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Recovery of Lactobacillus casei strain Shirota (LcS) from faeces of healthy Singapore adults after intake of fermented milk

In: Beneficial Microbes
Authors:
W.W.T. Khine Department of Microbiology & Immunology, Yong Loo Lin School of Medicine, National University of Singapore, 5 Science Drive 2, Singapore 117545, Singapore.
Functional Food Forum, Faculty of Medicine, University of Turku, Turku 20014, Finland.

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X.J. Ang Ngee Ann Polytechnic, 535, Clementi Road, Singapore S599489, Singapore.

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Y.S. Chan Ngee Ann Polytechnic, 535, Clementi Road, Singapore S599489, Singapore.

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W.Q. Lee Ngee Ann Polytechnic, 535, Clementi Road, Singapore S599489, Singapore.

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S.Y. Quek Ngee Ann Polytechnic, 535, Clementi Road, Singapore S599489, Singapore.

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S.H. Tan Ngee Ann Polytechnic, 535, Clementi Road, Singapore S599489, Singapore.

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H.T.A. Teo Department of Microbiology & Immunology, Yong Loo Lin School of Medicine, National University of Singapore, 5 Science Drive 2, Singapore 117545, Singapore.

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J.K.B. Teo Ngee Ann Polytechnic, 535, Clementi Road, Singapore S599489, Singapore.

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Q.C. Lau Ngee Ann Polytechnic, 535, Clementi Road, Singapore S599489, Singapore.

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Y-K. Lee Department of Microbiology & Immunology, Yong Loo Lin School of Medicine, National University of Singapore, 5 Science Drive 2, Singapore 117545, Singapore.
Department of Surgery, National University of Hospital, Tower Block, 1E Kent Ridge Road, Singapore 119228, Singapore.

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To validate survival of Lactobacillus casei strain Shirota (LcS) during passage through the gastrointestinal tract of healthy Singaporean young adults, 21 participants (18-25 years old) were asked to consume a 100 ml of fermented milk drink containing 1.0×108 cfu/ml of LcS daily for 14 days, and to maintain their dietary habit and life style. During and at the end of the ingestion period, both culture method (identity confirmed by ELISA) and 16s rRNA sequencing results revealed that viable LcS (7.27 and 7.64 log10 cfu/g of faeces at the ingestion period Day 7 and Day 14, respectively) and Lactobacillus could be recovered from the faeces of all the subjects. The viable LcS count from male and female were comparable for each time point. Before consumption (baseline) and 14 days after cessation of consumption of the fermented milk, LcS was not detected in most of the subjects. In this study condition, the composition of the major gut microbiota (>0.1% in relative abundance of genus) and characteristics of defaecation such as stool consistency and frequency of defecation did not change throughout the study before and after ingestion of LcS. LcS was able to survive passage through the gastrointestinal tract of Singapore adults without sustainable colonisation, but the effect of LcS on microbiota modulation, stool consistency and frequency was not observed under this study condition.

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