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Interactions between Bifidobacterium and Bacteroides species in co-fermentations are affected by carbon sources, including exopolysaccharides produced by bifidobacteria

AuthorsRios-Covián, David ; Arboleya, Silvia ; Hernández-Barranco, Ana María ; Álvarez Buylla, J. R. ; Ruas-Madiedo, Patricia ; Gueimonde Fernández, Miguel ; González de los Reyes-Gavilán, Clara
Issue DateSep-2013
PublisherCSIC - Instituto de Agroquímica y Tecnología de Alimentos (IATA)
European Science Foundation
CitationENGIHR Conference: 154-156 (2013)
AbstractThe colon is a complex microbial ecosystem dominated by obligate anaerobes that reach levels up to 1011 cells per gram of intestinal content. Bacteroides and Bifidobacterium coexist in this ecosystem and they account for up to 20% and 3% of the adult human microbiota respectively. Prebiotics are defined as nondigestible food ingredients that beneficially affect the host by selectively stimulating the growth and/or activity of one or a limited number of bacterial species in the colon, thus improving host health. Bifidobacteria have traditionally been considered as the target of prebiotic action as these substrates can be directly metabolized by these microorganisms; however, some in vitro and in vivo evidences indicate that the effects of prebiotics also involve other members of the human colon microbiota through the utilization of these substrates in combination with bifidobacteria. The most well studied prebiotics to date are inulin-type fructans (1, 2). Exopolisaccharides (EPS) are complex exocellular polymers, composed of several units of monosaccharides, produced by some bacteria. Although the synthesis of EPS in vivo has not been demonstrated yet and the amount of polymer released by the producing bacteria would be presumably low, our previous work indicates that bile stimulates the production of EPS by bifidobacteria under simulated gastrointestinal conditions (3, 4). In addition, EPS could act as fermentable substrates for the human colonic microbiota (5, 6). The fermentation in fecal batch cultures of low amounts of EPS and inulin (0.3% w/v) caused shifts in the synthesis of short chain fatty acids (SCFA), which were related to variations in the levels of some intestinal microbial populations such as Bacteroides and Bifidobacterium (6). The aim of this work was to study the influence that the presence of EPS and other carbon sources (inulin and glucose) exert on the interactions between Bacteroides and Bifidobacterium.
DescriptionTrabajo presentado en la ENGIHR Conference 2013 (The Intestinal Microbiota and Gut Health: Contribution of the Diet, Bacterial Metabolites, Host Interactions and Impact on Health and Disease), celebrada en Valencia del 18 al 20 de septiembre de 2013.
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