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Halimi, Shahnaz; Mirsalehian, Akbar
Microbiology and immunology, 02/2016, Volume: 60, Issue: 2Journal Article
ABSTRACT The probiotic potential of Lactobacillus species isolated from infant feces was investigated. For this study, the antibiotic susceptibility, tolerance in gut‐related conditions, antimicrobial activity, and ability to adhere to a human colorectal adenocarcinoma cell line (Caco‐2 cells) of four common Lactobacillus species (Lactobacillus paracasei n = 15, Lactobacillus rhamnosus n = 45, Lactobacillus gasseri n = 20 and Lactobacillus fermentum n = 18) were assessed. Most isolates that which were sensitive to imipenem, ampicillin, gentamycin, erythromycin and tetracycline were selected for other tests. L. gasseri isolates had the greatest sensitivity to gastric and intestinal fluids (<10% viability). L. fermentum (FH5, FH13 and FH18) had the highest adhesion to Caco‐2 cells. The lowest antibacterial activity against pathogenic bacteria was shown by L. gasseri strains in spot tests. Furthermore, non‐adjusted cell‐free culture supernatants with low pH had greater antimicrobial activity, which was related to organic acid. The results showed that some isolates of L. rhamnosus and L. fermentum are suitable for use as a probiotic.
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