In-Vitro Synergestic Effects Between Bifidobacterium Pseudocatenulatum G4 and Inulin on Human Gastrointestinal Tract Microbial Composition
The eagerness in finding the most effective probiotic strain has attracted many investigations. Bifidobacterium pseudocatenulatum G4, strain isolated from free-living infant was reported to have characteristics as probiotic candidate. Meanwhile, inulin is a known natural source of carbon that can...
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| Format: | Thesis |
| Language: | English English |
| Published: |
2009
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/7584/1/ABS_---__FSTM_2009_24.pdf |
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| Summary: | The eagerness in finding the most effective probiotic strain has attracted many
investigations. Bifidobacterium pseudocatenulatum G4, strain isolated from free-living
infant was reported to have characteristics as probiotic candidate. Meanwhile, inulin is a
known natural source of carbon that can act as a prebiotic substance. The consumption of
probiotic, prebiotic, and its combination (synbiotic) was reported to have the ability to
alter microbial composition in human gastrointestinal tract (GIT). In this study, the
effects of B. pseudocatenulatum G4 (probiotic), inulin (prebiotic) and its combination
(synbiotic) towards the human GIT microbial composition were evaluated in vitro. The
effects of inulin incorporated in chocolate products as one of its ingredients were also
tested. Real-time PCR assay with selected genus- and species-specific primers were used
as a tool in identification and enumeration of selected bacterial strain in fermentation of
mixture of bacteria from human faecal sample while dilution and plate count technique
was used to enumerate the bacterial cell in fermentation of pure culture bacteria. The
morphology of the tested Bifidobacterium strains was observed and the species was confirmed by molecular method targeting 16S rRNA gene. In pure culture batch
fermentation of tryptone peptone yeast (TPY) medium supplemented with 0.5% inulin, B.
pseudocatenulatum G4 grew at the growth rate of 0.53 ± 0.06 log10 h-1 as compared to
other Bifidobacterium strains namely B. breve ATCC 15700, B. longum BB536, and B.
infantis ATCC 15697 which grew at 0.45 ± 0.04 log10 h-1, 0.31 ± 0.08 log10 h-1, and 0.72
± 0.03 log10 h-1, respectively. The same amount of inulin was then introduced into darkand
milk chocolate and caused B. pseudocatenulatum G4, B. breve ATCC 15700, B.
longum BB536, and B. infantis ATCC 15697 to grow at 0.54 ± 0.06, 0.44 ± 0.04, 0.36 ±
0.05, 0.73 ± 0.02 log10 h-1 for dark chocolate and 0.57 ± 0.05, 0.46 ± 0.03, 0.41 ± 0.04,
0.75 ± 0.01 log10 h-1 for milk chocolate respectively. Some of the chocolate ingredients
had also influenced the growth of B. pseudocatenulatum G4. The addition of 0.5% of
cocoa liquor in TPY medium caused B. pseudocatenulatum G4 to grow at 0.29 ± 0.03
log10 h-1, and isomalt at 0.59 ± 0.05 log10 h-1 compared to TPY medium without any
additional carbon source which grew at 0.19 ± 0.02 log10 h-1, while the addition of cocoa
butter did not support the growth of B. pseudocatenulatum G4. In 24 hours batch
fermentation of human faecal bacteria, B. pseudocatenulatum G4 (Probiotic) showed its
probiotic effects by inhibiting the growth of Salmonella and Enterococcus faecalis. The
addition of inulin (Prebiotic) selectively supported the growth of Bifidobacterium and
Lactobacillus as well as inhibits the growth of Bacteroides, Salmonella, and E. faecalis.
The synbiotic combination of B. pseudocatenulatum G4 and inulin (Synbiotic) showed a
synergestic effect as they reduced the number of Bacteroides, Salmonella, and E. faecalis
better than Probiotic or Prebiotic alone. Synbiotic chocolate preparations (DCsynbiotic
and MCsynbiotic) showed better synergestic effect with B. pseudocatenulatum G4 compared to Synbiotic when Bifidobacterium increased at 1.64 log10 (DCsynbiotic) and
1.67 log10 cells/ml (MCsynbiotic) from the initial counts. Lactobacillus also increased its
cell number higher than Synbiotic treatment. Nevertheless, synbiotic chocolate
preparations also gave a positive result towards the growth of potential pathogenic
bacteria when compared to Synbiotic. However, the inhibition pattern still can be
observed on Salmonella and E. faecalis when compared to glucose (control). The
antimicrobial action was largely due to the pattern of lactic and acetic acid production in
fermentation. Here, the synbiotic approach was more efficient than prebiotic or probiotic
alone to modulate the human GIT microbial composition and B. pseudocatenulatum G4
with inulin is a compatible synbiotic pair to perform the function. |
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