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Koike H, Kanda M, Monma C, Yoshikawa S, Hayashi H, Matsushima Y, Ohba Y, Hayashi M, Furuta N, Okada W, Nagano C, Yokoyama K, Yokoyama T, Sasamoto T. Development of a simple screening method for analyzing cereulide toxin in fried rice using liquid chromatography-tandem mass spectrometry. Forensic Toxicol 2024; 42:163-171. [PMID: 38519777 PMCID: PMC11269499 DOI: 10.1007/s11419-024-00683-3] [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: 08/21/2023] [Accepted: 02/08/2024] [Indexed: 03/25/2024]
Abstract
PURPOSE The presence of cereulide, an emetic toxin produced by Bacillus cereus, in fried rice samples is critical evidence of food poisoning even in situations where B. cereus could not be detected. This study aims to develop a screening method for analyzing cereulide in fried rice using the QuEChERS procedure and liquid chromatography-tandem mass spectrometry (LC-MS/MS). METHODS Cereulide was identified and quantified in fried rice samples using the QuEChERS extraction method and LC-MS/MS. The accuracies of the methods were determined by analyzing fortified blank samples at two concentrations (10 and 50 µg/kg) conducted on three samples daily for five days. RESULTS The QuEChERS procedure removed matrix compounds from fried rice. Characteristic MS/MS spectra enabled the identification of cereulide. As the matrix effects in seven fried rice samples were within ± 6%, an external solvent calibration curve could be used for quantification. This method exhibited good accuracy ranging from 88 to 89%. The relative standard deviations for both repeatability and intra-laboratory reproducibility were < 4%. These standard deviations satisfied the criteria of the Japanese validation guidelines for residues (MHLW 2010, Director Notice, Syoku-An No. 1224-1). The limit of quantification was 2 μg/kg. The applicability of this method was confirmed using the analysis of cereulide in fried rice samples incubated with emetic Bacillus cereus. CONCLUSIONS The QuEChERS extraction procedure described herein showed substantial promise as a reliable screening tool for cereulide in fried rice sample.
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Affiliation(s)
- Hiroshi Koike
- Department of Food Safety, Tokyo Metropolitan Institute of Public Health, Tokyo, Japan.
| | - Maki Kanda
- Department of Food Safety, Tokyo Metropolitan Institute of Public Health, Tokyo, Japan
| | - Chie Monma
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, 3-24-1, Hyakunin-Cho, Shinjuku-Ku, Tokyo, 169-0073, Japan
| | - Souichi Yoshikawa
- Department of Food Safety, Tokyo Metropolitan Institute of Public Health, Tokyo, Japan
| | - Hiroshi Hayashi
- Department of Food Safety, Tokyo Metropolitan Institute of Public Health, Tokyo, Japan
| | - Yoko Matsushima
- Department of Food Safety, Tokyo Metropolitan Institute of Public Health, Tokyo, Japan
| | - Yumi Ohba
- Department of Food Safety, Tokyo Metropolitan Institute of Public Health, Tokyo, Japan
| | - Momoka Hayashi
- Department of Food Safety, Tokyo Metropolitan Institute of Public Health, Tokyo, Japan
| | - Natsumi Furuta
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, 3-24-1, Hyakunin-Cho, Shinjuku-Ku, Tokyo, 169-0073, Japan
| | - Wakaba Okada
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, 3-24-1, Hyakunin-Cho, Shinjuku-Ku, Tokyo, 169-0073, Japan
| | - Chieko Nagano
- Department of Food Safety, Tokyo Metropolitan Institute of Public Health, Tokyo, Japan
| | - Keiko Yokoyama
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, 3-24-1, Hyakunin-Cho, Shinjuku-Ku, Tokyo, 169-0073, Japan
| | - Tomoko Yokoyama
- Department of Food Safety, Tokyo Metropolitan Institute of Public Health, Tokyo, Japan
| | - Takeo Sasamoto
- Department of Food Safety, Tokyo Metropolitan Institute of Public Health, Tokyo, Japan
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Detection of emetic Bacillus cereus and the emetic toxin cereulide in food matrices: Progress and perspectives. Trends Food Sci Technol 2022. [DOI: 10.1016/j.tifs.2022.03.023] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Ramarao N, Tran SL, Marin M, Vidic J. Advanced Methods for Detection of Bacillus cereus and Its Pathogenic Factors. SENSORS (BASEL, SWITZERLAND) 2020; 20:E2667. [PMID: 32392794 PMCID: PMC7273213 DOI: 10.3390/s20092667] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Revised: 05/02/2020] [Accepted: 05/05/2020] [Indexed: 12/21/2022]
Abstract
Bacillus cereus is an opportunistic foodborne pathogen causing food intoxication and infectious diseases. Different toxins and pathogenic factors are responsible for diarrheal syndrome, like nonhemolytic enterotoxin Nhe, hemolytic enterotoxin Hbl, enterotoxin FM and cytotoxin K, while emetic syndrome is caused by the depsipeptide cereulide toxin. The traditional method of B. cereus detection is based on the bacterial culturing onto selective agars and cells enumeration. In addition, molecular and chemical methods are proposed for toxin gene profiling, toxin quantification and strain screening for defined virulence factors. Finally, some advanced biosensors such as phage-based, cell-based, immunosensors and DNA biosensors have been elaborated to enable affordable, sensitive, user-friendly and rapid detection of specific B. cereus strains. This review intends to both illustrate the state of the B. cereus diagnostic field and to highlight additional research that is still at the development level.
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Affiliation(s)
- Nalini Ramarao
- INRAE, AgroParisTech, Micalis Institute, Université Paris-Saclay, 78350 Jouy-en-Josas, France; (S.-L.T.); (M.M.)
| | | | | | - Jasmina Vidic
- INRAE, AgroParisTech, Micalis Institute, Université Paris-Saclay, 78350 Jouy-en-Josas, France; (S.-L.T.); (M.M.)
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Koike H, Kanda M, Hayashi H, Matsushima Y, Ohba Y, Nakagawa Y, Nagano C, Sekimura K, Hirai A, Shindo T, Kamiie J, Sasamoto T, Hashimoto T. Identification and quantification of cereulide in cow’s milk using liquid chromatography-tandem mass spectrometry. Food Addit Contam Part A Chem Anal Control Expo Risk Assess 2018; 35:2424-2433. [DOI: 10.1080/19440049.2018.1544722] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Hiroshi Koike
- Tokyo Metropolitan Institute of Public Health, Tokyo, Japan
| | - Maki Kanda
- Tokyo Metropolitan Institute of Public Health, Tokyo, Japan
| | | | | | - Yumi Ohba
- Tokyo Metropolitan Institute of Public Health, Tokyo, Japan
| | | | - Chieko Nagano
- Tokyo Metropolitan Institute of Public Health, Tokyo, Japan
| | | | - Akihiko Hirai
- Tokyo Metropolitan Institute of Public Health, Tokyo, Japan
| | - Tetsuya Shindo
- Tokyo Metropolitan Institute of Public Health, Tokyo, Japan
| | - Junichi Kamiie
- Laboratory of Veterinary Pathology, School of Veterinary Medicine, Azabu University, Sagamihara, Japan
| | - Takeo Sasamoto
- Tokyo Metropolitan Institute of Public Health, Tokyo, Japan
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Decleer M, Jovanovic J, Vakula A, Udovicki B, Agoua RSEK, Madder A, De Saeger S, Rajkovic A. Oxygen Consumption Rate Analysis of Mitochondrial Dysfunction Caused by Bacillus cereus Cereulide in Caco-2 and HepG2 Cells. Toxins (Basel) 2018; 10:E266. [PMID: 30004412 PMCID: PMC6070949 DOI: 10.3390/toxins10070266] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2018] [Revised: 06/20/2018] [Accepted: 06/22/2018] [Indexed: 12/28/2022] Open
Abstract
The emetic syndrome of Bacillus cereus is a food intoxication caused by cereulide (CER) and manifested by emesis, nausea and in most severe cases with liver failure. While acute effects have been studied in the aftermath of food intoxication, an exposure to low doses of cereulide might cause unnoticed damages to the intestines and liver. The toxicity which relies on the mitochondrial dysfunction was assessed on Caco-2 and HepG2 cells after exposure of one, three and ten days to a range of low doses of cereulide. Oxygen consumption rate analyses were used to study the impact of low doses of CER on the bioenergetics functions of undifferentiated Caco-2 and HepG2 cells using Seahorse XF extracellular flux analyzer. Both Caco-2 and HepG2 cells experienced measurable mitochondrial impairment after prolonged exposure of 10 days to 0.25 nM of cereulide. Observed mitochondrial dysfunction was greatly reflected in reduction of maximal cell respiration. At 0.50 nM CER, mitochondrial respiration was almost completely shut down, especially in HepG2 cells. These results corresponded with a severe reduction in the amount of cells and an altered morphology, observed by microscopic examination of the cells. Accurate and robust quantification of basal respiration, ATP production, proton leak, maximal respiration, spare respiratory capacity, and non-mitochondrial respiration allowed better understanding of the effects of cereulide in underlying respiratory malfunctions in low-dose exposure.
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Affiliation(s)
- Marlies Decleer
- Department of Food Technology, Food Safety and Health, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000 Ghent, Belgium.
- Laboratory of Food Analysis, Department of Bioanalysis, Faculty of Pharmaceutical Sciences, Ghent University, Ottergemsesteenweg 460, 9000 Ghent, Belgium.
| | - Jelena Jovanovic
- Department of Food Technology, Food Safety and Health, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000 Ghent, Belgium.
| | - Anita Vakula
- Department of Food Preservation Engineering, Faculty of Technology, University of Novi Sad, Bulevar Cara Lazara 1, 21000 Novi Sad, Serbia.
| | - Bozidar Udovicki
- Department of Food Safety and Food Quality Management, Faculty of Agriculture, University of Belgrade, Nemanjina 6, 11081 Zemun-Belgrade, Serbia.
| | - Rock-Seth E K Agoua
- Department of Food Technology, Food Safety and Health, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000 Ghent, Belgium.
| | - Annemieke Madder
- Department of Organic and Macromolecular Chemistry, Organic and Biomimetic Chemistry Research Group, Faculty of Sciences, Campus Sterre, Krijgslaan 281, Building S4, 9000 Gent, Belgium.
| | - Sarah De Saeger
- Laboratory of Food Analysis, Department of Bioanalysis, Faculty of Pharmaceutical Sciences, Ghent University, Ottergemsesteenweg 460, 9000 Ghent, Belgium.
| | - Andreja Rajkovic
- Department of Food Technology, Food Safety and Health, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000 Ghent, Belgium.
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Marxen S, Stark TD, Rütschle A, Lücking G, Frenzel E, Scherer S, Ehling-Schulz M, Hofmann T. Multiparametric Quantitation of the Bacillus cereus Toxins Cereulide and Isocereulides A-G in Foods. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2015; 63:8307-8313. [PMID: 26352912 DOI: 10.1021/acs.jafc.5b03705] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Consumption of food products contaminated with cereulide (1), a toxin produced by Bacillus cereus, might cause intoxications with symptoms reported to range from indigestion pain and emesis to death. Recently, a series of structural variants, coined isocereulides A-G (2-8), were identified for the first time to be produced along with cereulide (1). The observation that isocereulide A (2) shows an ∼ 8-fold increased cytotoxicity when compared to 1 urges the development of analytical tools enabling an accurate quantitation of these toxins. Therefore, a rapid, sensitive, and robust stable isotope dilution assay (SIDA) was developed for the combined quantitation of 1-8 by means of UPLC-MS/MS. On average, trueness and precision of the method were 112.5 ± 1.8% RSD, repeatability and reproducibility were 2 and 4% for cereulide and isocereulides A-G, and the LOD and LOQ of 0.1 and 0.5 ng/g, respectively, demonstrated a high sensitivity for the developed SIDA method. Application of this method to food samples revealed elevated levels of 1-8 in two suspicious noodle samples, for example, ranging from 0.59 (7) to 189.08 ng/g (1) in sample 1 and from 5.77 (7) to 6198.17 ng/g (1) in sample 2, whereas the analysis of 25 randomly selected food samples, which have not been the subject to any complaints, did not contain detectable amounts of any of these toxins. As a consequence, this SIDA method could add an important contribution to the knowledge-based risk assessment of B. cereus toxins in foods.
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Affiliation(s)
| | | | | | | | - Elrike Frenzel
- Functional Microbiology, Institute of Microbiology, Department of Pathobiology, University of Veterinary Medicine Vienna , 1210 Vienna, Austria
| | - Siegfried Scherer
- Chair of Microbial Ecology, Department of Biosciences, WZW, Technische Universität München , 85350 Freising, Germany
| | - Monika Ehling-Schulz
- Functional Microbiology, Institute of Microbiology, Department of Pathobiology, University of Veterinary Medicine Vienna , 1210 Vienna, Austria
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Vangoitsenhoven R, Maris M, Overbergh L, Van Loco J, Mathieu C, Van der Schueren B. Cereulide food toxin, beta cell function and diabetes: Facts and hypotheses. Diabetes Res Clin Pract 2015; 109:1-5. [PMID: 25998918 DOI: 10.1016/j.diabres.2015.04.029] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/23/2015] [Accepted: 04/28/2015] [Indexed: 01/11/2023]
Abstract
The incidence of both type 1 and type 2 diabetes is increasing and although environmental pollutants are believed to be potential culprits, the extent to which they can be held responsible remains uncertain. Some bacterial strains of the Bacillus cereus produce a toxin, cereulide, which is frequently found in starchy meals and which is difficult to eradicate from the food chain as it is highly resistant to heat, acidity and proteolysis. While cereulide is well known to cause acute emetic toxicity when ingested at high doses, several in vitro studies have shown that also extremely low doses of cereulide can be toxic, with beta cells being particularly sensitive. Mechanistically, such low doses impair the mitochondrial activity of the beta cells thereby leading to hampered insulin secretion and cell death, both key traits in the pathophysiology of diabetes. In vivo studies of chronic or repeated low dose exposure to cereulide are currently lacking, but should be performed to further clarify the true relevance of cereulide as a potential environmental contributor to the ongoing diabetes epidemic.
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Affiliation(s)
| | - Michael Maris
- Clinical and Experimental Endocrinology, KU Leuven, Leuven, Belgium
| | - Lut Overbergh
- Clinical and Experimental Endocrinology, KU Leuven, Leuven, Belgium
| | - Joris Van Loco
- Scientific Institute of Public Health, Brussels, Belgium
| | - Chantal Mathieu
- Clinical and Experimental Endocrinology, KU Leuven, Leuven, Belgium
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8
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Zuberovic Muratovic A, Tröger R, Granelli K, Hellenäs KE. Quantitative analysis of cereulide toxin from Bacillus cereus in rice and pasta using synthetic cereulide standard and 13C6-cereulide standard - a short validation study. Toxins (Basel) 2014; 6:3326-35. [PMID: 25514093 PMCID: PMC4280537 DOI: 10.3390/toxins6123326] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2014] [Revised: 11/12/2014] [Accepted: 11/25/2014] [Indexed: 12/17/2022] Open
Abstract
A single laboratory validation study of a rapid and sensitive quantitative method for the analysis of cereulide toxin produced by Bacillus cereus using ultra high performance liquid chromatography-electrospray-tandem mass spectrometry is presented. The analysis of this cyclic peptide toxin was validated for pasta and rice samples using a newly presented synthetic cereulide peptide standard, together with 13C6-cereulide that previously have not been commercially available. The use of cereulide standard was also compared to the most frequently used surrogate standard, the antibiotic valinomycin. The performance of the method was evaluated by analyzing spiked sample pools from different types of rice and pasta, as well as 21 individual rice and pasta samples from differently prepared meals. Inoculation of samples with three cereulide toxin-producing strains of Bacillus cereus was finally used to mimic naturally contaminated foods. The quantification range of the method was 1–500 ng/g (R2 = 0.999) and the limits of detection and quantification were 0.1 and 1 ng/g, respectively. The precision varied from 3% to 7% relative standard deviation and the trueness from −2% to +6% relative bias at different concentration levels in cooked rice and pasta.
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Affiliation(s)
| | - Rikard Tröger
- Science Department, National Food Agency, Box 622, SE-751 26 Uppsala, Sweden.
| | - Kristina Granelli
- Science Department, National Food Agency, Box 622, SE-751 26 Uppsala, Sweden.
| | - Karl-Erik Hellenäs
- Science Department, National Food Agency, Box 622, SE-751 26 Uppsala, Sweden.
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Vangoitsenhoven R, Rondas D, Crèvecoeur I, D'Hertog W, Baatsen P, Masini M, Andjelkovic M, Van Loco J, Matthys C, Mathieu C, Overbergh L, Van der Schueren B. Foodborne cereulide causes beta-cell dysfunction and apoptosis. PLoS One 2014; 9:e104866. [PMID: 25119564 PMCID: PMC4132018 DOI: 10.1371/journal.pone.0104866] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2014] [Accepted: 07/14/2014] [Indexed: 01/10/2023] Open
Abstract
Aims/Hypothesis To study the effects of cereulide, a food toxin often found at low concentrations in take-away meals, on beta-cell survival and function. Methods Cell death was quantified by Hoechst/Propidium Iodide in mouse (MIN6) and rat (INS-1E) beta-cell lines, whole mouse islets and control cell lines (HepG2 and COS-1). Beta-cell function was studied by glucose-stimulated insulin secretion (GSIS). Mechanisms of toxicity were evaluated in MIN6 cells by mRNA profiling, electron microscopy and mitochondrial function tests. Results 24 h exposure to 5 ng/ml cereulide rendered almost all MIN6, INS-1E and pancreatic islets apoptotic, whereas cell death did not increase in the control cell lines. In MIN6 cells and murine islets, GSIS capacity was lost following 24 h exposure to 0.5 ng/ml cereulide (P<0.05). Cereulide exposure induced markers of mitochondrial stress including Puma (p53 up-regulated modulator of apoptosis, P<0.05) and general pro-apoptotic signals as Chop (CCAAT/-enhancer-binding protein homologous protein). Mitochondria appeared swollen upon transmission electron microscopy, basal respiration rate was reduced by 52% (P<0.05) and reactive oxygen species increased by more than twofold (P<0.05) following 24 h exposure to 0.25 and 0.50 ng/ml cereulide, respectively. Conclusions/Interpretation Cereulide causes apoptotic beta-cell death at low concentrations and impairs beta-cell function at even lower concentrations, with mitochondrial dysfunction underlying these defects. Thus, exposure to cereulide even at concentrations too low to cause systemic effects appears deleterious to the beta-cell.
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Affiliation(s)
- Roman Vangoitsenhoven
- Laboratory for Clinical and Experimental Medicine and Endocrinology, KU Leuven, Leuven, Belgium
| | - Dieter Rondas
- Laboratory for Clinical and Experimental Medicine and Endocrinology, KU Leuven, Leuven, Belgium
| | - Inne Crèvecoeur
- Laboratory for Clinical and Experimental Medicine and Endocrinology, KU Leuven, Leuven, Belgium
| | - Wannes D'Hertog
- Laboratory for Clinical and Experimental Medicine and Endocrinology, KU Leuven, Leuven, Belgium
| | - Pieter Baatsen
- EM Facility, VIB Bio Imaging Core and VIB department for the Biology of Disease, KU Leuven, Leuven, Belgium
| | - Matilde Masini
- Department of Translational Research and of New Surgical and Medical Technologies, University of Pisa, Pisa, Italy
| | - Mirjana Andjelkovic
- Food, Medicines, and Consumer Safety, Scientific Institute of Public Health, Brussels, Belgium
| | - Joris Van Loco
- Food, Medicines, and Consumer Safety, Scientific Institute of Public Health, Brussels, Belgium
| | - Christophe Matthys
- Laboratory for Clinical and Experimental Medicine and Endocrinology, KU Leuven, Leuven, Belgium
| | - Chantal Mathieu
- Laboratory for Clinical and Experimental Medicine and Endocrinology, KU Leuven, Leuven, Belgium
| | - Lut Overbergh
- Laboratory for Clinical and Experimental Medicine and Endocrinology, KU Leuven, Leuven, Belgium
| | - Bart Van der Schueren
- Laboratory for Clinical and Experimental Medicine and Endocrinology, KU Leuven, Leuven, Belgium
- * E-mail:
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Yamaguchi M, Kawai T, Kitagawa M, Kumeda Y. A new method for rapid and quantitative detection of the Bacillus cereus emetic toxin cereulide in food products by liquid chromatography-tandem mass spectrometry analysis. Food Microbiol 2013; 34:29-37. [DOI: 10.1016/j.fm.2012.11.010] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2012] [Revised: 10/22/2012] [Accepted: 11/19/2012] [Indexed: 11/16/2022]
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Stark T, Marxen S, Rütschle A, Lücking G, Scherer S, Ehling-Schulz M, Hofmann T. Mass spectrometric profiling of Bacillus cereus strains and quantitation of the emetic toxin cereulide by means of stable isotope dilution analysis and HEp-2 bioassay. Anal Bioanal Chem 2012; 405:191-201. [PMID: 23079954 DOI: 10.1007/s00216-012-6485-6] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2012] [Revised: 09/29/2012] [Accepted: 10/05/2012] [Indexed: 11/25/2022]
Abstract
A fast and robust high-throughput ultra-performance liquid chromatography/time-of-flight mass spectrometry (UPLC-TOF MS) profiling method was developed and successfully applied to discriminate a total of 78 Bacillus cereus strains into no/low, medium and high producers of the emetic toxin cereulide. The data obtained by UPLC-TOF MS profiling were confirmed by absolute quantitation of cereulide in selected samples by means of high-performance liquid chromatography with tandem mass spectrometry (HPLC-MS/MS) and stable isotope dilution assay (SIDA). Interestingly, the B. cereus strains isolated from four vomit samples and five faeces samples from patients showing symptoms of intoxication were among the group of medium or high producers. Comparison of HEp-2 bioassay data with those determined by means of mass spectrometry showed differences, most likely because the HEp-2 bioassay is based on the toxic action of cereulide towards mitochondria of eukaryotic cells rather than on a direct measurement of the toxin. In conclusion, the UPLC-electrospray ionization (ESI)-TOF MS and the HPLC-ESI-MS/MS-SIDA analyses seem to be promising tools for the robust high-throughput analysis of cereulide in B. cereus cultures, foods and other biological samples.
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Affiliation(s)
- Timo Stark
- Food Chemistry and Molecular Sensory Science, Technische Universität München, Lise-Meitner-Strasse 34, 85354 Freising, Germany
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12
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Jiang JH, Tong J, Gabriel K. Hijacking Mitochondria: Bacterial Toxins that Modulate Mitochondrial Function. IUBMB Life 2012; 64:397-401. [DOI: 10.1002/iub.1021] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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13
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Delbrassinne L, Andjelkovic M, Rajkovic A, Dubois P, Nguessan E, Mahillon J, Van Loco J. Determination of Bacillus cereus Emetic Toxin in Food Products by Means of LC–MS². FOOD ANAL METHOD 2011. [DOI: 10.1007/s12161-011-9340-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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14
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Ueda S, Kuwabara Y. Rapid identification of emetic Bacillus cereus by immunochromatography. Biocontrol Sci 2011; 16:41-5. [PMID: 21467628 DOI: 10.4265/bio.16.41] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Abstract
The immunochromatographic assay, which targets a marker protein co-expressed during the synthesis of cereulide by an emetic Bacillus cereus strain, was used for easily, rapidly and specifically identifying the emetic strains among B. cereus strains from various materials associated with food poisonings. All 50 of the emetic strains showed a positive reaction to the assay, but all 50 diarrheal strains had a negative reaction. The bacterial counts of 108 cfu/ml in enrichment broth and 109 cfu/ml in food-containing enrichment were required for the identification of emetic B. cereus. The present assay could identify easily and specifically the emetic type of B. cereus within 30 min by a pure culture without special techniques and instruments.
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Affiliation(s)
- Shigeko Ueda
- Laboratory of Hygiene, Kagawa Nutrition University, Chiyoda, Sakado-Shi, Saitama, Japan.
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Chen N, Leng YP, Xu WJ, Luo JD, Chen MS, Xiong Y. Contribution of endogenous inhibitor of nitric oxide synthase to hepatic mitochondrial dysfunction in streptozotocin-induced diabetic rats. Cell Physiol Biochem 2011; 27:341-52. [PMID: 21471723 DOI: 10.1159/000327960] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/02/2011] [Indexed: 11/19/2022] Open
Abstract
AIMS Mitochondrial dysfunction plays important roles in the development of diabetes. Elevated nitric oxide (NO) synthase inhibitor asymmetric dimethylarginine (ADMA) has been shown to be closely related to diabetes. But the relationship between them in diabetes has not been determined. This study was to explore the role of ADMA in hepatic mitochondrial dysfunction and its potential mechanisms in diabetic rats and hepatocytes. METHODS Respiratory enzymes activities, mitochondrial transmembrane potential and ATP content were measured to evaluate mitochondrial function. The copy number ratio of mitochondrial gene to nuclear gene was used to represent mitochondrial biogenesis. The activity of superoxide dismutase and malondialdehyde content were detected to reflect oxidative stress. Furthermore, changes in ADMA and NO contents, uncoupling protein 2 (UCP2) and peroxisome proliferator-activated receptor-γ coactivator 1α (PGC-1α) transcriptions were determined. RESULTS Elevated ADMA levels in serum of diabetic rats were found to be associated with hepatic mitochondrial dysfunction reflected by reductions of respiratory enzyme activities, mitochondrial membrane potential and ATP contents. Similar mitochondrial dysfunction also occurred in ADMA-treated hepatocytes. The mitochondrial dysfunction observed in diabetic rats or hepatocytes was accompanied with suppressions of mitochondrial biogenesis, PGC-1α transcription and NO synthesis as well as enhances of UCP 2 transcription and oxidative stress. These effects of ADMA could be attenuated by treatments with antioxidant or NO donor. CONCLUSIONS These results indicate that elevated endogenous ADMA contributes to hepatic mitochondrial dysfunction in diabetic rats, and underlying mechanisms may be related to the suppression of mitochondrial biogenesis and mitochondrial uncoupling via inhibiting NO synthesis and enhancing oxidative stress.
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Affiliation(s)
- Na Chen
- Department of Pharmacology, Guangzhou Medical University, Guangzhou, PR China
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16
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Delbrassinne L, Andjelkovic M, Rajkovic A, Bottledoorn N, Mahillon J, Van Loco J. Follow-up of the Bacillus cereus emetic toxin production in penne pasta under household conditions using liquid chromatography coupled with mass spectrometry. Food Microbiol 2011; 28:1105-9. [PMID: 21569959 DOI: 10.1016/j.fm.2011.02.014] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2010] [Revised: 02/24/2011] [Accepted: 02/25/2011] [Indexed: 11/26/2022]
Abstract
Two outbreak-related Bacillus cereus emetic strains were investigated for their growth and cereulide production potential in penne pasta at 4, 8 and 25 °C during 7-day storage. Cereulide production was detected and quantified by LC-MS method (LOD of 1 ng/ml, LOQ of 5 ng/ml) and growth was determined by culture-based enumeration. Inoculated B. cereus strains (10(5) CFU/g) were able to reach counts of more than 10(8) CFU/g and cereulide production of about 500 ng/g already after 3 days of storage at 25 °C. Interestingly, a constant increase of the toxin was noticed during incubation at ambient temperature storage: the cereulide was continuously produced during the bacterial stationary growth phase reaching maximal amounts at the end of the experiment (7 days, concentration of about 1000 ng/g). Strictly respected cold chain temperature as 4 °C did not allow any detectable cereulide production for any of the two tested strains. At the limited temperature abuse of 8 °C, a detectable amount of cereulide was observed after two days for one of the strain (TIAC303) (<LOQ). These results confirm that cereulide production is controlled by multiple factors (from type of strain to temperature) and that prolonged storage time plays a crucial role for consumer safety.
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Affiliation(s)
- Laurence Delbrassinne
- Scientific Institute of Public Health, 14 rue Juliette Wytsman, B-1050 Bruxelles, Belgium
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17
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Shiota M, Saitou K, Mizumoto H, Matsusaka M, Agata N, Nakayama M, Kage M, Tatsumi S, Okamoto A, Yamaguchi S, Ohta M, Hata D. Rapid detoxification of cereulide in Bacillus cereus food poisoning. Pediatrics 2010; 125:e951-5. [PMID: 20194285 DOI: 10.1542/peds.2009-2319] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Bacillus cereus is recognized as a major pathogenic bacterium that causes food poisoning and produces gastrointestinal diseases of 2 types: emetic and diarrheal. The emetic type, which is often linked to pasta and rice, arises from a preformed toxin, cereulide, in food. Rapid and accurate diagnostic methods for this emetic toxin are important but are limited. Here we describe 3 patients with B cereus food poisoning in which cereulide was detected and measured sequentially. Three family members began to vomit frequently 30 minutes after consuming reheated fried rice. After 6 hours, a 1-year-old brother died of acute encephalopathy. A 2-year-old sister who presented with unconsciousness recovered rapidly after plasma exchange and subsequent hemodialysis. Their mother recovered soon by fluid therapy. From leftover fried rice and the children's stomach contents, B cereus was isolated. Serum cereulide was detected in both children; it decreased to an undetected level in the sister. These cases highlight the importance of measuring the value of cereulide, which would reflect the severity of B cereus emetic food poisoning. The cases also suggest the possible role of blood-purification therapy in severe cases.
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Affiliation(s)
- Mitsutaka Shiota
- Kitano Hospital, Department of Pediatrics, 2-4-20, Ohgimachi, Kita-ku, Osaka City, Osaka, Japan.
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18
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Bauer T, Stark T, Hofmann T, Ehling-Schulz M. Development of a stable isotope dilution analysis for the quantification of the Bacillus cereus toxin cereulide in foods. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2010; 58:1420-1428. [PMID: 19994891 DOI: 10.1021/jf9033046] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
An increasing number of severe food borne intoxications are caused by a highly stable depsipeptide, named cereulide, which is produced by emetic Bacillus cereus strains. As cereulide poses a health risk to humans, the development of an appropriate method for the analysis of this toxin is mandatory. Therefore, the reference material of cereulide as well as its (13)C(6)-isotopologue was prepared by means of a biosynthetic approach using a B. cereus culture, followed by a rapid but efficient downstream purification. After structure confirmation by means of liquid chromatography (LC)-time-of-flight mass spectrometry, LC-tandem mass spectrometry, and one-/two-dimensional NMR spectroscopy, a stable isotope dilution analysis (SIDA) was developed for the quantification of cereulide in foods using the (13)C(6)-cereulide as the internal standard. Validation experiments were performed, and the data were compared to the quantitative analysis using the structurally related valinomycin instead of the (13)C(6)-cereulide as an internal standard. Trueness, repeatability, and reproducibility expressed as relative standard deviation showed values <10 or <8% for valinomycin or <8% for (13)C(6)-cereulide, respectively. Furthermore, the MS response of the valinomycin was found to be significantly influenced by the food matrix, thus leading to rather low recovery rates of 91% from boiled rice and 80% from boiled rice supplemented with 10% sunflower oil. In comparison, the use of (13)C(6)-cereulide as an internal standard gave good recovery rates of 104 and 111% from both matrices, thus demonstrating the robustness and accuracy of the developed SIDA.
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Affiliation(s)
- Tobias Bauer
- Microbiology Unit, ZIEL Nutrition and Food Research Center, WZW, Technische Universitat Munchen, 85354 Freising, Germany
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19
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Stenfors Arnesen LP, Fagerlund A, Granum PE. From soil to gut:Bacillus cereusand its food poisoning toxins. FEMS Microbiol Rev 2008; 32:579-606. [DOI: 10.1111/j.1574-6976.2008.00112.x] [Citation(s) in RCA: 676] [Impact Index Per Article: 42.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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20
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Tasduq SA, Kaiser PJ, Gupta BD, Gupta VK, Johri RK. Negundoside, an iridiod glycoside from leaves of Vitex negundo, protects human liver cells against calcium-mediated toxicity induced by carbon tetrachloride. World J Gastroenterol 2008; 14:3693-709. [PMID: 18595136 PMCID: PMC2719232 DOI: 10.3748/wjg.14.3693] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM: To evaluate the protective effect of 2'-p-hydroxybenzoylmussaenosidic acid [negundoside (NG), against carbon tetrachloride (CCl4)-induced toxicity in HuH-7 cells.
METHODS: CCl4 is a well characterized hepatotoxin, and inducer of cytochrome P450 2E1 (CYP2E1)-mediated oxidative stress. In addition, lipid peroxidation and accumulation of intracellular calcium are important steps in the pathway involved in CCl4 toxicity. Liver cells (HuH-7) were treated with CCl4, and the mechanism of the cytoprotective effect of NG was assessed. Silymarin, a known hepatoprotective drug, was used as control.
RESULTS: NG protected HuH-7 cells against CCl4 toxicity and loss of viability without modulating CYP2E1 activity. Prevention of CCl4 toxicity was associated with a reduction in oxidative damage as reflected by decreased generation of reactive oxygen species (ROS), a decrease in lipid peroxidation and accumulation of intracellular Ca2+ levels and maintenance of intracellular glutathione homeostasis. Decreased mitochondrial membrane potential (MMP), induction of caspases mediated DNA fragmentation and cell cycle arrest, as a result of CCl4 treatment, were also blocked by NG. The protection afforded by NG seemed to be mediated by activation of cyclic adenosine monophosphate (cAMP) synthesis and inhibition of phospholipases (cPLA2).
CONCLUSION: NG exerts a protective effect on CYP2E1-dependent CCl4 toxicity via inhibition of lipid peroxidation, followed by an improved intracellular calcium homeostasis and inhibition of Ca2+-dependent proteases.
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Liu Y, Elsholz B, Enfors SO, Gabig-Ciminska M. Confirmative electric DNA array-based test for food poisoning Bacillus cereus. J Microbiol Methods 2007; 70:55-64. [PMID: 17466398 DOI: 10.1016/j.mimet.2007.03.011] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2006] [Revised: 02/20/2007] [Accepted: 03/20/2007] [Indexed: 11/18/2022]
Abstract
Detection of the full set of toxin encoding genes involved in gastrointestinal diseases caused by B. cereus was performed. Eight genes determining the B. cereus pathogenicity, which results in diarrhea or emesis, were simultaneously evaluated on a 16-position electrical chip microarray. The DNA analyte preparation procedure comprising first 5 min of ultrasonic treatment, DNA extraction, and afterwards an additional 10 min sonication, was established as the most effective way of sample processing. No DNA amplification step prior to the analysis was included. The programmed assay was carried out within 30 min, once the DNA analyte from 10(8) bacterial cells, corresponding to one agar colony, was subjected to the assay. In general, this work represents a mature analytical way for DNA review. It can be used under conditions that require almost immediate results.
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Affiliation(s)
- Yanling Liu
- School of Biotechnology, Royal Institute of Technology (KTH), S-10691, Stockholm, Sweden
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22
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Andersson MA, Hakulinen P, Honkalampi-Hämäläinen U, Hoornstra D, Lhuguenot JC, Mäki-Paakkanen J, Savolainen M, Severin I, Stammati AL, Turco L, Weber A, von Wright A, Zucco F, Salkinoja-Salonen M. Toxicological profile of cereulide, the Bacillus cereus emetic toxin, in functional assays with human, animal and bacterial cells. Toxicon 2007; 49:351-67. [PMID: 17156808 DOI: 10.1016/j.toxicon.2006.10.006] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2005] [Revised: 10/20/2006] [Accepted: 10/23/2006] [Indexed: 11/27/2022]
Abstract
Some strains of the endospore-forming bacterium Bacillus cereus produce a heat-stable ionophoric peptide, cereulide, of high human toxicity. We assessed cell toxicity of cereulide by measuring the toxicities of crude extracts of cereulide producing and non-producing strains of B. cereus, and of pure cereulide, using cells of human, animal and bacterial origins. Hepatic cell lines and boar sperm, with cytotoxicity and sperm motility, respectively, as the end points, were inhibited by 1 nM of cereulide present as B. cereus extract. RNA synthesis and cell proliferation in HepG2 cells was inhibited by 2 nM of cereulide. These toxic effects were explainable by the action of cereulide as a high-affinity mobile K+ carrier. Exposure to cereulide containing extracts of B. cereus caused neither activation of CYP1A1 nor genotoxicity (comet assay, micronucleus test) at concentrations below those that were cytotoxic (0.6 nM cereulide). Salmonella typhimurium reverse mutation (Ames) test was negative. Exposure of Vibrio fischeri to extracts of B. cereus caused stimulated luminescence up to 600%, independent on the presence of cereulide, but purified cereulide inhibited the luminescence with an IC(50% (30 min)) of 170 nM. Thus the luminescence-stimulating B. cereus substance(s) masked the toxicity of cereulide in B. cereus extracts to V. fischeri.
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Affiliation(s)
- Maria A Andersson
- Department of Applied Chemistry and Microbiology, University of Helsinki, Biocenter, P.O. Box 56, Fi 00014 Helsinki University, Finland
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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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