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Positive interactions between lactic acid bacteria promoted by nitrogen-based nutritional dependencies

Abstract : Lactic acid bacteria (LAB) interactions are often studied in association with yeasts or propionibacteria in various fermented food products and the mechanisms underlying their interactions are being quite well characterized. Concerning interactions between LAB, which are responsible for the sanitary, organoleptic, and health properties of most fermented products, they have mainly been investigated to test antagonistic interactions. Understanding how they can positively interact could be useful in multiple food-related fields: production of fermented food products with enhanced functional properties or fermentation of new food matrices. Nutritional dependencies, especially those regarding nitrogen sources, govern numerous microbial positive interactions. As for LAB, such positive interactions, have previously been studied between yogurt bacteria. However, they have never been exploited to create artificial co-cultures of LAB that would not necessarily coexist naturally, i.e from different biotopes. The objective of this study was to promote LAB positive interactions based on nitrogen dependencies in co-cultures to increase acidification rates, carbohydrate consumption, and volatile compound production. The strategy was to exploit both proteolytic activities and amino acid auxotrophies of LAB. A chemically defined medium was thus developed to specifically allow the growth of six LAB strains used, three proteolytic and three non-proteolytic. Each of the proteolytic strains, Enterococcus faecalis CIRM-BIA2412, Lactococcus lactis NCDO2125, and CIRM-BIA244, was co-cultured with each one of the non-proteolytic LAB strains: L. lactis NCDO2111, Lactiplantibacillus plantarum CIRM-BIA465 and CIRM-BIA1524. Bacterial growth was monitored using compartmented chambers to compare growth in mono-and cocultures. Acidification, carbohydrate consumption and volatile compound production was evaluated in direct co-cultures. Each proteolytic strain induced different types of interactions: either strongly positive, weakly positive, or no interactions, with E. faecalis CIRM-BIA2412, L. lactis NCDO2125 and L. lactis CIRM-BIA244, respectively. Strong interactions were associated with higher concentrations in tryptophan, valine, phenylalanine, leucine, isoleucine, and peptides. They led to faster acidification rates, lower final pH, higher raffinose utilization, and higher concentrations in five volatile compounds.
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Submitted on : Monday, July 12, 2021 - 10:33:34 AM
Last modification on : Friday, May 20, 2022 - 9:04:57 AM


  • HAL Id : hal-03283721, version 1



Fanny Canon, Marie-Bernadette Maillard, Gwénaële Henry, Anne Thierry, Valérie Gagnaire. Positive interactions between lactic acid bacteria promoted by nitrogen-based nutritional dependencies. Les Journées Scientifiques de l'ED EGAAL, Jun 2021, Rennes, France. ⟨hal-03283721⟩



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