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Moro GE, Girard M, Peila C, Garcia N, Escuder-Vieco D, Keller K, Cassidy T, Bertino E, Boquien CY, Buffin R, Calvo J, Gaya A, Gebauer C, Lamireau D, Lembo D, Picaud JC, Wesolowska A, Arslanoglu S, Cavallarin L, Giribaldi M. New alternatives to holder pasteurization in processing donor milk in human milk banks. Front Nutr 2024; 11:1409381. [PMID: 38988859 PMCID: PMC11234892 DOI: 10.3389/fnut.2024.1409381] [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: 03/29/2024] [Accepted: 05/13/2024] [Indexed: 07/12/2024] Open
Abstract
Infectious and toxicological risks are the main potential hazards that operators of Human Milk Banks (HMBs) encounter and must eliminate. HMBs are trying to implement procedures that allow to manage and sanitize human milk without altering significantly its nutritional and biologically protective components, obtaining a product characterized by a valid balance between safety and biological quality. The history of human milk processing is linked to the origins of HMBs themselves. And although other forms of sterilization were used originally, pasteurization soon became the recognized most effective means for sanitizing milk: all the milk that arrives at the HMB must be pasteurized. Holder pasteurization (HoP) is the most used methodology, and it is performed using low temperature and long time (+62.5°C for 30 min). With HoP some bioactive milk components are lost to varying degrees, but many other precious bioactive compounds are completely or partially preserved. To improve the quality of human milk processed by HMBs, maintaining in the meantime the same microbiological safety offered by HoP, new technologies are under evaluation. At present, High-Temperature Short-Time pasteurization (HTST) and High-Pressure Processing are the most studied methodologies. HTST is already utilized in some HMBs for daily practical activity and for research purposes. They seem to be superior to HoP for a better preservation of some nutritional and biologically protective components. Freeze-drying or lyophilization may have advantages for room temperature storage and transportation. The aim of this study is to evaluate the advancement regarding the processing of DHM with a literature search from 2019 to 2022. The effects of the new technologies on safety and quality of human milk are presented and discussed. The new technologies should assure microbiological safety of the final product at least at the same level as optimized HoP, with an improved preservation of the nutritional and bioactive components of raw human milk.
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Affiliation(s)
- Guido E Moro
- Associazione Italiana delle Banche del Latte Umano Donato (AIBLUD), Milan, Italy
| | - Melissa Girard
- Medical Affairs and Innovation, Héma-Québec, Québec, QC, Canada
| | - Chiara Peila
- Neonatal Unit, Department of Public Health and Pediatrics, University of Turin, Turin, Italy
| | - Nadia Garcia
- Banco Regional de Leche Materna Aladina-MGU, Hospital Universitario 12 de Octubre, Madrid, Spain
| | - Diana Escuder-Vieco
- Banco Regional de Leche Materna Aladina-MGU, Hospital Universitario 12 de Octubre, Madrid, Spain
| | - Kristin Keller
- Banco Regional de Leche Materna Aladina-MGU, Hospital Universitario 12 de Octubre, Madrid, Spain
| | - Tanya Cassidy
- Kathleen Lonsdale Health Research Institute, Maynooth University, Maynooth, Ireland
| | - Enrico Bertino
- Neonatal Unit, Department of Public Health and Pediatrics, University of Turin, Turin, Italy
| | | | - Rachel Buffin
- Neonatology UnitCroix-Rousse University Hospital, Hospices Civils de Lyon, Lyon, France
- Rhône-Alpes-Auvergne Regional Human Milk Bank, Croix-Rousse University Hospital, Hospices Civils de Lyon, Lyon, France
| | - Javier Calvo
- Group of Cell Therapy and Tissue Engineering (TERCIT), Fundació Banc de Sang i Teixits de les Illes Balears (FBSTIB), Research Institute on Health Sciences (IUNICS) and Health Research Institute of the Balearic Islands (IdISBa), Palma, Spain
| | - Antoni Gaya
- Group of Cell Therapy and Tissue Engineering (TERCIT), Fundació Banc de Sang i Teixits de les Illes Balears (FBSTIB), Research Institute on Health Sciences (IUNICS) and Health Research Institute of the Balearic Islands (IdISBa), Palma, Spain
| | - Corinna Gebauer
- Abteilung Neonatologie Klinik und Poliklinik für Kinder und Jugendliche, Leipzig, Germany
| | - Delphine Lamireau
- Human Milk Bank of University Hospital of Bordeaux, Lamireau, France
| | - David Lembo
- Laboratory of Molecular Virology and Antiviral Research, Department of Clinical and Biological Sciences, University of Turin, Turin, Italy
| | - Jean-Charles Picaud
- Department of Neonatology, Hôpital de la Croix-Rousse, Hospices Civils de Lyon, Lyon, France
- CarMen Laboratory, INSERM, INRA, Université Claude Bernard Lyon1, Lyon, France
| | - Aleksandra Wesolowska
- Laboratory of Human Milk and Lactation Research at Milk Bank in Holy Family Hospital, Department of Medical Biology, Faculty of Health Science, Medical University of Warsaw, Warsaw, Poland
| | - Sertac Arslanoglu
- Division of Neonatology, Department of Pediatrics, Istanbul Medeniyet University, Istanbul, Türkiye
| | - Laura Cavallarin
- Consiglio Nazionale delle Ricerche, Istituto di Scienze delle Produzioni Alimentari, Turin, Italy
| | - Marzia Giribaldi
- Consiglio Nazionale delle Ricerche, Istituto di Scienze delle Produzioni Alimentari, Turin, Italy
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2
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Kim KM, Cho ES, Ahn SB, Kang EO, Bae JM. Epidemiological investigation of a food-borne outbreak in a kindergarten, Jeju Province, Korea. Epidemiol Health 2023; 45:e2023047. [PMID: 37080726 PMCID: PMC10593584 DOI: 10.4178/epih.e2023047] [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: 01/10/2023] [Accepted: 03/17/2023] [Indexed: 04/22/2023] Open
Abstract
OBJECTIVES On Monday, September 6, 2021, at a kindergarten in Jeju Province, a large number of children vomited and developed food poisoning symptoms, and this necessitated an epidemiological investigation. METHODS The team surveyed symptoms and food intake history of kindergarten children, teachers, and workers who ate lunch between September 2 (Thursday) and September 6 (Monday), excluding weekends. In addition to rectal swabs, environmental samples from preserved foods, cooking utensils, drinking water, and refrigerator handles were collected. Pulsed field gel electrophoresis (PFGE) for genetic fingerprint analysis was also performed. RESULTS There were 19 cases among 176 subjects, which indicated an attack rate of 10.8%. The epidemic curve showed a unimodal shape, and the average incubation period was 2.6 hours. While no food was statistically significant in food intake history, the analysis of 35 rectal smear samples detected Bacillus cereus in 7 children, 4 teachers, and 1 cooking staff. Enterotoxins were also detected in 12 samples. Out of 38 environmental samples, B. cereus and enterotoxins were detected in the morning snack cereal, lunch bean sprouts, and afternoon snack steamed potatoes on Monday, September 6th. The result of the PFGE test on 10 isolates of B. cereus showed that there was no genetic homology. CONCLUSIONS Our results indicated that this outbreak was simultaneously caused by various strains of B. cereus from the environment.
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Affiliation(s)
- Kyoung Mi Kim
- Jeju Center for Infectious Diseases Control and Prevention, Jeju, Korea
| | - Eun Suk Cho
- Jeju Center for Infectious Diseases Control and Prevention, Jeju, Korea
| | | | - Eun Ok Kang
- Jeju Special Self-Governing Province Institute of Health and Environment Research, Jeju, Korea
| | - Jong-Myon Bae
- Jeju Center for Infectious Diseases Control and Prevention, Jeju, Korea
- Department of Preventive Medicine, Jeju National University College of Medicine, Jeju, Korea
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3
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Preclinical Safety Assessment of Bacillus subtilis BS50 for Probiotic and Food Applications. Microorganisms 2022; 10:microorganisms10051038. [PMID: 35630480 PMCID: PMC9144164 DOI: 10.3390/microorganisms10051038] [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: 04/19/2022] [Revised: 05/11/2022] [Accepted: 05/13/2022] [Indexed: 12/12/2022] Open
Abstract
Despite the commercial rise of probiotics containing Bacillaceae spp., it remains important to assess the safety of each strain before clinical testing. Herein, we performed preclinical analyses to address the safety of Bacillus subtilis BS50. Using in silico analyses, we screened the 4.15 Mbp BS50 genome for genes encoding known Bacillus toxins, secondary metabolites, virulence factors, and antibiotic resistance. We also assessed the effects of BS50 lysates on the viability and permeability of cultured human intestinal epithelial cells (Caco-2). We found that the BS50 genome does not encode any known Bacillus toxins. The BS50 genome contains several gene clusters involved in the biosynthesis of secondary metabolites, but many of these antimicrobial metabolites (e.g., fengycin) are common to Bacillus spp. and may even confer health benefits related to gut microbiota health. BS50 was susceptible to seven of eight commonly prescribed antibiotics, and no antibiotic resistance genes were flanked by the complete mobile genetic elements that could enable a horizontal transfer. In cell culture, BS50 cell lysates did not diminish either Caco-2 viability or monolayer permeability. Altogether, BS50 exhibits a robust preclinical safety profile commensurate with commercial probiotic strains and likely poses no significant health risk to humans.
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4
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To HTA, Chhetri V, Settachaimongkon S, Prakitchaiwattana C. Stress tolerance-Bacillus with a wide spectrum bacteriocin as an alternative approach for food bio-protective culture production. Food Control 2022. [DOI: 10.1016/j.foodcont.2021.108598] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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5
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Witty M. Examples of potato epidermis endophytes and rhizosphere microbes that may be human pathogens contributing to potato peel colic. ACTA ALIMENTARIA 2022. [DOI: 10.1556/066.2021.00157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Abstract
Potato tubers defend themselves against herbivores with endogenous secondary compounds such as solanine and scopolamine. They also recruit endophytes and members of the tuberosphere to repel herbivores. Many of these endophyte defence features are overcome by cooking, with some notable exceptions that have been identified by rDNA analysis of potato peel samples and may account for some previously unrecognised features of potato peel colic. This is relevant regarding the rather modern way of cooking, where the potato peel is left intact in food and consumed.
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Affiliation(s)
- M. Witty
- Math and Science Department, School of Pure and Applied Sciences, Florida SouthWestern State College, 8099 College Parkway, Fort Myers, Florida 33919, USA
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6
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Todorov SD, Ivanova IV, Popov I, Weeks R, Chikindas ML. Bacillus spore-forming probiotics: benefits with concerns? Crit Rev Microbiol 2021; 48:513-530. [PMID: 34620036 DOI: 10.1080/1040841x.2021.1983517] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Representatives of the genus Bacillus are multifunctional microorganisms with a broad range of applications in both traditional fermentation and modern biotechnological processes. Bacillus spp. has several beneficial properties. They serve as starter cultures for various traditional fermented foods and are important biotechnological producers of enzymes, antibiotics, and bioactive peptides. They are also used as probiotics for humans, in veterinary medicine, and as feed additives for animals of agricultural importance. The beneficial effects of bacilli are well-reported and broadly acknowledged. However, with a better understanding of their positive role, many questions have been raised regarding their safety and the relevance of spore formation in the practical application of this group of microorganisms. What is the role of Bacillus spp. in the human microbial consortium? When and why did they start colonizing the gastrointestinal tract (GIT) of humans and other animals? Can spore-forming probiotics be considered as truly beneficial organisms, or should they still be approached with caution and regarded as "benefits with concerns"? In this review, we not only hope to answer the above questions but to expand the scope of the conversation surrounding bacilli probiotics.
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Affiliation(s)
| | - Iskra Vitanova Ivanova
- Department of General and Applied Microbiology, Faculty of Biology, Sofia University St. Kliment Ohridski, Sofia, Bulgaria
| | - Igor Popov
- Center for Agrobiotechnology, Don State Technical University, Rostov-on-Don, Russia
| | - Richard Weeks
- Health Promoting Naturals Laboratory, School of Environmental and Biological Sciences, Rutgers State University, New Brunswick, NJ, USA
| | - Michael Leonidas Chikindas
- Center for Agrobiotechnology, Don State Technical University, Rostov-on-Don, Russia.,Health Promoting Naturals Laboratory, School of Environmental and Biological Sciences, Rutgers State University, New Brunswick, NJ, USA.,I.M. Sechenov First Moscow State Medical University, Moscow, Russia
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Picon A, Del Olmo A, Nuñez M. Bacterial diversity in six species of fresh edible seaweeds submitted to high pressure processing and long-term refrigerated storage. Food Microbiol 2020; 94:103646. [PMID: 33279071 DOI: 10.1016/j.fm.2020.103646] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Revised: 09/11/2020] [Accepted: 09/15/2020] [Indexed: 02/06/2023]
Abstract
Seaweeds are highly perishable foods due to their richness in nutrients. High pressure processing (HPP) has been applied for extending the shelf life of fresh seaweeds but there is no information on the effect of HPP on the bacterial diversity of seaweeds. The culturable bacteria of six species of fresh edible seaweeds (green seaweeds Codium fragile and Ulva lactuca, brown seaweeds Himanthalia elongata, Laminaria ochroleuca and Undaria pinnatifida, and red seaweed Chondrus crispus) were investigated and compared to those of HPP-treated (400 and 600 MPa for 5 min) seaweeds, at the start and end of their refrigerated storage period. A total of 523 and 506 bacterial isolates were respectively retrieved from untreated and HPP-treated seaweeds. Isolates from untreated seaweeds belonged to 18 orders, 35 families, 71 genera and 135 species whereas isolates from HPP-treated seaweeds belonged to 13 orders, 23 families, 43 genera and 103 species. HPP treatment significantly reduced the number of isolates belonging to 6 families and greatly increased the number of Bacillaceae isolates. At the end of storage, decreases in bacterial diversity at the genus and species level were observed for untreated as well as for HPP-treated seaweeds.
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Affiliation(s)
- Antonia Picon
- INIA, Departamento de Tecnología de Alimentos, Carretera de La Coruña Km 7, 28040, Madrid, Spain.
| | - Ana Del Olmo
- INIA, Departamento de Tecnología de Alimentos, Carretera de La Coruña Km 7, 28040, Madrid, Spain
| | - Manuel Nuñez
- INIA, Departamento de Tecnología de Alimentos, Carretera de La Coruña Km 7, 28040, Madrid, Spain
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8
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Abe H, Koyama K, Takeoka K, Doto S, Koseki S. Describing the Individual Spore Variability and the Parameter Uncertainty in Bacterial Survival Kinetics Model by Using Second-Order Monte Carlo Simulation. Front Microbiol 2020; 11:985. [PMID: 32508792 PMCID: PMC7248279 DOI: 10.3389/fmicb.2020.00985] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2020] [Accepted: 04/23/2020] [Indexed: 11/13/2022] Open
Abstract
The objective of this study was to separately describe the fitting uncertainty and the variability of individual cell in bacterial survival kinetics during isothermal and non-isothermal thermal processing. The model describing bacterial survival behavior and its uncertainties and variabilities during non-isothermal inactivation was developed from survival kinetic data for Bacillus simplex spores under fifteen isothermal conditions. The fitting uncertainties in the parameters used in the primary Weibull model was described by using the bootstrap method. The variability of individual cells in thermotolerance and the true randomness in the number of dead cells were described by using the Markov chain Monte Carlo (MCMC) method. A second-order Monte Carlo (2DMC) model was developed by combining both the uncertainties and variabilities. The 2DMC model was compared with reduction behavior under three non-isothermal profiles for model validation. The bacterial death estimations were validated using experimentally observed surviving bacterial count data. The fitting uncertainties in the primary Weibull model parameters, the individual thermotolerance heterogeneity, and the true randomness of inactivated spore counts were successfully described under all the iso-thermal conditions. Furthermore, the 2DMC model successfully described the variances in the surviving bacterial counts during thermal inactivation for all three non-isothermal profiles. As a template for risk-based process designs, the proposed 2DMC simulation approach, which considers both uncertainty and variability, can facilitate the selection of appropriate thermal processing conditions ensuring both food safety and quality.
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Affiliation(s)
- Hiroki Abe
- Graduate School of Agriculture Science, Hokkaido University, Sapporo, Japan
| | - Kento Koyama
- Graduate School of Agriculture Science, Hokkaido University, Sapporo, Japan
| | - Kohei Takeoka
- Graduate School of Agriculture Science, Hokkaido University, Sapporo, Japan
| | - Shinya Doto
- Graduate School of Agriculture Science, Hokkaido University, Sapporo, Japan
| | - Shigenobu Koseki
- Graduate School of Agriculture Science, Hokkaido University, Sapporo, Japan
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9
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Nakano M. Development of a multiplex real-time PCR assay for the identification and quantification of group-specific Bacillus spp. and the genus Paenibacillus. Int J Food Microbiol 2020; 323:108573. [DOI: 10.1016/j.ijfoodmicro.2020.108573] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2019] [Revised: 02/24/2020] [Accepted: 02/26/2020] [Indexed: 11/30/2022]
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10
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Whole Genome Sequencing and Comparative Genomics of Two Nematicidal Bacillus Strains Reveals a Wide Range of Possible Virulence Factors. G3-GENES GENOMES GENETICS 2020; 10:881-890. [PMID: 31919110 PMCID: PMC7056983 DOI: 10.1534/g3.119.400716] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Bacillus firmus nematicidal bacterial strains are used to control plant parasitic nematode infestation of crops in agricultural production. Proteases are presumed to be the primary nematode virulence factors in nematicidal B. firmus degrading the nematode cuticle and other organs. We determined and compared the whole genome sequences of two nematicidal strains. Comparative genomics with a particular focus on possible virulence determinants revealed a wider range of possible virulence factors in a B. firmus isolate from a commercial bionematicide and a wild type Bacillus sp. isolate with nematicidal activity. The resulting 4.6 Mb B. firmus I-1582 and 5.3 Mb Bacillus sp. ZZV12-4809 genome assemblies contain respectively 18 and 19 homologs to nematode-virulent proteases, two nematode-virulent chitinase homologs in ZZV12-4809 and 28 and 36 secondary metabolite biosynthetic clusters, projected to encode antibiotics, small peptides, toxins and siderophores. The results of this study point to the genetic capability of B. firmus and related species for nematode virulence through a range of direct and indirect mechanisms.
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Abstract
Water is one of the most important substances on earth and without it life cannot exist. However, poor water quality in many parts of the world has increased the number of water-related diseases, making it the leading cause of disease and death globally for both young and old. Waterborne pathogens cause diseases in humans through two major exposure pathways: drinking water and recreational waters. This chapter on waterborne pathogens will be starting with an introduction, followed by descriptions on classical waterborne pathogens; bacteria, viruses, protozoans, and helminths placing emphasis on the World Health Organization guidelines. Further to conventional waterborne pathogens, fresh organisms and new strains from already known pathogens are being identified and that present important additional challenges to both the water and public health sectors. Hence later part of the chapter focuses on the potential waterborne pathogens and will conclude with a summary of the content.
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Affiliation(s)
- D.N. Magana-Arachchi
- Molecular Microbiology & Human Diseases Unit, National Institute of Fundamental Studies, Kandy, Sri Lanka
| | - R.P. Wanigatunge
- Department of Plant and Molecular Biology, University of Kelaniya, Kelaniya, Sri Lanka
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12
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Insights into Antagonistic Interactions of Multidrug Resistant Bacteria in Mangrove Sediments from the South Indian State of Kerala. Microorganisms 2019; 7:microorganisms7120678. [PMID: 31835720 PMCID: PMC6956087 DOI: 10.3390/microorganisms7120678] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2019] [Revised: 12/06/2019] [Accepted: 12/09/2019] [Indexed: 01/28/2023] Open
Abstract
Antibiotic resistance is a global issue which is magnified by interspecies horizontal gene transfer. Understanding antibiotic resistance in bacteria in a natural setting is crucial to check whether they are multidrug resistant (MDR) and possibly avoid outbreaks. In this study, we have isolated several antibiotic-resistant bacteria (ARB) (n = 128) from the mangroves in Kerala, India. ARBs were distributed based on antibiotics (p = 1.6 × 10-5). The 16S rRNA gene characterization revealed dominance by Bacillaceae (45%), Planococcaceae (22.5%), and Enterobacteriaceae (17.5%). A high proportion of the isolates were MDR (75%) with maximum resistance to methicillin (70%). Four isolates affiliated to plant-growth promoters, probiotics, food, and human pathogens were resistant to all antibiotics indicating the seriousness and prevalence of MDR. A significant correlation (R = 0.66; p = 2.5 × 10-6) was observed between MDR and biofilm formation. Antagonist activity was observed in 62.5% isolates. Gram-positive isolates were more susceptible to antagonism (75.86%) than gram-negative (36.36%) isolates. Antagonism interactions against gram-negative isolates were lower (9.42%) when compared to gram-positive isolates (89.85%). Such strong antagonist activity can be harnessed for inspection of novel antimicrobial mechanisms and drugs. Our study shows that MDR with strong biofilm formation is prevalent in natural habitat and if acquired by deadly pathogens may create havoc in public health.
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13
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Li F, Hunt K, Van Hoorde K, Butler F, Jordan K, Tobin JT. Occurrence and identification of spore-forming bacteria in skim-milk powders. Int Dairy J 2019. [DOI: 10.1016/j.idairyj.2019.05.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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14
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Mingmongkolchai S, Panbangred W. Bacillus probiotics: an alternative to antibiotics for livestock production. J Appl Microbiol 2018; 124:1334-1346. [PMID: 29316021 DOI: 10.1111/jam.13690] [Citation(s) in RCA: 173] [Impact Index Per Article: 28.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2017] [Revised: 12/16/2017] [Accepted: 12/29/2017] [Indexed: 12/16/2022]
Abstract
The use of probiotics as feed supplements in animal production has increased considerably over the last decade, particularly since the ban on antibiotic growth promoters in the livestock sector. Several Bacillus sp. are attractive for use as probiotic supplements in animal feed due to their ability to produce spores. Their heat stability and ability to survive the low pH of the gastric barrier represent an advantage over other probiotic micro-organisms. This review discusses important characteristics required for selection of Bacillus probiotic strains and summarizes the beneficial effect of Bacillus-based feed additives on animal production. Although the mechanism of action of Bacillus probiotics has not been fully elucidated, they are effective in improving the growth, survival and health status of terrestrial and aquatic livestock. Bacillus strains also have utility in bioremediation and can reduce nitrogenous waste, thereby improving environmental conditions and water quality. Finally, recent innovative approaches for using Bacillus spores in various applications are discussed.
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Affiliation(s)
- S Mingmongkolchai
- Department of Biotechnology, Faculty of Science, Mahidol University, Bangkok, Thailand.,Faculty of Science, Mahidol University-Osaka University Collaborative Research Center for Bioscience and Biotechnology (MU-OU:CRC), Mahidol University, Bangkok, Thailand
| | - W Panbangred
- Department of Biotechnology, Faculty of Science, Mahidol University, Bangkok, Thailand.,Faculty of Science, Mahidol University-Osaka University Collaborative Research Center for Bioscience and Biotechnology (MU-OU:CRC), Mahidol University, Bangkok, Thailand
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15
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Hohmann HP, van Dijl JM, Krishnappa L, Prágai Z. Host Organisms:Bacillus subtilis. Ind Biotechnol (New Rochelle N Y) 2016. [DOI: 10.1002/9783527807796.ch7] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Affiliation(s)
- Hans-Peter Hohmann
- Nutrition Innovation Center R&D Biotechnology; DSM Nutritional Products Ltd; Wurmisweg 576 CH-4303 Kaiseraugst Switzerland
| | - Jan M. van Dijl
- University of Groningen, University Medical Center Groningen; Department of Medical Microbiology; Hanzeplein 1 9700 RB Groningen The Netherlands
| | - Laxmi Krishnappa
- University of Groningen, University Medical Center Groningen; Department of Medical Microbiology; Hanzeplein 1 9700 RB Groningen The Netherlands
| | - Zoltán Prágai
- Nutrition Innovation Center R&D Biotechnology; DSM Nutritional Products Ltd; Wurmisweg 576 CH-4303 Kaiseraugst Switzerland
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16
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Zheng Y, Xi X, Xu H, Hou Q, Bian Y, Yu Z, Kwok LY, Zhang W, Sun Z, Zhang H. Using PacBio Long-Read High-Throughput Microbial Gene Amplicon Sequencing To Evaluate Infant Formula Safety. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2016; 64:6993-7001. [PMID: 27500310 DOI: 10.1021/acs.jafc.6b01817] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Infant formula (IF) requires a strict microbiological standard because of the high vulnerability of infants to foodborne diseases. The current study used the PacBio single-molecule real-time (SMRT) sequencing platform to generate full-length 16S rRNA-based bacterial microbiota profiles of 30 Chinese domestic and imported IF samples. A total of 600 species were identified, dominated by Streptococcus thermophilus, Lactococcus lactis, and Lactococcus piscium. Distinctive bacterial profiles were observed between the two sample groups, as confirmed with both principal coordinate analysis and multivariate analysis of variance. Moreover, the product whey protein nitrogen index (WPNI), representing the degree of preheating, negatively correlated with the relative abundances of the Bacillus genus. This study has demonstrated the application of the PacBio SMRT sequencing platform in assessing the bacterial contamination of IF products, which is of interest to the dairy industry for effective monitoring of microbial quality and safety during production.
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Affiliation(s)
- Yi Zheng
- Key Laboratory of Dairy Biotechnology and Engineering, Inner Mongolia Agricultural University , Hohhot 010018, People's Republic of China
| | - Xiaoxia Xi
- Key Laboratory of Dairy Biotechnology and Engineering, Inner Mongolia Agricultural University , Hohhot 010018, People's Republic of China
| | - Haiyan Xu
- Key Laboratory of Dairy Biotechnology and Engineering, Inner Mongolia Agricultural University , Hohhot 010018, People's Republic of China
| | - Qiangchuan Hou
- Key Laboratory of Dairy Biotechnology and Engineering, Inner Mongolia Agricultural University , Hohhot 010018, People's Republic of China
| | - Yanfei Bian
- Key Laboratory of Dairy Biotechnology and Engineering, Inner Mongolia Agricultural University , Hohhot 010018, People's Republic of China
| | - Zhongjie Yu
- Key Laboratory of Dairy Biotechnology and Engineering, Inner Mongolia Agricultural University , Hohhot 010018, People's Republic of China
| | - Lai-Yu Kwok
- Key Laboratory of Dairy Biotechnology and Engineering, Inner Mongolia Agricultural University , Hohhot 010018, People's Republic of China
| | - Wenyi Zhang
- Key Laboratory of Dairy Biotechnology and Engineering, Inner Mongolia Agricultural University , Hohhot 010018, People's Republic of China
| | - Zhihong Sun
- Key Laboratory of Dairy Biotechnology and Engineering, Inner Mongolia Agricultural University , Hohhot 010018, People's Republic of China
| | - Heping Zhang
- Key Laboratory of Dairy Biotechnology and Engineering, Inner Mongolia Agricultural University , Hohhot 010018, People's Republic of China
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Gopal N, Hill C, Ross PR, Beresford TP, Fenelon MA, Cotter PD. The Prevalence and Control of Bacillus and Related Spore-Forming Bacteria in the Dairy Industry. Front Microbiol 2015; 6:1418. [PMID: 26733963 PMCID: PMC4685140 DOI: 10.3389/fmicb.2015.01418] [Citation(s) in RCA: 147] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2015] [Accepted: 11/30/2015] [Indexed: 01/14/2023] Open
Abstract
Milk produced in udder cells is sterile but due to its high nutrient content, it can be a good growth substrate for contaminating bacteria. The quality of milk is monitored via somatic cell counts and total bacterial counts, with prescribed regulatory limits to ensure quality and safety. Bacterial contaminants can cause disease, or spoilage of milk and its secondary products. Aerobic spore-forming bacteria, such as those from the genera Sporosarcina, Paenisporosarcina, Brevibacillus, Paenibacillus, Geobacillus and Bacillus, are a particular concern in this regard as they are able to survive industrial pasteurization and form biofilms within pipes and stainless steel equipment. These single or multiple-species biofilms become a reservoir of spoilage microorganisms and a cycle of contamination can be initiated. Indeed, previous studies have highlighted that these microorganisms are highly prevalent in dead ends, corners, cracks, crevices, gaskets, valves and the joints of stainless steel equipment used in the dairy manufacturing plants. Hence, adequate monitoring and control measures are essential to prevent spoilage and ensure consumer safety. Common controlling approaches include specific cleaning-in-place processes, chemical and biological biocides and other novel methods. In this review, we highlight the problems caused by these microorganisms, and discuss issues relating to their prevalence, monitoring thereof and control with respect to the dairy industry.
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Affiliation(s)
- Nidhi Gopal
- Teagasc Food Research CentreCork, Ireland
- School of Microbiology, University College CorkCork, Ireland
| | - Colin Hill
- School of Microbiology, University College CorkCork, Ireland
- APC Microbiome InstituteCork, Ireland
| | - Paul R. Ross
- College of Science, Engineering and Food Science, University College CorkCork, Ireland
| | | | | | - Paul D. Cotter
- Teagasc Food Research CentreCork, Ireland
- APC Microbiome InstituteCork, Ireland
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18
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Sadiq FA, Li Y, Liu T, Flint S, Zhang G, He G. A RAPD based study revealing a previously unreported wide range of mesophilic and thermophilic spore formers associated with milk powders in China. Int J Food Microbiol 2015; 217:200-8. [PMID: 26555161 DOI: 10.1016/j.ijfoodmicro.2015.10.030] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2015] [Revised: 10/03/2015] [Accepted: 10/31/2015] [Indexed: 11/26/2022]
Abstract
Aerobic spore forming bacteria are potential milk powder contaminants and are viewed as indicators of poor quality. A total of 738 bacteria, including both mesophilic and thermophilic, isolated from twenty-five powdered milk samples representative of three types of milk powders in China were analyzed based on the random amplified polymorphic DNA (RAPD) protocol to provide insight into species diversity. Bacillus licheniformis was found to be the most prevalent bacterium with greatest diversity (~43% of the total isolates) followed by Geobacillus stearothermophilus (~21% of the total isolates). Anoxybacillus flavithermus represented only 8.5% of the total profiles. Interestingly, actinomycetes represented a major group of the isolates with the predominance of Laceyella sacchari followed by Thermoactinomyces vulgaris, altogether comprising of 7.3% of the total isolates. Out of the nineteen separate bacterial species (except five unidentified groups) recovered and identified from milk powders, twelve proved to belong to novel or previously unreported species in milk powders. Assessment and characterization of the harmful effects caused by this particular micro-flora on the quality and safety of milk powders will be worth doing in the future.
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Affiliation(s)
- Faizan A Sadiq
- College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China
| | - Yun Li
- Department of Biology, Hanshan Normal University, Chaozhou 521041, China
| | - TongJie Liu
- College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China
| | - Steve Flint
- School of Food and Nutrition, Massey University, Private Bag 11 222, Palmerston-North, New Zealand
| | - Guohua Zhang
- College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China
| | - GuoQing He
- College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China.
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19
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Lee ES, Park SY, Ha SD. Effect of UV-C light on the microbial and sensory quality of seasoned dried seafood. FOOD SCI TECHNOL INT 2015; 22:213-20. [PMID: 25967394 DOI: 10.1177/1082013215586293] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2014] [Accepted: 04/15/2015] [Indexed: 11/17/2022]
Abstract
This study investigated the effects of different doses of UV-C light at 253.7 nm (0-18 kJ/m(2)) on the reduction of Escherichia coli,Staphylococcus aureus and Bacillus cereus in contaminated seasoned dried filefish (Thamnaconus modestus) and sliced squid (Todarodes pacificus) surfaces and sensory quality. The counts of all three bacteria were significantly (P < 0.05) reduced by the increase of UV-C dosage.E. coli,S. aureus and B. cereus on filefish with 18 kJ/m(2)of UV-C maximally reduced by 2.70, 2.55 and 2.57 log CFU/g, respectively; however, on the sliced squid using the same UV dose reduced the same bacteria by 1.35, 0.54 and 1.05 log CFU/g, respectively. However, the results suggest that 6 to 9 kJ/m(2)of UV-C could be used for the inactivation of E. coli and B. cereus in these dried fishery products without any changes in sensory quality. However, S. aureus levels on sliced squid will require a combination of UV-C light and chemical treatment.
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Affiliation(s)
- Eun-Seon Lee
- School of Food Science and Technology, Chung-Ang University, Ansung, Republic of Korea
| | - Shin Young Park
- School of Food Science and Technology, Chung-Ang University, Ansung, Republic of Korea
| | - Sang-Do Ha
- School of Food Science and Technology, Chung-Ang University, Ansung, Republic of Korea
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20
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Analysis of emetic toxin production by Bacillus species using cellular cytotoxicity, molecular, and chromatographic assays. BIOTECHNOL BIOPROC E 2015. [DOI: 10.1007/s12257-014-0574-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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21
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De Bellis P, Minervini F, Di Biase M, Valerio F, Lavermicocca P, Sisto A. Toxigenic potential and heat survival of spore-forming bacteria isolated from bread and ingredients. Int J Food Microbiol 2014; 197:30-9. [PMID: 25555227 DOI: 10.1016/j.ijfoodmicro.2014.12.017] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2014] [Revised: 10/16/2014] [Accepted: 12/14/2014] [Indexed: 11/24/2022]
Abstract
Fifty-four spore-forming bacterial strains isolated from bread ingredients and bread, mainly belonging to the genus Bacillus (including Bacillus cereus), together with 11 reference strains were investigated to evaluate their cytotoxic potential and heat survival in order to ascertain if they could represent a risk for consumer health. Therefore, we performed a screening test of cytotoxic activity on HT-29 cells using bacterial culture filtrates after growing bacterial cells in Brain Heart Infusion medium and in the bread-based medium Bread Extract Broth (BEB). Moreover, immunoassays and PCR analyses, specifically targeting already known toxins and related genes of B. cereus, as well as a heat spore inactivation assay were carried out. Despite of strain variability, the results clearly demonstrated a high cytotoxic activity of B. cereus strains, even if for most of them it was significantly lower in BEB medium. Cytotoxic activity was also detected in 30% of strains belonging to species different from B. cereus, although, with a few exceptions (e.g. Bacillus simplex N58.2), it was low or very low. PCR analyses detected the presence of genes involved in the production of NHE, HBL or CytK toxins in B. cereus strains, while genes responsible for cereulide production were not detected. Production of NHE and HBL toxins was also confirmed by specific immunoassays only for B. cereus strains even if PCR analyses revealed the presence of related toxin genes also in some strains of other species. Viable spore count was ascertained after a heat treatment simulating the bread cooking process. Results indicated that B. amyloliquefaciens strains almost completely survived the heat treatment showing less than 2 log-cycle reductions similarly to two strains of B. cereus group III and single strains belonging to Bacillus subtilis, Bacillus mojavensis and Paenibacillus spp. Importantly, spores from strains of the B. cereus group IV exhibited a thermal resistance markedly lower than B. cereus group III with high values of log-cycle reductions. In conclusion, our results indicate that spore-forming bacteria contaminating bread ingredients and bread could represent a source of concern for consumer health related to the presence of strains, such as strains of B. cereus group III and single strains of other species, showing the ability to produce toxic substances associated to a thermal resistance enough to survive the bread cooking conditions.
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Affiliation(s)
- Palmira De Bellis
- Institute of Sciences of Food Production, National Research Council, Via Amendola 122/O, 70126 Bari, Italy
| | - Fiorenza Minervini
- Institute of Sciences of Food Production, National Research Council, Via Amendola 122/O, 70126 Bari, Italy
| | - Mariaelena Di Biase
- Institute of Sciences of Food Production, National Research Council, Via Amendola 122/O, 70126 Bari, Italy
| | - Francesca Valerio
- Institute of Sciences of Food Production, National Research Council, Via Amendola 122/O, 70126 Bari, Italy
| | - Paola Lavermicocca
- Institute of Sciences of Food Production, National Research Council, Via Amendola 122/O, 70126 Bari, Italy
| | - Angelo Sisto
- Institute of Sciences of Food Production, National Research Council, Via Amendola 122/O, 70126 Bari, Italy.
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22
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Pérez Pulido R, Toledo J, Grande MJ, Gálvez A, Lucas R. Analysis of the effect of high hydrostatic pressure treatment and enterocin AS-48 addition on the bacterial communities of cherimoya pulp. Int J Food Microbiol 2014; 196:62-9. [PMID: 25528726 DOI: 10.1016/j.ijfoodmicro.2014.11.033] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2014] [Revised: 11/22/2014] [Accepted: 11/29/2014] [Indexed: 12/21/2022]
Abstract
In the present study, pulp obtained from cherimoya pulp (Annona cherimola) was inoculated with epiphytic microbiota collected from cherimoya fruits, and supplemented or not with the circular bacteriocin enterocin AS-48 (50μg/g) and then packed under vacuum. Samples supplemented or not with enterocin were treated by high hydrostatic pressure (600MPa, 8min) and then stored at 5°C for 30days. The single AS-48 treatment only delayed microbial growth non-significantly (p>0.05). HHP treatment reduced microbial counts by five log cycles, but it did not prevent further growth of survivors by day 7. The combined treatment (AS-48+HHP) was the most effective, keeping bacterial cell densities at ≤1.5 log CFU/g for up to 15days. 16S rRNA gene pyrosequencing analysis was done on amplicon libraries from the growth on TSA plates seeded with ten-fold dilutions of pulp suspensions and incubated at 22°C for 24h. The results obtained are limited by the experimental conditions used in the study, and only concern the bacterial fraction that was selected by the TSA and growth conditions used. Pantoea (Pantoea agglomerans, Pantoea vagans) were the operational taxonomic units (OTUs) detected at highest relative abundance in bacterial biomass grown from control samples for the first 7days of storage, followed by Enterococcus gallinarum and Leuconostoc mesenteroides during late storage. The single HHP treatment significantly reduced the relative abundance of OTUs belonging to Pantoea and strongly increased that of endosporeformers (mainly Bacillus firmus and Bacillus stratosphericus) early after treatment, although Pantoea became again the predominant OTUs during storage. Samples singly treated with enterocin AS-48 revealed a strong inhibition of E. gallinarum as well as an early decrease in the relative abundance of Pantoea and an increased relative abundance of OTUs belonging to other Gram-negative species (mainly from genera Serratia and Pseudomonas). The strong microbial inactivation achieved by the combined treatment with enterocin and HHP reduced the levels of viable cells below detectable limits at days 0 and 1, and survivors recovered on TSA at day 7 were represented in >99% by B. firmus OTU. OTUs from endosporeformers were no longer detected during prolonged incubation, displaced by Pantoea spp., Erwinia billingiae and leuconostocs. Results from the present study indicate that HHP in combination with enterocin AS-48 is more effective in preserving the microbiological quality of cherimoya pulp during storage than the single HHP treatment.
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Affiliation(s)
- Rubén Pérez Pulido
- Área de Microbiología, Departamento de Ciencias de la Salud, Facultad de Ciencias Experimentales, Universidad de Jaén, 23071-Jaén, Spain
| | - Julia Toledo
- Área de Microbiología, Departamento de Ciencias de la Salud, Facultad de Ciencias Experimentales, Universidad de Jaén, 23071-Jaén, Spain
| | - M José Grande
- Área de Microbiología, Departamento de Ciencias de la Salud, Facultad de Ciencias Experimentales, Universidad de Jaén, 23071-Jaén, Spain
| | - Antonio Gálvez
- Área de Microbiología, Departamento de Ciencias de la Salud, Facultad de Ciencias Experimentales, Universidad de Jaén, 23071-Jaén, Spain.
| | - Rosario Lucas
- Área de Microbiología, Departamento de Ciencias de la Salud, Facultad de Ciencias Experimentales, Universidad de Jaén, 23071-Jaén, Spain
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23
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Guidance on the assessment of the toxigenic potential of Bacillus species used in animal nutrition. EFSA J 2014. [DOI: 10.2903/j.efsa.2014.3665] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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24
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Wang J, Ding T, Oh DH. Effect of Temperatures on the Growth, Toxin Production, and Heat Resistance of Bacillus cereus in Cooked Rice. Foodborne Pathog Dis 2014; 11:133-7. [DOI: 10.1089/fpd.2013.1609] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Affiliation(s)
- Jun Wang
- Department of Food Science and Biotechnology and Institute of Bioscience and Biotechnology, Kangwon National University, Gangwon, Korea
| | - Tian Ding
- Department of Food Science and Nutrition, School of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou, China
| | - Deog-Hwan Oh
- Department of Food Science and Biotechnology and Institute of Bioscience and Biotechnology, Kangwon National University, Gangwon, Korea
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25
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Faille C, Ronse A, Dewailly E, Slomianny C, Maes E, Krzewinski F, Guerardel Y. Presence and function of a thick mucous layer rich in polysaccharides around Bacillus subtilis spores. BIOFOULING 2014; 30:845-858. [PMID: 25115519 DOI: 10.1080/08927014.2014.939073] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
This study was designed to establish the presence and function of the mucous layer surrounding spores of Bacillus subtilis. First, an external layer of variable thickness and regularity was often observed on B. subtilis spores. Further analyses were performed on B. subtilis 98/7 spores surrounded by a thick layer. The mechanical removal of the layer did not affect their resistance to heat or their ability to germinate but rendered the spore less hydrophilic, more adherent to stainless steel, and more resistant to cleaning. This layer was mainly composed of 6-deoxyhexoses, ie rhamnose, 3-O-methyl-rhamnose and quinovose, but also of glucosamine and muramic lactam, known also to be a part of the bacterial peptidoglycan. The specific hydrolysis of the peptidoglycan using lysozyme altered the structure of the required mucous layer and affected the physico-chemical properties of the spores. Such an outermost mucous layer has also been seen on spores of B. licheniformis and B. clausii isolated from food environments.
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Affiliation(s)
- Christine Faille
- a INRA, UR638 Interface Processes and Hygiene of Materials , F-59651 Villeneuve d'Ascq , France
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26
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Lücking G, Stoeckel M, Atamer Z, Hinrichs J, Ehling-Schulz M. Characterization of aerobic spore-forming bacteria associated with industrial dairy processing environments and product spoilage. Int J Food Microbiol 2013; 166:270-9. [DOI: 10.1016/j.ijfoodmicro.2013.07.004] [Citation(s) in RCA: 122] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2013] [Revised: 07/03/2013] [Accepted: 07/07/2013] [Indexed: 11/30/2022]
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27
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Madslien EH, Rønning HT, Lindbäck T, Hassel B, Andersson MA, Granum PE. Lichenysin is produced by most Bacillus licheniformis strains. J Appl Microbiol 2013; 115:1068-80. [PMID: 23844764 DOI: 10.1111/jam.12299] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2013] [Revised: 07/01/2013] [Accepted: 07/03/2013] [Indexed: 11/28/2022]
Abstract
AIMS The aim of this study was to elucidate the prevalence of lichenysin production in Bacillus licheniformis and to see whether this feature was restricted to certain genotypes. Secondly, we wanted to see whether cytotoxicity reflected the measured levels of lichenysin. METHODS AND RESULTS Fifty-three genotyped strains of B. licheniformis, representing a wide variety of sources, were included. lchAA gene fragments were detected in all strains by polymerase chain reaction (PCR). All 53 strains produced lichenysins with four molecular masses as confirmed by LC-MS/MS (liquid chromatography-tandem mass spectrometry) analysis. The amounts of lichenysin varied more than two orders of magnitude between strains and were irrespective of genotype. Finally, there was a strong association between lichenysin concentrations and toxicity towards boar spermatozoa, erythrocytes and Vero cells. CONCLUSIONS Lichenysin synthesis was universal among the 53 B. licheniformis strains examined. The quantities varied considerably between strains, but were not specifically associated with genotype. Cytotoxicity was evident at lichenysin concentrations above 10 μg ml(-1) , which is in accordance with previous studies. SIGNIFICANCE AND IMPACT OF STUDY This study might be of interest to those working on B. licheniformis for commercial use as well as for authorities who make risk assessments of B. licheniformis when used as a food and feed additive.
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Affiliation(s)
- E H Madslien
- Forsvarets Forskningsinstitutt FFI, Norwegian Defence Research Establishment, Kjeller, Norway; Department of Food Safety and Infection Biology, Section for Food Safety, Norwegian School of Veterinary Science, Oslo, Norway
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28
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Abstract
Species of Bacillus and related genera have long been troublesome to food producers on account of their resistant endospores. These organisms have undergone huge taxonomic changes in the last 30 years, with numbers of genera and species now standing at 56 and over 545, respectively. Despite this expansion, relatively few new species have been isolated from infections, few are associated with food and no important new agents of foodborne illness have been reported. What has changed is our knowledge of the established agents. Bacillus cereus is well known as a cause of food poisoning, and much more is now understood about its toxins and their involvement in infections and intoxications. Also, although B. licheniformis, B. subtilis and B. pumilus have occasionally been isolated from cases of food-associated illness, their roles were usually uncertain. Much more is now known about the toxins that strains of these species may produce, so that their significances in such episodes are clearer; however, it is still unclear why such cases are so rarely reported. Another important development is the use of aerobic endosporeformers as probiotics, as the potentials of such organisms to cause illness or to be sources of antibiotic resistance need to be borne in mind.
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Affiliation(s)
- N A Logan
- Department of Life Sciences, Glasgow Caledonian University, Cowcaddens Road, Glasgow, UK.
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29
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LIU ZHIGUO, FANG GUOLIANG, LI QI, ZHOU GUOPING, LI RUI, FU YUNJIE, LI HE, QU SHEN. DETECTION OF BACILLUS CEREUS CONTAINING VOITOXIN IN FOOD BY LOOP-MEDIATED ISOTHERMAL AMPLIFICATION METHOD. J Food Saf 2011. [DOI: 10.1111/j.1745-4565.2011.00302.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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30
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Coton M, Denis C, Cadot P, Coton E. Biodiversity and characterization of aerobic spore-forming bacteria in surimi seafood products. Food Microbiol 2011; 28:252-60. [DOI: 10.1016/j.fm.2010.03.017] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2009] [Revised: 03/19/2010] [Accepted: 03/24/2010] [Indexed: 11/26/2022]
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31
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Evaluation of phenotypic and PCR-based approaches for routine analysis of Bacillus cereus group foodborne isolates. Antonie van Leeuwenhoek 2010; 99:697-709. [DOI: 10.1007/s10482-010-9545-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2010] [Accepted: 12/10/2010] [Indexed: 10/18/2022]
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32
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Kim JB, Kim JM, Kim SY, Kim JH, Park YB, Choi NJ, Oh DH. Comparison of enterotoxin production and phenotypic characteristics between emetic and enterotoxic Bacillus cereus. J Food Prot 2010; 73:1219-24. [PMID: 20615333 DOI: 10.4315/0362-028x-73.7.1219] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Bacillus cereus was divided into emetic toxin (cereulide)- and enterotoxin-producing strains, but emetic toxin-producing B. cereus is difficult to detect immunochemically. Screening methods for emetic toxin-producing B. cereus are needed. The objectives of this study were to identify and detect emetic toxin-producing B. cereus among 160 B. cereus strains, and to compare enterotoxin production and phenotypic characteristics between the emetic toxin-producing and enterotoxin-producing strains. Forty emetic toxin-producing B. cereus strains were determined with high-pressure liquid chromatography-mass spectrometry analysis. Among the emetic toxin-producing strains (n = 40), 31 (77.5%) and 3 (7.5%) strains produced nonhemolytic enterotoxin (NHE) and hemolysin BL (HBL) enterotoxins, respectively. In addition, 107 (89.2%) and 100 (83.3%) strains produced NHE and HBL enterotoxins among the enterotoxin-producing strains (n = 120). The number of strains positive for starch hydrolysis, salicin fermentation, and hemolysis among the emetic toxin-producing strains were 3 (7.5%), 3 (7.5%), and 26 (65.0%), respectively, and among enterotoxin-producing strains, these numbers were 101 (84.2%), 100 (83.3%), and 111 (92.5%), respectively. In particular, the three emetic toxin-producing B. cereus strains (JNHE 6, JNHE 36, and KNIH 28) produced the HBL and NHE enterotoxins and were capable of starch hydrolysis and salicin fermentation. The absence of HBL enterotoxin and certain phenotypic properties, such as starch hydrolysis and salicin fermentation, indicates that these properties were not critical characteristics of the emetic toxin-producing B. cereus tested in this study.
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Affiliation(s)
- Jung-Beom Kim
- Division of Health Research and Planning, Gyeonggi-do Research Institute of Health and Environment, Gyeonggi-do, Republic of Korea
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33
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Mallozzi M, Viswanathan VK, Vedantam G. Spore-forming Bacilli and Clostridia in human disease. Future Microbiol 2010; 5:1109-23. [DOI: 10.2217/fmb.10.60] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Many Gram-positive spore-forming bacteria in the Firmicute phylum are important members of the human commensal microbiota, which, in rare cases, cause opportunistic infections. Other spore-formers, however, have evolved to become dedicated pathogens that can cause a striking variety of diseases. Despite variations in disease presentation, the etiologic agent is often the spore, with bacterially produced toxins playing a central role in the pathophysiology of infection. This review will focus on the specific diseases caused by spores of the Clostridia and Bacilli.
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Affiliation(s)
- Michael Mallozzi
- Department of Veterinary Science and Microbiology, University of Arizona, 1117, East Lowell St., Building 90, Room 303, Tucson, AZ 85721, USA
| | - VK Viswanathan
- Department of Veterinary Science and Microbiology, University of Arizona, 1117, East Lowell St., Building 90, Room 303, Tucson, AZ 85721, USA
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34
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Inomata A, Chiba T, Hosaka M. Identification of heterotrophic plate count bacteria isolated from drinking water in Japan by DNA sequencing analysis. Biocontrol Sci 2010; 14:139-45. [PMID: 20055218 DOI: 10.4265/bio.14.139] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Abstract
Heterotrophic plate count (HPC) test has been employed to indicate the effectiveness of water treatment processes and the microbiological condition of the distribution system. In Japan, because the majority of HPC bacteria are supposed to be harmless and all tap water should maintain residual chlorine, there are few studies of the virulence of HPC bacteria. In this study, we examined HPC bacteria isolated from finished and tap water for hemolytic activity to determine their virulence potential. 34 of 39 colonies expressing hemolytic activity were identified by partial 16S rDNA sequencing, but some of their percent identity were relatively low. This may have been due to the mismatching of the primer pair with some strains, or these strains may be unidentified new species. A total of 30 of 34 isolates identified have been reported to be opportunistic pathogens or food poisoning bacteria. To control the growth of these opportunistic pathogens among HPC bacteria, appropriate water quality control must always be done and residual chlorine must be maintained in every tap for a safe water supply.
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Affiliation(s)
- Akiko Inomata
- Tokyo Metropolitan Institute of Public Health, Hyakunin-cho 3-24-1, Shinjuku-ku, Tokyo 169-0073, Japan.
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35
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De Jonghe V, Coorevits A, De Block J, Van Coillie E, Grijspeerdt K, Herman L, De Vos P, Heyndrickx M. Toxinogenic and spoilage potential of aerobic spore-formers isolated from raw milk. Int J Food Microbiol 2009; 136:318-25. [PMID: 19944473 DOI: 10.1016/j.ijfoodmicro.2009.11.007] [Citation(s) in RCA: 121] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2009] [Revised: 10/09/2009] [Accepted: 11/11/2009] [Indexed: 11/26/2022]
Abstract
The harmful effects on the quality and safety of dairy products caused by aerobic spore-forming isolates obtained from raw milk were characterized. Quantitative assessment showed strains of Bacillus subtilis, the Bacillus cereus group, Paenibacillus polymyxa and Bacillus amyloliquefaciens to be strongly proteolytic, along with Bacillus licheniformis, Bacillus pumilus and Lysinibacillus fusiformis to a lesser extent. Lipolytic activity could be demonstrated in strains of B. subtilis, B. pumilus and B. amyloliquefaciens. Qualitative screening for lecithinase activity also revealed that P. polymyxa strains produce this enzyme besides the B. cereus group that is well-known for causing a 'bitty cream' defect in pasteurized milk due to lecithinase activity. We found a strain of P. polymyxa to be capable of gas production during lactose fermentation. Strains belonging to the species B. amyloliquefaciens, Bacillus clausii, Lysinibacillus sphaericus, B. subtilis and P. polymyxa were able to reduce nitrate. A heat-stable cytotoxic component other than the emetic toxin was produced by strains of B. amyloliquefaciens and B. subtilis. Heat-labile cytotoxic substances were produced by strains identified as B. amyloliquefaciens, B. subtilis, B. pumilus and the B. cereus group. Variations in expression levels between strains from the same species were noticed for all tests. This study emphasizes the importance of aerobic spore-forming bacteria in raw milk as the species that are able to produce toxins and/or spoilage enzymes are all abundantly present in raw milk. Moreover, we demonstrated that some strains are capable of growing at room temperature and staying stable at refrigeration temperatures.
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Affiliation(s)
- Valerie De Jonghe
- Institute for Agricultural and Fisheries Research (ILVO), Technology and Food Science Unit, Brusselsesteenweg 370, 9090 Melle, Belgium.
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36
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Moore D, Taylor J, Hartman M, Sischo W. Quality assessments of waste milk at a calf ranch. J Dairy Sci 2009. [DOI: 10.3168/jds.2008-1623] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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37
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Makarasen A, Yoza K, Isobe M. Higher structure of cereulide, an emetic toxin from Bacillus cereus, and special comparison with valinomycin, an antibiotic from Streptomyces fulvissimus. Chem Asian J 2009; 4:688-98. [PMID: 19347893 DOI: 10.1002/asia.200900011] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Cereulide and valinomycin are both 36-membered cyclic depsipeptides with 12 stereogenic centers that have a very similar sequence of cyclo [-D-O-Leu-D-Ala-L-O-Val-L-Val-]3 and cyclo [-D-O-Val-D-Val-L-O-Ala-L-Val-]3, respectively. Cereulide is an emetic toxin produced by Bacillus cereus through an unusual non-ribosomal peptide synthesis (NRPS), whereas valinomycin, produced by Streptomyces fulvissimus, is a known antibiotic drug. Both compounds are known as K+-ion-selective ionophores and cause a potassium-dependent drop in the transmembrane potential of mitochondria, arising from the uptake of a K+-ion-charged ionophore complex. Such compounds may affect mitochondrial function. In the three-dimensional structure of cereulide and valinomycin, cereulide has a vertical and horizontal mirror-image-like structure as is the case in valinomycin. The only difference is the side chains which are linked to a similar framework. Through the current 1H NMR spectroscopy and metal-complexation studies, we found that cereulide had a higher complexation ability to metal ions compared to valinomycin. Cereulide exhibited the K+-ion-selective ionophore property at a lower concentration than valinomycin. X-ray crystallographic analyses of the cereulide and valinomycin H+ form were compared, and revealed that the higher structures of both compounds also showed similarity in the crystal structures. The structure of cereulide-H+ form was found to be in agreement with the structure obtained by a combination of NMR spectroscopy and molecular-mechanics calculations, which afforded reasonable dihedral angles at the local-minimum-energy conformation of the cereulide-K+-ion complex.
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Affiliation(s)
- Arthit Makarasen
- Laboratory of Organic Chemistry, Graduate School of Bioagricultural Sciences, Nagoya University, Chikusa, Nagoya, 466-8601, Japan
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Apetroaie-Constantin C, Mikkola R, Andersson M, Teplova V, Suominen I, Johansson T, Salkinoja-Salonen M. Bacillus subtilisandB. mojavensisstrains connected to food poisoning produce the heat stable toxin amylosin. J Appl Microbiol 2009; 106:1976-85. [DOI: 10.1111/j.1365-2672.2009.04167.x] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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Kim JH, Lim EG, Jang HC, Park JY, Lee SJ, Park MS, Choi GB, Lee BK. A Case of Emetic Toxin ProducingBacillus cereusStrains Isolated from Outbreak. ACTA ACUST UNITED AC 2009. [DOI: 10.5145/kjcm.2009.12.1.48] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Jong Hyun Kim
- Division of Enteric Bacterial Infections, Center for Infectious Diseases, National Institute of Health, Seoul, Korea
| | - Eun Gyoung Lim
- Microbe Division, Ulsan Institute of Health and Environment, Ulsan, Korea
| | - Hyun Chul Jang
- Division of Enteric Bacterial Infections, Center for Infectious Diseases, National Institute of Health, Seoul, Korea
| | - Ju Young Park
- Microbe Division, Ulsan Institute of Health and Environment, Ulsan, Korea
| | - Sun Jin Lee
- Division of Enteric Bacterial Infections, Center for Infectious Diseases, National Institute of Health, Seoul, Korea
| | - Mi Sun Park
- Division of Enteric Bacterial Infections, Center for Infectious Diseases, National Institute of Health, Seoul, Korea
| | - Gil Bae Choi
- Microbe Division, Ulsan Institute of Health and Environment, Ulsan, Korea
| | - Bok Kwon Lee
- Division of Enteric Bacterial Infections, Center for Infectious Diseases, National Institute of Health, Seoul, Korea
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40
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The maintenance of the list of QPS microorganisms intentionally added to food or feed - Scientific Opinion of the Panel on Biological Hazards. EFSA J 2008. [DOI: 10.2903/j.efsa.2008.923] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
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41
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Ngamwongsatit P, Banada PP, Panbangred W, Bhunia AK. WST-1-based cell cytotoxicity assay as a substitute for MTT-based assay for rapid detection of toxigenic Bacillus species using CHO cell line. J Microbiol Methods 2008; 73:211-5. [DOI: 10.1016/j.mimet.2008.03.002] [Citation(s) in RCA: 177] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2007] [Revised: 03/04/2008] [Accepted: 03/05/2008] [Indexed: 11/25/2022]
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Grande MJ, Abriouel H, Lucas López R, Valdivia E, Ben Omar N, Martínez-Cañamero M, Gálvez A. Efficacy of enterocin AS-48 against bacilli in ready-to-eat vegetable soups and purees. J Food Prot 2007; 70:2339-45. [PMID: 17969616 DOI: 10.4315/0362-028x-70.10.2339] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The broad-spectrum bacteriocin enterocin AS-48 was tested for biopreservation of ready-to-eat vegetable foods (soups and purees) against aerobic mesophilic endospore-forming bacteria. By adding AS-48 (10 microg/ml), Bacillus cereus LWL1 was completely inhibited in all six vegetable products tested (natural vegetable cream, asparagus cream, traditional soup, homemade-style traditional soup, vegetable soup, and vichyssoise) for up to 30 days at 6, 15, and 22 degrees C. A collection of strains isolated from spoiled purees showed slightly higher resistance to AS-48 in the order Paenibacillus sp. > Bacillus macroides > B. cereus, although they were also completely inhibited in natural vegetable cream by AS-48 at 10 microg/ml. However, cocktails of five or eight strains composed of B. cereus (three strains), B. macroides (two strains), and Paenibacillus sp., Paenibacillus polymyxa, and Paenibacillus amylolyticus showed higher bacteriocin resistance with AS-48 of up to 50 microg/ml required for complete inactivation in natural vegetable cream stored at 22 degrees C. Repetitive extragenic palindromic sequence-based PCR (REP-PCR) analysis showed that paenibacilli (along with some B. cereus) was the predominant survivor in the cocktails after bacteriocin treatment. To increase the effectiveness of enterocin AS-48, the bacteriocin was tested (at 20 microg/ml) against the eight-strain cocktail in natural vegetable cream in combination with other antimicrobials. The combination of AS-48 and nisin had a slight but significant additive effect. Bactericidal activity was greatly enhanced by phenolic compounds (carvacrol, eugenol, geraniol, and hydrocinnamic acid), achieving a rapid and complete inactivation of bacilli in the tested puree at 22 degrees C.
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Affiliation(s)
- Maria J Grande
- Area de Microbiología, Departamento de Ciencias de la Salud, Facultad de Ciencias Experimentales, Universidad de Jaén, 23071-Jaén, Spain
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Halpern M, Raats D, Lev-Yadun S. Plant biological warfare: thorns inject pathogenic bacteria into herbivores. Environ Microbiol 2007; 9:584-92. [PMID: 17298359 DOI: 10.1111/j.1462-2920.2006.01174.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Thorns, spines and prickles are among the rich arsenal of antiherbivore defence mechanisms that plants have evolved. Many of these thorns are aposematic, that is, marked by various types of warning coloration. This coloration was recently proposed to deter large herbivores. Yet, the mechanical defence provided by thorns against large herbivores might be only the tip of the iceberg in a much more complicated story. Here we present evidence that thorns harbour an array of pathogenic bacteria that are much more dangerous to herbivores than the painful mechanical wounding by the thorns. Pathogenic bacteria like Clostridium perfringens, the causative agent of the life-threatening gas gangrene, and others, were isolated and identified from date palm (with green-yellow-black aposematic spines) and common hawthorn (with red aposematic thorns). These thorn-inhabiting bacteria have a considerable potential role in antiherbivory, and may have uniquely contributed to the common evolution of aposematism (warning coloration) in thorny plants.
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Affiliation(s)
- Malka Halpern
- Department of Biology, Faculty of Science and Science Education, University of Haifa - Oranim, Tivon 36006, Israel.
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From C, Hormazabal V, Hardy SP, Granum PE. Cytotoxicity in Bacillus mojavensis is abolished following loss of surfactin synthesis: implications for assessment of toxicity and food poisoning potential. Int J Food Microbiol 2007; 117:43-9. [PMID: 17467096 DOI: 10.1016/j.ijfoodmicro.2007.01.013] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2006] [Revised: 01/15/2007] [Accepted: 01/22/2007] [Indexed: 11/17/2022]
Abstract
Bacillus subtilis and the closely related species Bacillus pumilus and Bacillus licheniformis have periodically been suggested to play a role in the aetiology of food poisoning despite the fact that the organisms do not possess the genes associated with enteropathogenicity in Bacillus cereus. We show here that Bacillus mojavensis, an organism closely related to B. subtilis, is able to produce toxic components which identify as a complex of three different surfactin analogues. These cyclic lipopeptides were soluble in methanol, heat stable after treatment in a boiling water bath for 10 min, resistant to enzymatic degradation by pepsin, trypsin, endoprotease V8 and proteinase K and formed pores in planar lipid bilayers. They were cytotoxic when tested in a series of commonly used laboratory cytotoxicity assays, namely, lactate dehydrogenase release, haemolysis, inhibition of both protein synthesis in Vero cells and motility in boar sperm. We show that such in vitro markers of enterotoxicity are due entirely to production of cyclic lipopeptides since deletion of sfp, a gene essential for surfactin synthesis which abolished the cytotoxicity to Vero cells, boar sperm motility and haemolytic activity. Thus, the relevance of cyclic lipopeptides as food poisoning toxins needs to be evaluated in assays other than the cell cytotoxicity assays in common use.
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Affiliation(s)
- C From
- Department of Food Safety and Infection Biology, Norwegian School of Veterinary Science, NO-0033 Oslo, Norway
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45
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Grande MJ, Lucas R, Abriouel H, Valdivia E, Ben Omar N, Maqueda M, Martínez-Cañamero M, Gálvez A. Inhibition of Bacillus licheniformis LMG 19409 from ropy cider by enterocin AS-48. J Appl Microbiol 2007; 101:422-8. [PMID: 16882150 DOI: 10.1111/j.1365-2672.2006.02942.x] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
AIMS To determine the activity of enterocin AS-48 against ropy-forming Bacillus licheniformis from cider. METHODS AND RESULTS Enterocin AS-48 was tested on B. licheniformis LMG 19409 from ropy cider in MRS-G broth, fresh-made apple juice and in two commercial apple ciders (A and B). Bacillus licheniformis was rapidly inactivated in MRS-G by 0.5 microg ml(-1)AS-48 and in fresh-made apple juice by 3 microg ml(-1). Concentration-dependent inactivation of this bacterium in two commercial apple ciders (A and B) stored at 4, 15 and 30 degrees C for 15 days was also demonstrated. Counts from heat-activated endospores in cider A plus AS-48 decreased very slowly. Application of combined treatments of heat (95 degrees C) and enterocin AS-48 reduced the time required to achieved complete inactivation of intact spores in cider A to 4 min for 6 microg ml(-1) and to 1 min for 12 microg ml(-1). D and z values also decreased as the bacteriocin concentration increased. CONCLUSION Enterocin AS-48 can inhibit ropy-forming B. licheniformis in apple cider and increase the heat sensitivity of spores. SIGNIFICANCE AND IMPACT OF THE STUDY Results from this study support the potential use of enterocin AS-48 to control B. licheniformis in apple cider.
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Affiliation(s)
- M J Grande
- Departamento de Ciencias de la Salud, Facultad de Ciencias Experimentales, Universidad de Jaén, Jaén, Spain
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46
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Gray KM, Banada PP, O'Neal E, Bhunia AK. Rapid Ped-2E9 cell-based cytotoxicity analysis and genotyping of Bacillus species. J Clin Microbiol 2005; 43:5865-72. [PMID: 16333068 PMCID: PMC1317164 DOI: 10.1128/jcm.43.12.5865-5872.2005] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2005] [Revised: 05/22/2005] [Accepted: 09/25/2005] [Indexed: 11/20/2022] Open
Abstract
Bacillus species causing food-borne disease produce multiple toxins eliciting gastroenteritis. Toxin assays with mammalian cell cultures are reliable but may take 24 to 72 h to complete and also lack sensitivity. Here, a sensitive and rapid assay was developed using a murine hybridoma Ped-2E9 cell model. Bacillus culture supernatants containing toxins were added to a Ped-2E9 cell line and analyzed for cytotoxicity with an alkaline phosphatase release assay. Most Bacillus cereus strains produced positive cytotoxicity results within 1 h, and data were comparable to those obtained with the standard Chinese hamster ovary (CHO)-based cytotoxicity assay, which took about 72 h to complete. Moreover, the Ped-2E9 cell assay had 25- to 58-fold-higher sensitivity than the CHO assay. Enterotoxin-producing Bacillus thuringiensis also gave positive results with Ped-2E9 cells, while several other Bacillus species were negative. Eight isolates from food suspected of Bacillus contamination were also tested, and only one strain, which was later confirmed as B. cereus, gave a positive result. In comparison with two commercial diarrheal toxin assay kits (BDE-VIA and BCET-RPLA), the Ped-2E9 assay performed more reliably. Toxin fractions of >30 kDa showed the highest degree of cytotoxicity effects, and heat treatment significantly reduced the toxin activity, indicating the involvement of a heat-labile high-molecular-weight component in Ped-2E9 cytotoxicity. PCR results, in most cases, were in agreement with the cytotoxic potential of each strain. Ribotyping was used to identify cultures and indicated differences for several previously reported isolates. This Ped-2E9 cell assay could be used as a rapid (approximately 1-h) alternative to current methods for sensitive detection of enterotoxins from Bacillus species.
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Affiliation(s)
- Kristen M Gray
- Molecular Food Microbiology Laboratory, Department of Food Science, Purdue University, 745 Agriculture Mall Drive, West Lafayette, IN 47907, USA
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Opinion of the Scientific Panel on additives and products or substances used in animal feed (FEEDAP) on the safety of BioProtein: product of fermentation from natural gas. EFSA J 2005. [DOI: 10.2903/j.efsa.2005.230] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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