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Chiu T, Green T, Zhu MJ. Detection and tracing of Paucilactobacillus wasatchensis from dairy farm to creamery using N-acetyltransferase (NAT) gene-derived primers. Int Dairy J 2023. [DOI: 10.1016/j.idairyj.2023.105613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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2
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Detection and identification of Lactobacillus acidophilus species and its commercial probiotic strains using CRISPR loci-based amplicon analysis. Lebensm Wiss Technol 2022. [DOI: 10.1016/j.lwt.2022.114166] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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3
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Magra T, Soultos N, Dovas C, Papavergou E, Lazou T, Apostolakos I, Dimitreli G, Ambrosiadis I. Dry Fermented Sausages with Total Replacement of Fat by Extra Virgin Olive Oil Emulsion and Indigenous Lactic Acid Bacteria. Food Technol Biotechnol 2021; 59:267-281. [PMID: 34759759 PMCID: PMC8542180 DOI: 10.17113/ftb.59.03.21.7114] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2020] [Accepted: 06/23/2021] [Indexed: 11/30/2022] Open
Abstract
Research background Formulations based on vegetable or fish oil and modifications in the production technology of dry fermented sausages have emerged in recent years aiming to achieve the desirable target of reducing the fat content of these meat products. However, previous efforts have confronted many difficulties, such as high mass loss and unacceptable appearance due to intensely wrinkled surfaces and case hardening. The objective of this study is to produce and evaluate dry fermented sausages by utilising a meat protein-olive oil emulsion as fat substitute and indigenous lactic acid bacteria (LAB) with probiotic properties isolated from traditional Greek meat products. Experimental approach A novel formulation with extra virgin olive oil and turkey protein was developed to totally replace the conventionally added pork fat. Probiotic and safety characteristics of autochthonous LAB isolates from spontaneously fermented sausages were evaluated and three LAB isolates were finally selected as starter cultures. Physicochemical, microbiological and sensory analyses were carried out in all treatments (control, Lactobacillus acidophilus, L. casei, L. sakei and Pediococcus pentosaceus) during fermentation. Results and conclusions Ready-to-eat sausages were found to be microbiologically stable. The olive oil-based formulation produced in this study generated a mosaic pattern visible in the sliced product simulating the fat in conventional fermented sausages and was regarded as an ideal fat substitute for the production of fermented sausages. An autochthonous isolate of Lactobacillus casei adapted the best to the final products as it was molecularly identified to be present in the highest counts among the LAB isolates used as starter cultures. Novelty and scientific contribution Α novel and high-quality dry fermented meat product was produced by replacing the added pork fat with a fat substitute based on a meat protein-olive oil emulsion. Autochthonous LAB with in vitro probiotic properties could have a potential use in large-scale novel dry fermented sausage production. Such isolates could be used as starters in an effort to standardise the production process and retain the typical organoleptic and sensory characteristics. Moreover, isolates like L. casei 62 that survived in high counts in the final products can increase the safety of fermented sausages by competing not only with pathogens but also with the indigenous microbiota and could have a potential functional value for the consumer.
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Affiliation(s)
- Taxiarchoula Magra
- Department of Hygiene and Technology of Foods of Animal Origin, School of Veterinary Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
| | - Nikolaos Soultos
- Department of Hygiene and Technology of Foods of Animal Origin, School of Veterinary Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
| | - Chrysostomos Dovas
- Diagnostic Laboratory, School of Veterinary Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki, 54627 Thessaloniki, Greece
| | - Ekaterini Papavergou
- Department of Hygiene and Technology of Foods of Animal Origin, School of Veterinary Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
| | - Thomai Lazou
- Department of Hygiene and Technology of Foods of Animal Origin, School of Veterinary Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
| | - Ilias Apostolakos
- Department of Hygiene and Technology of Foods of Animal Origin, School of Veterinary Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
| | - Georgia Dimitreli
- Central Research Laboratory for the Physical and Chemical Testing of Foods, Department of Food Science and Technology, International Hellenic University, P.O. Box 141, 57400 Thessaloniki, Greece
| | - Ioannis Ambrosiadis
- Department of Hygiene and Technology of Foods of Animal Origin, School of Veterinary Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
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Ali MA, Zhang Z, Li H, Zhang Y, Fu S, Zhang W, Man C, Jiang Y. A Culture-Independent Method for Enumeration of Viable Load of Lactobacillus acidophilus NCFM by using Real-Time PCR. INTERNATIONAL JOURNAL OF FOOD ENGINEERING 2019. [DOI: 10.1515/ijfe-2019-0079] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
AbstractThe study was performed to develop a non-culture method to quantify viable loads of Lactobacillus acidophilus NCFM using RNA-based molecular technique. The ‘growth curve’ and ‘cycle threshold curve’ were developed respectively by plate counting and using cycle threshold (CT) values. ‘Standard curve’ was constructed using cells per milliliter and relative CT values. A maximum viable count (1.5 ± 0.15) × 1010 cells/mL with a minimum CT value 20.18 ± 0.56 was achieved following 18 h of growth. The two parameters were inversely proportional to each other over the exponential growth. The ‘standard curve’ corresponded to equation y = 2E + 28e−2.034x (y = cells/mL, x = CT value; R2 = 0.993), and no sample showed significant difference between ‘plate count’ and relative ‘PCR count’ following the validation process. Industrial adaptation of this method in dairy processing could potentially contribute to a faster enumeration of viable L. acidophilus NCFM compared to plate counting.
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Affiliation(s)
- Md. Aslam Ali
- College of Food Science, Northeast Agricultural University, Harbin150030, China
| | - Ziwei Zhang
- College of Food Science, Northeast Agricultural University, Harbin150030, China
| | - Hongfu Li
- College of Food Science, Northeast Agricultural University, Harbin150030, China
| | - Yashuo Zhang
- College of Food Science, Northeast Agricultural University, Harbin150030, China
| | - Shiqian Fu
- College of Food Science, Northeast Agricultural University, Harbin150030, China
| | - Wei Zhang
- College of Food Science, Northeast Agricultural University, Harbin150030, China
| | - Chaoxin Man
- College of Food Science, Northeast Agricultural University, Harbin150030, China
| | - Yujun Jiang
- College of Food Science, Northeast Agricultural University, Harbin150030, China
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5
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Mianzhi Y, Shah NP. Contemporary nucleic acid-based molecular techniques for detection, identification, and characterization of Bifidobacterium. Crit Rev Food Sci Nutr 2017; 57:987-1016. [PMID: 26565761 DOI: 10.1080/10408398.2015.1023761] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Bifidobacteria are one of the most important bacterial groups found in the gastrointestinal tract of humans. Medical and food industry researchers have focused on bifidobacteria because of their health-promoting properties. Researchers have historically relied on classic phenotypic approaches (culture and biochemical tests) for detection and identification of bifidobacteria. Those approaches still have values for the identification and detection of some bifidobacterial species, but they are often labor-intensive and time-consuming and can be problematic in differentiating closely related species. Rapid, accurate, and reliable methods for detection, identification, and characterization of bifidobacteria in a mixed bacterial population have become a major challenge. The advent of nucleic acid-based molecular techniques has significantly advanced isolation and detection of bifidobacteria. Diverse nucleic acid-based molecular techniques have been employed, including hybridization, target amplification, and fingerprinting. Certain techniques enable the detection, characterization, and identification at genus-, species-, and strains-levels, whereas others allow typing of species or strains of bifidobacteria. In this review, an overview of methodological principle, technique complexity, and application of various nucleic acid-based molecular techniques for detection, identification, and characterization of bifidobacteria is presented. Advantages and limitations of each technique are discussed, and significant findings based on particular techniques are also highlighted.
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Affiliation(s)
- Yao Mianzhi
- a Food and Nutritional Science , School of Biological Sciences, The University of Hong Kong , Hong Kong
| | - Nagendra P Shah
- a Food and Nutritional Science , School of Biological Sciences, The University of Hong Kong , Hong Kong
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6
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Foschi C, Laghi L, Parolin C, Giordani B, Compri M, Cevenini R, Marangoni A, Vitali B. Novel approaches for the taxonomic and metabolic characterization of lactobacilli: Integration of 16S rRNA gene sequencing with MALDI-TOF MS and 1H-NMR. PLoS One 2017; 12:e0172483. [PMID: 28207855 PMCID: PMC5312945 DOI: 10.1371/journal.pone.0172483] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2016] [Accepted: 02/06/2017] [Indexed: 02/07/2023] Open
Abstract
Lactobacilli represent a wide range of bacterial species with several implications for the human host. They play a crucial role in maintaining the ecological equilibrium of different biological niches and are essential for fermented food production and probiotic formulation. Despite the consensus about the ‘health-promoting’ significance of Lactobacillus genus, its genotypic and phenotypic characterization still poses several difficulties. The aim of this study was to assess the integration of different approaches, genotypic (16S rRNA gene sequencing), proteomic (MALDI-TOF MS) and metabolomic (1H-NMR), for the taxonomic and metabolic characterization of Lactobacillus species. For this purpose we analyzed 40 strains of various origin (intestinal, vaginal, food, probiotics), belonging to different species. The high discriminatory power of MALDI-TOF for species identification was underlined by the excellent agreement with the genotypic analysis. Indeed, MALDI-TOF allowed to correctly identify 39 out of 40 Lactobacillus strains at the species level, with an overall concordance of 97.5%. In the perspective to simplify the MALDI TOF sample preparation, especially for routine practice, we demonstrated the perfect agreement of the colony-picking from agar plates with the protein extraction protocol. 1H-NMR analysis, applied to both culture supernatants and bacterial lysates, identified a panel of metabolites whose variations in concentration were associated with the taxonomy, but also revealed a high intra-species variability that did not allow a species-level identification. Therefore, despite not suitable for mere taxonomic purposes, metabolomics can be useful to correlate particular biological activities with taxonomy and to understand the mechanisms related to the antimicrobial effect shown by some Lactobacillus species.
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Affiliation(s)
- Claudio Foschi
- Microbiology, DIMES, University of Bologna, Bologna, Italy
| | - Luca Laghi
- Centre of Foodomics, Department of Agro-Food Science and Technology, University of Bologna, Bologna, Italy
| | - Carola Parolin
- Department of Pharmacy and Biotechnology, University of Bologna, Bologna, Italy
| | - Barbara Giordani
- Department of Pharmacy and Biotechnology, University of Bologna, Bologna, Italy
| | - Monica Compri
- Microbiology, DIMES, University of Bologna, Bologna, Italy
| | | | | | - Beatrice Vitali
- Department of Pharmacy and Biotechnology, University of Bologna, Bologna, Italy
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7
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Blandino G, Fazio D, Petronio GP, Inturri R, Tempera G, Furneri PM. Labeling quality and molecular characterization studies of products containing Lactobacillus spp. strains. Int J Immunopathol Pharmacol 2016; 29:121-8. [PMID: 26667227 PMCID: PMC5806746 DOI: 10.1177/0394632015600534] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2015] [Accepted: 07/23/2015] [Indexed: 11/17/2022] Open
Abstract
The objective of the study was to characterize at species level by phenotypic and different molecular methods the strains of Lactobacillus spp. used as constituents of five oral and four vaginal products. Susceptibilities to representative antibiotics were evaluated. In addition, total viable counts at mid and 3 months to deadline of shelf life, in the different formulations and the presence of eventual contaminant microorganisms were investigated.In all oral products the molecular characterization at species level of the strains of Lactobacillus spp. confirmed the strains stated on the label, except for one strain cited on the label as Lactobacillus casei, that our study characterized as Lactobacillus paracasei. In oral products total viable cell content complied with content claimed on the label. In three out four vaginal products (one product claimed "bacillo di Döderlein"), molecular characterization complied with the bacterial name stated on the label. Two vaginal products reported viable counts on the label that were confirmed by our study. The other vaginal products, which did not report bacterial counts on the label, showed a similar decrease of viable counts at different dates to deadline compared to the others. From all the tested products, contaminant microorganisms and acquired resistance to representative antibiotics by the probiotic strains were not detected.
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Affiliation(s)
- Giovanna Blandino
- Dipartimento di Scienze Biomediche e Biotecnologiche, Sezione di Microbiologia, Università degli Studi di Catania, Catania, Italy
| | - Davide Fazio
- Dipartimento di Scienze Biomediche e Biotecnologiche, Sezione di Microbiologia, Università degli Studi di Catania, Catania, Italy
| | - Giulio Petronio Petronio
- Dipartimento di Scienze Biomediche e Biotecnologiche, Sezione di Microbiologia, Università degli Studi di Catania, Catania, Italy IRCCS San Raffaele Pisana, BioBIM - Multidisciplinary Interinstitutional BioBank, Rome, Italy
| | - Rosanna Inturri
- Dipartimento di Scienze Biomediche e Biotecnologiche, Sezione di Microbiologia, Università degli Studi di Catania, Catania, Italy
| | - Gianna Tempera
- Dipartimento di Scienze Biomediche e Biotecnologiche, Sezione di Microbiologia, Università degli Studi di Catania, Catania, Italy
| | - Pio Maria Furneri
- Dipartimento di Scienze Biomediche e Biotecnologiche, Sezione di Microbiologia, Università degli Studi di Catania, Catania, Italy
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8
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Mortari A, Lorenzelli L. Recent sensing technologies for pathogen detection in milk: A review. Biosens Bioelectron 2014; 60:8-21. [DOI: 10.1016/j.bios.2014.03.063] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2013] [Revised: 03/07/2014] [Accepted: 03/26/2014] [Indexed: 01/30/2023]
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9
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Ganesan B, Weimer B, Pinzon J, Dao Kong N, Rompato G, Brothersen C, McMahon D. Probiotic bacteria survive in Cheddar cheese and modify populations of other lactic acid bacteria. J Appl Microbiol 2014; 116:1642-56. [DOI: 10.1111/jam.12482] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2013] [Revised: 01/06/2014] [Accepted: 02/12/2014] [Indexed: 11/25/2022]
Affiliation(s)
- B. Ganesan
- Dairy Technology and Innovation Laboratory; Western Dairy Center; Utah State University; Logan UT USA
- Department of Nutrition, Dietetics, and Food Sciences; Utah State University; Logan UT USA
| | - B.C. Weimer
- Department of Population Health and Reproduction; University of California; Davis CA USA
| | - J. Pinzon
- Department of Population Health and Reproduction; University of California; Davis CA USA
| | - N. Dao Kong
- Department of Population Health and Reproduction; University of California; Davis CA USA
| | - G. Rompato
- Center for Integrated BioSystems; Utah State University; Logan UT USA
| | - C. Brothersen
- Dairy Technology and Innovation Laboratory; Western Dairy Center; Utah State University; Logan UT USA
- Department of Nutrition, Dietetics, and Food Sciences; Utah State University; Logan UT USA
| | - D.J. McMahon
- Dairy Technology and Innovation Laboratory; Western Dairy Center; Utah State University; Logan UT USA
- Department of Nutrition, Dietetics, and Food Sciences; Utah State University; Logan UT USA
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10
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Sohier D, Pavan S, Riou A, Combrisson J, Postollec F. Evolution of microbiological analytical methods for dairy industry needs. Front Microbiol 2014; 5:16. [PMID: 24570675 PMCID: PMC3916730 DOI: 10.3389/fmicb.2014.00016] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2013] [Accepted: 01/10/2014] [Indexed: 11/13/2022] Open
Abstract
Traditionally, culture-based methods have been used to enumerate microbial populations in dairy products. Recent developments in molecular methods now enable faster and more sensitive analyses than classical microbiology procedures. These molecular tools allow a detailed characterization of cell physiological states and bacterial fitness and thus, offer new perspectives to integration of microbial physiology monitoring to improve industrial processes. This review summarizes the methods described to enumerate and characterize physiological states of technological microbiota in dairy products, and discusses the current deficiencies in relation to the industry’s needs. Recent studies show that Polymerase chain reaction-based methods can successfully be applied to quantify fermenting microbes and probiotics in dairy products. Flow cytometry and omics technologies also show interesting analytical potentialities. However, they still suffer from a lack of validation and standardization for quality control analyses, as reflected by the absence of performance studies and official international standards.
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Affiliation(s)
- Danièle Sohier
- Food Safety and Quality Unit, ADRIA Développement, Agri-Food Technical Institute, Quimper, France
| | - Sonia Pavan
- Food Safety and Quality Unit, ADRIA Développement, Agri-Food Technical Institute, Quimper, France
| | - Armelle Riou
- Food Safety and Quality Unit, ADRIA Développement, Agri-Food Technical Institute, Quimper, France
| | - Jérôme Combrisson
- Bretagne Biotechnologie Alimentaire dairy association member, Analytical Sciences, Danone Research, Palaiseau, France
| | - Florence Postollec
- Food Safety and Quality Unit, ADRIA Développement, Agri-Food Technical Institute, Quimper, France
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11
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Balashov SV, Mordechai E, Adelson ME, Sobel JD, Gygax SE. Multiplex quantitative polymerase chain reaction assay for the identification and quantitation of major vaginal lactobacilli. Diagn Microbiol Infect Dis 2014; 78:321-7. [PMID: 24445159 DOI: 10.1016/j.diagmicrobio.2013.08.004] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2013] [Revised: 08/08/2013] [Accepted: 08/23/2013] [Indexed: 10/25/2022]
Abstract
Lactobacilli play a key role in promoting vaginal health. Depletion of these bacteria is associated with bacterial vaginosis (BV), the most common vaginal disorder. Here we describe the development and laboratory validation of a novel single-tube multiplex TaqMan quantitative polymerase chain reaction (qPCR) assay for the identification and quantitative assessment of the four major vaginal Lactobacillus species: L. crispatus, L. jensenii, L. gasseri, and L. iners. The assay utility was evaluated by the analysis of lactobacilli in non-cultured clinical vaginal swab specimens collected from BV patients and healthy individuals. As confirmed by the assay, L. crispatus, L. jensenii, and to a lesser extent L. gasseri, are common in the vagina of healthy women, whereas L. iners dominance is associated with BV. The major assay limitation was preferential detection of dominant Lactobacillus species in samples with mixed lactobacilli resulting in lower sensitivity for minor species. The multiplex qPCR assay described here is an advance in the detection and quantitation of the major vaginal lactobacilli, potentially facilitating the molecular diagnosis of BV and post-therapy restoration of the vaginal microflora.
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Affiliation(s)
- Sergey V Balashov
- Femeris Women's Health Research Center, Medical Diagnostic Laboratories, L.L.C., A Member of Genesis Biotechnology Group, Hamilton, NJ.
| | - Eli Mordechai
- Femeris Women's Health Research Center, Medical Diagnostic Laboratories, L.L.C., A Member of Genesis Biotechnology Group, Hamilton, NJ
| | - Martin E Adelson
- Femeris Women's Health Research Center, Medical Diagnostic Laboratories, L.L.C., A Member of Genesis Biotechnology Group, Hamilton, NJ
| | - Jack D Sobel
- Division of Infectious Diseases, Harper University Hospital, Wayne State University School of Medicine, Detroit, MI
| | - Scott E Gygax
- Femeris Women's Health Research Center, Medical Diagnostic Laboratories, L.L.C., A Member of Genesis Biotechnology Group, Hamilton, NJ
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13
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Sekwati-Monang B, Valcheva R, Gänzle MG. Microbial ecology of sorghum sourdoughs: Effect of substrate supply and phenolic compounds on composition of fermentation microbiota. Int J Food Microbiol 2012; 159:240-6. [DOI: 10.1016/j.ijfoodmicro.2012.09.013] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2012] [Revised: 09/07/2012] [Accepted: 09/19/2012] [Indexed: 02/06/2023]
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14
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Angelakis E, Million M, Henry M, Raoult D. Rapid and accurate bacterial identification in probiotics and yoghurts by MALDI-TOF mass spectrometry. J Food Sci 2012; 76:M568-72. [PMID: 22417598 DOI: 10.1111/j.1750-3841.2011.02369.x] [Citation(s) in RCA: 85] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Probiotic food is manufactured by adding probiotic strains simultaneously with starter cultures in fermentation tanks. Here, we investigate the accuracy and feasibility of matrix-assisted laser desorption/ionisation time-of-flight mass spectrometry (MALDI-TOF MS) for bacterial identification at the species level in probiotic food and yoghurts. Probiotic food and yoghurts were cultured in Columbia and Lactobacillus specific agar and tested by quantitative real-time PCR (qPCR) for the detection and quantification of Lactobacillus sp. Bacterial identification was performed by MALDI-TOF analysis and by amplification and sequencing of tuf and 16S rDNA genes. We tested 13 probiotic food and yoghurts and we identified by qPCR that they presented 10(6) to 10(7) copies of Lactobacillus spp. DNA/g. All products contained very large numbers of living bacteria varying from 10(6) to 10(9) colony forming units/g. These bacteria were identified as Lactobacillus casei, Lactococcus lactis, Bifidobacterium animalis, Lactobacillus delbrueckii, and Streptococcus thermophilus. MALDI-TOF MS presented 92% specificity compared to the molecular assays. In one product we found L. lactis, instead of Bifidus spp. which was mentioned on the label and for another L. delbrueckii and S. thermophilus instead of Bifidus spp. MALDI-TOF MS allows a rapid and accurate bacterial identification at the species level in probiotic food and yoghurts. Although the safety and functionality of probiotics are species and strain dependent, we found a discrepancy between the bacterial strain announced on the label and the strain identified. Practical Application: MALDI-TOF MS is rapid and specific for the identification of bacteria in probiotic food and yoghurts. Although the safety and functionality of probiotics are species and strain dependent, we found a discrepancy between the bacterial strain announced on the label and the strain identified.
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Affiliation(s)
- Emmanouil Angelakis
- CNRS UMR 6020, IFR 48, Faculté de Médecine, Univ. de la Méditerranée, 27 Bd Jean Moulin, 13385 Marseille Cedex 05, France
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15
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Gouriet F, Million M, Henri M, Fournier PE, Raoult D. Lactobacillus rhamnosus bacteremia: an emerging clinical entity. Eur J Clin Microbiol Infect Dis 2012; 31:2469-80. [PMID: 22544343 DOI: 10.1007/s10096-012-1599-5] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2011] [Accepted: 02/29/2012] [Indexed: 02/06/2023]
Abstract
Lactobacillus spp. are ubiquitous commensals of the normal human flora that are only occasionally found in clinical infections. Their role in human disease is established for infectious endocarditis but is controversial for other infections. We sought to characterize clinically associated Lactobacillus spp. We conducted a retrospective study, which consisted of the screening of Lactobacillus isolates obtained in our laboratory from January 2004 to December 2009. The polymerase chain reaction (PCR) assay was selected as the gold standard method. The isolates were first identified using API Coryne strips, matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS), and 16S rRNA gene sequencing. Lactobacillus tuf gene-based identification was used when the 16S rRNA results were inconclusive. Among the 60 strains of Lactobacillus spp. obtained in our laboratory, L. rhamnosus was the most commonly isolated species and was found in blood cultures from 16 patients. Combined with 45 patients reported in the literature, we found that patients presenting with L. rhamnosus bacteremia experienced nosocomial infections associated with both immunosuppression (66 %) and catheters (83 %).
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Affiliation(s)
- F Gouriet
- Unité des Rickettsies, CNRS UMR 6236, IRD 198, Faculté de Médecine, Université de la Méditerranée, 27 Bd. Jean Moulin, 13385, Marseille Cedex 05, France
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16
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Chiang YC, Lu HC, Li SC, Chang YH, Chen HY, Lin CW, Tsen HY. Development of PCR primers and a DNA macroarray for the simultaneous detection of major Staphylococcus species using groESL gene. Foodborne Pathog Dis 2012; 9:249-57. [PMID: 22300167 DOI: 10.1089/fpd.2011.1007] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Staphylococcus spp., including S. aureus, S. intermedius, S. hyicus, S. epidermidis, S. saprophyticus, S. haemolyticus, S. xylosus, and S. carnosus, are major bacterial species associated with food poisoning, and human and veterinary clinics. Traditional methods for the identification of these staphylococci are time-consuming, laborious, or inaccurate. Therefore, rapid and accurate diagnostic methods are needed. In this study, we designed the DNA probes and polymerase chain reaction (PCR) primers for the detection of the aforementioned Staphylococcus species. These primers were proved to be specific for the detection of their corresponding target strains. Furthermore, by using a consensus primer pair, we were able to co-amplify the intergenic region of groES-groEL for these staphylococci. Followed by a chromogenic macroarray system with the specific probes on the plastic chips, these staphylococci in milk products or clinical samples could be simultaneously detected. When the system was used for the inspection of milk or urine samples containing N × 10⁰ target cells per milliliter of the sample, all these staphylococcal species could be identified after an 8-h pre-enrichment step. This system also allowed the adequate diagnosis of bacteremia, since N × 10⁰ target cells per milliliter of the blood samples could be detected after a 12-h pre-enrichment. Compared to the multiplex PCR method, this approach has the additional advantage that it allowed the discrimination of more bacterial strains-even some bacterial strains that may generate PCR products with the same molecular sizes.
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Affiliation(s)
- Yu-Cheng Chiang
- Department of Food Science and Technology, Hung Kuang University, Shalu, Taichung, Taiwan, ROC.
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17
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Sheu SJ, Hwang WZ, Chiang YC, Lin WH, Chen HC, Tsen HY. Use of tuf gene-based primers for the PCR detection of probiotic Bifidobacterium species and enumeration of bifidobacteria in fermented milk by cultural and quantitative real-time PCR methods. J Food Sci 2011; 75:M521-7. [PMID: 21535508 DOI: 10.1111/j.1750-3841.2010.01816.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Due to the increasing use of bifidobacteria in probiotic products, it is essential to establish a rapid method for the qualitative and quantitative assay of the bifidobacteria in commercial products. In this study, partial sequences of the tuf gene for 18 Bifidobacterium strains belonging to 14 species were determined. Alignment of these sequences showed that the similarities among these Bifidobacterium species were 82.24% to 99.72%. Based on these tuf gene sequences, 6 primer sets were designed for the polymerase chain reaction (PCR) assay of B. animalis subsp. animalis, B. animalis subsp. lactis, B. bifidum, B. breve, B. longum subsp. infantis, B. longum subsp. longum, and the genus of Bifidobacterium, respectively. These Bifidobacterium species are common probiotic species present in dairy and probiotic products. When each target Bifidobacterium spp. was assayed with the designed primers, PCR product with expected size was generated. In addition, for each target species, more than 70 bacterial strains other than the target species, including strains of other Bifidobacterium species, strains of Lactobacillus spp., Enterococcus spp., and other bacterial species, all generated negative results. PCR assay with primers specific to B. animalis subsp. lactis and B. longum subsp. longum confirmed the presence of these Bifidobacterium species in commercial yogurt products. In addition, for each product, enumeration of the bifidobacteria cells by culture method with BIM-25 agar and the quantitative real-time PCR showed similar cell counts. Such results indicated that within 15-d storage (4 °C) after manufacture, all the bifidobacteria cells originally present in yogurt products were viable and culturable during the storage.
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Affiliation(s)
- Sen-Je Sheu
- Dept. of Food Science and Biotechnology, Natl. Chung Hsing Univ., No. 250, Kuo Kuang Rd. Taichung City, Taiwan 402, Republic of China
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Cremonesi P, Vanoni L, Morandi S, Silvetti T, Castiglioni B, Brasca M. Development of a pentaplex PCR assay for the simultaneous detection of Streptococcus thermophilus, Lactobacillus delbrueckii subsp. bulgaricus, L. delbrueckii subsp. lactis, L. helveticus, L. fermentum in whey starter for Grana Padano cheese. Int J Food Microbiol 2011; 146:207-11. [PMID: 21377750 DOI: 10.1016/j.ijfoodmicro.2011.02.016] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2010] [Revised: 01/17/2011] [Accepted: 02/16/2011] [Indexed: 11/29/2022]
Abstract
A pentaplex PCR assay for the rapid, selective and simultaneous detection of Lactobacillus helveticus, L. delbrueckii subsp. lactis, L. delbrueckii subsp. bulgaricus, Streptococcus thermophilus, and L. fermentum, was developed. The target sequences were a group of genes coding for beta-galactosidase production (S. thermophilus and L. delbrueckii subsp. bulgaricus), for cell-enveloped associated proteinase synthesis (L. helveticus), for dipeptide transport system production (L. delbrueckii subsp. lactis) and for arginine-ornithine antiporter protein production (L. fermentum). The analytical specificity of the assay was evaluated with 5 reference strains and 140 lactic acid bacterial strains derived from raw milk cheeses and belonging to the Lactobacillus, Streptococcus, Lactococcus and Enterococcus genera. The identification limit for each target strain was 10(3)CFU/ml. This new molecular assay was used to investigate the LAB population by direct extraction of DNA from the 12 whey cultures for Grana Padano. The pentaplex PCR assay revealed a good correspondence with microbiological analyses and allowed to identify even minor LAB community members which, can be out-competed in vitro by numerically more abundant microbial species.
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Affiliation(s)
- Paola Cremonesi
- Institute of Agricultural Biology and Biotechnology, Italian National Research Council, Via Bassini 15, Milan, Italy.
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Nikolaou A, Saxami G, Kourkoutas Y, Galanis A. A new methodology for rapid detection of Lactobacillus delbrueckii subsp. bulgaricus based on multiplex PCR. J Microbiol Methods 2010; 84:362-4. [PMID: 21182878 DOI: 10.1016/j.mimet.2010.12.010] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2010] [Revised: 11/23/2010] [Accepted: 12/14/2010] [Indexed: 10/18/2022]
Abstract
In this study we present a novel multiplex PCR assay for rapid and efficient detection of Lactobacillus delbrueckii subsp. bulgaricus. The accuracy of our method was confirmed by the successful identification of L. delbrueckii subsp. bulgaricus in commercial yoghurts and food supplements and it may be readily applied to the food industry.
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Affiliation(s)
- Anastasios Nikolaou
- Applied Microbiology and Molecular Biotechnology Research Group, Department of Molecular Biology and Genetics, Democritus University of Thrace, Alexandroupolis, Greece
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Calles-Enríquez M, Ladero V, Fernández M, Martín MC, Alvarez MA. Extraction of RNA from fermented milk products for in situ gene expression analysis. Anal Biochem 2010; 400:307-9. [DOI: 10.1016/j.ab.2010.02.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2010] [Revised: 02/10/2010] [Accepted: 02/10/2010] [Indexed: 10/19/2022]
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MILLS SUSAN, O’SULLIVAN ORLA, HILL COLIN, FITZGERALD GERALD, ROSS RPAUL. The changing face of dairy starter culture research: From genomics to economics. INT J DAIRY TECHNOL 2010. [DOI: 10.1111/j.1471-0307.2010.00563.x] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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