrence of OTA in foods poses a serious threat to human health. Therefore, it is very important to develop approaches to control or detoxify OTA contamination and thus ensure food safety. In this paper, we review the source and occurrence of OTA in food and agricultural products and the latest achievements in the removal and detoxification of OTA using physical, chemical, and biological methods, with specific attention to influencing factors and mechanisms related to the biodetoxification of OTA. Moreover, the advantages and disadvantages of these methods and their potential application prospect were also discussed.
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Affiliation(s)
- Lan Wang
- Jiangsu Key Laboratory of Crop Genetics and Physiology/Jiangsu Co-Innovation Centre for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou, 225009, China; College of Bioscience and Biotechnology, Yangzhou University, Yangzhou, 225009, China
| | - Xia Hua
- Jiangsu Key Laboratory of Crop Genetics and Physiology/Jiangsu Co-Innovation Centre for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou, 225009, China; College of Bioscience and Biotechnology, Yangzhou University, Yangzhou, 225009, China
| | - Jie Shi
- College of Bioscience and Biotechnology, Yangzhou University, Yangzhou, 225009, China
| | - Ninghao Jing
- College of Bioscience and Biotechnology, Yangzhou University, Yangzhou, 225009, China
| | - Ting Ji
- College of Bioscience and Biotechnology, Yangzhou University, Yangzhou, 225009, China
| | - Bing Lv
- Jiangsu Key Laboratory of Crop Genetics and Physiology/Jiangsu Co-Innovation Centre for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou, 225009, China; College of Bioscience and Biotechnology, Yangzhou University, Yangzhou, 225009, China
| | - Lijun Liu
- Jiangsu Key Laboratory of Crop Genetics and Physiology/Jiangsu Co-Innovation Centre for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou, 225009, China
| | - Yun Chen
- Jiangsu Key Laboratory of Crop Genetics and Physiology/Jiangsu Co-Innovation Centre for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou, 225009, China; College of Bioscience and Biotechnology, Yangzhou University, Yangzhou, 225009, China.
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Wang L, Wang Q, Wang S, Cai R, Yuan Y, Yue T, Wang Z. Bio-control on the contamination of Ochratoxin A in food: Current research and future prospects. Curr Res Food Sci 2022; 5:1539-1549. [PMID: 36161229 PMCID: PMC9489538 DOI: 10.1016/j.crfs.2022.09.007] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2022] [Revised: 07/11/2022] [Accepted: 09/06/2022] [Indexed: 11/30/2022] Open
Abstract
Ochratoxin A (OTA) is a secondary metabolite of several fungi and widely exists in various species of foods. The establishment of effective methods for OTA reduction is a key measure to ensure food processing and human health. This article reviews the current research of OTA reduction by biological approaches, summarizes the characteristics and efficiency of them, and evaluates the transformation pathways and metabolites safety of each degradation technology. The shortcomings of various methods are pointed out and future prospects are also proposed. Biological methods are the most promising approaches for OTA control. The defect of them is the long processing time and the growth of microbial cells may affect the product quality. Therefore, the control of OTA contamination should be conducted according to the food processing and their product types. Besides, it is significant for the exploitation of new strains, enzyme and novel adsorbents. The application of physical and chemical methods has been restricted. Existing biological methods can effectively detoxify OTA. OTA reduction systems should be established for different food. The exploitation of novel equipment, enzyme and adsorbents is essential.
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Affiliation(s)
- Leran Wang
- College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi, 712100, China
- Laboratory of Quality & Safety Risk Assessment for Agro-products (YangLing), Ministry of Agriculture, Yangling, Shaanxi, 712100, China
| | - Qi Wang
- College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi, 712100, China
- Laboratory of Quality & Safety Risk Assessment for Agro-products (YangLing), Ministry of Agriculture, Yangling, Shaanxi, 712100, China
| | - Saiqun Wang
- College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi, 712100, China
- Laboratory of Quality & Safety Risk Assessment for Agro-products (YangLing), Ministry of Agriculture, Yangling, Shaanxi, 712100, China
| | - Rui Cai
- College of Food Science and Engineering, Northwest University, Xi'an, Shaanxi, 710069, China
- Corresponding author.
| | - Yahong Yuan
- College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi, 712100, China
- Laboratory of Quality & Safety Risk Assessment for Agro-products (YangLing), Ministry of Agriculture, Yangling, Shaanxi, 712100, China
| | - Tianli Yue
- College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi, 712100, China
- Laboratory of Quality & Safety Risk Assessment for Agro-products (YangLing), Ministry of Agriculture, Yangling, Shaanxi, 712100, China
- College of Food Science and Engineering, Northwest University, Xi'an, Shaanxi, 710069, China
| | - Zhouli Wang
- College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi, 712100, China
- Laboratory of Quality & Safety Risk Assessment for Agro-products (YangLing), Ministry of Agriculture, Yangling, Shaanxi, 712100, China
- Corresponding author. College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi, 712100, China.
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Genome mining reveals the genes of carboxypeptidase for OTA-detoxification in Bacillus subtilis CW14. Int J Biol Macromol 2021; 186:800-810. [PMID: 34284053 DOI: 10.1016/j.ijbiomac.2021.07.085] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2021] [Revised: 07/13/2021] [Accepted: 07/13/2021] [Indexed: 01/07/2023]
Abstract
Bacillus subtilis CW14, isolated from fresh elk droppings in Beijing Zoo, is a Gram-positive, conferred Generally Recognized as Safe (GRAS) bacterium with the capacity of ochratoxin A (OTA) detoxification. The genome sequence of the CW14 strain showed a size of 4,287,522 bp with 44.06% GC content. It was predicted many putative enzymes involved in degrading mycotoxin by analyzing the signal peptides and the transmembrane regions. Nine extracellular enzymes were predicted relating to OTA detoxification, including four D-Ala-D-Ala carboxypeptidases, two hydrolases, two amidases, and one lactamase. Indeed, two of the carboxypeptidase genes dacA and dacB, expressed in Escherichia coli, were verified contributing to OTA detoxification. DacA and OTA were mixed incubated for 24 h, and the degradation rate reached 71.3%. After purification, the concentration of recombinant DacA protein was 0.5 mg/mL. Bacillus subtilis CW14 and its carboxypeptidases may be used as OTA detoxification agents in food and feed industry production.
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Du G, Liu L, Guo Q, Cui Y, Chen H, Yuan Y, Wang Z, Gao Z, Sheng Q, Yue T. Microbial community diversity associated with Tibetan kefir grains and its detoxification of Ochratoxin A during fermentation. Food Microbiol 2021; 99:103803. [PMID: 34119096 DOI: 10.1016/j.fm.2021.103803] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2020] [Revised: 03/29/2021] [Accepted: 04/01/2021] [Indexed: 11/29/2022]
Abstract
Tibetan kefir grains (TKG) are multi-functional starter cultures used in foods and have been applied in various fermentation systems. This study aimed to investigate the microbial community composition of TKG, the detoxification abilities of TKG and their isolates towards common mycotoxins, and the potential for applying TKG and their associated microbial populations to avoid mycotoxin contamination in dairy products. Cultivation-independent high-throughput sequencing of bacterial and fungal rDNA genes indicated that Lactobacillus kefiranofaciens and Kazachstania turicensis were the most abundant bacterial and fungal taxa, respectively. In addition, 27 total isolates were obtained using cultivation methods. TKG removed more than 90% of the Ochratoxin A (OTA) after 24 h, while the isolate Kazachstania unisporus AC-2 exhibited the highest removal capacity (~46.1%). Further, the isolate exhibited good resistance to acid and bile salts environment. Analysis of the OTA detoxification mechanism revealed that both adsorption and degradation activities were exhibited by TKG, with adsorption playing a major detoxification role. Furthermore, the addition of OTA did not affect the microbial community structure of TKG. These results indicate that TKG-fermented products can naturally remove mycotoxin contamination of milk and could potentially be practically applied as probiotics in fermentation products.
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Affiliation(s)
- Gengan Du
- College of Food Science and Engineering, Northwest A & F University, Yangling, 712100, China; Laboratory of Quality & Safety Risk Assessment for Agro-products (Yangling), Ministry of Agriculture, Yangling, 712100, China
| | - Lin Liu
- College of Food Science and Engineering, Northwest A & F University, Yangling, 712100, China; Laboratory of Quality & Safety Risk Assessment for Agro-products (Yangling), Ministry of Agriculture, Yangling, 712100, China
| | - Qi Guo
- College of Food Science and Engineering, Northwest A & F University, Yangling, 712100, China; Laboratory of Quality & Safety Risk Assessment for Agro-products (Yangling), Ministry of Agriculture, Yangling, 712100, China
| | - Yuanyuan Cui
- College of Food Science and Engineering, Northwest A & F University, Yangling, 712100, China; Laboratory of Quality & Safety Risk Assessment for Agro-products (Yangling), Ministry of Agriculture, Yangling, 712100, China
| | - Hong Chen
- College of Food Science and Engineering, Northwest A & F University, Yangling, 712100, China; Laboratory of Quality & Safety Risk Assessment for Agro-products (Yangling), Ministry of Agriculture, Yangling, 712100, China
| | - Yahong Yuan
- College of Food Science and Engineering, Northwest A & F University, Yangling, 712100, China; Laboratory of Quality & Safety Risk Assessment for Agro-products (Yangling), Ministry of Agriculture, Yangling, 712100, China
| | - Zhouli Wang
- College of Food Science and Engineering, Northwest A & F University, Yangling, 712100, China; Laboratory of Quality & Safety Risk Assessment for Agro-products (Yangling), Ministry of Agriculture, Yangling, 712100, China
| | - Zhenpeng Gao
- College of Food Science and Engineering, Northwest A & F University, Yangling, 712100, China; Laboratory of Quality & Safety Risk Assessment for Agro-products (Yangling), Ministry of Agriculture, Yangling, 712100, China
| | - Qinlin Sheng
- College of Food Science and Engineering, Northwest University, Xi'an, 710069, China
| | - Tianli Yue
- College of Food Science and Engineering, Northwest A & F University, Yangling, 712100, China; Laboratory of Quality & Safety Risk Assessment for Agro-products (Yangling), Ministry of Agriculture, Yangling, 712100, China; College of Food Science and Engineering, Northwest University, Xi'an, 710069, China.
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12
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Zhao M, Wang X, Xu S, Yuan G, Shi X, Liang Z. Degradation of ochratoxin A by supernatant and ochratoxinase of Aspergillus niger W-35 isolated from cereals. WORLD MYCOTOXIN J 2020. [DOI: 10.3920/wmj2019.2446] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Ochratoxin A (OTA) is a mycotoxin produced by Aspergillus spp. and Penicillium spp. and poses a threat to food safety. Biodegradation may be a promising strategy for reducing the OTA contamination in the future. In this study, Aspergillus niger strain W-35 was isolated from cereals and studied for its ability to degrade OTA. Results showed that the supernatant of W-35 could degrade OTA both in vitro and in commercial feeds after incubation at 37 °C for 12 h by 78.0 and 37.0%, respectively. Ochratoxin α (OTα) was assayed as a degradation product by HPLC-FLD. Furthermore, an enzyme specific for OTA degradation (ochratoxinase, OTase) obtained from W-35 was successfully expressed in Escherichia coli BL21, and degraded OTA at a rate of 85.1% for 12 h. These results indicated that this OTA degradation is enzymatic and that the responsible enzyme is extracellular OTase. Reliable degradation of OTA has the potential for wide-ranging applications in the food and feed industries.
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Affiliation(s)
- M. Zhao
- The Supervision, Inspection and Testing Center of Genetically Modified Organisms, Ministry of Agriculture, Beijing 100083, China P.R
- Beijing Laboratory for Food Quality and Safety, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China P.R
| | - X.Y. Wang
- The Supervision, Inspection and Testing Center of Genetically Modified Organisms, Ministry of Agriculture, Beijing 100083, China P.R
- Beijing Laboratory for Food Quality and Safety, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China P.R
| | - S.H. Xu
- The Supervision, Inspection and Testing Center of Genetically Modified Organisms, Ministry of Agriculture, Beijing 100083, China P.R
- Beijing Laboratory for Food Quality and Safety, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China P.R
| | - G.Q. Yuan
- The Supervision, Inspection and Testing Center of Genetically Modified Organisms, Ministry of Agriculture, Beijing 100083, China P.R
- Beijing Laboratory for Food Quality and Safety, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China P.R
| | - X.J. Shi
- Beijing Laboratory for Food Quality and Safety, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China P.R
| | - Z.H. Liang
- The Supervision, Inspection and Testing Center of Genetically Modified Organisms, Ministry of Agriculture, Beijing 100083, China P.R
- Beijing Laboratory for Food Quality and Safety, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China P.R
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13
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Wei W, Qian Y, Wu Y, Chen Y, Peng C, Luo M, Xu J, Zhou Y. Detoxification of ochratoxin A by Lysobacter sp. CW239 and characteristics of a novel degrading gene carboxypeptidase cp4. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2020; 258:113677. [PMID: 31843237 DOI: 10.1016/j.envpol.2019.113677] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2019] [Revised: 11/20/2019] [Accepted: 11/24/2019] [Indexed: 06/10/2023]
Abstract
Ochratoxin A (OTA) is a potent mycotoxin that frequently contaminates agro-products and threatens food safety. A highly efficient OTA degrading strain Lysobacter sp. CW239 was isolated, and the OTA degradation characteristics were investigated. A novel OTA degrading gene carboxypeptidase cp4 was successfully cloned and characterized from CW239. The heterologous recombinant was constructed by gene cp4 and expression vector pET-32a(+) and overexpressed by E. coli BL21 CodonPlus™ (DE3). The recombinant protein rCP4 was purified, and the OTA-degrading activity was evaluated. Although OTA was efficiently degraded by CW239 (24-h degradation ratio of 86.2%), the 24-h OTA degradation ratio for rCP4 was only 36.8% at fairly high concentration (0.25 mg/mL) protein. The degraded product was obtained by immune affinity column (IAC) and determined by mass spectrometry (MS), and the degraded product was the less toxic ochratoxin α (OTα). Based on the serial investigations of this study, OTA might be simultaneously co-degraded by CP4 and another unknown degrading agent in that degrading strain.
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Affiliation(s)
- Wei Wei
- State Key Laboratory for Quality and Safety of Agro-products (in prepared), Institute of Quality and Standard for Agro-Products, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
| | - Yingying Qian
- State Key Laboratory of Tea Biology and Utilization, School of Tea and Food Science Technology, Anhui Agricultural University, Heifei 230036, China
| | - Yanbo Wu
- State Key Laboratory of Tea Biology and Utilization, School of Tea and Food Science Technology, Anhui Agricultural University, Heifei 230036, China
| | - Ying Chen
- State Key Laboratory of Tea Biology and Utilization, School of Tea and Food Science Technology, Anhui Agricultural University, Heifei 230036, China
| | - Cheng Peng
- State Key Laboratory for Quality and Safety of Agro-products (in prepared), Institute of Quality and Standard for Agro-Products, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
| | - Mingzhong Luo
- College of Animal Science, Yangtze University, Jingzhou 434025, China
| | - Junfeng Xu
- State Key Laboratory for Quality and Safety of Agro-products (in prepared), Institute of Quality and Standard for Agro-Products, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China.
| | - Yu Zhou
- State Key Laboratory of Tea Biology and Utilization, School of Tea and Food Science Technology, Anhui Agricultural University, Heifei 230036, China.
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14
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Isolation and identification of a Bacillus megaterium strain with ochratoxin A removal ability and antifungal activity. Food Control 2019. [DOI: 10.1016/j.foodcont.2019.106743] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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15
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Hu H, Jia X, Wang Y, Liang Z. Removal of ochratoxin A by a carboxypeptidase and peptides present in liquid cultures of Bacillus subtilis CW14. WORLD MYCOTOXIN J 2018. [DOI: 10.3920/wmj2017.2296] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Ochratoxin A (OTA) is an important mycotoxin that contaminates a variety of agricultural products. The cell-free supernatant of Bacillus subtilis CW14 liquid cultures were reported previously to be capable of removing OTA efficiently. In this work, we examined several substances that are probably involved in this removal of OTA using in vitro experiments. The strain CW14 culture supernatant that was separated by ultrafiltration showed that the fractions collected at >10 kDa and <3 kDa had a significant ability to reduce OTA (84.9 and 74.8%, respectively) when incubated with 6 μg/ml OTA at 37 °C for 24 h. A putative metalloenzyme was responsible for the activity of the >10-kDa fraction, which was confirmed by the detrimental effects of heat treatments or addition of SDS, proteinase K, or EDTA. Subsequently, a carboxypeptidase (CP) gene that was likely related to the enzymatic conversion of OTA by the >10-kDa fraction was cloned from the B. subtilis CW14 genome, and over-expressed in Escherichia coli. The recombinant CP degraded 71.3% of OTA at 37 °C for 24 h, and ochratoxin α (OTα) was confirmed as a degradation product. From the <3-kDa fraction, some small peptides (1.7 kDa >Mw >0.7 kDa) were purified and decreased OTA by 45.0% under the same conditions, but no product was detected. These peptides were presumed to be capable of binding OTA due to their affinity with the OTA molecule, and the OTA-peptide complexes escaped from the extraction procedures for OTA quantification. These results indicated there was a probable synergistic effect that was involved in removal of OTA by the strain CW14 culture supernatant, which included enzymatic degradation by a CP and physical adsorption by some small peptides.
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Affiliation(s)
- H.N. Hu
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, 100083, China P.R
| | - X. Jia
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, 100083, China P.R
| | - Y.P. Wang
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, 100083, China P.R
| | - Z.H. Liang
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, 100083, China P.R
- Laboratory of Food Safety, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, 100083, China P.R
- The Supervision, Inspection and Testing Center of Genetically Modified Organisms, Ministry of Agriculture, Beijing, 100083, China P.R
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16
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Magnetic covalent organic frameworks based on magnetic solid phase extraction for determination of six steroidal and phenolic endocrine disrupting chemicals in food samples. Microchem J 2018. [DOI: 10.1016/j.microc.2018.08.036] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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17
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Chen W, Li C, Zhang B, Zhou Z, Shen Y, Liao X, Yang J, Wang Y, Li X, Li Y, Shen XL. Advances in Biodetoxification of Ochratoxin A-A Review of the Past Five Decades. Front Microbiol 2018; 9:1386. [PMID: 29997599 PMCID: PMC6028724 DOI: 10.3389/fmicb.2018.01386] [Citation(s) in RCA: 66] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2018] [Accepted: 06/06/2018] [Indexed: 12/11/2022] Open
Abstract
Ochratoxin A (OTA) is a toxic secondary fungal metabolite that widely takes place in various kinds of foodstuffs and feeds. Human beings and animals are inevitably threatened by OTA as a result. Therefore, it is necessary to adopt various measures to detoxify OTA-contaminated foods and feeds. Biological detoxification methods, with better safety, flavor, nutritional quality, organoleptic properties, availability, and cost-effectiveness, are more promising than physical and chemical detoxification methods. The state-of-the-art research advances of OTA biodetoxification by degradation, adsorption, or enzymes are reviewed in the present paper. Researchers have discovered a good deal of microorganisms that could degrade and/or adsorb OTA, including actinobacteria, bacteria, filamentous fungi, and yeast. The degradation of OTA to non-toxic or less toxic OTα via the hydrolysis of the amide bond is the most important OTA biodegradation mechanism. The most important influence factor of OTA adsorption capacity of microorganisms is cell wall components. A large number of microorganisms with good OTA degradation and/or adsorption ability, as well as some OTA degradation enzymes isolated or cloned from microorganisms and animal pancreas, have great application prospects in food and feed industries.
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Affiliation(s)
- Wenying Chen
- School of Public Health, Zunyi Medical University, Zunyi, China
- Experimental Teaching Demonstration Center for Preventive Medicine of Guizhou Province, Zunyi Medical University, Zunyi, China
| | - Chen Li
- School of Public Health, Zunyi Medical University, Zunyi, China
| | - Boyang Zhang
- Department of Pharmacology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, United States
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
| | - Zheng Zhou
- School of Public Health, Zunyi Medical University, Zunyi, China
- Experimental Teaching Demonstration Center for Preventive Medicine of Guizhou Province, Zunyi Medical University, Zunyi, China
| | - Yingbin Shen
- Department of Food Science and Engineering, School of Science and Engineering, Jinan University, Guangzhou, China
| | - Xin Liao
- School of Public Health, Zunyi Medical University, Zunyi, China
| | - Jieyeqi Yang
- School of Public Health, Zunyi Medical University, Zunyi, China
| | - Yan Wang
- Department of Food Quality and Safety, Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Xiaohong Li
- Department of Food and Bioengineering, Beijing Agricultural Vocational College, Beijing, China
| | - Yuzhe Li
- China National Center for Food Safety Risk Assessment, Beijing, China
| | - Xiao L. Shen
- School of Public Health, Zunyi Medical University, Zunyi, China
- Experimental Teaching Demonstration Center for Preventive Medicine of Guizhou Province, Zunyi Medical University, Zunyi, China
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18
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Zhang G, Zhu C, Huang Y, Yan J, Chen A. A Lateral Flow Strip Based Aptasensor for Detection of Ochratoxin A in Corn Samples. Molecules 2018; 23:molecules23020291. [PMID: 29385022 PMCID: PMC6017962 DOI: 10.3390/molecules23020291] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Revised: 01/11/2018] [Accepted: 01/15/2018] [Indexed: 12/17/2022] Open
Abstract
Ochratoxin A (OTA) is a mycotoxin identified as a contaminant in grains and wine throughout the world, and convenient, rapid and sensitive detection methods for OTA have been a long-felt need for food safety monitoring. Herein, we presented a new competitive format based lateral flow strip fluorescent aptasensor for one-step determination of OTA in corn samples. Briefly, biotin-cDNA was immobilized on the surface of a nitrocellulose filter on the test line. Without OTA, Cy5-labeled aptamer combined with complementary strands formed a stable double helix. In the presence of OTA, however, the Cy5-aptamer/OTA complexes were generated, and therefore less free aptamer was captured in the test zone, leading to an obvious decrease in fluorescent signals on the test line. The test strip showed an excellent linear relationship in the range from 1 ng·mL−1 to 1000 ng·mL−1 with the LOD of 0.40 ng·mL−1, IC15 value of 3.46 ng·mL−1 and recoveries from 96.4% to 104.67% in spiked corn samples. Thus, the strip sensor developed in this study is an acceptable alternative for rapid detection of the OTA level in grain samples.
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Affiliation(s)
- Guilan Zhang
- Key Laboratory of Agro-Product Quality and Safety, Institute of Quality Standards and Testing Technology for Agro-Products, Chinese Academy of Agricultural Sciences, Beijing 100081, China.
| | - Chao Zhu
- Key Laboratory of Agro-Product Quality and Safety, Institute of Quality Standards and Testing Technology for Agro-Products, Chinese Academy of Agricultural Sciences, Beijing 100081, China.
| | - Yafei Huang
- Key Laboratory of Agro-Product Quality and Safety, Institute of Quality Standards and Testing Technology for Agro-Products, Chinese Academy of Agricultural Sciences, Beijing 100081, China.
- College of Food Science and Technology, Hainan University, Haikou 570228, China.
| | - Jiao Yan
- Key Laboratory of Agro-Product Quality and Safety, Institute of Quality Standards and Testing Technology for Agro-Products, Chinese Academy of Agricultural Sciences, Beijing 100081, China.
- College of Food Science and Technology, Hainan University, Haikou 570228, China.
| | - Ailiang Chen
- Key Laboratory of Agro-Product Quality and Safety, Institute of Quality Standards and Testing Technology for Agro-Products, Chinese Academy of Agricultural Sciences, Beijing 100081, China.
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