ORIGINAL PAPER
Bifidobacterium strains inhabiting the
gastrointestinal tract of rat as potential probiotics
for animals
1 |
Institute of Animal Reproduction and Food Research, Department of Food Microbiology
Polish Academy of Sciences,
Tuwima 10, 10-747 Olsztyn, Pola |
J. Anim. Feed Sci. 2008;17(3):398–410
Publication date: 2008-06-24
KEYWORDS
ABSTRACT
The aim of the study was to evaluate in vitro the potential probiotic functionality in the gut of
animal-originated bifidobacteria strains. Eleven B. animalis and five B. pseudolongum strains isolated
from Wistar rats were characterized for their tolerance to low pH and bile, and seven B. animalis
and four B. pseudolongum strains for their ability to adhere to HT-29 cells and mucus. The strains
showed high resistance to three-hour exposure to pH 3 (34-100% of the population survived) and
six-hour exposure to the presence of 3% bile (28-93%), as well as differentiated adhesive abilities.
The number of bacterial cells attached to 100 HT-29 cells ranged from 9 to 33 and from 17 to 645 for
B. pseudolongum and B. animalis strains, respectively, whereas corresponding levels of adherence per
square centimetre of polystyrene-immobilized mucin ranged from 3 × 105 to 4 × 105 and from 5 × 105
to 889 × 105 bacterial cells. Three B. animalis strains (KSP4, PS46 and PS11) resistant to low pH and
bile, well-adhering to epithelial cells and mucus were selected as potential probiotics for animals and
will be evaluated in future in vivo studies.
CORRESPONDING AUTHOR
E. Wasilewska
Institute of Animal Reproduction and Food Research, Department of Food Microbiology
Polish Academy of Sciences,
Tuwima 10, 10-747 Olsztyn, Pola
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