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Martini S, Sola L, Cattivelli A, Cristofolini M, Pizzamiglio V, Tagliazucchi D, Solieri L. Cultivable microbial diversity, peptide profiles, and bio-functional properties in Parmigiano Reggiano cheese. Front Microbiol 2024; 15:1342180. [PMID: 38567075 PMCID: PMC10985727 DOI: 10.3389/fmicb.2024.1342180] [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: 11/21/2023] [Accepted: 02/26/2024] [Indexed: 04/04/2024] Open
Abstract
Introduction Lactic acid bacteria (LAB) communities shape the sensorial and functional properties of artisanal hard-cooked and long-ripened cheeses made with raw bovine milk like Parmigiano Reggiano (PR) cheese. While patterns of microbial evolution have been well studied in PR cheese, there is a lack of information about how this microbial diversity affects the metabolic and functional properties of PR cheese. Methods To fill this information gap, we characterized the cultivable fraction of natural whey starter (NWS) and PR cheeses at different ripening times, both at the species and strain level, and investigated the possible correlation between microbial composition and the evolution of peptide profiles over cheese ripening. Results and discussion The results showed that NWS was a complex community of several biotypes belonging to a few species, namely, Streptococcus thermophilus, Lactobacillus helveticus, and Lactobacillus delbrueckii subsp. lactis. A new species-specific PCR assay was successful in discriminating the cheese-associated species Lacticaseibacillus casei, Lacticaseibacillus paracasei, Lacticaseibacillus rhamnosus, and Lacticaseibacillus zeae. Based on the resolved patterns of species and biotype distribution, Lcb. paracasei and Lcb. zeae were most frequently isolated after 24 and 30 months of ripening, while the number of biotypes was inversely related to the ripening time. Peptidomics analysis revealed more than 520 peptides in cheese samples. To the best of our knowledge, this is the most comprehensive survey of peptides in PR cheese. Most of them were from β-caseins, which represent the best substrate for LAB cell-envelope proteases. The abundance of peptides from β-casein 38-88 region continuously increased during ripening. Remarkably, this region contains precursors for the anti-hypertensive lactotripeptides VPP and IPP, as well as for β-casomorphins. We found that the ripening time strongly affects bioactive peptide profiles and that the occurrence of Lcb. zeae species is positively linked to the incidence of eight anti-hypertensive peptides. This result highlighted how the presence of specific LAB species is likely a pivotal factor in determining PR functional properties.
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Affiliation(s)
- Serena Martini
- Nutritional Biochemistry, Department of Life Sciences, University of Modena and Reggio Emilia, Reggio Emilia, Italy
| | - Laura Sola
- Microbial Biotechnologies and Fermentation Technologies, Department of Life Sciences, University of Modena and Reggio Emilia, Modena, Italy
| | - Alice Cattivelli
- Nutritional Biochemistry, Department of Life Sciences, University of Modena and Reggio Emilia, Reggio Emilia, Italy
| | - Marianna Cristofolini
- Lactic Acid Bacteria and Yeast Biotechnology, Department of Life Sciences, University of Modena and Reggio Emilia, Reggio Emilia, Italy
| | | | - Davide Tagliazucchi
- Nutritional Biochemistry, Department of Life Sciences, University of Modena and Reggio Emilia, Reggio Emilia, Italy
| | - Lisa Solieri
- Lactic Acid Bacteria and Yeast Biotechnology, Department of Life Sciences, University of Modena and Reggio Emilia, Reggio Emilia, Italy
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Chessa L, Paba A, Dupré I, Daga E, Fozzi MC, Comunian R. A Strategy for the Recovery of Raw Ewe's Milk Microbiodiversity to Develop Natural Starter Cultures for Traditional Foods. Microorganisms 2023; 11:microorganisms11040823. [PMID: 37110245 PMCID: PMC10142512 DOI: 10.3390/microorganisms11040823] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Revised: 03/14/2023] [Accepted: 03/21/2023] [Indexed: 04/29/2023] Open
Abstract
Commercial starter cultures, composed of high concentrations of a few species/strains of lactic acid bacteria (LAB), selected based on their strong technological aptitudes, have been developed to easily and safely carry out food fermentations. Frequently applied to industrial productions, selected starter LAB easily become the dominant microbiota of products, causing a dramatic decrease in biodiversity. On the contrary, natural starter cultures, which usually characterize the most typical and Protected Designation of Origin (PDO) food products, are constituted by a multitude and an indefinite number of LAB species and strains, both starter and nonstarter, thus contributing to preserving microbial biodiversity. However, their use is not risk-free since, if obtained without heat treatment application, natural cultures can contain, together with useful, also spoilage microorganisms or pathogens that could be allowed to multiply during fermentation. In the present study, an innovative method for the production of a natural starter culture directly from raw ewe's milk, inhibiting the growth of spoilage and potentially pathogenic bacteria without applying any heat treatment, was described. The culture developed show a good degree of microbial biodiversity and could be applied to both artisanal and industrial scales, guaranteeing safety, quality constancy, technological performance reproducibility, preserving biodiversity and peculiar sensory characteristics, usually linked to traditional products, while overcoming the problems associated with the daily propagation of natural cultures.
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Affiliation(s)
- Luigi Chessa
- Agris Sardegna, Servizio per la Ricerca nelle Produzioni Animali, Associated Member of the JRU MIRRI-IT, Loc. Bonassai SS 291 km 18.600, 07100 Sassari, Italy
| | - Antonio Paba
- Agris Sardegna, Servizio per la Ricerca nelle Produzioni Animali, Associated Member of the JRU MIRRI-IT, Loc. Bonassai SS 291 km 18.600, 07100 Sassari, Italy
| | - Ilaria Dupré
- Agris Sardegna, Servizio per la Ricerca nelle Produzioni Animali, Associated Member of the JRU MIRRI-IT, Loc. Bonassai SS 291 km 18.600, 07100 Sassari, Italy
| | - Elisabetta Daga
- Agris Sardegna, Servizio per la Ricerca nelle Produzioni Animali, Associated Member of the JRU MIRRI-IT, Loc. Bonassai SS 291 km 18.600, 07100 Sassari, Italy
| | - Maria Carmen Fozzi
- Agris Sardegna, Servizio per la Ricerca nelle Produzioni Animali, Associated Member of the JRU MIRRI-IT, Loc. Bonassai SS 291 km 18.600, 07100 Sassari, Italy
| | - Roberta Comunian
- Agris Sardegna, Servizio per la Ricerca nelle Produzioni Animali, Associated Member of the JRU MIRRI-IT, Loc. Bonassai SS 291 km 18.600, 07100 Sassari, Italy
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Morandi S, Cremonesi P, Arioli S, Stocco G, Silvetti T, Biscarini F, Castiglioni B, Greco Ç, D'Ascanio V, Mora D, Brasca M. Effect of using mycotoxin-detoxifying agents in dairy cattle feed on natural whey starter biodiversity. J Dairy Sci 2022; 105:6513-6526. [PMID: 35840409 DOI: 10.3168/jds.2022-21793] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2022] [Accepted: 04/15/2022] [Indexed: 11/19/2022]
Abstract
Natural whey cultures (NWC) are undefined multiple-strain bacterial starter communities that can be affected by even small changes along the entire dairy chain. We applied a multidisciplinary approach to investigate how the addition of 2 mycotoxin-detoxifying agents [sodium smectite and lignocellulose-based material (B1); leonardite and betaine (B2)] to cow diets modified the microbiota of the NWC in manufacture of a Grana-like cheese. Microbiological and flow cytometry analyses showed that the content and viability of lactic acid bacteria (LAB) and the total whey microbiota were not affected by the detoxifying agents, and Streptococcus thermophilus, Lactobacillus helveticus, and Limosilactobacillus fermentum were the dominant taxa. Random amplified polymorphic DNA-PCR fingerprinting and metagenomic analysis highlighted differences in the bacterial community of the NWC and in the relative abundance of Bacteroidetes that increased when B1 and B2 were included in the diet. Two of 6 St. thermophilus biotypes were detected only in control samples; conversely, none of the Lb. helveticus biotypes found in control samples were isolated from B1 and B2. In vitro tests showed that the 2 binders did not significantly affect the development of St. thermophilus, but they stimulated the growth of Lb. helveticus strains recovered only from B1 and B2 NWC. The addition of binders in cow feed can affect the LAB biotypes present in NWC.
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Affiliation(s)
- S Morandi
- Institute of Sciences of Food Production (ISPA), Italian National Research Council (CNR), Via Celoria 2, 20133, Milan, Italy.
| | - P Cremonesi
- Institute of Agricultural Biology and Biotechnology (IBBA), Italian National Research Council (CNR), Via Einstein, 26900, Lodi, Italy
| | - S Arioli
- Department of Food, Environmental and Nutritional Sciences (DeFENS), University of Milan, Via Celoria 2, 20133, Milan, Italy
| | - G Stocco
- Department of Veterinary Science, University of Parma, Via del Taglio 10, I-43126 Parma, Italy
| | - T Silvetti
- Institute of Sciences of Food Production (ISPA), Italian National Research Council (CNR), Via Celoria 2, 20133, Milan, Italy
| | - F Biscarini
- Institute of Agricultural Biology and Biotechnology (IBBA), Italian National Research Council (CNR), Via Einstein, 26900, Lodi, Italy
| | - B Castiglioni
- Institute of Agricultural Biology and Biotechnology (IBBA), Italian National Research Council (CNR), Via Einstein, 26900, Lodi, Italy
| | - Ç Greco
- Institute of Sciences of Food Production (ISPA), Italian National Research Council (CNR), Via Amendola 122/O, 70126, Bari, Italy
| | - V D'Ascanio
- Institute of Sciences of Food Production (ISPA), Italian National Research Council (CNR), Via Amendola 122/O, 70126, Bari, Italy
| | - D Mora
- Department of Food, Environmental and Nutritional Sciences (DeFENS), University of Milan, Via Celoria 2, 20133, Milan, Italy
| | - M Brasca
- Institute of Sciences of Food Production (ISPA), Italian National Research Council (CNR), Via Celoria 2, 20133, Milan, Italy
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Oberg TS, McMahon DJ, Culumber MD, McAuliffe O, Oberg CJ. Invited review: Review of taxonomic changes in dairy-related lactobacilli. J Dairy Sci 2022; 105:2750-2770. [DOI: 10.3168/jds.2021-21138] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Accepted: 12/13/2021] [Indexed: 11/19/2022]
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Isolation and Identification of Lactic Acid Bacteria from Natural Whey Cultures of Buffalo and Cow Milk. Foods 2022; 11:foods11020233. [PMID: 35053966 PMCID: PMC8774387 DOI: 10.3390/foods11020233] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2021] [Revised: 12/24/2021] [Accepted: 01/11/2022] [Indexed: 11/17/2022] Open
Abstract
In southern Italy, some artisanal farms produce mozzarella and caciocavallo cheeses by using natural whey starter (NWS), whose microbial diversity is responsible for the characteristic flavor and texture of the final product. We studied the microbial community of NWS cultures of cow’s milk (NWSc) for the production of caciocavallo and buffalo’s milk (NWSb) for the production of mozzarella, both from artisanal farms. Bacterial identification at species and strain level was based on an integrative strategy, combining culture-dependent (sequencing of the 16S rDNA, species/subspecies-specific Polymerase Chain Reaction (PCR) and clustering by Random Amplified Polymorphic DNA-Polymerase Chain Reaction (RAPD-PCR) and culture-independent (next-generation sequencing analysis, NGS) approaches. Results obtained with both approaches showed the occurrence of five species of lactic acid bacteria in NWSb (Lactococcus lactis subsp. lactis, Lactobacillus fermentum, Streptococcus thermophilus, Lactobacillus delbrueckii, and Lactobacillus helveticus) and five species in NWSc (Lc. lactis subsp. lactis, Enterococcus faecium, and S. thermophilus, Lb. helveticus, and Lb. delbrueckii), with the last two found only by the NGS analysis. Moreover, RAPD profiles, performed on Lc. lactis subsp. lactis different isolates from both NWSs, showed nine strains in NWSb and seven strains in NWSc, showing a microbial diversity also at strain level. Characterization of the microbiota of natural whey starters aims to collect new starter bacteria to use for tracing microbial community during the production of artisanal cheeses, in order to preserve their quality and authenticity, and to select new Lactic Acid Bacteria (LAB) strains for the production of functional foods.
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Giraffa G. The Microbiota of Grana Padano Cheese. A Review. Foods 2021; 10:2632. [PMID: 34828913 PMCID: PMC8621370 DOI: 10.3390/foods10112632] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Revised: 10/27/2021] [Accepted: 10/28/2021] [Indexed: 12/23/2022] Open
Abstract
Grana Padano (GP) is the most appreciated and marketed cheese with Protected Designation of Origin in the world. The use of raw milk, the addition of undefined cultures (defined as 'sieroinnesto naturale'), the peculiar manufacturing proces, and the long ripening make the cheese microbiota play a decisive role in defining the quality and the organoleptic properties of the product. The knowledge on the microbial diversity associated with GP has been the subject, in recent years, of several studies aimed at understanding its composition and characteristics in order, on the one hand, to improve its technological performances and, on the other hand, to indirectly enhance the nutritional quality of the product. This review aims to briefly illustrate the main available knowledge on the composition and properties of the GP microbiota, inferred from dozens of studies carried out by both classical microbiology techniques and metagenomic analysis. The paper will essentially, but not exclusively, be focused on the lactic acid bacteria (LAB) derived from starter (SLAB) and the non-starter bacteria, both lactic (NSLAB) and non-lactic, of milk origin.
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Affiliation(s)
- Giorgio Giraffa
- Council for Agricultural Research and Economics, Research Centre for Animal Production and Aquaculture (CREA-ZA), Via Lombardo 11, 26900 Lodi, Italy
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Autochthonous Natural Starter Cultures: A Chance to Preserve Biodiversity and Quality of Pecorino Romano PDO Cheese. SUSTAINABILITY 2021. [DOI: 10.3390/su13158214] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
During Pecorino Romano PDO cheese production, scotta (residual whey from ricotta cheese manufacturing) or siero (whey) can be integrated with autochthonous starters, natural and composed of an indefinite number of species and strains, or commercial selected starters to obtain scotta/siero-innesto. In this study, three biodiverse autochthonous natural starter cultures (SR30, SR56, and SR63) belonging to the Agris Sardegna BNSS microbial collection, composed of different strains belonging to the species Streptococcus thermophilus, Lactobacillus delbrueckii subsp. bulgaricus, Enterococcus faecium, and Limosilactobacillus reuteri were lyophilized and combined into two starter mixes (A and B). The scotta/siero-innesto and the Pecorino Romano obtained using natural starters were compared with those obtained using commercial selected starters during three seasons of the cheesemaking campaign. Different pH and microbial compositions for the scotta/siero-innesto obtained using natural or commercial starters were found, attributable to their different biodiversity. The six-month-ripened cheese microbiota was influenced mostly by the season of cheesemaking, whereas physico-chemical and sensory analyses did not highlight differences among the products obtained. In general, no effect attributable to the type of scotta/siero-innesto used was observed, allowing the conclusion that natural starter cultures can be used also in industrial-scale production, ensuring high stability in the technological performances and preserving the microbial, chemical, and sensory characteristics of Pecorino Romano PDO cheese.
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Chessa L, Paba A, Daga E, Caredda M, Comunian R. Optimization of scotta as growth medium to preserve biodiversity and maximise bacterial cells concentration of natural starter cultures for Pecorino Romano PDO cheese. FEMS Microbiol Lett 2020; 367:5874251. [PMID: 32691846 DOI: 10.1093/femsle/fnaa110] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Accepted: 06/25/2020] [Indexed: 11/13/2022] Open
Abstract
Preservation of cheese microbiota biodiversity is central to the sensory quality of traditional and PDO cheeses. Lyophilized commercial selected starters, being advantageous in terms of cells concentration, are supplanting natural cultures causing important loss of microbial biodiversity in the dairy environment. Biodiversity could be recovered using natural starter cultures, however their cells concentration after propagation is lower than the commercial ones. Two autochthonous and biodiverse starter cultures (MixA and MixB) coming from scotta (residual whey from Ricotta cheese manufacture), collected in the 1960 s from Pecorino Romano PDO cheese manufactures, were revitalized in reconstituted commercial powder scotta. The aim of this study was the propagation of the microbial starter mixes increasing their bacterial concentration in the pellet, reducing nonessential scotta components by a fast and not-expensive method, without changing the microbial community balance. The behaviour of each mix inoculated in scotta was compared to that in half-concentrated, clarified, and half-concentrated-clarified scotta. Higher cells concentration in the pellets from the modified scotta was obtained, without changing technological performances and microbial fingerprint. The pellets obtained were reinoculated in commercial scotta for the preparation of the scotta-innesto (the typical starter for Pecorino Romano), and no differences were observed among the treatments after incubation. The reduction of nonessential scotta's components could help the reproduction of natural starter cultures preserving their properties.
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Affiliation(s)
- Luigi Chessa
- AGRIS Sardegna, Loc. Bonassai, S.S.291 km 18.600, 07100 Sassari, Italy
| | - Antonio Paba
- AGRIS Sardegna, Loc. Bonassai, S.S.291 km 18.600, 07100 Sassari, Italy
| | - Elisabetta Daga
- AGRIS Sardegna, Loc. Bonassai, S.S.291 km 18.600, 07100 Sassari, Italy
| | - Marco Caredda
- AGRIS Sardegna, Loc. Bonassai, S.S.291 km 18.600, 07100 Sassari, Italy
| | - Roberta Comunian
- AGRIS Sardegna, Loc. Bonassai, S.S.291 km 18.600, 07100 Sassari, Italy
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Morandi S, Battelli G, Silvetti T, Goss A, Cologna N, Brasca M. How the biodiversity loss in natural whey culture is affecting ripened cheese quality? The case of Trentingrana cheese. Lebensm Wiss Technol 2019. [DOI: 10.1016/j.lwt.2019.108480] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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10
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Paba A, Chessa L, Cabizza R, Daga E, Urgeghe PP, Testa MC, Comunian R. Zoom on starter lactic acid bacteria development into oxytetracycline spiked ovine milk during the early acidification phase. Int Dairy J 2019. [DOI: 10.1016/j.idairyj.2019.02.016] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Moser A, Berthoud H, Eugster E, Meile L, Irmler S. Detection and enumeration of Lactobacillus helveticus in dairy products. Int Dairy J 2017. [DOI: 10.1016/j.idairyj.2016.12.007] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Saxami G, Papadopoulou OS, Chorianopoulos N, Kourkoutas Y, Tassou CC, Galanis A. Molecular Detection of Two Potential Probiotic Lactobacilli Strains and Evaluation of Their Performance as Starter Adjuncts in Yogurt Production. Int J Mol Sci 2016; 17:E668. [PMID: 27153065 PMCID: PMC4881494 DOI: 10.3390/ijms17050668] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2016] [Revised: 04/24/2016] [Accepted: 04/28/2016] [Indexed: 12/14/2022] Open
Abstract
A molecular method for efficient and accurate detection and identification of two potential probiotic lactobacilli strains isolated from fermented olives, namely Lactobacillus pentosus B281 and Lb. plantarum B282, was developed in the present study. Random Amplified Polymorphic DNA (RAPD) analysis was performed, and strain specific primers were designed and applied in a multiplex polymerase chain reaction (PCR) assay. The specificity of the assay was tested and successfully confirmed in 27 and 22 lactobacilli strains for Lb. pentosus B281 and Lb. plantarum B282, respectively. Moreover, the two strains were used as starter cultures in yogurt production. Cell enumeration followed by multiplex PCR analysis demonstrated that the two strains were present in yogurt samples at levels ≥6 log CFU/g even after 35 days of storage at 4 °C. Microbiological analysis showed that lactobacilli and streptococci were present within usual levels, whereas enterobacteriaceae and yeast/mold counts were not detected as expected. Although the pH values of the novel products were slightly lower than the control ones, the yogurt containing the probiotic cultures scored similar values compared to the control in a series of sensory tests. Overall, these results demonstrated the possible use of the two strains as starter adjuncts in the production of yogurt with potential probiotic properties.
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Affiliation(s)
- Georgia Saxami
- Department of Molecular Biology and Genetics, Democritus University of Thrace, Alexandroupolis 68100, Greece.
| | - Olga S Papadopoulou
- Institute of Technology of Agricultural Products, Hellenic Agricultural Organization-DEMETER, Sof. Venizelou 1, Lycovrissi, Attiki 14123, Greece.
| | - Nikos Chorianopoulos
- Institute of Technology of Agricultural Products, Hellenic Agricultural Organization-DEMETER, Sof. Venizelou 1, Lycovrissi, Attiki 14123, Greece.
| | - Yiannis Kourkoutas
- Department of Molecular Biology and Genetics, Democritus University of Thrace, Alexandroupolis 68100, Greece.
| | - Chrysoula C Tassou
- Institute of Technology of Agricultural Products, Hellenic Agricultural Organization-DEMETER, Sof. Venizelou 1, Lycovrissi, Attiki 14123, Greece.
| | - Alex Galanis
- Department of Molecular Biology and Genetics, Democritus University of Thrace, Alexandroupolis 68100, Greece.
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Early Gut Colonization With Lactobacilli and Staphylococcus in Infants: The Hygiene Hypothesis Extended. J Pediatr Gastroenterol Nutr 2016; 62:80-6. [PMID: 26230902 DOI: 10.1097/mpg.0000000000000925] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
OBJECTIVES The aim of the present study was to assess the mode of delivery and type-of-feeding impact on gut microbiota. We demonstrated higher fecal bifidobacteria in infants who were breast-fed (BF) or fed formula with prebiotics polydextrose (PDX) and galactooligosaccharides (GOS) versus formula without prebiotics. Here, we tested feces of that cohort for lactobacilli and Staphylococcus aureus, 2 types of bacteria present in breast milk. METHODS In a double-blind, randomized study, 21- to 30-day-old term infants vaginally delivered and exclusively formula-fed received a cow's milk-based formula (control, n = 80) or the same formula with 4 g/L (1:1 ratio) of PDX/GOS (PDX/GOS, n = 77). A reference BF group (n = 71) was included. Stool samples were obtained at baseline and after 30 and 60 days of feeding to assess fecal bacteria by quantitative real-time polymerase chain reaction. RESULTS Pairwise comparisons between baseline-adjusted means log10 colony-forming unit per gram feces of total lactobacilli counts (8.37 in control, 8.46 in PDX/GOS, and 8.42 in BF) showed a significant difference only between PDX/GOS and control at 30 and 60 days combined (P = 0.035), utilizing generalized estimating equations method. Baseline-adjusted odds ratio (OR) of colonization with S aureus was lower in control (OR 0.47, 95% confidence interval 0.22-1.00, P = 0.049) and PDX/GOS (OR 0.44, 95% confidence interval 0.21-0.94, P = 0.03) groups versus the BF group. CONCLUSIONS Bacteria found in breast milk, such as lactobacilli and S aureus can also be found in infant feces. S aureus, traditionally considered harmful, may aid in educating the coevolving immune system. Modifying formula by adding prebiotics may bring gut microbiota closer to that of BF infants in terms of beneficial microbes.
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Galanis A, Kourkoutas Y, Tassou CC, Chorianopoulos N. Detection and Identification of Probiotic Lactobacillus plantarum Strains by Multiplex PCR Using RAPD-Derived Primers. Int J Mol Sci 2015; 16:25141-53. [PMID: 26506345 PMCID: PMC4632795 DOI: 10.3390/ijms161025141] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2015] [Revised: 10/02/2015] [Accepted: 10/16/2015] [Indexed: 11/21/2022] Open
Abstract
Lactobacillus plantarum 2035 and Lactobacillus plantarum ACA-DC 2640 are two lactic acid bacteria (LAB) strains that have been isolated from Feta cheese. Both display significant potential for the production of novel probiotic food products. The aim of the present study was the development of an accurate and efficient method for the molecular detection and identification of the above strains in a single reaction. A multiplex PCR assay was designed for each strain, based on specific primers derived from Random Amplified Polymorphic DNA (RAPD) Sequenced Characterized Amplified Region (SCAR) analysis. The specificity of the assay was tested with a total of 23 different LAB strains, for L. plantarum 2035 and L. plantarum ACA-DC 2640. The multiplex PCR assay was also successfully applied for the detection of the above cultures in yogurt samples prepared in our lab. The proposed methodology may be applied for monitoring the presence of these strains in food products, thus evaluating their probiotic character. Moreover, our strategy may be adapted for other novel LAB strains with probiotic potential, thus providing a powerful tool for molecular discrimination that could be invaluable to the food industry.
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Affiliation(s)
- Alex Galanis
- Department of Molecular Biology and Genetics, Democritus University of Thrace, Alexandroupolis 68100, Greece.
| | - Yiannis Kourkoutas
- Department of Molecular Biology and Genetics, Democritus University of Thrace, Alexandroupolis 68100, Greece.
| | - Chrysoula C Tassou
- Institute of Technology of Agricultural Products, Hellenic Agricultural Organization-DEMETER, Sof. Venizelou 1, Lycovrissi, Attiki 14123, Greece.
| | - Nikos Chorianopoulos
- Institute of Technology of Agricultural Products, Hellenic Agricultural Organization-DEMETER, Sof. Venizelou 1, Lycovrissi, Attiki 14123, Greece.
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Tropcheva R, Nikolova D, Evstatieva Y, Danova S. Antifungal activity and identification of Lactobacilli, isolated from traditional dairy product "katak". Anaerobe 2014; 28:78-84. [PMID: 24887637 DOI: 10.1016/j.anaerobe.2014.05.010] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2014] [Revised: 05/19/2014] [Accepted: 05/21/2014] [Indexed: 01/27/2023]
Abstract
Filamentous moulds are the main spoilage microorganisms, responsible for significant economic losses and several healthy risks in human food chain. The lactic acid bacteria (LAB), especially lactobacilli could be a natural antagonist of these dangerous organisms. In Bulgaria, a very limited data exists on the antifungal activity of LAB microbiota of fermented dairy products. In the present study, four active strains were isolated from traditional fermented curd/yogurt-like product "katak", produced in Bulgaria from centuries. The new isolates KR3, KR4, KR51 and KR53 were identified by API 50 CH biochemical test and different molecular methods (species-specific PCR, RAPD-PCR and 16S rDNA sequence analysis) as Lactobacillus brevis. According to our knowledge, this is the first data on the molecular characterization of the Lactobacillus microbiota of "katak". A broad spectrum of antifungal activity of the four L. brevis KR strains against test-cultures representatives of carcinogenic, toxigenic, deteriorative and allergenic fungi from the genera Aspergillus, Fusarium, Penicillium and Trichoderma was estimated. Strains L. brevis KR3, KR4 and KR51 completely suppress the growth of Penicillium claviforme, Aspergillus awamori and Aspergillus niger. With regard to Aspergillus flavus and Trichoderma viride, a lower and strain-specific inhibitory activity was observed. The antifungal activity of our new L. brevis isolates seems to be a promising advantage of these four strains, suggesting their potential applications in different food technologies as bio-preservative agents against moulds.
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Affiliation(s)
- Rositsa Tropcheva
- Department of General Microbiology, The Stephan Angeloff Institute of Microbiology, Bulgarian Academy of Sciences, 26, Acad. G. Bontchev Str., 1113 Sofia, Bulgaria
| | - Dilyana Nikolova
- Department of Biotechnology, Faculty of Biology, Sofia University St. Kliment Ohridski, 8, Dragan Tsankov Blvd., 1164 Sofia, Bulgaria
| | - Yana Evstatieva
- Department of Biotechnology, Faculty of Biology, Sofia University St. Kliment Ohridski, 8, Dragan Tsankov Blvd., 1164 Sofia, Bulgaria
| | - Svetla Danova
- Department of General Microbiology, The Stephan Angeloff Institute of Microbiology, Bulgarian Academy of Sciences, 26, Acad. G. Bontchev Str., 1113 Sofia, Bulgaria.
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Gatti M, Bottari B, Lazzi C, Neviani E, Mucchetti G. Invited review: Microbial evolution in raw-milk, long-ripened cheeses produced using undefined natural whey starters. J Dairy Sci 2014; 97:573-91. [DOI: 10.3168/jds.2013-7187] [Citation(s) in RCA: 131] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2013] [Accepted: 10/09/2013] [Indexed: 11/19/2022]
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18
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Jebava I, Chuat V, Lortal S, Valence F. Peptidoglycan hydrolases as species-specific markers to differentiate Lactobacillus helveticus from Lactobacillus gallinarum and other closely related homofermentative lactobacilli. Curr Microbiol 2013; 68:551-7. [PMID: 24362553 DOI: 10.1007/s00284-013-0512-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2013] [Accepted: 10/29/2013] [Indexed: 02/05/2023]
Abstract
We propose a new method that allows accurate discrimination of Lactobacillus helveticus from other closely related homofermentative lactobacilli, especially Lactobacillus gallinarum. This method is based on the amplification by PCR of two peptidoglycan hydrolytic genes, Lhv_0190 and Lhv_0191. These genes are ubiquitous and show high homology at the intra-species level. The PCR method gave two specific PCR products, of 542 and 747 bp, for 25 L. helveticus strains coming from various sources. For L. gallinarum, two amplicons were obtained, the specific 542 bp amplicon and another one with a size greater than 1,500 bp. No specific PCR products were obtained for 12 other closely related species of lactobacilli, including the L. acidophilus complex, L. delbrueckii, and L. ultunensis. The developed PCR method provided rapid, precise, and easy identification of L. helveticus. Moreover, it enabled differentiation between the two closely phylogenetically related species L. helveticus and L. gallinarum.
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Affiliation(s)
- Iva Jebava
- Department of Dairy, Fat and Cosmetic Science, Institute of Chemical Technology, Prague, Czech Republic,
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19
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Pogačić T, Mancini A, Santarelli M, Bottari B, Lazzi C, Neviani E, Gatti M. Diversity and dynamic of lactic acid bacteria strains during aging of a long ripened hard cheese produced from raw milk and undefined natural starter. Food Microbiol 2013; 36:207-15. [DOI: 10.1016/j.fm.2013.05.009] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2013] [Revised: 05/12/2013] [Accepted: 05/28/2013] [Indexed: 12/01/2022]
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Herbel SR, Vahjen W, Wieler LH, Guenther S. Timely approaches to identify probiotic species of the genus Lactobacillus. Gut Pathog 2013; 5:27. [PMID: 24063519 PMCID: PMC3848994 DOI: 10.1186/1757-4749-5-27] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/08/2013] [Accepted: 09/14/2013] [Indexed: 12/23/2022] Open
Abstract
Over the past decades the use of probiotics in food has increased largely due to the manufacturer’s interest in placing “healthy” food on the market based on the consumer’s ambitions to live healthy. Due to this trend, health benefits of products containing probiotic strains such as lactobacilli are promoted and probiotic strains have been established in many different products with their numbers increasing steadily. Probiotics are used as starter cultures in dairy products such as cheese or yoghurts and in addition they are also utilized in non-dairy products such as fermented vegetables, fermented meat and pharmaceuticals, thereby, covering a large variety of products. To assure quality management, several pheno-, physico- and genotyping methods have been established to unambiguously identify probiotic lactobacilli. These methods are often specific enough to identify the probiotic strains at genus and species levels. However, the probiotic ability is often strain dependent and it is impossible to distinguish strains by basic microbiological methods. Therefore, this review aims to critically summarize and evaluate conventional identification methods for the genus Lactobacillus, complemented by techniques that are currently being developed.
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Affiliation(s)
- Stefan R Herbel
- Centre for Infection Medicine, Institute of Microbiology and Epizootics, Freie Universität Berlin, Robert-von-Ostertag-Str, 7-13, Berlin, 14163, Germany.
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Neviani E, Bottari B, Lazzi C, Gatti M. New developments in the study of the microbiota of raw-milk, long-ripened cheeses by molecular methods: the case of Grana Padano and Parmigiano Reggiano. Front Microbiol 2013; 4:36. [PMID: 23450500 PMCID: PMC3584316 DOI: 10.3389/fmicb.2013.00036] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2012] [Accepted: 02/09/2013] [Indexed: 12/01/2022] Open
Abstract
Microorganisms are an essential component of cheeses and play important roles during both cheese manufacture and ripening. Both starter and secondary flora modify the physical and chemical properties of cheese, contributing and reacting to changes that occur during the manufacture and ripening of cheese. As the composition of microbial population changes under the influence of continuous shifts in environmental conditions and microorganisms interactions during manufacturing and ripening, the characteristics of a given cheese depend also on microflora dynamics. The microbiota present in cheese is complex and its growth and activity represent the most important, but the least controllable steps. In the past, research in this area was dependent on classical microbiological techniques. However, culture-dependent methods are time-consuming and approaches that include a culturing step can lead to inaccuracies due to species present in low numbers or simply uncultivable. Therefore, they cannot be used as a unique tool to monitor community dynamics. For these reasons approaches to cheese microbiology had to change dramatically. To address this, in recent years the focus on the use of culture-independent methods based on the direct analysis of DNA (or RNA) has rapidly increased. Application of such techniques to the study of cheese microbiology represents a rapid, sound, reliable, and effective way for the detection and identification of the microorganisms present in dairy products, leading to major advances in understanding this complex microbial ecosystem and its impact on cheese ripening and quality. In this article, an overview on the recent advances in the use of molecular methods for thorough analysis of microbial communities in cheeses is given. Furthermore, applications of culture-independent approaches to study the microbiology of two important raw-milk, long-ripened cheeses such as Grana Padano and Parmigiano Reggiano, are presented.
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Affiliation(s)
- Erasmo Neviani
- Department of Food Science, University of ParmaParma, Italy
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Bottari B, Agrimonti C, Gatti M, Neviani E, Marmiroli N. Development of a multiplex real time PCR to detect thermophilic lactic acid bacteria in natural whey starters. Int J Food Microbiol 2012; 160:290-7. [PMID: 23290237 DOI: 10.1016/j.ijfoodmicro.2012.10.011] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2012] [Revised: 10/08/2012] [Accepted: 10/19/2012] [Indexed: 10/27/2022]
Abstract
A multiplex real time PCR (mRealT-PCR) useful to rapidly screen microbial composition of thermophilic starter cultures for hard cooked cheeses and to compare samples with potentially different technological properties was developed. Novel primers directed toward pheS gene were designed and optimized for multiple detection of Lactobacillus helveticus, Lactobacillus delbrueckii, Streptococcus thermophilus and Lactobacillus fermentum. The assay was based on SYBR Green chemistry followed by melting curves analysis. The method was then evaluated for applications in the specific detection of the 4 lactic acid bacteria (LAB) in 29 different natural whey starters for Parmigiano Reggiano cheese production. The results obtained by mRealT-PCR were also compared with those obtained on the same samples by Fluorescence in Situ Hybridization (FISH) and Length-Heterogeneity PCR (LH-PCR). The mRealT-PCR developed in this study, was found to be effective for analyzing species present in the samples with an average sensitivity down to less than 600 copies of DNA and therefore sensitive enough to detect even minor LAB community members of thermophilic starter cultures. The assay was able to describe the microbial population of all the different natural whey starter samples analyzed, despite their natural variability. A higher number of whey starter samples with S. thermophilus and L. fermentum present in their microbial community were revealed, suggesting that these species could be more frequent in Parmigiano Reggiano natural whey starter samples than previously shown. The method was more effective than LH-PCR and FISH and, considering that these two techniques have to be used in combination to detect the less abundant species, the mRealT-PCR was also faster. Providing a single step sensitive detection of L. helveticus, L. delbrueckii, S. thermophilus and L. fermentum, the developed mRealT-PCR could be used for screening thermophilic starter cultures and to follow the presence of those species during ripening of derived dairy products. A major increase in understanding the starter culture contribution to cheese ecosystem could be harnessed to control cheese ripening and flavor formation.
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Affiliation(s)
- Benedetta Bottari
- Department of Food Science, University of Parma, Parco Area delle Scienze 95/A, Parma, Italy
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