POTENTIAL EFFECTS OF DUKU (LANSIUM DOMESTICUM CORR) AND LANGSAT (LANSIUM DOMESTICUM JACK) EXTRACTS ON THE GROWTH OF BIFIDOBACTERIA SPP.
Keywords:Duku (Lansium Domesticum Corr), Langsat (Lansium Domesticum Jack), Bifidobacteria Spp
Objective: Lansium domesticum Corr. is a fruit tree species belongs to the family Meliaceae. There are numerous forms of the species and grouped into two main types: Duku and Langsat. The objective of this study is to screen the ability of adding extracts of freeze-dried duku and langsat to stimulate the growth and stability of selected Bifidobacteria spp in skimmed milk.
Methods: Samples were prepared by adding either 5% or 12% of oligosaccharides from duku, langsat, inulin, galacto-oligosaccharides (GOS) and fructo-oligosaccharides (FOS) to 5% and 12% (w/v) reconstituted nonfat dry milk (NDM), respectively. The specific growth rates (Âµ) for each sample were calculated. All experiments were replicated ten times.
Results: The mean doubling time (Td) for Bifidobacterium longum, was lowest in the presence of freeze-dried duku and langsat compared to GOS, FOS and inulin. Retention of the viability of five Bifidobacterium species was greatest in the presence of freeze-dried duku and langsat followed by GOS, FOS and inulin. The highest percentage of acetic and lactic acids were produced by B. longum, B. infantis and B. adolescentis with freeze-dried duku and langsat. The pattern of results was similar to the commercial product, oligosaccharides (inulin, GOS and FOS).Conclusion: Therefore, this study provides promising results on promoting growth and probiotic activity of natural oligosaccharides compound from freeze-dried duku and langsat.
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