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Safety Evaluation and Colonisation Abilities of Four Lactic Acid Bacteria as Future Probiotics

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Abstract

The study evaluated the safety and colonisation properties of four lactic acid bacteria (LAB), by determining their cell hydrophobicity and aggregation abilities. In addition, the presence of virulence and resistance genes was assayed in these probiotic candidates. Lactobacillus reuteri ZJ625, Lactobacillus reuteri VB4, Lactobacillus salivarius ZJ614 and Streptococcus salivarius NBRC13956 were tested for cell surface hydrophobicity abilities against xylene, chloroform and ethyl acetate. The isolates were also tested for auto-aggregation and co-aggregation abilities; the optical densities of cell growth were measured after 1, 2, 3 and 4 h of experimental set-up. DNA was extracted from all the four isolates and amplified using PCR with specific primers to detect virulence genes of adhesion collagen protein (ace) and aggregation substances (agg and asa); also, resistance genes of Vancomycin vanA, Vancomycin vanC1 and Vancomycin vanC2/3 were assayed in the four isolates. The isolates showed high hydrophobicity to all solvents: xylene (78–84%), chloroform (68–75%) and ethyl acetate (52–60%). High auto- and co-aggregations ranging from 60 to 70% and from 45 to 56% respectively were observed in the isolates after 4 h of incubation at 37 °C. Some of the tested isolates showed the presence of virulence and resistance genes; however, this does not indicate that these genes are unsafe because their transmission and expression abilities are unknown. Therefore, in this study, the isolates studied are considered safe for use as future probiotics, as revealed from results presented, which generally represents the scanned safety evaluations of the isolates as promising probiotics.

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Funding

This work received support from the Agricultural Research Council – Animal Production, Irene, South Africa; the Red Meat Research & Development South Africa (RMRDSA) and the South Africa Medical Research Council.

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Authors and Affiliations

  1. Agricultural Research Council - Animal Production Institute, Gastrointestinal Microbiology and Biotechnology Division, Irene, 0062, South Africa

    Ziyanda C. Dlamini, Rashwahla L. S. Langa & Olayinka A. Aiyegoro

  2. SAMRC Microbial Water Quality Monitoring Centre, University of Fort Hare, Alice, 5700, South Africa

    Ziyanda C. Dlamini, Olayinka A. Aiyegoro & Anthony I. Okoh

Authors
  1. Ziyanda C. Dlamini
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  2. Rashwahla L. S. Langa
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  3. Olayinka A. Aiyegoro
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Correspondence to Olayinka A. Aiyegoro.

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Dlamini, Z.C., Langa, R.L.S., Aiyegoro, O.A. et al. Safety Evaluation and Colonisation Abilities of Four Lactic Acid Bacteria as Future Probiotics. Probiotics & Antimicro. Prot. 11, 397–402 (2019). https://doi.org/10.1007/s12602-018-9430-y

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  • DOI: https://doi.org/10.1007/s12602-018-9430-y

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