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Safari, Mohammad Sadegh, Keyhanfar, Mehrnaz, Shafiei, Rasoul. (1398). Investigating the antibacterial effects of some Lactobacillus, Bifidobacterium and acetobacter strains killed by different methods on Streptococcus mutans and Escherichia coli. , 8(3), 103-111. doi: 10.22099/mbrc.2019.33582.1399
Mohammad Sadegh Safari; Mehrnaz Keyhanfar; Rasoul Shafiei. "Investigating the antibacterial effects of some Lactobacillus, Bifidobacterium and acetobacter strains killed by different methods on Streptococcus mutans and Escherichia coli". , 8, 3, 1398, 103-111. doi: 10.22099/mbrc.2019.33582.1399
Safari, Mohammad Sadegh, Keyhanfar, Mehrnaz, Shafiei, Rasoul. (1398). 'Investigating the antibacterial effects of some Lactobacillus, Bifidobacterium and acetobacter strains killed by different methods on Streptococcus mutans and Escherichia coli', , 8(3), pp. 103-111. doi: 10.22099/mbrc.2019.33582.1399
Safari, Mohammad Sadegh, Keyhanfar, Mehrnaz, Shafiei, Rasoul. Investigating the antibacterial effects of some Lactobacillus, Bifidobacterium and acetobacter strains killed by different methods on Streptococcus mutans and Escherichia coli. , 1398; 8(3): 103-111. doi: 10.22099/mbrc.2019.33582.1399

Investigating the antibacterial effects of some Lactobacillus, Bifidobacterium and acetobacter strains killed by different methods on Streptococcus mutans and Escherichia coli

Molecular Biology Research Communications
مقاله 2، دوره 8، شماره 3، 2019، صفحه 103-111    اصل مقاله (742.53 K)
نوع مقاله: Original article
شناسه دیجیتال (DOI): 10.22099/mbrc.2019.33582.1399
نویسندگان
Mohammad Sadegh Safari1؛ Mehrnaz Keyhanfar* 1؛ Rasoul Shafiei2
1Department of Biotechnology, Faculty of Advanced Sciences and Technologies, University of Isfahan, Isfahan, Iran
2Department of Biology, Faculty of Sciences, University of Isfahan, Isfahan, Iran
چکیده
Although there are many health advantages assigned to different live bacteria such as probiotics, some health threatening effects have also been reported. For example, live bacteria can transfer antibiotic resistance genes to other commensal and opportunistic bacteria of gastrointestinal tract. Recently, it was shown that using killed bacteria have some advantages over live ones. In this research, heat, paraformaldehyde and ozone killing methods were used to kill the bacteria. Acetobacter cerevisiae, Lactobacillus acidophilus, Bifidobacterium lactis and traditional vinegar and fermented dairy product (Kumeh) derived bacteria were killed and their antibacterial activity against Streptococcus mutans and Escherichia coli was investigated. To identify the bacteria isolated from the traditional products, 16S rDNA gene was partially sequenced. The gene analysis showed vinegar and Kumeh derived bacteria were Acetobacter pasteurianus and Lactobacillus crustorum (LcK) strains respectively. The S. mutans growth inhibition was detected in the all concentrations of all killed samples. However, generally, E. coli showed more resistant to the killed bacteria than S. mutans and the antibacterial effect of heat-killed bacteria against E. coli was not observed in the all concentrations for some killed bacteria. Among the pathogenic bacteria, S. mutans was the most sensitive one to the killed bacteria with 70% of reduction in its viability. In conclusion, this research showed that different killed bacteria had different effects on other bacteria and the killing method showed an impact on these effects. Overall, paraformaldehyde-killed L.crustorum (LcK) showed the best antibacterial activity against S. mutans; about 70% decrease in bacterial viability.
کلیدواژه‌ها
Acetobacter؛ Lactobacillus؛ Bifidobacterium؛ killed bacteria
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