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Bettera L, Levante A, Bancalari E, Bottari B, Cirlini M, Neviani E, Gatti M. Lacticaseibacillus Strains Isolated from Raw Milk: Screening Strategy for Their Qualification as Adjunct Culture in Cheesemaking. Foods 2023; 12:3949. [PMID: 37959068 PMCID: PMC10648420 DOI: 10.3390/foods12213949] [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: 09/26/2023] [Revised: 10/19/2023] [Accepted: 10/23/2023] [Indexed: 11/15/2023] Open
Abstract
The microbial ecology fundamentals of raw milk and long-ripened cheeses consist of a complex interaction between starter lactic acid bacteria (SLAB) and non-starter LAB (NSLAB). Although NSLAB aromatic properties are paramount, other phenotypic traits need to be considered for their use as adjunct cultures, such as the capability to endure technological parameters encountered during cheesemaking. The present study focused on the isolation and characterization of NSLAB from spontaneously fermented raw cow's milk coming from 20 dairies that produce Grana Padano PDO cheese. From 122 isolates, the screening process selected the 10 most diverse strains belonging to Lacticaseibacillus spp. to be phenotypically characterized. The strains were tested for their growth performance in milk in combination with the application of technological stresses, for their ability to produce volatile compounds after their growth in milk, and for their ability to use different nutrient sources and resist chemicals. The complex characterization qualified the strains 5959_Lbparacasei and 5296_Lbparacasei as the best candidates to be used as adjunct strains in the production of raw milk and long-ripened cheeses, provided that antibiotic resistance is measured before their employment. Other strains with interesting aromatic capabilities but lower heat resistance were 5293_Lbparacasei, 5649_Lbparacasei and 5780_Lbparacasei, which could be candidates as adjunct strains for uncooked cheese production.
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Affiliation(s)
| | - Alessia Levante
- Department of Food and Drug, University of Parma, 43124 Parma, Italy; (L.B.); (E.B.); (B.B.); (M.C.); (E.N.); (M.G.)
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Vélez MA, Wolf VI, Espariz M, Acciarri G, Magni C, Hynes E, Perotti MC. Study of volatile compounds profiles in milk matrices using Enterococcus faecalis EstA and Rhizomucor miehei lipase. Food Res Int 2023; 169:112861. [PMID: 37254435 DOI: 10.1016/j.foodres.2023.112861] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Revised: 02/02/2023] [Accepted: 04/17/2023] [Indexed: 06/01/2023]
Abstract
The use of esterase/lipase enzymes of different origins in food industry is a widely employed strategy to enhance the formation of characteristic aromatic compounds derived from fat and diversify flavour. In the present work, we studied EstA enzyme of Enterococcus faecalis and a high purity Rhizomucor miehei lipase (Palatase). EstA was obtained recombinantly in Escherichia coli BL21 (DE3), and optimum esterase activity was detected at pH 6.75 and 40 °C. We evaluated the effect of the enzymes on milk mixtures prepared with different fat contents (2.8 and 6%) and structure (native or homogenized) on volatile compounds profiles. The milk fat structure before and after the application of low homogenization was characterized by dynamic light dispersion and microscopy. Native milk fat mixtures presented particles of 4.6 μm and 184 nm and homogenized mixtures had particles of 1.4 μm and 258 nm; microscopy images were in concordance with these results. Fifteen volatile compounds were identified, including ketones, esters, alcohols, and acids. We showed the key role of milk fat levels and microstructure in the nature of the volatile compounds produced by the R. miehei enzyme. Both in native or homogenized states, the highest content of fat favored a higher production of acids whereas the lowest fat level favored a higher esters production along with a more balanced volatile profile. For EstA enzyme, results showed a limited action on fat, as biosynthesis of esters only increased with the highest fat level homogenized.
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Affiliation(s)
- María A Vélez
- Instituto de Lactología Industrial (INLAIN, Universidad Nacional del Litoral/CONICET), Facultad de Ingeniería Química, Santiago del Estero 2829, S3000AOM, Santa Fe, Argentina.
| | - Verónica I Wolf
- Instituto de Lactología Industrial (INLAIN, Universidad Nacional del Litoral/CONICET), Facultad de Ingeniería Química, Santiago del Estero 2829, S3000AOM, Santa Fe, Argentina
| | - Martín Espariz
- Instituto de Biología Molecular y Celular de Rosario (IBR-CONICET), Suipacha 590, 2000, Rosario, Santa Fe, Argentina
| | - Giuliana Acciarri
- Instituto de Biología Molecular y Celular de Rosario (IBR-CONICET), Suipacha 590, 2000, Rosario, Santa Fe, Argentina
| | - Christian Magni
- Instituto de Biología Molecular y Celular de Rosario (IBR-CONICET), Suipacha 590, 2000, Rosario, Santa Fe, Argentina
| | - Erica Hynes
- Instituto de Lactología Industrial (INLAIN, Universidad Nacional del Litoral/CONICET), Facultad de Ingeniería Química, Santiago del Estero 2829, S3000AOM, Santa Fe, Argentina
| | - María C Perotti
- Instituto de Lactología Industrial (INLAIN, Universidad Nacional del Litoral/CONICET), Facultad de Ingeniería Química, Santiago del Estero 2829, S3000AOM, Santa Fe, Argentina
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Shi Z, Li X, Fan X, Xu J, Liu Q, Wu Z, Pan D. PMA-qPCR method for the selective quantitation of viable lactic acid bacteria in fermented milk. Front Microbiol 2022; 13:984506. [PMID: 36160254 PMCID: PMC9491339 DOI: 10.3389/fmicb.2022.984506] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2022] [Accepted: 08/15/2022] [Indexed: 11/13/2022] Open
Abstract
The number of viable lactic acid bacteria (LAB) is a key indicator of the quality of fermented milk. Currently, the combination of propidium monoazide (PMA) and qPCR has been applied in the quantification of viable bacteria in various matrices. In this research, the PMA-qPCR method was used to detect the number of viable bacteria of each LAB species in fermented milk. By analyzing pheS gene and 16S rRNA gene sequence similarities in five species of LAB, namely Lactobacillus delbrueckii subsp. bulgaricus, Lactiplantibacillus plantarum, Streptococcus thermophilus, Lactobacillus helveticus, and Lactococcus lactis subsp. lactis, the pheS gene resolved species identities better and was thus selected to design specific primers and probes. The pheS gene was cloned into the pUC19 vector and used to construct a standard curve for absolute quantification. Standard curves for quantification were constructed for each LAB species for serial dilutions between 1011 and 106 CFU/mL, with R2 > 0.99. The number of viable bacteria in the fermented milk detected by PMA-qPCR was significantly lower than that of qPCR (P < 0.05), indicating that PMA inhibited the amplification of DNA from dead cells. This was corroborated by the results from bacterial staining and plate count experiments. The proposed PMA-qPCR method provided rapid qualitative and quantitative determination of the number of viable bacteria for each LAB species in fermented milk within 3 h.
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Affiliation(s)
- Zihang Shi
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Ningbo University, Ningbo, China
- Key Laboratory of Animal Protein Food Processing Technology of Zhejiang Province, College of Food and Pharmaceutical Sciences, Ningbo University, Ningbo, China
| | - Xiefei Li
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Ningbo University, Ningbo, China
- Key Laboratory of Animal Protein Food Processing Technology of Zhejiang Province, College of Food and Pharmaceutical Sciences, Ningbo University, Ningbo, China
| | - Xiankang Fan
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Ningbo University, Ningbo, China
- Key Laboratory of Animal Protein Food Processing Technology of Zhejiang Province, College of Food and Pharmaceutical Sciences, Ningbo University, Ningbo, China
| | - Jue Xu
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Ningbo University, Ningbo, China
- Key Laboratory of Animal Protein Food Processing Technology of Zhejiang Province, College of Food and Pharmaceutical Sciences, Ningbo University, Ningbo, China
| | - Qing Liu
- Nanjing Dairy Group, Nanjing, China
| | - Zhen Wu
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Ningbo University, Ningbo, China
- Key Laboratory of Animal Protein Food Processing Technology of Zhejiang Province, College of Food and Pharmaceutical Sciences, Ningbo University, Ningbo, China
- *Correspondence: Zhen Wu,
| | - Daodong Pan
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Ningbo University, Ningbo, China
- Key Laboratory of Animal Protein Food Processing Technology of Zhejiang Province, College of Food and Pharmaceutical Sciences, Ningbo University, Ningbo, China
- Daodong Pan,
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Munekata PES, Chaves-Lopez C, Fernandez-Lopez J, Viuda-Martos M, Sayas-Barbera ME, Perez-Alvarez JA, Lorenzo JM. Autochthonous Starter Cultures in Cheese Production – A Review. FOOD REVIEWS INTERNATIONAL 2022. [DOI: 10.1080/87559129.2022.2097691] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Affiliation(s)
| | - Clemencia Chaves-Lopez
- Faculty of Bioscience and Technology for Food, Agriculture and Environment, University of Teramo, Teramo, Italy
| | - Juana Fernandez-Lopez
- IPOA Research Group. Centro de Investigación e Innovación Agroalimentaria y Agroambiental (CIAGRO-UMH), Miguel Hernandez University, Alicante, Spain
| | - Manuel Viuda-Martos
- IPOA Research Group. Centro de Investigación e Innovación Agroalimentaria y Agroambiental (CIAGRO-UMH), Miguel Hernandez University, Alicante, Spain
| | - María Estrella Sayas-Barbera
- IPOA Research Group. Centro de Investigación e Innovación Agroalimentaria y Agroambiental (CIAGRO-UMH), Miguel Hernandez University, Alicante, Spain
| | - José Angel Perez-Alvarez
- IPOA Research Group. Centro de Investigación e Innovación Agroalimentaria y Agroambiental (CIAGRO-UMH), Miguel Hernandez University, Alicante, Spain
| | - José M. Lorenzo
- Centro Tecnológico de la Carne de Galicia, Ourense, Spain
- Área de Tecnoloxía dos Alimentos, Facultade de Ciencias, Universidade de Vigo, Ourense, España
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Castellani C, Obermüller B, Kienesberger B, Singer G, Peterbauer C, Grabherr R, Mayrhofer S, Klymiuk I, Horvath A, Stadlbauer V, Russmayer H, Miekisch W, Fuchs P, Till H, Heinl S. Production, Storage Stability, and Susceptibility Testing of Reuterin and Its Impact on the Murine Fecal Microbiome and Volatile Organic Compound Profile. Front Microbiol 2021; 12:699858. [PMID: 34394042 PMCID: PMC8361477 DOI: 10.3389/fmicb.2021.699858] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2021] [Accepted: 06/29/2021] [Indexed: 12/18/2022] Open
Abstract
Background: Probiotics are generally considered as safe, but infections may rarely occur in vulnerable patients. Alternatives to live microorganisms to manage dysbiosis may be of interest in these patients. Reuterin is a complex component system exhibiting broad spectrum antimicrobial activity and a possible candidate substance in these cases. Methods: Reuterin supernatant was cultured from Lentilactobacillus diolivorans in a bioreactor in a two-step process. Storage stability at −20°C and effect of repeated freeze-thaw cycles were assessed by high performance liquid chromatography (HPLC). Antimicrobial activity was tested against Clostridium difficile, Listeria monocytogenes, Escherichia coli, Enterococcus faecium, Staphylococcus (S.) aureus, Staphylococcus epidermidis, Streptococcus (S.) agalactiae, Propionibacterium acnes, and Pseudomonas aeruginosae. Male BALBc mice were gavage fed with reuterin supernatant (n = 10) or culture medium (n = 10). Fecal volatile organic compounds (VOC) were assessed by gas chromatography mass spectroscopy; the microbiome was examined by 16S rRNA gene sequencing. Results: The supernatant contained 13.4 g/L reuterin (3-hydroxypropionaldehyde; 3-HPA). 3-HPA content remained stable at −20°C for 35 days followed by a slow decrease of its concentration. Repeated freezing/thawing caused a slow 3-HPA decrease. Antimicrobial activity was encountered against S. aureus, S. epidermidis, and S. agalactiae. Microbiome analysis showed no differences in alpha and beta diversity markers. Linear discriminant effect size (LEfSe) analysis identified Lachnospiraceae_bacterium_COE1 and Ruminoclostridium_5_uncultured_Clostridiales_ bacterium (in the reuterin medium group) and Desulfovibrio_uncultured_ bacterium, Candidatus Arthromitus, Ruminococcae_NK4A214_group, and Eubacterium_xylanophilum_group (in the reuterin group) as markers for group differentiation. VOC analysis showed a significant decrease of heptane and increase of 3-methylbutanal in the reuterin group. Conclusion: The supernatant produced in this study contained acceptable amounts of 3-HPA remaining stable for 35 days at −20°C and exhibiting an antimicrobial effect against S. aureus, S. agalactiae, and S. epidermidis. Under in vivo conditions, the reuterin supernatant caused alterations of the fecal microbiome. In the fecal, VOC analysis decreased heptane and increased 3-methylbutanal were encountered. These findings suggest the high potential of the reuterin system to influence the intestinal microbiome in health and disease, which needs to be examined in detail in future projects.
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Affiliation(s)
- Christoph Castellani
- Department of Paediatric and Adolescent Surgery, Medical University of Graz, Graz, Austria
| | - Beate Obermüller
- Department of Paediatric and Adolescent Surgery, Medical University of Graz, Graz, Austria
| | - Bernhard Kienesberger
- Department of Paediatric and Adolescent Surgery, Medical University of Graz, Graz, Austria
| | - Georg Singer
- Department of Paediatric and Adolescent Surgery, Medical University of Graz, Graz, Austria
| | - Clemens Peterbauer
- Department of Food Science and Technology, University of Natural Resources and Life Sciences, Vienna, Austria
| | - Reingard Grabherr
- Department of Biotechnology, University of Natural Resources and Life Sciences, Vienna, Austria
| | - Sigrid Mayrhofer
- Department of Biotechnology, University of Natural Resources and Life Sciences, Vienna, Austria
| | - Ingeborg Klymiuk
- Core Facility of Molecular Biology, Medical University of Graz, Graz, Austria.,Department of Cell Biology, Histology and Embryology, Gottfried Schatz Research Center, Medical University of Graz, Graz, Austria
| | - Angela Horvath
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, Medical University of Graz, Graz, Austria.,Center of Biomarker Research in Medicine (CBmed), Graz, Austria
| | - Vanessa Stadlbauer
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, Medical University of Graz, Graz, Austria.,Center of Biomarker Research in Medicine (CBmed), Graz, Austria
| | - Hannes Russmayer
- Department of Biotechnology, University of Natural Resources and Life Sciences, Vienna, Austria.,CD Laboratory for Biotechnology of Glycerol, Vienna, Austria
| | - Wolfram Miekisch
- Department of Anesthesiology and Intensive Care, Experimental Research Center, University of Rostock, Rostock, Germany
| | - Patricia Fuchs
- Department of Anesthesiology and Intensive Care, Experimental Research Center, University of Rostock, Rostock, Germany
| | - Holger Till
- Department of Paediatric and Adolescent Surgery, Medical University of Graz, Graz, Austria
| | - Stefan Heinl
- Department of Biotechnology, University of Natural Resources and Life Sciences, Vienna, Austria
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Giménez P, Peralta G, Guglielmotti D, Audero G, Páez R, Hynes E, Bergamini C. Preventing undesired eye formation in soft cheese. Int Dairy J 2021. [DOI: 10.1016/j.idairyj.2020.104958] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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Margalho LP, Feliciano MD, Silva CE, Abreu JS, Piran MVF, Sant'Ana AS. Brazilian artisanal cheeses are rich and diverse sources of nonstarter lactic acid bacteria regarding technological, biopreservative, and safety properties-Insights through multivariate analysis. J Dairy Sci 2020; 103:7908-7926. [PMID: 32684468 DOI: 10.3168/jds.2020-18194] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Accepted: 05/06/2020] [Indexed: 12/20/2022]
Abstract
In this study a total of 220 isolates of lactic acid bacteria (LAB) recovered from 10 types of Brazilian artisanal cheeses marketed in 4 main regions of Brazil were evaluated regarding their safety and ability to produce diacetyl (a precursor of aromatic compounds), exopolysaccharides (EPS; from different sugar sources), and antagonistic activity against Listeria monocytogenes and Staphylococcus aureus. The results indicated that 131 isolates (59.6%) were classified as strong (40.5%) and moderate (19.1%) diacetyl producers; 28 isolates (12.7%) stood out due to their remarkable production of EPS from different sugars, including sucrose (3.2%), fructose (2.3%), lactose (2.3%), and glucose (6%). Furthermore, 94.1% and 95.9% of isolates presented antagonistic activity against S. aureus and L. monocytogenes, respectively, even though only 27 isolates (12.3%) exhibited positive results in the bacteriocin production test. None of the isolates tested presented hemolytic activity, and 117 were classified as safe, due to their intrinsic resistance to a maximum of 4 different antibiotics. The data obtained for assessment of antibiogram profile and technological potential (moderate and high production of diacetyl, EPS, and bacteriocins) were submitted to a multiple correspondence analysis to correlate them with the cheese of isolation. Regarding the antimicrobial profile of LAB strains, it was possible to verify an association between isolates from Minas artisanal cheeses from Araxá and resistance to tetracycline; Minas artisanal cheeses from Serro and resistance to erythromycin; Coalho and Minas artisanal cheese from Cerrado and resistance to penicillin; and isolates from Serrano and Colonial cheeses with clindamycin and ceftazidime resistance. Although the susceptibility of strains to these antibiotics was considered high (71.8-80.5%), these data may be related to the horizontal transfer of genes in the production chain of these cheeses. Results of multiple correspondence analysis also showed that isolates with antagonistic activity were mostly isolated from Manteiga, Colonial, and Coalho cheeses. The isolates with high or moderate EPS-producer ability from sucrose, glucose, and fructose were mainly associated with Minas artisanal cheeses from Cerrado. In contrast, isolates with high or moderate EPS-producer ability from lactose were isolated from Serrano, Minas artisanal cheeses from Canastra, and Campo das Vertentes microregions. Finally, isolates from Minas artisanal cheeses (from Araxá microregion), Coalho, and Caipira cheeses were associated with moderate/high diacetyl production. To the best of the authors' knowledge, this study provides, for the first time, data indicating that the dominant technological, biopreservative, and safety properties of LAB isolates can be correlated with the type of Brazilian artisanal cheeses, which denotes its singularity. This knowledge is of utmost relevance for the development of starter or adjunct cultures with tailored properties.
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Affiliation(s)
- Larissa P Margalho
- Department of Food Science, Faculty of Food Engineering, University of Campinas, Campinas, SP 13083-862, Brazil
| | - Marcelo D'Elia Feliciano
- Department of Food Science, Faculty of Food Engineering, University of Campinas, Campinas, SP 13083-862, Brazil
| | - Christian E Silva
- Department of Food Science, Faculty of Food Engineering, University of Campinas, Campinas, SP 13083-862, Brazil
| | - Júlia S Abreu
- Department of Food Science, Faculty of Food Engineering, University of Campinas, Campinas, SP 13083-862, Brazil
| | | | - Anderson S Sant'Ana
- Department of Food Science, Faculty of Food Engineering, University of Campinas, Campinas, SP 13083-862, Brazil.
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