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Kim SH, Park SH, Ahn JB, Kang DH. Inactivation of E. coli O157:H7, Salmonella enterica, and L. monocytogenes through semi-continuous superheated steam treatment with additional effects of enhancing initial germination rate and salinity tolerance. Food Microbiol 2024; 117:104373. [PMID: 37918996 DOI: 10.1016/j.fm.2023.104373] [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: 04/23/2023] [Revised: 08/26/2023] [Accepted: 08/28/2023] [Indexed: 11/04/2023]
Abstract
Superheated steam (SHS) is a powerful technology used to reduce bacteria on food surfaces while causing less damage to the underlying sublayer of food compared to conventional heating treatments. In this study, a semi-continuous SHS system was developed to inactivate foodborne pathogens within 1 s (Escherichia coli O157:H7, Salmonella enterica, and Listeria monocytogenes) on radish seed surfaces and to enhance the seeds' salinity tolerance, which is vital for adapting to arid and semi-arid regions. The temperature of the SHS was set to 200 °C and 300 °C, with flow rates of 5 m/s and 7 m/s, and treatments were cycled either once or three times. As a result, increased temperature (200 °C-300 °C) and number of treatments (1 time to 3 times) led to a significantly larger microbial reduction on the surface of radish seeds. E. coli O157:H7, S. enterica, and L. monocytogenes were reduced by 4.42, 4.73, and 3.95 log CFU/g (P < 0.05), respectively, after three SHS treatments at 300 °C and 7 m/s. However, due to the ongoing potential for recovery of residual microorganisms, further research involving combinations is essential to enhance the microbicidal effect. Water imbibition showed significantly higher values in the SHS-treated group up to 30 min, indicating faster germination rates in the SHS-treated group (71.3-81.3%) compared to the control group (52.7%) on the second day, indicating a significant enhancement in germination rate. In addition, the salinity resistance of the radish seeds increased after SHS treatment. When moisturized with 0.5% NaCl solution, more radish seeds germinated after treatment with SHS (40%) than controls (22.7%) (P < 0.05). The results of this study, the first to apply semi-continuous SHS to seeds, are expected to serve as a cornerstone for future pilot-scale investigations aiming to implement the system within the seed industry.
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Affiliation(s)
- Soo-Hwan Kim
- Department of Food and Animal Biotechnology, Department of Agricultural Biotechnology, Center for Food and Bioconvergence, Research Institute for Agricultural and Life Sciences, Seoul National University, Seoul, 08826, Republic of Korea
| | - Sang-Hyun Park
- Department of Food Science and Technology, Kongju National University, Yesan, Chungnam, 32439, Republic of Korea
| | - Jun-Bae Ahn
- 4 School of Food Service & Culinary Arts, Seowon University, Cheongju, Chungbuk, Republic of Korea
| | - Dong-Hyun Kang
- Department of Food and Animal Biotechnology, Department of Agricultural Biotechnology, Center for Food and Bioconvergence, Research Institute for Agricultural and Life Sciences, Seoul National University, Seoul, 08826, Republic of Korea; Institutes of Green Bio Science & Technology, Seoul National University, Pyeongchang-gun, Gangwon-do, 25354, Republic of Korea.
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2
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Yan H, Li W, Chen H, Liao Q, Xia M, Wu D, Liu C, Chen J, Zou L, Peng L, Zhao G, Zhao J. Effects of Storage Temperature, Packaging Material and Wash Treatment on Quality and Shelf Life of Tartary Buckwheat Microgreens. Foods 2022; 11:foods11223630. [PMID: 36429221 PMCID: PMC9689458 DOI: 10.3390/foods11223630] [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: 10/14/2022] [Revised: 11/07/2022] [Accepted: 11/09/2022] [Indexed: 11/16/2022] Open
Abstract
Tartary buckwheat microgreens (TBM) are popular worldwide products but display an extremely short shelf life. Thus, the effects of storage temperature, packaging material, and wash treatment on the quality and shelf life were analyzed. Headspace composition, weight loss, electrolyte leakage, microbial population and sensory quality were investigated during storage. Results showed that shelf life and quality of TBM decreased with the increment of storage temperature when stored at 5-25 °C. During 5 °C storage, LDPE bags were the best packaging materials for preserving the quality of LDPE, PE and HDPE bags. On the basis of 5 °C and LDPE packages, ClO2 + citric acid wash treatment could further inhibit quality deterioration and extend the shelf life. The results demonstrated bioactive constituents and antioxidant capacity were significantly affected by storage time. The study provides insights into developing optimal packaging and storage conditions for TBM.
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Affiliation(s)
- Huiling Yan
- Key Laboratory of Coarse Cereal Processing, Ministry of Agriculture and Rural Affairs, Sichuan Province Engineering Technology Research Center of Coarse Cereal Industrialization, School of Food and Biological Engineering, Chengdu University, Chengdu 610106, China
| | - Wenfei Li
- Key Laboratory of Coarse Cereal Processing, Ministry of Agriculture and Rural Affairs, Sichuan Province Engineering Technology Research Center of Coarse Cereal Industrialization, School of Food and Biological Engineering, Chengdu University, Chengdu 610106, China
| | - Hongxu Chen
- Key Laboratory of Coarse Cereal Processing, Ministry of Agriculture and Rural Affairs, Sichuan Province Engineering Technology Research Center of Coarse Cereal Industrialization, School of Food and Biological Engineering, Chengdu University, Chengdu 610106, China
| | - Qingxia Liao
- Key Laboratory of Coarse Cereal Processing, Ministry of Agriculture and Rural Affairs, Sichuan Province Engineering Technology Research Center of Coarse Cereal Industrialization, School of Food and Biological Engineering, Chengdu University, Chengdu 610106, China
| | - Mengying Xia
- Key Laboratory of Coarse Cereal Processing, Ministry of Agriculture and Rural Affairs, Sichuan Province Engineering Technology Research Center of Coarse Cereal Industrialization, School of Food and Biological Engineering, Chengdu University, Chengdu 610106, China
| | - Dingtao Wu
- Key Laboratory of Coarse Cereal Processing, Ministry of Agriculture and Rural Affairs, Sichuan Province Engineering Technology Research Center of Coarse Cereal Industrialization, School of Food and Biological Engineering, Chengdu University, Chengdu 610106, China
| | - Changying Liu
- Key Laboratory of Coarse Cereal Processing, Ministry of Agriculture and Rural Affairs, Sichuan Province Engineering Technology Research Center of Coarse Cereal Industrialization, School of Food and Biological Engineering, Chengdu University, Chengdu 610106, China
| | - Jianxiong Chen
- Huantai Biotechnology Company Ltd., Chengdu 610213, China
| | - Liang Zou
- Key Laboratory of Coarse Cereal Processing, Ministry of Agriculture and Rural Affairs, Sichuan Province Engineering Technology Research Center of Coarse Cereal Industrialization, School of Food and Biological Engineering, Chengdu University, Chengdu 610106, China
| | - Lianxin Peng
- Key Laboratory of Coarse Cereal Processing, Ministry of Agriculture and Rural Affairs, Sichuan Province Engineering Technology Research Center of Coarse Cereal Industrialization, School of Food and Biological Engineering, Chengdu University, Chengdu 610106, China
| | - Gang Zhao
- Key Laboratory of Coarse Cereal Processing, Ministry of Agriculture and Rural Affairs, Sichuan Province Engineering Technology Research Center of Coarse Cereal Industrialization, School of Food and Biological Engineering, Chengdu University, Chengdu 610106, China
| | - Jianglin Zhao
- Key Laboratory of Coarse Cereal Processing, Ministry of Agriculture and Rural Affairs, Sichuan Province Engineering Technology Research Center of Coarse Cereal Industrialization, School of Food and Biological Engineering, Chengdu University, Chengdu 610106, China
- Correspondence: ; Tel.: +86-18-2845-58669
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3
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Wu L, Chen S, Guo L, Shpyleva S, Harris K, Fahmi T, Flanigan T, Tong W, Xu J, Ren Z. Development of benchmark datasets for text mining and sentiment analysis to accelerate regulatory literature review. Regul Toxicol Pharmacol 2022; 137:105287. [PMID: 36372266 DOI: 10.1016/j.yrtph.2022.105287] [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: 03/14/2022] [Revised: 10/18/2022] [Accepted: 11/06/2022] [Indexed: 11/13/2022]
Abstract
In the field of regulatory science, reviewing literature is an essential and important step, which most of the time is conducted by manually reading hundreds of articles. Although this process is highly time-consuming and labor-intensive, most output of this process is not well transformed into machine-readable format. The limited availability of data has largely constrained the artificial intelligence (AI) system development to facilitate this literature reviewing in the regulatory process. In the past decade, AI has revolutionized the area of text mining as many deep learning approaches have been developed to search, annotate, and classify relevant documents. After the great advancement of AI algorithms, a lack of high-quality data instead of the algorithms has recently become the bottleneck of AI system development. Herein, we constructed two large benchmark datasets, Chlorine Efficacy dataset (CHE) and Chlorine Safety dataset (CHS), under a regulatory scenario that sought to assess the antiseptic efficacy and toxicity of chlorine. For each dataset, ∼10,000 scientific articles were initially collected, manually reviewed, and their relevance to the review task were labeled. To ensure high data quality, each paper was labeled by a consensus among multiple experienced reviewers. The overall relevance rate was 27.21% (2,663 of 9,788) for CHE and 7.50% (761 of 10,153) for CHS, respectively. Furthermore, the relevant articles were categorized into five subgroups based on the focus of their content. Next, we developed an attention-based classification language model using these two datasets. The proposed classification model yielded 0.857 and 0.908 of Area Under the Curve (AUC) for CHE and CHS dataset, respectively. This performance was significantly better than permutation test (p < 10E-9), demonstrating that the labeling processes were valid. To conclude, our datasets can be used as benchmark to develop AI systems, which can further facilitate the literature review process in regulatory science.
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Affiliation(s)
- Leihong Wu
- Division of Bioinformatics and Biostatics, National Center for Toxicological Research, U.S. FDA, Jefferson, AR, 72079, USA.
| | - Si Chen
- Division of Biochemical Toxicology, National Center for Toxicological Research, U.S. FDA, Jefferson, AR, 72079, USA
| | - Lei Guo
- Division of Biochemical Toxicology, National Center for Toxicological Research, U.S. FDA, Jefferson, AR, 72079, USA
| | - Svitlana Shpyleva
- Division of Biochemical Toxicology, National Center for Toxicological Research, U.S. FDA, Jefferson, AR, 72079, USA
| | - Kelly Harris
- Division of Genetic and Molecular Toxicology, National Center for Toxicological Research, U.S. FDA, Jefferson, AR, 72079, USA
| | - Tariq Fahmi
- Office of Scientific Coordination, National Center for Toxicological Research, U.S. FDA, Jefferson, AR, 72079, USA
| | - Timothy Flanigan
- Division of Neurotoxicology, National Center for Toxicological Research, U.S. FDA, Jefferson, AR, 72079, USA
| | - Weida Tong
- Division of Bioinformatics and Biostatics, National Center for Toxicological Research, U.S. FDA, Jefferson, AR, 72079, USA
| | - Joshua Xu
- Division of Bioinformatics and Biostatics, National Center for Toxicological Research, U.S. FDA, Jefferson, AR, 72079, USA
| | - Zhen Ren
- Division of Biochemical Toxicology, National Center for Toxicological Research, U.S. FDA, Jefferson, AR, 72079, USA.
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4
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Fu Y, Bhunia AK, Yao Y. Alginate-based antimicrobial coating reduces pathogens on alfalfa seeds and sprouts. Food Microbiol 2022; 103:103954. [DOI: 10.1016/j.fm.2021.103954] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Revised: 10/17/2021] [Accepted: 11/19/2021] [Indexed: 11/26/2022]
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5
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Kim WI, Choi SY, Han I, Cho SK, Lee Y, Kim S, Kang B, Choi O, Kim J. Inhibition of Salmonella enterica growth by competitive exclusion during early alfalfa sprout development using a seed-dwelling Erwinia persicina strain EUS78. Int J Food Microbiol 2020; 312:108374. [DOI: 10.1016/j.ijfoodmicro.2019.108374] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2019] [Revised: 08/27/2019] [Accepted: 09/22/2019] [Indexed: 11/16/2022]
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6
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Escamilla D, Rosso ML, Zhang B. Identification of fungi associated with soybeans and effective seed disinfection treatments. Food Sci Nutr 2019; 7:3194-3205. [PMID: 31660133 PMCID: PMC6804755 DOI: 10.1002/fsn3.1166] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Revised: 06/26/2019] [Accepted: 07/01/2019] [Indexed: 12/01/2022] Open
Abstract
Sprouts can be a vehicle for the transmission of several pathogens capable of causing human illness, and the potential source of contamination is seed used for sprouting. The limited information about seed-borne pathogens as well as their incidence on soybean seeds for soybean sprout industry led the objectives of this study that were to identify seed-borne pathogens on commercial sprout soybean seeds and to evaluate different decontamination treatments on disinfection effectiveness and sprout quality. Seeds of "MFS-561," a sprout soybean cultivar, from three production regions were used in this study. The internal transcribed spacer (ITS1 and ITS2) DNA sequences of the isolated fungi from MFS-561 seeds were used for species identification. Seven disinfection treatments were evaluated on their effectiveness on reducing fungal incidence and impact on sprout characteristics. Out of 55 fungal isolates obtained from the soybean seeds, seven species and six genera were identified. The most frequent genera across regions were Alternaria, Diaphorte, and Fusarium. The treatment of soaking seeds in 2% calcium hypochlorite for 10 min and 5% acetic acid for 2 min before sprouting were promising seed disinfection treatments as they significantly reduced fungi incidence without any negative effects on sprout quality.
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Affiliation(s)
| | - Maria Luciana Rosso
- School of Plant and Environmental SciencesVirginia Polytechnic Institute and State UniversityBlacksburgVAUSA
| | - Bo Zhang
- School of Plant and Environmental SciencesVirginia Polytechnic Institute and State UniversityBlacksburgVAUSA
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7
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Park SH, Ahn JB, Kang DH. Inactivation of foodborne pathogens on alfalfa and radish seeds by sequential treatment with chlorine dioxide gas and dry heat. Food Control 2018. [DOI: 10.1016/j.foodcont.2017.08.016] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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8
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Zhang C, Cao W, Hung YC, Li B. Application of electrolyzed oxidizing water in production of radish sprouts to reduce natural microbiota. Food Control 2016. [DOI: 10.1016/j.foodcont.2016.02.045] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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9
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Liu J, Wang Q, Karagić Đ, Liu X, Cui J, Gui J, Gu M, Gao W. Effects of ultrasonication on increased germination and improved seedling growth of aged grass seeds of tall fescue and Russian wildrye. Sci Rep 2016; 6:22403. [PMID: 26928881 PMCID: PMC4772161 DOI: 10.1038/srep22403] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2015] [Accepted: 02/12/2016] [Indexed: 11/10/2022] Open
Abstract
The effects of ultrasonic treatments on the germination and seedling growth of aged tall fescue (Festuca arundinacea) and Russian wild rye (Psathyrostaehys juncea Nevski) seeds were determined using orthogonal matrix experimental design with four ultrasonic factors. The multivariate analysis of variance detected significant differences and coupling effects of the pair-wise factors. The activities of Superoxide Dismutase (SOD) and Peroxidase (POD) and the Malondialdehyde (MDA) content were affected. The ultrasonic treatments had positive effects on the germination percentage (GP) of the aged seeds and the growth of the seedlings (GS) and therefore we provided a basic evidence for the application of ultrasonic treatment to pretreat aged grass seeds. For the four ultrasonic factors, the optimal conditions were a sonication time of 36.7 min, a sonication temperature of 35 °C, an output power of 367 W and a seed soaking time 4.1 h after binary quadratic regressions analyses. The ultrasonic treatment has the potential to improve seedling growth. Moreover, the longevity of the tall fescue and the Russian wild rye seeds was approximately 9.5 and 11.5 years, respectively, under natural conditions of storage. The physiological mechanisms that might contribute to the improved GP and GS were discussed.
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Affiliation(s)
- Juan Liu
- College of Animal Sci. and Techn., Northwest A&F University, Yangling 712100, Shaanxi Province, China
| | - Quanzhen Wang
- College of Animal Sci. and Techn., Northwest A&F University, Yangling 712100, Shaanxi Province, China
| | - Đura Karagić
- Institute of Field and Vegetable Crops, Forage Crops Department, Maksima Gorkog 30, 21000 Novi Sad, Serbia
| | - Xv Liu
- College of Animal Sci. and Techn., Northwest A&F University, Yangling 712100, Shaanxi Province, China
| | - Jian Cui
- College of Life Science, Northwest A&F University, Yangling 712100, Shaanxi Province, China
| | - Jing Gui
- College of Animal Sci. and Techn., Northwest A&F University, Yangling 712100, Shaanxi Province, China
| | - Muyu Gu
- College of Animal Sci. and Techn., Northwest A&F University, Yangling 712100, Shaanxi Province, China
| | - Wei Gao
- College of Animal Sci. and Techn., Northwest A&F University, Yangling 712100, Shaanxi Province, China
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10
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Nei D, Enomoto K, Nakamura N. A gaseous acetic acid treatment to disinfect fenugreek seeds and black pepper inoculated with pathogenic and spoilage bacteria. Food Microbiol 2015; 49:226-30. [DOI: 10.1016/j.fm.2015.02.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2014] [Revised: 02/17/2015] [Accepted: 02/18/2015] [Indexed: 10/23/2022]
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11
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Wang Q, Kniel KE. Effectiveness of Calcium Hypochlorite on Viral and Bacterial Contamination of Alfalfa Seeds. Foodborne Pathog Dis 2014; 11:759-68. [DOI: 10.1089/fpd.2014.1766] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Qing Wang
- Department of Animal and Food Sciences, University of Delaware, Newark, Delaware
| | - Kalmia E. Kniel
- Department of Animal and Food Sciences, University of Delaware, Newark, Delaware
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12
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Szabó S, Németh Z, Polyák É, Bátai I, Kerényi M, Figler M. Antibacterial effect of sprouts against human pathogens in vitro. ACTA ALIMENTARIA 2014. [DOI: 10.1556/aalim.43.2014.3.18] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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13
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Nei D, Enomoto K, Yamamoto K. Large-scale gaseous acetic acid treatment to disinfect alfalfa seeds inoculated with Escherichia coli. Foodborne Pathog Dis 2014; 11:332-4. [PMID: 24400985 DOI: 10.1089/fpd.2013.1637] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Most outbreaks of foodborne illness related to sprout consumption are ascribed to bacterial contamination of its seeds, and they need disinfection before sprouting. Recently, gaseous acetic acid (GAA) treatment received great attention as a method for seed disinfection. In this study, the effect of GAA treatment on alfalfa seed disinfection was evaluated in a large-scale device to simulate practical applications. Alfalfa seeds (3 kg) inoculated with Escherichia coli were treated with 8.7% (vol/vol) GAA at 55°C for 1-3 h. The population of E. coli was significantly reduced (p<0.05), and the reduction was larger with longer exposure times. After 3-h treatment, a maximum decrease by more than 5 log colony-forming units/g was observed. The germination ratio of alfalfa seeds was not affected by the treatments under all the conditions. The results indicated that the GAA treatment has a potential for practical application to reduce the risk of foodborne illness caused by consumption of sprouts.
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Affiliation(s)
- Daisuke Nei
- 1 National Food Research Institute , Tsukuba, Japan
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14
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Sikin AM, Zoellner C, Rizvi SSH. Current intervention strategies for the microbial safety of sprouts. J Food Prot 2013; 76:2099-123. [PMID: 24290689 DOI: 10.4315/0362-028x.jfp-12-437] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Sprouts have gained popularity worldwide due to their nutritional values and health benefits. The fact that their consumption has been associated with numerous outbreaks of foodborne illness threatens the $250 million market that this industry has established in the United States. Therefore, sprout manufacturers have utilized the U.S. Food and Drug Administration recommended application of 20,000 ppm of calcium hypochlorite solution to seeds before germination as a preventative method. Concentrations of up to 200 ppm of chlorine wash are also commonly used on sprouts. However, chlorine-based treatment achieves on average only 1- to 3-log reductions in bacteria and is associated with negative health and environmental issues. The search for alternative strategies has been widespread, involving chemical, biological, physical, and hurdle processes that can achieve up to 7-log reductions in bacteria in some cases. The compilation here of the current scientific data related to these techniques is used to compare their efficacy for ensuring the microbial safety of sprouts and their practicality for commercial producers. Of specific importance for alternative seed and sprout treatments is maintaining the industry-accepted germination rate of 95% and the sensorial attributes of the final product. This review provides an evaluation of suggested decontamination technologies for seeds and sprouts before, during, and after germination and concludes that thermal inactivation of seeds and irradiation of sprouts are the most practical stand-alone microbial safety interventions for sprout production.
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Affiliation(s)
- Adi Md Sikin
- Institute of Food Science, Cornell University, Stocking Hall, Ithaca, New York 14853-7201, USA; Universiti Teknologi MARA, Shah Alam, Selangor, Malaysia.
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15
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Yang Y, Meier F, Ann Lo J, Yuan W, Lee Pei Sze V, Chung HJ, Yuk HG. Overview of Recent Events in the Microbiological Safety of Sprouts and New Intervention Technologies. Compr Rev Food Sci Food Saf 2013. [DOI: 10.1111/1541-4337.12010] [Citation(s) in RCA: 87] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
| | - Fabienne Meier
- Food Science & Technology Programme; Dept. of Chemistry; National Univ. of Singapore; 3 Science Drive 3; Singapore; 117543
| | - Jerilyn Ann Lo
- Food Science & Technology Programme; Dept. of Chemistry; National Univ. of Singapore; 3 Science Drive 3; Singapore; 117543
| | - Wenqian Yuan
- Food Science & Technology Programme; Dept. of Chemistry; National Univ. of Singapore; 3 Science Drive 3; Singapore; 117543
| | - Valarie Lee Pei Sze
- Food Science & Technology Programme; Dept. of Chemistry; National Univ. of Singapore; 3 Science Drive 3; Singapore; 117543
| | - Hyun-Jung Chung
- Dept. of Food and Nutrition; Inha Univ.; Incheon 402-751; Korea
| | - Hyun-Gyun Yuk
- Food Science & Technology Programme; Dept. of Chemistry; National Univ. of Singapore; 3 Science Drive 3; Singapore; 117543
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16
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Van der Linden I, Cottyn B, Uyttendaele M, Vlaemynck G, Maes M, Heyndrickx M. Long-term survival of Escherichia coli O157:H7 and Salmonella enterica on butterhead lettuce seeds, and their subsequent survival and growth on the seedlings. Int J Food Microbiol 2013; 161:214-9. [PMID: 23334101 DOI: 10.1016/j.ijfoodmicro.2012.12.015] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2012] [Revised: 12/19/2012] [Accepted: 12/23/2012] [Indexed: 11/20/2022]
Abstract
The long-term survival of enteric pathogens on butterhead lettuce seeds, and their subsequent survival and growth on seedlings were investigated. Lettuce seeds were inoculated at a high level with two Salmonella enterica and two Escherichia coli O157:H7 strains each (±8 log₁₀ CFU/g seed) and the survival of the pathogens was monitored over two years using standard plating techniques on selective medium. The Salmonella strains (serovars Typhimurium and Thompson) survived significantly better on the seeds than the E. coli O157:H7 strains (MB3885 and NCTC12900). When individual seeds were tested two years after inoculation, Salmonella was recovered from each individual seed, whereas E. coli O157:H7 only from 4% to 14% of the seeds, depending on the recovery method. When contaminated stored seeds were germinated and the seedlings examined for presence of the pathogens, it was clear that both pathogens were able to proliferate on the seedlings. Pathogen counts up to 5.92 log₁₀ CFU and 4.41 log₁₀ CFU per positive seedling were observed for Salmonella and E. coli O157:H7, respectively. Our study not only confirms the long-term survival of enteric pathogens on seeds but also shows that the pathogens maintain their ability to resuscitate and proliferate on the seedlings. Seeds or seedlings should be considered as contamination sources for the cultivation of leafy vegetables such as butterhead lettuce grown in greenhouses.
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Affiliation(s)
- Inge Van der Linden
- Institute for Agricultural and Fisheries Research-ILVO, Technology and Food Science Unit-Food Safety, Brusselsesteenweg 370, B-9090 Melle, Belgium
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17
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Scientific Opinion on the risk posed by Shiga toxin-producingEscherichia coli(STEC) and other pathogenic bacteria in seeds and sprouted seeds. EFSA J 2011. [DOI: 10.2903/j.efsa.2011.2424] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
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