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Characterization of Probiotic Properties of Lacticaseibacillus paracasei L2 Isolated from a Traditional Fermented Food "Lben". Life (Basel) 2022; 13:life13010021. [PMID: 36675968 PMCID: PMC9863983 DOI: 10.3390/life13010021] [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: 11/08/2022] [Revised: 12/04/2022] [Accepted: 12/13/2022] [Indexed: 12/24/2022] Open
Abstract
Lben is a dairy fermented food that is largely consumed in Tunisia for its numerous health benefits that are related to the existence of probiotics. Lactic Acid Bacteria (LAB) are well known for their beneficial probiotic properties for humans, especially when administered in adequate amounts. The aim of this study was to isolate and investigate the probiotics properties of Lacticaseibacillus paracasei L2 from Lben. The isolated strain was identified by 16S r-RNA gene sequences and MALDI- TOF MS. To evaluate the probiotic potential of the isolated bacterium, in vitro tests were performed, including adhesion ability to HCT-116 cells, survival in acid and bile salt conditions, lysozyme resistance, biofilm formation, hemolytic activity, antioxidant activity, and antimicrobial activity. Our results revealed that the selected Lacticaseibacillus paracasei L2 strain expressed a high adherence to HCT-116 cells (45.03%), survived under acidic conditions (pH3), and showed a resistance to bile salts. The strain was considered as safe (α-hemolysis). L. paracasei L2 showed a high biofilm-formation ability (OD 570 > 1.7) after 24 h of incubation. It also demonstrated an important antioxidant activity in the range of 85.31% for the intact cells. However, an antimicrobial activity against pathogens, namely Staphylococcus aureus, was detected with an IZ that was above 19 mm. In conjunction with the results obtained and the technological properties of Lacticaseibacillus paracasei L2 (proteolytic property, autolytic activity, acidifying activity, and EPS production), this strain may be used as a probiotic for manufacturing fermented foods.
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Microbiological, morpho-textural, and volatile characterization of Portuguese Queijo de Nisa PDO cheese. Food Res Int 2022; 162:112011. [DOI: 10.1016/j.foodres.2022.112011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Revised: 09/26/2022] [Accepted: 09/28/2022] [Indexed: 11/17/2022]
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UmaMaheswari T, Anbukkarasi K, Hemalatha T, Singh R. GTG5 fingerprinting of native Streptococcus thermophilus strains and its authentication by principal component analysis – A road to value added commercial yoghurt starter cultures. Int Dairy J 2021. [DOI: 10.1016/j.idairyj.2021.105161] [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]
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Exploitation of sea fennel (Crithmum maritimum L.) for manufacturing of novel high-value fermented preserves. FOOD AND BIOPRODUCTS PROCESSING 2021. [DOI: 10.1016/j.fbp.2021.03.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Ait Chait Y, Gunenc A, Hosseinian F, Bendali F. Antipathogenic and probiotic potential of Lactobacillus brevis strains newly isolated from Algerian artisanal cheeses. Folia Microbiol (Praha) 2021; 66:429-440. [PMID: 33709378 DOI: 10.1007/s12223-021-00857-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2020] [Accepted: 02/09/2021] [Indexed: 11/28/2022]
Abstract
From 98 Lactobacillus strains, isolated from Algerian homemade cheeses, 14 (B1-B14) were selected based on their anti-Escherichia coli and anti-Staphylococcus aureus activities. These strains were also tested towards Listeria monocytogenes 161 and Salmonella Typhimurium LT2 and further investigated for their resistance to simulated gastrointestinal digestion, cell surface properties, ability to adhere to HT-29 cells, cholesterol lowering, antioxidant activity, and technological traits. Five isolates (B9, B13, B18, B19, and B38) were active against L. monocytogenes and Salmonella. From them, three isolates, identified as Lactobacillus brevis (B9, B13, and B38) by MALDI-TOF spectrometry and 16S rDNA sequencing, exhibited high tolerance to pancreatic juice, bile salts and acidic juices, high percentages of hydrophobicity (87, 92, and 81%, respectively), auto-aggregation (61, 68, and 72%, respectively), and adherence to HT-29 cells (79, 84, and 74%, respectively), which testify on their potential of colonization of the human intestine. On the other way, the strains B9 and B13 manifested the most relevant antioxidant activity and cholesterol-lowering ability, respectively. L. brevis strains showed low acidifying and good proteolytic activities with noticeable heat tolerance. The results gathered in this study highlighted the richness of Algerian artisanal cheeses on new lactobacilli strains with an excellent probiotic potential and demonstrated that L. brevis, largely used as nonstarter in cheese manufacture, could be exploited also as a probiotic for human use.
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Affiliation(s)
- Yasmina Ait Chait
- Laboratoire de Microbiologie Appliquée, Faculté Des Sciences de La Nature Et de La Vie, Université de Bejaia, 06000, Bejaia, Algeria.,Food Science and Nutrition, Chemistry Department, Carleton University, 1125 Colonel by Drive, Ontario, Ottawa, K1S 5B6, Canada
| | - Aynur Gunenc
- Food Science and Nutrition, Chemistry Department, Carleton University, 1125 Colonel by Drive, Ontario, Ottawa, K1S 5B6, Canada
| | - Farah Hosseinian
- Food Science and Nutrition, Chemistry Department, Carleton University, 1125 Colonel by Drive, Ontario, Ottawa, K1S 5B6, Canada.,Institute of Biochemistry of Carleton University, 209 Nesbitt Biology Building, 1125 Colonel by Drive, Ontario, Ottawa, K1S 5B6, Canada
| | - Farida Bendali
- Laboratoire de Microbiologie Appliquée, Faculté Des Sciences de La Nature Et de La Vie, Université de Bejaia, 06000, Bejaia, Algeria.
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Ruiz P, Celada L, Seseña S, Palop ML. Leuconostoc mesenteroides in the brewing process: A controversial role. Food Control 2018. [DOI: 10.1016/j.foodcont.2018.03.019] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Seixas FN, Rios EA, Martinez de Oliveira AL, Beloti V, Poveda JM. Selection of Leuconostoc strains isolated from artisanal Serrano Catarinense cheese for use as adjuncts in cheese manufacture. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2018; 98:3899-3906. [PMID: 29364508 DOI: 10.1002/jsfa.8907] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2017] [Revised: 01/17/2018] [Accepted: 01/17/2018] [Indexed: 06/07/2023]
Abstract
BACKGROUND Serrano Catarinense cheese is a raw bovine milk cheese produced in the region of Santa Catarina, Brazil. Twelve representative strains of Leuconostoc isolated from 20 samples of this artisanal cheese were selected and submitted for evaluation of the acidifying, proteolytic, autolytic, aminopeptidase and lipolytic activities, NaCl and acid resistance, production of dextran and biogenic amines and antimicrobial activity. The aim was to genetically and technologically characterize the Leuconostoc strains in order to use them in mixed starter cultures for cheese manufacture. RESULTS Leuconostoc mesenteroides subsp. mesenteroides was the species that accounted for the largest proportion of isolates of Leuconostoc genus. Two leuconostoc isolates stood out in the acidifying activity, with reduction in pH of 1.12 and 1.04 units. The isolates showed low proteolytic and autolytic activity. Most of the isolates were dextran producers, presented good resistance to the salt and pH conditions of the cheese and showed antimicrobial activity against cheese pathogen bacteria, and none of them produced biogenic amines. CONCLUSION These results allowed the selection of five strains (UEL 04, UEL 12, UEL 18, UEL 21 and UEL 28) as good candidates for use as adjunct cultures for cheese manufacture. © 2018 Society of Chemical Industry.
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Affiliation(s)
- Felipe Nael Seixas
- Departamento de Química Analítica y Tecnología de Alimentos, Instituto Regional de Investigación Científica Aplicada (IRICA)/Facultad de Ciencias y Tecnologías Químicas, University of Castilla-La Mancha, Ciudad Real, Spain
| | - Edson Antônio Rios
- Pós-graduação em Ciência Animal/Departamento de Medicina Veterinária Preventiva, Universidade Estadual de Londrina (UEL), Londrina, Paraná, Brazil
| | - André Luiz Martinez de Oliveira
- Pós-graduação em Biotecnologia/Departamento de Bioquímica e Biotecnologia, Universidade Estadual de Londrina (UEL), Londrina, Brazil
| | - Vanerli Beloti
- Pós-graduação em Ciência Animal/Departamento de Medicina Veterinária Preventiva, Universidade Estadual de Londrina (UEL), Londrina, Paraná, Brazil
| | - Justa Maria Poveda
- Departamento de Química Analítica y Tecnología de Alimentos, Instituto Regional de Investigación Científica Aplicada (IRICA)/Facultad de Ciencias y Tecnologías Químicas, University of Castilla-La Mancha, Ciudad Real, Spain
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Stachelska MA. Identification of Lactobacillus delbrueckii and Streptococcus thermophilus Strains Present in Artisanal Raw Cow Milk Cheese Using Real-time PCR and Classic Plate Count Methods. Pol J Microbiol 2017; 66:491-499. [DOI: 10.5604/01.3001.0010.7041] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The aim of this paper was to detect Lactobacillus delbrueckii and Streptococcus thermophilus using real-time quantitative PCR assay in 7-day ripening cheese produced from unpasteurised milk. Real-time quantitative PCR assays were designed to identify and enumerate the chosen species of lactic acid bacteria (LAB) in ripened cheese. The results of molecular quantification and classic bacterial enumeration showed a high level of similarity proving that DNA extraction was carried out in a proper way and that genomic DNA solutions were free of PCR inhibitors. These methods revealed the presence of L. delbrueckii and S. thermophilus. The real-time PCR enabled quantification with a detection of 101–103 CFU/g of product. qPCR-standard curves were linear over seven log units down to 101 copies per reaction; efficiencies ranged from 77.9% to 93.6%. Cheese samples were analysed with plate count method and qPCR in parallel. Compared with the classic plate count method, the newly developed qPCR method provided faster and species specific identification of two dairy LAB and yielded comparable quantitative results.
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Affiliation(s)
- Milena A. Stachelska
- Institute of Food Technology and Gastronomy, Lomza State University of Applied Sciences, Lomza, Poland
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Cardinali F, Osimani A, Taccari M, Milanović V, Garofalo C, Clementi F, Polverigiani S, Zitti S, Raffaelli N, Mozzon M, Foligni R, Franciosi E, Tuohy K, Aquilanti L. Impact of thistle rennet from Carlina acanthifolia All. subsp. acanthifolia on bacterial diversity and dynamics of a specialty Italian raw ewes' milk cheese. Int J Food Microbiol 2017; 255:7-16. [DOI: 10.1016/j.ijfoodmicro.2017.05.018] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2017] [Revised: 04/26/2017] [Accepted: 05/21/2017] [Indexed: 12/17/2022]
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Carafa I, Nardin T, Larcher R, Viola R, Tuohy K, Franciosi E. Identification and characterization of wild lactobacilli and pediococci from spontaneously fermented Mountain Cheese. Food Microbiol 2015; 48:123-32. [DOI: 10.1016/j.fm.2014.12.003] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2014] [Revised: 12/03/2014] [Accepted: 12/10/2014] [Indexed: 11/26/2022]
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De Pasquale I, Calasso M, Mancini L, Ercolini D, La Storia A, De Angelis M, Di Cagno R, Gobbetti M. Causal relationship between microbial ecology dynamics and proteolysis during manufacture and ripening of protected designation of origin (PDO) cheese Canestrato Pugliese. Appl Environ Microbiol 2014; 80:4085-94. [PMID: 24771032 PMCID: PMC4068669 DOI: 10.1128/aem.00757-14] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2014] [Accepted: 04/23/2014] [Indexed: 11/20/2022] Open
Abstract
Pyrosequencing of the 16S rRNA gene, community-level physiological profiles determined by the use of Biolog EcoPlates, and proteolysis analyses were used to characterize Canestrato Pugliese Protected Designation of Origin (PDO) cheese. The number of presumptive mesophilic lactococci in raw ewes' milk was higher than that of presumptive mesophilic lactobacilli. The numbers of these microbial groups increased during ripening, showing temporal and numerical differences. Urea-PAGE showed limited primary proteolysis, whereas the analysis of the pH 4.6-soluble fraction of the cheese revealed that secondary proteolysis increased mainly from 45 to 75 days of ripening. This agreed with the concentration of free amino acids. Raw ewes' milk was contaminated by several bacterial phyla: Proteobacteria (68%; mainly Pseudomonas), Firmicutes (30%; mainly Carnobacterium and Lactococcus), Bacteroidetes (0.05%), and Actinobacteria (0.02%). Almost the same microbial composition persisted in the curd after molding. From day 1 of ripening onwards, the phylum Firmicutes dominated. Lactococcus dominated throughout ripening, and most of the Lactobacillus species appeared only at 7 or 15 days. At 90 days, Lactococcus (87.2%), Lactobacillus (4.8%; mainly Lactobacillus plantarum and Lactobacillus sakei), and Leuconostoc (3.9%) dominated. The relative utilization of carbon sources by the bacterial community reflected the succession. This study identified strategic phases that characterized the manufacture and ripening of Canestrato Pugliese cheese and established a causal relationship between mesophilic lactobacilli and proteolysis.
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Affiliation(s)
- Ilaria De Pasquale
- Department of Soil, Plant and Food Sciences, University of Bari Aldo Moro, Bari, Italy
| | - Maria Calasso
- Department of Soil, Plant and Food Sciences, University of Bari Aldo Moro, Bari, Italy
| | - Leonardo Mancini
- Department of Soil, Plant and Food Sciences, University of Bari Aldo Moro, Bari, Italy
| | - Danilo Ercolini
- Department of Agricultural Sciences, Division of Microbiology, University of Naples Federico II, Portici, Italy
| | - Antonietta La Storia
- Department of Agricultural Sciences, Division of Microbiology, University of Naples Federico II, Portici, Italy
| | - Maria De Angelis
- Department of Soil, Plant and Food Sciences, University of Bari Aldo Moro, Bari, Italy
| | - Raffaella Di Cagno
- Department of Soil, Plant and Food Sciences, University of Bari Aldo Moro, Bari, Italy
| | - Marco Gobbetti
- Department of Soil, Plant and Food Sciences, University of Bari Aldo Moro, Bari, Italy
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Bonomo MG, Salzano G. Genotypic and technological diversity ofLeuconostoc mesenteroidesandLactobacillus paracaseisubsp.paracaseistrains for use as adjunct starter cultures in Pecorino di Filiano cheese. INT J DAIRY TECHNOL 2013. [DOI: 10.1111/1471-0307.12040] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Maria G Bonomo
- Dipartimento di Scienze; Università degli Studi della Basilicata; Viale dell'Ateneo Lucano 10; 85100; Potenza; Italy
| | - Giovanni Salzano
- Dipartimento di Scienze; Università degli Studi della Basilicata; Viale dell'Ateneo Lucano 10; 85100; Potenza; Italy
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Aquilanti L, Santarelli S, Babini V, Osimani A, Clementi F. Quality evaluation and discrimination of semi-hard and hard cheeses from the Marche region (Central Italy) using chemometric tools. Int Dairy J 2013. [DOI: 10.1016/j.idairyj.2012.11.001] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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MA CHUNLI, ZHANG LANWEI, MA DEXING, DU MING, HAN XUE, YI HUAXI, ZHANG LILI, FENG ZHEN, ZHANG YANHE, ZHANG YINGCHUN, SONG WEI. Technological characterisation of Lactobacilli
isolated from Chinese artisanal fermented milks. INT J DAIRY TECHNOL 2011. [DOI: 10.1111/j.1471-0307.2011.00743.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Cebeci A, Gürakan GC. Comparative typing of L. delbrueckii subsp. bulgaricus strains using multilocus sequence typing and RAPD–PCR. Eur Food Res Technol 2011. [DOI: 10.1007/s00217-011-1526-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Karahan A, Başyiğit Kılıç G, Kart A, Şanlıdere Aloğlu H, Öner Z, Aydemir S, Erkuş O, Harsa Ş. Genotypic identification of some lactic acid bacteria by amplified fragment length polymorphism analysis and investigation of their potential usage as starter culture combinations in Beyaz cheese manufacture. J Dairy Sci 2010; 93:1-11. [DOI: 10.3168/jds.2008-1801] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2008] [Accepted: 09/08/2009] [Indexed: 11/19/2022]
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Nieto-Arribas P, Seseña S, Poveda J, Palop L, Cabezas L. Genotypic and technological characterization ofLactococcus lactisisolates involved in processing of artisanal Manchego cheese. J Appl Microbiol 2009; 107:1505-17. [DOI: 10.1111/j.1365-2672.2009.04334.x] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Nieto-Arribas P, Seseña S, Poveda JM, Palop L, Cabezas L. Genotypic and technological characterization of Leuconostoc isolates to be used as adjunct starters in Manchego cheese manufacture. Food Microbiol 2009; 27:85-93. [PMID: 19913697 DOI: 10.1016/j.fm.2009.08.006] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2009] [Accepted: 08/28/2009] [Indexed: 11/25/2022]
Abstract
Twenty-seven Leuconostoc (Ln.) isolates from Manchego cheese were characterized by phenotypic and genotypic methods, and their technological abilities studied in order to test their potential use as dairy starter components. While phenotypic diversity was evaluated by studying the biochemical characteristics of technological interest (i.e. acidifying and aminopeptidase activities), genotypic diversity was evidenced by using Randomly Amplified Polymorphic DNA-Polymerase Chain Reaction (RAPD-PCR). Additional technological abilities such as lipolytic, proteolytic and autolytic activities, salt and pH tolerance and production of dextran, flavour compounds and biogenic amines, were investigated. The marked differences among strains reflected the existing biodiversity in naturally fermented products. After statistically evaluating their performance, strains C0W2, belonging to Ln. lactis, and C16W5 and N2W5, belonging to Ln. mesenteroides subsp. dextranicum, revealed the best properties to be used in mixed dairy starter cultures. This study evidences the fact that natural environments can be considered as a proper source of useful strains, for the dairy industry.
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Affiliation(s)
- Pedro Nieto-Arribas
- Departamento de Química Analítica y Tecnología de Alimentos, Facultad de Químicas, Universidad de Castilla-La Mancha, Avda. Camilo José Cela s/n, 13071 Ciudad Real, Spain
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Application of molecular approaches to study lactic acid bacteria in artisanal cheeses. J Microbiol Methods 2009; 78:1-9. [DOI: 10.1016/j.mimet.2009.04.001] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2009] [Revised: 04/03/2009] [Accepted: 04/06/2009] [Indexed: 11/17/2022]
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Albano H, van Reenen CA, Todorov SD, Cruz D, Fraga L, Hogg T, Dicks LMT, Teixeira P. Phenotypic and genetic heterogeneity of lactic acid bacteria isolated from "Alheira", a traditional fermented sausage produced in Portugal. Meat Sci 2009; 82:389-98. [PMID: 20416703 DOI: 10.1016/j.meatsci.2009.02.009] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2008] [Revised: 02/09/2009] [Accepted: 02/10/2009] [Indexed: 11/18/2022]
Abstract
The aim of this study was to evaluate the phenotypic and genetic heterogeneity of lactic acid bacteria (LAB) isolated from "Alheira", a fermented sausage produced in Portugal. LAB were identified to genus and species level by phenotypic characteristics, using genus or species-specific primers and sequencing of the gene encoding 16S rRNA. Two-hundred and eighty-three isolates were grouped into 14 species. Lactobacillus plantarum was isolated from all sausages and Enterococcusfaecalis from most of the samples. Low numbers of Lactobacillus paraplantarum, Lactobacillus brevis, Lactobacillus rhamnosus, Lactobacillus sakei, Lactobacillus zeae, Lactobacillus paracasei, Leuconostoc mesenteroides, Pediococcus pentosaceus, Pediococcus acidilactici, Weissella cibaria, Weissella viridescens and Enterococcus faecium were recorded. The genetic heterogeneity of L. plantarum and E. faecalis strains were determined by numerical analysis of DNA banding patterns obtained by RAPD-PCR. Strains of L. plantarum and E. faecalis were different from different producers. This study forms the basis from which starter cultures could be selected for production of "Alheira".
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Affiliation(s)
- Helena Albano
- CBQF, Escola Superior de Biotecnologia, Universidade Católica Portuguesa; Rua Dr. António Bernardino de Almeida, 4200-072 Porto, Portugal
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Aquilanti L, Silvestri G, Zannini E, Osimani A, Santarelli S, Clementi F. Phenotypic, genotypic and technological characterization of predominant lactic acid bacteria in Pecorino cheese from central Italy. J Appl Microbiol 2008; 103:948-60. [PMID: 17897198 DOI: 10.1111/j.1365-2672.2007.03513.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
AIMS Identification and biotyping of lactic acid bacteria (LAB) isolated from raw-milk Pecorino cheese manufactured in the Marche region (central Italy) for selection of suitable starter cultures or adjuncts. METHODS AND RESULTS Preliminary characterization with morphological and biochemical assays were undertaken for 112 Gram-positive and catalase-negative isolates. Unequivocal identification of the isolates was obtained through restriction analysis of the amplified 16S rRNA gene and sequencing of 360-380 bp amplicons. Fifty-nine isolates belonging to LAB species generally recognized as safe and potentially utilized as starters or flavour-producing adjuncts were preselected and tested for their acidifying, proteolitic and autolytic activities. Fifty-five of these isolates were also subject to RAPD (randomly amplified polymorphic DNA) fingerprinting and unweighted pair-group method with arithmetic averages (UPGMA) cluster analysis for the estimation of genotypic intra-species variation. As a result, in Pecorino cheese, a heterogeneous lactic acid bacteria population, which includes strains with metabolic characteristics of technological interest, was characterized. CONCLUSIONS The polyphasic approach proposed allows the bacterial ecology of Pecorino cheese to be investigated and allows to assess the potential role of autochthonous LAB strains for the dairy industry. SIGNIFICANCE AND IMPACT OF THE STUDY The great economic importance of Pecorino cheese encouraged a deeper knowledge of its microbiota, which is known to influence the peculiar sensory properties of this cheese, also in view of its exploitation.
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Affiliation(s)
- L Aquilanti
- Department of Food Science, Polytechnic University of Marche, Via Brecce Bianche (Monte Dago), Ancona, Italy
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