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Couto CC, Santos TF, Mamede AMGN, Oliveira TC, Souza AM, Freitas-Silva O, Oliveira EMM. Coffea arabica and C. canephora discrimination in roasted and ground coffee from reference material candidates by real-time PCR. Food Res Int 2018; 115:227-233. [PMID: 30599935 DOI: 10.1016/j.foodres.2018.08.086] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2018] [Revised: 08/09/2018] [Accepted: 08/27/2018] [Indexed: 12/12/2022]
Abstract
To produce specific desirable coffee blends, Coffea arabica and C. canephora are mixed each other, in some cases to suit consumer preference, but in others to reduce production costs. In this scenario, the aim of this work was to evaluate standard candidate reference materials (RMc) for analysis of different blends of roasted and ground coffee. For this purpose, we analyzed different percentages of C. arabica and C. canephora (100:0; 50:50; 25:75; and 0:100, respectively). These RMc samples were developed in a previous study with green coffee beans submitted to medium roasting. In this work, coffee species differentiation (C. arabica and C. canephora) was analyzed by real-time PCR, using specific primers previously developed, called ARA primers. The RMc material with 100% C. canephora did not present amplification, in contrast with the samples containing C. arabica, which all presented amplification. These results indicate the specificity of ARA primers for C. arabica and that the detection system assay can be used as a promising molecular tool to identify and quantify percentages of C. arabica in different coffee blends.
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Affiliation(s)
- C C Couto
- Food and Nutrition Graduate Program, Federal University of State of Rio de Janeiro, UNIRIO. Av. Pasteur, 296, 22290-240 Rio de Janeiro, Brazil
| | - T F Santos
- Nutrition Institute, Centre of Health Sciences, Federal University of Rio de Janeiro, Bloco J - Av. Carlos Chagas Filho 373, Ilha do Fundão, Rio de Janeiro, Brazil
| | - A M G N Mamede
- Federal Institute of Education Science and Technology of Bahia, Campus Barreiras Rua Gileno de Sá Oliveira, 271, 47808-006 Barreiras, Bahia, Brazil
| | - T C Oliveira
- Embrapa Agroindústria de Alimentos, Av. das Américas, 29501, 23020-470 Rio de Janeiro, Brazil
| | - A M Souza
- Embrapa Agroindústria de Alimentos, Av. das Américas, 29501, 23020-470 Rio de Janeiro, Brazil
| | - O Freitas-Silva
- Food and Nutrition Graduate Program, Federal University of State of Rio de Janeiro, UNIRIO. Av. Pasteur, 296, 22290-240 Rio de Janeiro, Brazil; Embrapa Agroindústria de Alimentos, Av. das Américas, 29501, 23020-470 Rio de Janeiro, Brazil.
| | - E M M Oliveira
- Embrapa Agroindústria de Alimentos, Av. das Américas, 29501, 23020-470 Rio de Janeiro, Brazil
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Manzano M, Viezzi S, Mazerat S, Marks RS, Vidic J. Rapid and label-free electrochemical DNA biosensor for detecting hepatitis A virus. Biosens Bioelectron 2018; 100:89-95. [DOI: 10.1016/j.bios.2017.08.043] [Citation(s) in RCA: 66] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2017] [Revised: 08/16/2017] [Accepted: 08/18/2017] [Indexed: 02/01/2023]
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Singh AK, Sun X, Bai X, Kim H, Abdalhaseib MU, Bae E, Bhunia AK. Label-free, non-invasive light scattering sensor for rapid screening of Bacillus colonies. J Microbiol Methods 2015; 109:56-66. [DOI: 10.1016/j.mimet.2014.12.012] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2014] [Revised: 12/17/2014] [Accepted: 12/18/2014] [Indexed: 11/26/2022]
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Kim H, Singh AK, Bhunia AK, Bae E. Laser-induced speckle scatter patterns in Bacillus colonies. Front Microbiol 2014; 5:537. [PMID: 25352840 PMCID: PMC4196546 DOI: 10.3389/fmicb.2014.00537] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2014] [Accepted: 09/26/2014] [Indexed: 11/20/2022] Open
Abstract
Label-free bacterial colony phenotyping technology called BARDOT (Bacterial Rapid Detection using Optical scattering Technology) provided successful classification of several different bacteria at the genus, species, and serovar level. Recent experiments with colonies of Bacillus species provided strikingly different characteristics of elastic light scatter (ELS) patterns, which were comprised of random speckles compared to other bacteria, which are dominated by concentric rings and spokes. Since this laser-based optical sensor interrogates the whole volume of the colony, 3-D information of micro- and macro-structures are all encoded in the far-field scatter patterns. Here, we present a theoretical model explaining the underlying mechanism of the speckle formation by the colonies from Bacillus species. Except for Bacillus polymyxa, all Bacillus spp. produced random bright spots on the imaging plane, which presumably dependent on the cellular and molecular organization and content within the colony. Our scatter model-based analysis revealed that colony spread resulting in variable surface roughness can modify the wavefront of the scatter field. As the center diameter of the Bacillus spp. colony grew from 500 to 900 μm, average speckles area decreased two-fold and the number of small speckles increased seven-fold. In conclusion, as Bacillus colony grows, the average speckle size in the scatter pattern decreases and the number of smaller speckle increases due to the swarming growth characteristics of bacteria within the colony.
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Affiliation(s)
- Huisung Kim
- Applied Optics Laboratory, School of Mechanical Engineering, Purdue University West Lafayette, IN, USA
| | - Atul K Singh
- Molecular Food Microbiology Laboratory, Department of Food Science, Purdue University West Lafayette, IN, USA
| | - Arun K Bhunia
- Molecular Food Microbiology Laboratory, Department of Food Science, Purdue University West Lafayette, IN, USA
| | - Euiwon Bae
- Applied Optics Laboratory, School of Mechanical Engineering, Purdue University West Lafayette, IN, USA
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Manzano M, Giusto C, Bartolomeoli I, Buiatti S, Comi G. Microbiological Analyses of Dry and Slurry Yeasts for Brewing. JOURNAL OF THE INSTITUTE OF BREWING 2012. [DOI: 10.1002/j.2050-0416.2005.tb00667.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Manzano M, Iacumin L, Vendrames M, Cecchini F, Comi G, Buiatti S. Craft Beer Microflora Identification Before and After a Cleaning Process. JOURNAL OF THE INSTITUTE OF BREWING 2012. [DOI: 10.1002/j.2050-0416.2011.tb00478.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Resistance of Bacillus cereus and its enterotoxin genes in ready-to-eat foods to γ-irradiation. Food Sci Biotechnol 2012. [DOI: 10.1007/s10068-012-0056-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
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Oukacine F, Quirino JP, Garrelly L, Romestand B, Zou T, Cottet H. Simultaneous Electrokinetic and Hydrodynamic Injection for High Sensitivity Bacteria Analysis in Capillary Electrophoresis. Anal Chem 2011; 83:4949-54. [DOI: 10.1021/ac200684t] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Farid Oukacine
- Institut des Biomolécules Max Mousseron (IBMM), UMR 5247 CNRS-Université de Montpellier1-Université de Montpellier 2, Place Eugène Bataillon, case courrier 1706, 34095 Montpellier Cedex 5, France
- COLCOM SARL, Cap Alpha Avenue de l’Europe, Clapiers 34940 Montpellier, France
| | - Joselito P. Quirino
- Australian Centre for Research on Separation Science, School of Chemistry, University of Tasmania, Hobart, Australia 7001
| | - Laurent Garrelly
- COLCOM SARL, Cap Alpha Avenue de l’Europe, Clapiers 34940 Montpellier, France
| | - Bernard Romestand
- Laboratoire Ecosystèmes Lagunaires, UMR 5119, Université de Montpellier 2, 34095 Montpellier, France
| | - Tao Zou
- Institut des Biomolécules Max Mousseron (IBMM), UMR 5247 CNRS-Université de Montpellier1-Université de Montpellier 2, Place Eugène Bataillon, case courrier 1706, 34095 Montpellier Cedex 5, France
| | - Hervé Cottet
- Institut des Biomolécules Max Mousseron (IBMM), UMR 5247 CNRS-Université de Montpellier1-Université de Montpellier 2, Place Eugène Bataillon, case courrier 1706, 34095 Montpellier Cedex 5, France
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Kim SK, Kim KP, Jang SS, Shin EM, Kim MJ, Oh S, Ryu S. Prevalence and toxigenic profiles of Bacillus cereus isolated from dried red peppers, rice, and Sunsik in Korea. J Food Prot 2009; 72:578-82. [PMID: 19343947 DOI: 10.4315/0362-028x-72.3.578] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Bacillus cereus is a spore-forming foodborne pathogen responsible for diarrheal and emetic types of food poisoning. Intoxication is caused by various enterotoxins or by emetic toxin. Because of its widespread presence and the ability to form heat-stable endospores in a relatively short time, B. cereus has been difficult to control. In this study, 21 rice and 36 Sunsik (a mixture of powdered raw grains) samples were examined for the prevalence of B. cereus. A multiplex PCR assay was used to evaluate the distribution of 10 different toxigenicity-related genes among 1,082 B. cereus strains isolated from dried red peppers (919 isolates), rice (98 isolates), and Sunsik (65 isolates). The results suggest that (i) the examined foods were free of the emetic toxin but not free of enterotoxins and (ii) the distribution of enterotoxigenic genes was significantly different among the B. cereus isolates from various sources.
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Affiliation(s)
- Sung Ki Kim
- Department of Food and Animal Biotechnology, Center for Agricultural Biomaterials, and Research Institute for Agriculture and Life Sciences, Seoul National University, Seoul 151-921, Korea
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Manzano M, Giusto C, Iacumin L, Cantoni C, Comi G. Molecular methods forBacillus cereusandBacillus thuringiensisfrom humans, pesticides and foods, differentiation. ACTA ALIMENTARIA 2009. [DOI: 10.1556/aalim.2008.0022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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12
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Chu PT, Hsieh MF, Yin SY, Wen HW. Development of a rapid and sensitive immunomagnetic-bead based assay for detecting Bacillus cereus in milk. Eur Food Res Technol 2009. [DOI: 10.1007/s00217-009-1027-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Choo E, Jang SS, Kim K, Lee KG, Heu S, Ryu S. Prevalence and genetic diversity of Bacillus cereus in dried red pepper in Korea. J Food Prot 2007; 70:917-22. [PMID: 17477261 DOI: 10.4315/0362-028x-70.4.917] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Bacillus cereus is a foodborne spore-forming bacterial pathogen that is ubiquitous in the natural environment. Infections with this pathogen manifest as diarrheal or emetic types of food poisoning. In this study, 140 samples of dried red pepper purchased in Korea were assayed for the presence of B. cereus according to the U.S. Food and Drug Administration standard culture method. A multiplex PCR assay was developed for the rapid confirmation of B. cereus as an alternative to conventional biochemical confirmation tests. The genetic diversity of B. cereus isolates was investigated using a random amplified polymorphic DNA (RAPD) assay. B. cereus was found in 84.3% of the dried red pepper samples, with an average concentration of 1.9 x 10(4) CFU/g. B. cereus could be detected and distinguished from B. thuringiensis in the multiplex PCR assay by using the BCFW1 plus BCrevnew and the K3 plus K5 primer sets designed to detect the gyrB gene of B. cereus and B. thuringiensis and the cry gene of B. thuringiensis. A RAPD assay using the OPG 16 and MUP 3 primers was used to successfully distinguish among isolates, thus elucidating the genetic diversity of B. cereus isolates. The discriminating ability of the OPG 16 primer (142 types) was about threefold higher than that of MUP 3 (52 types) in the RAPD assay.
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Affiliation(s)
- Euiyoung Choo
- Department of Food and Animal Biotechnology, School of Agricultural Biotechnology and Center for Agricultural Biomaterials, Seoul National University, San 56-1, Shillim-dong, Kwanak-gu, Seoul 151-921, Korea
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Application of PCR-DGGE for the identification of lactic acid bacteria in acitve dry wine yeasts. ANN MICROBIOL 2007. [DOI: 10.1007/bf03175063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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Murphy J, Devane ML, Robson B, Gilpin BJ. Genotypic characterization of bacteria cultured from duck faeces. J Appl Microbiol 2006; 99:301-9. [PMID: 16033461 DOI: 10.1111/j.1365-2672.2005.02590.x] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
AIMS To characterize the bacterial composition of mallard duck faeces and determine if novel bacterial species are present that could be utilized as potential indicators of avian faecal contamination. METHODS AND RESULTS Combined samples of fresh faeces from four ducks were serially diluted and plated onto six different media selected to allow the growth of a range of organisms at 42 degrees C under three atmospheric conditions: aerobic, microaerophilic and anaerobic. Forty-seven morphologically dissimilar isolates were purified and partial sequencing of the16S rRNA indicated at least 31 bacterial species. Twenty of these could be identified to the species level including pathogenic species of Bacillus, Campylobacter, Clostridium and Streptococcus. Other species identified included: Enterococcus, Escherichia, Megamonas, Cellulosimicrobium, Neisseria, Staphylococcus and Veillonella. Potentially novel species, which could represent bacteria specific to avian fauna included Bacillus, Corynebacterium, Macrococcus and Peptostreptococcus, while four isolates had <97% similarity to known bacterial species in the available databases. CONCLUSION A survey of the natural microflora of the mallard duck and its hybrid with the grey duck identified both bacteria that are potentially human pathogenic and putative novel bacteria species as determined by 16S rRNA sequencing. SIGNIFICANCE AND IMPACT OF THE STUDY This study provides further evidence that duck faeces is a potential human health hazard, and has identified bacteria potentially useful for distinguishing duck faeces from other faecal sources.
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Affiliation(s)
- J Murphy
- Institute of Environmental Science and Research Limited, Christchurch Science Centre, Christchurch, New Zealand
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