Abstract
Dahi, an artisanal fermented milk product, widely consumed in Pakistan, is microbiologically diverse, and many bacterial communities await investigation. The current study is first to present probiotic assessment of Bacillus species strains isolated from dahi. Based on 49 identified strains assessed, only 6 strains, i.e., Bacillus licheniformis QAUBL19, QAUBL1901, and QAUBL1902; Bacillus mycoides QAUBM19 and QAUBM1901; and Bacillus subtilis QAUBSS1 were having prominent persistence in the simulated gastrointestinal fluids, being non-hemolytic, with no DNase activity. Probiotic characteristics, cholesterol-assimilating, and carbohydrate-fermenting capabilities were assessed for all the strains. These six strains each showed variant cholesterol assimilating abilities. B. licheniformis QAUBL19 retaining most desired probiotic traits presented both notable cholesterol assimilating and bile salt hydrolase activities. It can be used as a probiotic of choice with hypocholesterolemia ability. B. subtilis QAUBSS1 showed wide carbohydrate fermentation ability and strongest antibacterial potential. It is likely to be considered a probiotic for living beings and starter culture for fermentation of food/feed.
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MI conceptualized and designed the study. MNK and SB prepared the materials, performed the experiments, and collected the data. MNK analyzed the data and drafted the manuscript that was then improved by other authors. All authors read and approved the final manuscript.
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Khan, M.N., Bashir, S. & Imran, M. Probiotic characterization of Bacillus species strains isolated from an artisanal fermented milk product Dahi. Folia Microbiol 68, 757–769 (2023). https://doi.org/10.1007/s12223-023-01048-w
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DOI: https://doi.org/10.1007/s12223-023-01048-w