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The effect of resistant starch (RS) on the bovine rumen microflora and isolation of RS-degrading bacteria
Resistant starch (RS) in the diet reaches the large intestine without degradation, where it is decomposed by the commensal microbiota. The fermentation of RS produces secondary metabolites including short-chain fatty acids (SCFAs), which have been linked to a variety of physiological and health effe...
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Published in: | Applied microbiology and biotechnology 2018-06, Vol.102 (11), p.4927-4936 |
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Main Authors: | , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Resistant starch (RS) in the diet reaches the large intestine without degradation, where it is decomposed by the commensal microbiota. The fermentation of RS produces secondary metabolites including short-chain fatty acids (SCFAs), which have been linked to a variety of physiological and health effects. Therefore, the availability of RS as a prebiotic is a current issue. The objectives of this study were (1) to use metagenomics to observe microbial flora changes in
Bos taurus coreanae
rumen fluid in the presence of RS and (2) to isolate RS-degrading microorganisms. The major microbial genus in a general rumen fluid was
Succiniclasticum
sp., whereas
Streptococcus
sp. immediately predominated after the addition of RS into the culture medium and was then drastically replaced by
Lactobacillus
sp. The presence of
Bifidobacterium
sp. was also observed continuously. Several microorganisms with high RS granule-degrading activity were identified and isolated, including
B. choerinum
FMB-1 and
B. pseudolongum
FMB-2.
B. choerinum
FMB-1 showed the highest RS-hydrolyzing activity and degraded almost 60% of all substrates tested. Coculture experiments demonstrated that
Lactobacillus brevis
ATCC 14869, which was isolated from human feces, could grow using reducing sugars generated from RS by
B. choerinum
FMB-1. These results suggest that
Bifidobacterium
spp., especially
B. choerinum
FMB-1, are the putative primary degrader of RS in rumen microbial flora and could be further studied as probiotic candidates. |
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ISSN: | 0175-7598 1432-0614 |
DOI: | 10.1007/s00253-018-8971-z |