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Werum V, Ehrmann M. Dellaglioa spp. an underestimated genus isolated from high-oxygen modified-atmosphere packaged meat. Food Microbiol 2024; 117:104398. [PMID: 37919006 DOI: 10.1016/j.fm.2023.104398] [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: 05/16/2023] [Revised: 09/27/2023] [Accepted: 10/03/2023] [Indexed: 11/04/2023]
Abstract
The genus Dellaglioa (D.) actually comprises two species, i.e., D. algida and the recently described species D. carnosa. Both species are adapted to cold and have been typically recovered from meat products. However, their importance has thus far been underestimated, since routine culture-based analysis failed to support their growth. Furthermore, their occurrence on meat packed under high-oxygen MA conditions (HiOx-MAP) is controversial because they have been described as being oxygen-sensitive. In this study, we focused on the targeted isolation of Dellaglioa spp. from HiOx-MAP meat samples and the characterization of our isolates regarding their adaption to HiOx-MAP conditions, their spoilage potential, as well as food safety aspects. We used a medium recently developed specifically for strains of this genus and investigated ten meat batches from seven different suppliers. Our study confirms that the occurrence of Dellaglioa spp. on HiOx-MAP meat is non-sporadic, reaching cell counts ranging from log10 5.8-7.1 CFU/cm2 at a late stage of chilled storage. Autochthonous Dellaglioa spp. and Leuconostoc (L.) gasicomitatum dominated the microbiota of the beef steaks with similar growth behavior. Our results suggest that Dellaglioa spp. benefits from the heme-dependent respiration of oxygen by L. gasicomitatum. Furthermore, whole genome analysis revealed the presence of genes predictively involved in oxidative stress defense, survival, and adaptation in meat environments. Moreover, we predict a weak aminogenic potential of D. algida strains. Tyramine production from tyrosine seems to be a species-specific characteristic of D. carnosa. The extent to which D. algida and D. carnosa occurrence is influenced by or even dependent on the composition of the entire microbiota remains to be investigated.
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Affiliation(s)
- Victoria Werum
- Lehrstuhl für Mikrobiologie, Technische Universität München, Gregor-Mendel-Straße 4, 85354, Freising, Germany
| | - Matthias Ehrmann
- Lehrstuhl für Mikrobiologie, Technische Universität München, Gregor-Mendel-Straße 4, 85354, Freising, Germany.
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Fusco V, Chieffi D, Fanelli F, Montemurro M, Rizzello CG, Franz CMAP. The Weissella and Periweissella genera: up-to-date taxonomy, ecology, safety, biotechnological, and probiotic potential. Front Microbiol 2023; 14:1289937. [PMID: 38169702 PMCID: PMC10758620 DOI: 10.3389/fmicb.2023.1289937] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Accepted: 11/14/2023] [Indexed: 01/05/2024] Open
Abstract
Bacteria belonging to the genera Weissella and Periweissella are lactic acid bacteria, which emerged in the last decades for their probiotic and biotechnological potential. In 2015, an article reviewing the scientific literature till that date on the taxonomy, ecology, and biotechnological potential of the Weissella genus was published. Since then, the number of studies on this genus has increased enormously, several novel species have been discovered, the taxonomy of the genus underwent changes and new insights into the safety, and biotechnological and probiotic potential of weissellas and periweissellas could be gained. Here, we provide an updated overview (from 2015 until today) of the taxonomy, ecology, safety, biotechnological, and probiotic potential of these lactic acid bacteria.
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Affiliation(s)
- Vincenzina Fusco
- National Research Council, Institute of Sciences of Food Production (CNR-ISPA), Bari, Italy
| | - Daniele Chieffi
- National Research Council, Institute of Sciences of Food Production (CNR-ISPA), Bari, Italy
| | - Francesca Fanelli
- National Research Council, Institute of Sciences of Food Production (CNR-ISPA), Bari, Italy
| | - Marco Montemurro
- National Research Council, Institute of Sciences of Food Production (CNR-ISPA), Bari, Italy
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Dourou D, Doulgeraki AI, Vitsou-Anastasiou S, Argyri AA, Chorianopoulos NG, Nychas GJE, Tassou CC. Deciphering the growth responses and genotypic diversity of bioluminescent Photobacterium phosphoreum on chicken meat during aerobic refrigerated storage. Int J Food Microbiol 2023; 405:110334. [PMID: 37517119 DOI: 10.1016/j.ijfoodmicro.2023.110334] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Revised: 06/29/2023] [Accepted: 07/20/2023] [Indexed: 08/01/2023]
Abstract
The advent of high-throughput sequencing technologies in recent years has revealed the unexpected presence of genus Photobacterium within the chicken meat spoilage ecosystem. This study was undertaken to decipher the occurrence, the growth patterns and the genotypic biodiversity of Photobacterium phosphoreum on chicken breast fillets stored aerobically at 4 °C through conventional microbiological methods and molecular techniques. Samples were periodically cultured on marine broth agar (MA; supplemented with meat extract and vancomycin) for the enumeration of presumptive bioluminescent Photobacterium spp. In total, 90 bioluminescent bacteria were recovered from the initial (time of first appearance), middle and end stages of storage. Concomitantly, 95 total psychrotrophic/psychrophilic bacteria were isolated from the same medium to assess the presence and diversity of non-luminous photobacteria. Genetic diversity between bioluminescent isolates was assessed with two PCR-based DNA fingerprinting methods, i.e. RAPD and rep-PCR. Moreover, the characterization of selected bacterial isolates at the genus and/or species level was performed by sequencing of the 16S rRNA and/or gyrB gene. Bioluminescent bacteria were scarcely encountered in fresh samples at population levels of ca. 2.0 log CFU/g, whilst total psychrotrophic/psychrophilic bacteria were found at levels of ca. 4.4 log CFU/g. As time proceeded and close to shelf-life end, bioluminescent bacteria were encountered at higher populations, and were found at levels of 5.3 and 7.0 log CFU/g in samples from the second and third batch, respectively. In the first batch their presence was occasional and at levels up to 3.9 log CFU/g. Accordingly, total psychrotrophic/psychrophilic bacteria exceeded 8.4 log CFU/g at the end of storage, suggesting the possible underestimation of bioluminescent populations following the specific cultivation conditions. Sequence analysis assigned bioluminescent isolates to Photobacterium phosphoreum, while genetic fingerprinting revealed high intra-species variability. Respectively, total psychrotrophs/psychrophiles were assigned to genera Pseudomonas, Shewanella, Psychrobacter, Acinetobacter, Vibrio and Photobacterium. Non-luminous photobacteria were not identified within the psychrotrophs/psychrophiles. Results of the present study reveal the intra- and inter-batch variability on the occurrence and growth responses of P. phosphoreum and highlight its potential role in the chicken meat spoilage consortium.
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Affiliation(s)
- Dimitra Dourou
- Hellenic Agricultural Organization - DIMITRA, Institute of Technology of Agricultural Products, Sofokli Venizelou 1, 14123 Lycovrissi, Attica, Greece
| | - Agapi I Doulgeraki
- Hellenic Agricultural Organization - DIMITRA, Institute of Technology of Agricultural Products, Sofokli Venizelou 1, 14123 Lycovrissi, Attica, Greece.
| | - Stamatia Vitsou-Anastasiou
- Hellenic Agricultural Organization - DIMITRA, Institute of Technology of Agricultural Products, Sofokli Venizelou 1, 14123 Lycovrissi, Attica, Greece; Agricultural University of Athens, Department of Food Science and Human Nutrition, Laboratory of Food Microbiology and Biotechnology, Iera Odos 75, 11855 Athens, Greece
| | - Anthoula A Argyri
- Hellenic Agricultural Organization - DIMITRA, Institute of Technology of Agricultural Products, Sofokli Venizelou 1, 14123 Lycovrissi, Attica, Greece
| | - Nikos G Chorianopoulos
- Hellenic Agricultural Organization - DIMITRA, Institute of Technology of Agricultural Products, Sofokli Venizelou 1, 14123 Lycovrissi, Attica, Greece; Agricultural University of Athens, Department of Food Science and Human Nutrition, Laboratory of Food Microbiology and Biotechnology, Iera Odos 75, 11855 Athens, Greece
| | - George-John E Nychas
- Agricultural University of Athens, Department of Food Science and Human Nutrition, Laboratory of Food Microbiology and Biotechnology, Iera Odos 75, 11855 Athens, Greece
| | - Chrysoula C Tassou
- Hellenic Agricultural Organization - DIMITRA, Institute of Technology of Agricultural Products, Sofokli Venizelou 1, 14123 Lycovrissi, Attica, Greece.
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Pasquali F, Valero A, Possas A, Lucchi A, Crippa C, Gambi L, Manfreda G, De Cesare A. Variability in Physicochemical Parameters and Its Impact on Microbiological Quality and Occurrence of Foodborne Pathogens in Artisanal Italian Organic Salami. Foods 2023; 12:4086. [PMID: 38002143 PMCID: PMC10670534 DOI: 10.3390/foods12224086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2023] [Revised: 10/29/2023] [Accepted: 11/06/2023] [Indexed: 11/26/2023] Open
Abstract
Artisanal salami is produced in small-scale production plants, where the lack of full automation might result in higher variability in food intrinsic properties. The aim of the present study was to evaluate the inter- and intra-batch variability in physicochemical parameters and its impact on microbial quality and occurrence of foodborne pathogens on 480 samples collected from six batches of an artisanal Italian production of organic salami. Relatively high total bacterial counts (TBC) were found on the surface of the table in the stuffing room (4.29 ± 0.40 log cfu/cm2). High loads of Enterobacteriaceae in the meat mixture of batch 2 and TBC in batch 5 were associated with a higher occurrence of bacterial pathogens. During ripening, water activity (aw) and pH failed to reach values lower than 0.86 and 5.3, respectively. Six Staphylococcus aureus and four Listeria monocytogenes isolates were collected from the salami meat mixture during ripening and the processing environment. A total of 126 isolates of Enterobacteriaceae were characterized at a species level, with Escherichia coli, Klebsiella pneumoniae, Enterobacter cloacae, and Citrobacter freundii isolated from the final products. Results suggest the relevance of first steps of production in terms of the hygiene of raw materials and handling during stuffing procedures, especially when the physicochemical parameters of the final products do not reach values that represent hurdles for foodborne pathogens.
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Affiliation(s)
- Frédérique Pasquali
- Department of Agricultural and Food Sciences, Alma Mater Studiorum—University of Bologna, 40126 Bologna, Italy; (F.P.); (A.L.); (C.C.); (L.G.); (G.M.)
| | - Antonio Valero
- Department of Food Science and Technology, University of Cordoba, Agrifood Campus of International Excellence ceiA3, Campus Rabanales, 14014 Córdoba, Spain;
| | - Arícia Possas
- Department of Food Science and Technology, University of Cordoba, Agrifood Campus of International Excellence ceiA3, Campus Rabanales, 14014 Córdoba, Spain;
| | - Alex Lucchi
- Department of Agricultural and Food Sciences, Alma Mater Studiorum—University of Bologna, 40126 Bologna, Italy; (F.P.); (A.L.); (C.C.); (L.G.); (G.M.)
| | - Cecilia Crippa
- Department of Agricultural and Food Sciences, Alma Mater Studiorum—University of Bologna, 40126 Bologna, Italy; (F.P.); (A.L.); (C.C.); (L.G.); (G.M.)
| | - Lucia Gambi
- Department of Agricultural and Food Sciences, Alma Mater Studiorum—University of Bologna, 40126 Bologna, Italy; (F.P.); (A.L.); (C.C.); (L.G.); (G.M.)
| | - Gerardo Manfreda
- Department of Agricultural and Food Sciences, Alma Mater Studiorum—University of Bologna, 40126 Bologna, Italy; (F.P.); (A.L.); (C.C.); (L.G.); (G.M.)
| | - Alessandra De Cesare
- Department of Veterinary Medical Sciences, Alma Mater Studiorum—University of Bologna, 40126 Bologna, Italy;
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