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Dehaut A, Krzewinski F, Grard T, Chollet M, Jacques P, Brisabois A, Duflos G. Monitoring the freshness of fish: development of a qPCR method applied to MAP chilled whiting. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2016; 96:2080-2089. [PMID: 26112317 DOI: 10.1002/jsfa.7322] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2015] [Revised: 06/23/2015] [Accepted: 06/23/2015] [Indexed: 06/04/2023]
Abstract
BACKGROUND Monitoring of early stages of freshness decay is a major issue for the fishery industry to guarantee the best quality for this highly perishable food matrix. Numerous techniques have been developed, but most of them have the disadvantage of being reliable only either in the last stages of fish freshness or for the analysis of whole fish. This study describes the development of a qPCR method targeting the torA gene harboured by fish spoilage microorganisms. torA encodes an enzyme that leads to the production of trimethylamine responsible for the characteristic spoiled-fish odour. RESULTS A degenerate primer pair was designed. It amplified torA gene of both Vibrio and Photobacterium with good efficiencies on 7-log DNA dilutions. The primer pair was used during a shelf-life monitoring study achieved on modified atmosphere packed, chilled, whiting (Merlangius merlangus) fillets. The qPCR approach allows the detection of an increase of torA copies throughout the storage of fillets in correlation with the evolution of both total volatile basic nitrogen (-0.86) and trimethylamine concentrations (-0.81), known as spoilage markers. CONCLUSION This study described a very promising, sensitive, reliable, time-effective, technique in the field of freshness characterisation of processed fish.
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Affiliation(s)
- Alexandre Dehaut
- ANSES, Laboratoire de Sécurité des Aliments - Département des Produits de la Pêche et de l'Aquaculture, Boulevard du Bassin Napoléon, 62200, Boulogne-sur-Mer, France
| | - Frédéric Krzewinski
- Université de Lille 1, Unité de Glycobiologie Structurale et Fonctionnelle - UGSF - Bâtiment C9, 59650, Villeneuve d'Ascq, France
| | - Thierry Grard
- Université du Littoral Côte d'Opale - ANSES, Équipe Biochimie des Produits Aquatiques, Boulevard du Bassin Napoléon, 62200, Boulogne-sur-mer, France
| | - Marlène Chollet
- Laboratoire Régional de Recherche en Agroalimentaire et Biotechnologie - Institut Charles Viollette, Equipe ProBioGEM, Université de Lille1, Sciences et Technologies, Polytech'Lille, Avenue Paul Langevin, 59655, Villeneuve d'Ascq, France
| | - Philippe Jacques
- Laboratoire Régional de Recherche en Agroalimentaire et Biotechnologie - Institut Charles Viollette, Equipe ProBioGEM, Université de Lille1, Sciences et Technologies, Polytech'Lille, Avenue Paul Langevin, 59655, Villeneuve d'Ascq, France
| | - Anne Brisabois
- ANSES, Laboratoire de Sécurité des Aliments - Département des Produits de la Pêche et de l'Aquaculture, Boulevard du Bassin Napoléon, 62200, Boulogne-sur-Mer, France
| | - Guillaume Duflos
- ANSES, Laboratoire de Sécurité des Aliments - Département des Produits de la Pêche et de l'Aquaculture, Boulevard du Bassin Napoléon, 62200, Boulogne-sur-Mer, France
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202
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Du S, Zhang Z, Xiao L, Lou Y, Pan Y, Zhao Y. Acidic Electrolyzed Water as a Novel Transmitting Medium for High Hydrostatic Pressure Reduction of Bacterial Loads on Shelled Fresh Shrimp. Front Microbiol 2016; 7:305. [PMID: 27014228 PMCID: PMC4783573 DOI: 10.3389/fmicb.2016.00305] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Accepted: 02/24/2016] [Indexed: 01/02/2023] Open
Abstract
Acidic electrolyzed water (AEW), a novel non-thermal sterilization technology, is widely used in the food industry. In this study, we firstly investigated the effect of AEW as a new pressure transmitting medium for high hydrostatic pressure (AEW-HHP) processing on microorganisms inactivation on shelled fresh shrimp. The optimal conditions of AEW-HHP for Vibrio parahaemolyticus inactivation on sterile shelled fresh shrimp were obtained using response surface methodology: NaCl concentration to electrolysis 1.5 g/L, treatment pressure 400 MPa, treatment time 10 min. Under the optimal conditions mentioned above, AEW dramatically enhanced the efficiency of HHP for inactivating V. parahaemolyticus and Listeria monocytogenes on artificially contaminated shelled fresh shrimp, and the log reductions were up to 6.08 and 5.71 log10 CFU/g respectively, while the common HHP could only inactivate the two pathogens up to 4.74 and 4.31 log10 CFU/g respectively. Meanwhile, scanning electron microscopy (SEM) showed the same phenomenon. For the naturally contaminated shelled fresh shrimp, AEW-HHP could also significantly reduce the micro flora when examined using plate count and PCR-DGGE. There were also no significant changes, histologically, in the muscle tissues of shrimps undergoing the AEW-HHP treatment. In summary, using AEW as a new transmitting medium for HHP processing is an innovative non thermal technology for improving the food safety of shrimp and other aquatic products.
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Affiliation(s)
- Suping Du
- College of Food Science and Technology, Shanghai Ocean UniversityShanghai, China
| | - Zhaohuan Zhang
- College of Food Science and Technology, Shanghai Ocean UniversityShanghai, China
| | - Lili Xiao
- College of Food Science and Technology, Shanghai Ocean UniversityShanghai, China
| | - Yang Lou
- College of Food Science and Technology, Shanghai Ocean UniversityShanghai, China
| | - Yingjie Pan
- College of Food Science and Technology, Shanghai Ocean UniversityShanghai, China
- Shanghai Engineering Research Center of Aquatic-Product Processing and PreservationShanghai, China
- Laboratory of Quality and Safety Risk Assessment for Aquatic Product on Storage and Preservation (Shanghai), Ministry of Agriculture ShanghaiShanghai, China
| | - Yong Zhao
- College of Food Science and Technology, Shanghai Ocean UniversityShanghai, China
- Shanghai Engineering Research Center of Aquatic-Product Processing and PreservationShanghai, China
- Laboratory of Quality and Safety Risk Assessment for Aquatic Product on Storage and Preservation (Shanghai), Ministry of Agriculture ShanghaiShanghai, China
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203
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Ferrocino I, Greppi A, La Storia A, Rantsiou K, Ercolini D, Cocolin L. Impact of Nisin-Activated Packaging on Microbiota of Beef Burgers during Storage. Appl Environ Microbiol 2016; 82:549-59. [PMID: 26546424 PMCID: PMC4711142 DOI: 10.1128/aem.03093-15] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2015] [Accepted: 11/02/2015] [Indexed: 12/22/2022] Open
Abstract
Beef burgers were stored at 4°C in a vacuum in nisin-activated antimicrobial packaging. Microbial ecology analyses were performed on samples collected between days 0 and 21 of storage to discover the population diversity. Two batches were analyzed using RNA-based denaturing gradient gel electrophoresis (DGGE) and pyrosequencing. The active packaging retarded the growth of the total viable bacteria and lactic acid bacteria. Culture-independent analysis by pyrosequencing of RNA extracted directly from meat showed that Photobacterium phosphoreum, Lactococcus piscium, Lactobacillus sakei, and Leuconostoc carnosum were the major operational taxonomic units (OTUs) shared between control and treated samples. Beta diversity analysis of the 16S rRNA sequence data and RNA-DGGE showed a clear separation between two batches based on the microbiota. Control samples from batch B showed a significant high abundance of some taxa sensitive to nisin, such as Kocuria rhizophila, Staphylococcus xylosus, Leuconostoc carnosum, and Carnobacterium divergens, compared to control samples from batch A. However, only from batch B was it possible to find a significant difference between controls and treated samples during storage due to the active packaging. Predicted metagenomes confirmed differences between the two batches and indicated that the use of nisin-based antimicrobial packaging can determine a reduction in the abundance of specific metabolic pathways related to spoilage. The present study aimed to assess the viable bacterial communities in beef burgers stored in nisin-based antimicrobial packaging, and it highlights the efficacy of this strategy to prolong beef burger shelf life.
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Affiliation(s)
- Ilario Ferrocino
- Department of Agricultural, Forest and Food Science, University of Turin, Grugliasco, Italy
| | - Anna Greppi
- Department of Agricultural, Forest and Food Science, University of Turin, Grugliasco, Italy
| | - Antonietta La Storia
- Department of Agricultural Sciences, Division of Microbiology, University of Naples Federico II, Portici, Italy
| | - Kalliopi Rantsiou
- Department of Agricultural, Forest and Food Science, University of Turin, Grugliasco, Italy
| | - Danilo Ercolini
- Department of Agricultural Sciences, Division of Microbiology, University of Naples Federico II, Portici, Italy
| | - Luca Cocolin
- Department of Agricultural, Forest and Food Science, University of Turin, Grugliasco, Italy
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204
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Guidone A, Zotta T, Matera A, Ricciardi A, De Filippis F, Ercolini D, Parente E. The microbiota of high-moisture mozzarella cheese produced with different acidification methods. Int J Food Microbiol 2016; 216:9-17. [DOI: 10.1016/j.ijfoodmicro.2015.09.002] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2015] [Revised: 07/20/2015] [Accepted: 09/04/2015] [Indexed: 12/17/2022]
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205
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Parente E, Cocolin L, De Filippis F, Zotta T, Ferrocino I, O'Sullivan O, Neviani E, De Angelis M, Cotter PD, Ercolini D. FoodMicrobionet: A database for the visualisation and exploration of food bacterial communities based on network analysis. Int J Food Microbiol 2015; 219:28-37. [PMID: 26704067 DOI: 10.1016/j.ijfoodmicro.2015.12.001] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2015] [Revised: 11/27/2015] [Accepted: 12/04/2015] [Indexed: 12/12/2022]
Abstract
Amplicon targeted high-throughput sequencing has become a popular tool for the culture-independent analysis of microbial communities. Although the data obtained with this approach are portable and the number of sequences available in public databases is increasing, no tool has been developed yet for the analysis and presentation of data obtained in different studies. This work describes an approach for the development of a database for the rapid exploration and analysis of data on food microbial communities. Data from seventeen studies investigating the structure of bacterial communities in dairy, meat, sourdough and fermented vegetable products, obtained by 16S rRNA gene targeted high-throughput sequencing, were collated and analysed using Gephi, a network analysis software. The resulting database, which we named FoodMicrobionet, was used to analyse nodes and network properties and to build an interactive web-based visualisation. The latter allows the visual exploration of the relationships between Operational Taxonomic Units (OTUs) and samples and the identification of core- and sample-specific bacterial communities. It also provides additional search tools and hyperlinks for the rapid selection of food groups and OTUs and for rapid access to external resources (NCBI taxonomy, digital versions of the original articles). Microbial interaction network analysis was carried out using CoNet on datasets extracted from FoodMicrobionet: the complexity of interaction networks was much lower than that found for other bacterial communities (human microbiome, soil and other environments). This may reflect both a bias in the dataset (which was dominated by fermented foods and starter cultures) and the lower complexity of food bacterial communities. Although some technical challenges exist, and are discussed here, the net result is a valuable tool for the exploration of food bacterial communities by the scientific community and food industry.
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Affiliation(s)
- Eugenio Parente
- Dipartimento di Scienze, Università degli Studi della Basilicata, Potenza, Italy.
| | - Luca Cocolin
- Department of Agricultural, Forest and Food Science, University of Torino, Grugliasco, Italy
| | - Francesca De Filippis
- Department of Agricultural Sciences, Division of Microbiology, University of Naples Federico II, Portici, Italy
| | - Teresa Zotta
- Istituto di Scienze dell'Alimentazione, CNR, Avellino, Italy
| | - Ilario Ferrocino
- Department of Agricultural, Forest and Food Science, University of Torino, Grugliasco, Italy
| | - Orla O'Sullivan
- Teagasc Food Research Centre, Moorepark, Fermoy, Ireland; APC Microbiome Institute, Cork, Ireland
| | - Erasmo Neviani
- Department of Food Science, Parma University, Parco Area delle Scienze 48, /A, Parma, Italy
| | - Maria De Angelis
- Department of Soil, Plant and Food Science, University of Bari Aldo Moro, Bari, Italy
| | - Paul D Cotter
- Teagasc Food Research Centre, Moorepark, Fermoy, Ireland; APC Microbiome Institute, Cork, Ireland
| | - Danilo Ercolini
- Department of Agricultural Sciences, Division of Microbiology, University of Naples Federico II, Portici, Italy
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206
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Lactic acid bacterium and yeast microbiotas of sixteen French traditional sourdoughs. Int J Food Microbiol 2015; 215:161-70. [DOI: 10.1016/j.ijfoodmicro.2015.09.015] [Citation(s) in RCA: 84] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2015] [Revised: 09/11/2015] [Accepted: 09/22/2015] [Indexed: 11/21/2022]
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207
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Nieminen TT, Dalgaard P, Björkroth J. Volatile organic compounds and Photobacterium phosphoreum associated with spoilage of modified-atmosphere-packaged raw pork. Int J Food Microbiol 2015; 218:86-95. [PMID: 26623935 DOI: 10.1016/j.ijfoodmicro.2015.11.003] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2015] [Revised: 10/13/2015] [Accepted: 11/10/2015] [Indexed: 01/24/2023]
Abstract
Accumulation of volatile organic compounds was monitored in association with sensory quality, bacterial concentrations and culture-independent microbial community analyses in raw pork loin and pork collar during storage under high-oxygen modified atmosphere at +4 °C. Of the 48 volatile compounds detected in the pork samples, the levels of acetoin, diacetyl and 3-methyl-1-butanol had the highest correlations with the sensory scores and bacterial concentrations. These compounds accumulated in all of the four monitored lots of non-sterile pork but not in the sterilized pork during chilled storage. According to the culture-dependent and culture-independent characterization of bacterial communities, Brochothrix thermosphacta, lactic acid bacteria (Carnobacterium, Lactobacillus, Lactococcus, Leuconostoc, Weissella) and Photobacterium spp. predominated in pork samples. Photobacterium spp., typically not associated with spoilage of meat, were detected also in 8 of the 11 retail packages of pork investigated subsequently. Eleven isolates from the pork samples were shown to belong to Photobacterium phosphoreum by phenotypic tests and sequencing of the 16S rRNA and gyrB gene fragments. Off-odors in pork samples with high proportion of Photobacterium spp. were associated with accumulation of acetoin, diacetyl and 3-methyl-1-butanol in meat, but these compounds did not explain all the off-odors reported in sensory analyses.
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Affiliation(s)
- Timo T Nieminen
- Department of Food Hygiene and Environmental Health, Faculty of Veterinary Medicine, University of Helsinki, P.O. Box 66, 00014, Finland.
| | - Paw Dalgaard
- National Food Institute (DTU Food), Technical University of Denmark, Søltofts Plads, Building 221, 2800 Kgs. Lyngby, Denmark
| | - Johanna Björkroth
- Department of Food Hygiene and Environmental Health, Faculty of Veterinary Medicine, University of Helsinki, P.O. Box 66, 00014, Finland
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208
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The predominance of Lactobacillus sanfranciscensis in French organic sourdoughs and its impact on related bread characteristics. Int J Food Microbiol 2015; 213:40-8. [DOI: 10.1016/j.ijfoodmicro.2015.05.010] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2014] [Revised: 05/13/2015] [Accepted: 05/22/2015] [Indexed: 11/24/2022]
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209
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Kergourlay G, Taminiau B, Daube G, Champomier Vergès MC. Metagenomic insights into the dynamics of microbial communities in food. Int J Food Microbiol 2015; 213:31-9. [DOI: 10.1016/j.ijfoodmicro.2015.09.010] [Citation(s) in RCA: 87] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2015] [Revised: 09/04/2015] [Accepted: 09/13/2015] [Indexed: 02/06/2023]
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210
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Jérôme M, Macé S, Dousset X, Pot B, Joffraud JJ. Genetic diversity analysis of isolates belonging to the Photobacterium phosphoreum species group collected from salmon products using AFLP fingerprinting. Int J Food Microbiol 2015; 217:101-9. [PMID: 26513249 DOI: 10.1016/j.ijfoodmicro.2015.10.018] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2015] [Revised: 09/24/2015] [Accepted: 10/17/2015] [Indexed: 11/16/2022]
Abstract
An accurate amplified fragment length polymorphism (AFLP) method, including three primer sets for the selective amplification step, was developed to display the phylogenetic position of Photobacterium isolates collected from salmon products. This method was efficient for discriminating the three species Photobacterium phosphoreum, Photobacterium iliopiscarium and Photobacterium kishitanii, until now indistinctly gathered in the P. phosphoreum species group known to be strongly responsible for seafood spoilage. The AFLP fingerprints enabled the isolates to be separated into two main clusters that, according to the type strains, were assigned to the two species P. phosphoreum and P. iliopiscarium. P. kishitanii was not found in the collection. The accuracy of the method was validated by using gyrB-gene sequencing and luxA-gene PCR amplification, which confirmed the species delineation. Most of the isolates of each species were clonally distinct and even those that were isolated from the same source showed some diversity. Moreover, this AFLP method may be an excellent tool for genotyping isolates in bacterial communities and for clarifying our knowledge of the role of the different members of the Photobacterium species group in seafood spoilage.
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Affiliation(s)
- Marc Jérôme
- Ifremer, Laboratoire Ecosystèmes Microbiens et Molécules Marines pour les Biotechnologies (EM(3)B), BP21105, 44311 Nantes, France
| | - Sabrina Macé
- University of Liège, Food Science Department, Fundamental and Applied Research for Animal and Health, Food Microbiology, Sart-Tilman B43b, B-4000 Liège, Belgium
| | - Xavier Dousset
- LUNAM Université, Oniris, UMR1014, Secalim, Nantes, France
| | - Bruno Pot
- Applied Maths NV, Keistraat 120, Sint-Martens-Latem, Belgium
| | - Jean-Jacques Joffraud
- Ifremer, Laboratoire Ecosystèmes Microbiens et Molécules Marines pour les Biotechnologies (EM(3)B), BP21105, 44311 Nantes, France.
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211
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Nieminen TT, Nummela M, Björkroth J. Packaging gas selects lactic acid bacterial communities on raw pork. J Appl Microbiol 2015; 119:1310-6. [PMID: 26152532 DOI: 10.1111/jam.12890] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2015] [Revised: 05/29/2015] [Accepted: 06/20/2015] [Indexed: 11/26/2022]
Abstract
AIMS To study the effect of different CO2-rich packaging atmospheres on the composition of lactic acid bacterial communities proliferating on raw pork. METHODS AND RESULTS Raw pork loin was inoculated with a mixture of 14 lactic acid bacteria (LAB) strains previously associated with meat and packaged with four gas atmospheres: (i) 100% CO2 (ii) 80% N2 20% CO2 (iii) 80% N2, 20% CO2, 0·4% CO and (iv) 80% O2, 20% CO2. The colony counts of LAB, pH and composition of packaging gas were monitored every other day during the storage of 14 days at +6°C. The compositions of lactic acid bacterial communities on pork were evaluated after 7 days of storage with culture-independent, terminal restriction fragment length polymorphism analysis of 16S rRNA gene fragments. After 14 days of storage, the compositions of lactic acid bacterial communities were evaluated using identification of plate-grown LAB isolates by numerical ribopattern analysis. The results showed that (i) high concentration of CO2 in packaging atmosphere favoured Lactobacillus sp. (ii) high concentration of O2 favoured Leuconostoc spp. (iii) atmosphere with 80% N2, 20% CO2 favoured Lactococcus sp. CONCLUSIONS The composition of modified packaging atmosphere is a major factor selecting lactic acid bacterial communities proliferating on raw meat. SIGNIFICANCE AND IMPACT OF THE STUDY The study provides an explanation for the compositions of lactic bacterial communities on modified atmosphere packaged raw meat observed in other studies. The results should be considered when attempting to manipulate LAB communities in raw meat, e.g. by protective cultures.
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Affiliation(s)
- T T Nieminen
- Department of Food Hygiene and Environmental Health, Faculty of Veterinary Medicine, University of Helsinki, Helsinki, Finland.,Ruralia institute, Faculty of Agriculture and Forestry, University of Helsinki, Seinäjoki, Finland
| | - M Nummela
- Department of Food Hygiene and Environmental Health, Faculty of Veterinary Medicine, University of Helsinki, Helsinki, Finland
| | - J Björkroth
- Department of Food Hygiene and Environmental Health, Faculty of Veterinary Medicine, University of Helsinki, Helsinki, Finland
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212
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Pothakos V, Aulia YA, Van der Linden I, Uyttendaele M, Devlieghere F. Exploring the strain-specific attachment of Leuconostoc gelidum subsp. gasicomitatum on food contact surfaces. Int J Food Microbiol 2015; 199:41-6. [PMID: 25625910 DOI: 10.1016/j.ijfoodmicro.2015.01.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2014] [Revised: 01/07/2015] [Accepted: 01/08/2015] [Indexed: 02/05/2023]
Abstract
The psychrotrophic lactic acid bacterium (LAB) Leuconostoc gelidum subsp. gasicomitatum has emerged as one of the most prevalent specific spoilage organisms (SSOs) of packaged, cold-stored food products in Northern Europe. The whole genome sequencing of the type strain L. gelidum subsp. gasicomitatum LMG 18811(T) revealed genes encoding for proteins related to adhesion. In the present study the attachment of six food and environmental isolates was monitored on stainless steel (SS) and glass surfaces incubated (7 °C for 5-9 days) in two food simulating substrates (i.e. sweet bell pepper juice and boiled eggs in brine). The selection encompassed unique genotypes, isolated from different food products or sampling sites as well as slime-forming biotypes. The evaluation of the attached cells was performed with the bead vortexing method and a viability staining assay coupled with epifluorescence microscopy. On SS surfaces the slime-formers showed the lowest attachment (3.3-4.5 logCFU/cm(2)), while strain L. gelidum subsp. gasicomitatum ab2, which was isolated from an acetic acid bath in a vegetable salad company, reached significantly higher populations of attached cells exceeding 7 logCFU/cm(2). Strain ab2 formed dense cell aggregations on SS after 9 days of incubation in sweet bell pepper juice. The attachment ability of L. gelidum subsp. gasicomitatum on surfaces documented in the present study extends our knowledge and understanding of the spoilage potential and intra-subspecies diversity of this microbe.
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Affiliation(s)
- Vasileios Pothakos
- LFMFP, Laboratory of Food Microbiology and Food Preservation, Department of Food Safety and Food Quality, Faculty of Bioscience Engineering, Ghent University, Member of Food2Know, Coupure Links 653, B-9000 Gent, Belgium.
| | - Yosi Ayu Aulia
- LFMFP, Laboratory of Food Microbiology and Food Preservation, Department of Food Safety and Food Quality, Faculty of Bioscience Engineering, Ghent University, Member of Food2Know, Coupure Links 653, B-9000 Gent, Belgium
| | - Inge Van der Linden
- LFMFP, Laboratory of Food Microbiology and Food Preservation, Department of Food Safety and Food Quality, Faculty of Bioscience Engineering, Ghent University, Member of Food2Know, Coupure Links 653, B-9000 Gent, Belgium
| | - Mieke Uyttendaele
- LFMFP, Laboratory of Food Microbiology and Food Preservation, Department of Food Safety and Food Quality, Faculty of Bioscience Engineering, Ghent University, Member of Food2Know, Coupure Links 653, B-9000 Gent, Belgium
| | - Frank Devlieghere
- LFMFP, Laboratory of Food Microbiology and Food Preservation, Department of Food Safety and Food Quality, Faculty of Bioscience Engineering, Ghent University, Member of Food2Know, Coupure Links 653, B-9000 Gent, Belgium
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213
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Production of buttery-odor compounds and transcriptome response in Leuconostoc gelidum subsp. gasicomitatum LMG18811T during growth on various carbon sources. Appl Environ Microbiol 2014; 81:1902-8. [PMID: 25548057 DOI: 10.1128/aem.03705-14] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
Leuconostoc gelidum subsp. gasicomitatum is a common spoilage bacterium in meat products packaged under oxygen-containing modified atmospheres. Buttery off-odors related to diacetyl/acetoin formation are frequently associated with the spoilage of these products. A whole-genome microarray study, together with gas chromatography (GC)-mass spectrometry (MS) analyses of the pathway end products, was performed to investigate the transcriptome response of L. gelidum subsp. gasicomitatum LMG18811(T) growing on semidefined media containing glucose, ribose, or inosine, which are essential carbon sources in meat. Generally, the gene expression patterns with ribose and inosine were quite similar, indicating that catabolism of ribose and nucleosides is closely linked. Diacetyl/acetoin concentrations as high as 110 or 470 μM were measured when growth was based on inosine or ribose, respectively. The gene expression results for pyruvate metabolism (upregulation of α-acetolactate synthase, downregulation of l-lactate dehydrogenase and pyruvate dehydrogenase) were as expected when diacetyl and acetoin were the end products. No diacetyl production (<7.5 μM) was detected with the glucose-containing medium, even though the cell counts of LMG18811(T) was 6 or 10 times higher than that on inosine or ribose, respectively. Although glucose was the most effective carbon source for the growth of L. gelidum subsp. gasicomitatum, utilization of inosine and ribose resulted in the production of the unwanted buttery-odor compounds. These results increase our understanding of which compounds are likely to enhance the formation of buttery odors during meat spoilage caused by L. gelidum subsp. gasicomitatum.
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