Year: 2013
Type: other
Abstract: The aims of this study were to investigate the digestibility and the stability of six exopolysaccharides (EPS) produced by lactic acid bacteria isolated from raw milk and traditional fermented dairy products, and to evaluate their prebiotic potential. Four homopolysaccharides (HoPS, composed of glucose solely) produced by Lactococcus lactis 1.8, Leuconostoc citreum 1.12, Leuc. citreum 2.8, and Weissella confusa/cibaria 38.2 and two heteropolysaccharides (HePS) produced by Streptococcus thermophilus ST 111 (repeating unit composed of galactose and rhamnose in a 5:2 ratio) and S. thermophilus LY03 (repeating unit with a galactose:glucose ratio of 4:1) were tested. No degradation of the six EPS was seen during in vitro digestions mimicking the passage through the upper gastrointestinal tract. The two Clostridium strains used in the present study as well as Anaerostipes caccae LMG 14662T and Roseburia intestinalis LMG 14610T could not metabolize any of the six EPS tested, while the two Bacteroides strains grew on all EPS and L. casei YIT 9029 grew on all HoPS. The HoPS of L. lactis 1.8 proved to be the most susceptible for degradation, particularly by Bifidobacterium pseudocatenulatum LMG 10505T. The fermentation profile of L. lactis 1.8 EPS by B. pseudocatenulatum LMG 10505T indicated the prebiotic potential of this substrate.
Language: English
Subfield: Food Science
Domain: Life Sciences
Open Access status: green
OpenAlex ID: W3214253879