title: Characterization of Intestinal Lactobacillus reuteri Strains as Potential Probiotics.
abstract: This study was conducted to evaluate the probiotic properties of Lactobacillus reuteri isolated from human infant feces (less than 3 months). Out of thirty-two representative L. reuteri strains isolated from the infant human feces, nine isolates (i.e. LR5, LR6, LR9, LR11, LR19, LR20, LR25, LR26 and LR34) showed survival in acid, bile and simulated stomach-duodenum passage conditions, indicating their high tolerance to gastric juice, duodenal juice and bile environments. The nine isolates did not show strong hydrophobic properties because the percentages of adhesion to the apolar solvent, n-hexadecane, did not exceed 40%, showing that their surfaces were rather hydrophilic. Functionality of these nine probiotic isolates was supported by their antagonistic activity and their ability to deconjugate bile salts. The safety of the nine indigenous L. reuteri isolates was supported by the absence of transferable antibiotic resistance determinants, DNase activity, gelatinase activity and hemolysis. The results obtained so far suggest that the nine strains are resistant to low pH, bile salts and duodenum juice, so they could survive when passing through the upper part of the gastrointestinal tract and fulfill their potential probiotic action in the host organism. According to these results, the L. reuteri strains isolated from human infant feces possess interesting probiotic properties that make them potentially good candidates for probiotics.
authors.affiliation: Dairy Microbiology Division, Microbial Metabolites Laboratory, National Dairy Research Institute, Karnal, 132 001, India.
authors.forename: Tejinder Pal
authors.initials: TP
authors.lastname: Singh
authors.affiliation: Dairy Microbiology Division, Microbial Metabolites Laboratory, National Dairy Research Institute, Karnal, 132 001, India.
authors.forename: Gurpreet
authors.initials: G
authors.lastname: Kaur
authors.affiliation: Dairy Microbiology Division, Microbial Metabolites Laboratory, National Dairy Research Institute, Karnal, 132 001, India. rkm.micro@gmail.com.
authors.forename: Ravinder Kumar
authors.initials: RK
authors.lastname: Malik
authors.affiliation: Institute of Microbiology and Biotechnology, Federal Research Institute for Nutrition and Food, Haid-und Neustr. 9, 76131, Karlsruhe, Germany.
authors.forename: Ulrich
authors.initials: U
authors.lastname: Schillinger
authors.affiliation: Max Rubner-Institute, Federal Research Institute for Nutrition and Food, Haid-und-Neu-Str. 9, 76131, Karlsruhe, Germany.
authors.forename: Claudia
authors.initials: C
authors.lastname: Guigas
authors.affiliation: Animal Biochemistry Division, National Dairy Research Institute, Karnal, 132 001, India.
authors.forename: Suman
authors.initials: S
authors.lastname: Kapila
keywords: Antagonistic activity; Lactobacillus reuteri; Probiotic