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The biodiversity of Lactobacillus spp. from Iranian raw milk Motal cheese and antibacterial evaluation based on bacteriocin-encoding genes.

Abstract：

:Lactobacilli, as the largest group of lactic acid bacteria, produce large amounts of antimicrobial metabolites such as organic acids, fatty acids, ammonia, hydrogen peroxide, diacetyl and bacteriocin, which inhibit the growth of pathogenic bacteria and increase shelf life of food. The aim of this study was to identify the Lactobacillus spp. isolated from Iranian raw milk Motal cheese and to detect the presence of bacteriocin genes in the isolated Lactobacillus strains exhibiting antimicrobial activity. For this purpose, 6 Motal cheese samples from Dasht-e-Moghan region, Iran, were subjected to microbial characterization. Nineteen Lactobacillus spp. were isolated and subsequently identified based on biochemical and molecular methods. According to the sequencing of isolates, Lactobacillus spp. consisted primarily of Lactobacillus brevis, Lactobacillus plantarum, Lactobacillus casei and Lactobacillus buchneri. The identified isolates were then evaluated for antimicrobial activity against Escherichia coli ATCC 25922, Listeria innocua ATCC 33090 and Staphylococcus aureus ATCC 25923. The results of PCR analysis using specific primers of genes encoding Bacteriocin, revealed the presence of Plantaricin A and Plantaricin EF in all Lactobacillus plantarum isolates and Brevicin 174A in 5 of Lactobacillus brevis isolates, whereas the gene encoding Pediocin PA-1 was not observed in any of examined isolates. It is therefore concluded that bacteriocinogenic isolates could be recommended as suitable candidates to be used as starter, adjunct-starter or antimicrobial agents for production of fermented and non-fermented products.

journal_name

AMB Express

journal_title

AMB Express

authors

Azizi F,Habibi Najafi MB,Edalatian Dovom MR

doi

10.1186/s13568-017-0474-2

subject

Has Abstract

pub_date

2017-09-18 00:00:00

pages

176

issue

1

issn

2191-0855

pii

10.1186/s13568-017-0474-2

journal_volume

7

pub_type

杂志文章

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