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Life sciences · Journal article
Functional Food Science - Online Issn 2767-3146 · August 25, 2026
Raises a question worth testing. It does not answer one.
This in vitro study reports that exopolysaccharides from Enterococcus strains antagonistically reduce the antimicrobial activity of bacteriocins by 10% to 64% in mixed-strain co-cultivation, challenging the assumption of additive effects in multi-metabolite postbiotic systems. The finding is exploratory and mechanism-focused; it does not establish clinical relevance or translate to efficacy in vivo.
In vitro experimental study. Probiotic bacterial strains from the Enterococcus genus and Lacticaseibacillus rhamnosus 2012; no human subjects enrolled.. Intervention: Co-cultivation of Enterococcus strains producing both exopolysaccharides and bacteriocins; purified exopolysaccharides combined with purified bacteriocins.. Compared with: Single postbiotics (exopolysaccharides or bacteriocins alone) or mixed-strain complexes..
Combination of exopolysaccharides with bacteriocins decreased overall antimicrobial activity by 10% to 64%, depending on strain origin and bacteriocin properties Antagonistic interaction observed in mixed-strain complex compared to single-strain postbiotics High-molecular-weight exopolysaccharides may structurally interfere with bacteriocin efficacy
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These findings suggest that designers of multi-strain probiotic formulations should account for potential antagonistic interactions between postbiotics during co-cultivation. However, the lack of in vivo or clinical data means this remains a laboratory observation that requires validation before informing clinical formulation decisions.
In vitro mechanistic study demonstrating antagonistic interactions between purified postbiotics in a single experimental system; raises questions about multi-strain formulation design but does not yet establish clinical or in vivo relevance.
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Quoted from the source exactly as published.
These findings suggest that designers of multi-strain probiotic formulations should account for potential antagonistic interactions between postbiotics during co-cultivation. However, the lack of in vivo or clinical data means this remains a laboratory observation that requires validation before informing clinical formulation decisions.
Graded across the dimensions that decide whether you should act, each from what the source actually supports. There is no single score, and where a dimension was not assessed it says so.
Background: Some lactic acid bacteria are known to synthesize postbiotics, including bacteriocins and exopolysaccharides. Bacteriocins have antimicrobial and anti-inflammatory effect, exopolysaccharides plays an important role in fermented dairy products and can also be beneficial to human health. The present study aimed to evaluate the concentration-dependent antimicrobial activity of postbiotics—bacteriocins and exopolysaccharides produced by probiotic strains of the Enterococcus genus during co-cultivation and interactions in vitro. Methods: Purification of postbiotics were carried out by gel filtration methodon Sephadex G-50 (exopolysaccharides) and G-25 (bacteriocins). Antimicrobial activity was determined following CLSI and EUCAST.The molecular weights of purified postbiotics were determined using fast protein liquid chromatography (FPLC). Results: Evaluation of exopolysaccharidesand bacteriocins derived from mixed-strain complex demonstrated a reduction in antimicrobial activity. In vitro assays showed that the combination of exopolysaccharide (Enterococcus genus) with bacteriocins (Lacticaseibacillus rhamnosus 2012 and strains of genus Enterococcus) decreased overall antimicrobial activity by 10% to 64%, depending on the strain originand the properties of their bacteriocins. This finding challenges the assumption of purely additive effects in multi-metabolite postbiotic systems Conclusion: These findings highlight the importance of considering inter-strain interactions in the co-cultivation of probiotic strains for the development of novel antimicrobial probiotic biopreparations. The antimicrobial efficacy of multi-strain formulations may be influenced by interactions between exopolysaccharides and bacteriocins synthesized during bacterial growth, which may depend on different structure of postbiotics. Obtained data should be taken into account in the design of probiotic-based strategies for the prevention of some infectious diseases Novelty of the Study: This research provides the first systematic evaluation of the in vitro interactions between purified bacteriocins and exopolysaccharides (EPS) produced specifically by probiotic Enterococcus strains. It identifies a previously underreported antagonistic relationship, demonstrating that the structural interference of high-molecular-weight EPS can reduce the antibacterial efficacy of bacteriocins by 10% to 64%. This finding is critical for the precise design of multi-metabolite postbiotic formulations, challenging the assumption, of purely additive effects in such systems. Keywords: Postbiotics, Enterococcus, bacteriocins, exopolysaccharide, antimicrobial activity, antagonistic interaction, functional food.
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