Screening and characterization of bacteriocins produced by some Strains of Lactobacillus spp isolated from Iranian Dairy products

Subject Areas : Food Science and Technology

سعید  Mirdamadi ¹ (- Department of Biotechnology, Iranian Research Organization for Science and Technology (IROST), Tehran, Iran)
مهرنوش  Tangestani ² (- Department of Biotechnology, Iranian Research Organization for Science and Technology (IROST), Tehran, Iran)

Received: 2011-07-06 Accepted : 2011-11-28 Published : 2011-11-22

Keywords: Nisin, Lactobacilli, bacteriocin, Preservatives, Food Products,

Abstract :

   In this study, the inhibitory effects of bacteriocins of lactobacilli which were isolated from Iranian traditional dairy products was determined against known gram positive, gram negative and yeast by well diffusion technique. Among 8 isolates with higher capability of bacteriocin production, 2 isolates were selected for further investigations. The bacteriocins were purified by iso-propanol and ammonium sulfate precipitation following by dialysis and chromatography technique. The molecular weight of bacteriocins was determined as 45 to 66/2 KDa. by SDS-page electrophoresis. According to the results, the produced bacteriocins had more inhibition effect on Micrococcus luteus PTCC1169, Staphylococcus epidermidis PTCC1435 as well as Bacillus cereus PTCC1247 and with lesser degree of extent on Listeria monocytogenes PTCC 1301. Results also revealed that, Micrococcus luteus  was the most sensitive bacterium among indicator bacteria, while Candid albicans PTCC 5027 identified as the most resistance organism. This research showed that, bacteriocins produced by lactobacilli isolated from traditional dairy products have high potency to be used against microbial pathogens and could be applied as bio-preservative in food products.

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