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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Biopreservation and probiotic potential of a large set of lactic acid bacteria isolated from Brazilian artisanal cheeses: From screening to in product approach

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Author(s):
Margalho, Larissa P. [1] ; Jorge, Genesy P. [2] ; Noleto, Deise A. P. [1] ; Silva, Christian E. [1] ; Abreu, Julia S. [1] ; Piran, Marcos V. F. [1] ; Brocchi, Marcelo [2] ; Sant'Ana, Anderson S. [1]
Total Authors: 8
Affiliation:
[1] Univ Estadual Campinas, Fac Food Engn, Dept Food Sci & Nutr, Campinas, SP - Brazil
[2] Univ Estadual Campinas, Inst Biol, Dept Genet Evolut Microbiol & Immunol, Trop Dis Lab, Campinas, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: MICROBIOLOGICAL RESEARCH; v. 242, JAN 2021.
Web of Science Citations: 3
Abstract

The increasing interest in products with functional properties has encouraged the search for new lactic acid bacteria (LAB) present in natural sources, as traditional fermented foods. In this study, a large set of wild LAB isolates (n = 220) from Brazilian artisanal cheeses (BAC) were assessed for their probiotic and biopreservation potential. First, the rational selection was performed. From the tested isolates, 92 (41.8 %) were resistant to low pH (2 and 3). These isolates were submitted to bile salt (0.4 % Oxgall powder) resistance, and 22 were selected and submitted to adhesion assays. The autoaggregation values ranged from 68.5-99% and were considered moderate to high (20-70 %). Hydrophobicity values varied significantly between LAB (5.0-64.3%), and seven isolates presented values higher than 40 %. All selected LAB (n=22) were capable of adhering to Caco-2 (> 70 %) cells, and none isolate displayed any tested gene for biogenic amine production. Most isolates (18/22) showed less than 1 log CFU reduction after passage through the simulated gastrointestinal tract (GIT) conditions. A total of twenty isolates satisfied key in vitro criteria to be considered as probiotics. A hierarchical cluster analysis (HCA) was performed, and two clusters were observed, showing high variability between Lactobacillus plantarum isolates regarding adhesion properties and survival to GIT stress and one influence of the source of isolation on these properties. After screening, the antimicrobial activity of Lb. plantarum (1QB77) was tested in microcheeses in which survival of two relevant pathogenic bacteria (Staphylococcus aureus and Listeria monocytogenes) was monitored along ripening and after a simulated GIT passage, concomitantly. L. plantarum (1QB77) has shown the ability to reach high counts (similar to 9 log CFU/g) at the end of ripening. This isolate was also able to reduce counts of S. aureus and L. monocytogenes in microcheeses in approx. 2.3 and 2.5 log CFU/g, respectively, until the 21st day of ripening; and about 3.2 and 3.5 log CFU/g after simulated GIT passage. Overall, the assessment of the pro biotic properties of a large set of LAB was fundamental for gaining insights on the technological, functional, and potential regional traits of wild LAB isolates that can be used to develop starter cultures for tailored applications. (AU)

FAPESP's process: 17/03899-5 - Acid lactic bacteria and yeasts in Brazilian artisanal cheeses: characterization and selection by evolutionary engineering to improve cheese processing
Grantee:Larissa Pereira Margalho
Support Opportunities: Scholarships abroad - Research Internship - Doctorate (Direct)
FAPESP's process: 15/25641-4 - Lactic acid bacteria in Brazilian artisanal cheeses: application of Evolutionary Engineering for culture improvement aiming at accelerating cheese ripening
Grantee:Larissa Pereira Margalho
Support Opportunities: Scholarships in Brazil - Doctorate (Direct)