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http://dx.doi.org/10.5352/JLS.2017.27.2.202

Characterization of Bacteriocin Produced from Isolated Strain of Bacillus sp.  

Ham, Seung-Hee (Department of Bio Health Science, Changwon National University)
Choi, Nack-Shick (Department of Bio Health Science, Changwon National University)
Moon, Ja-Young (Department of Bio Health Science, Changwon National University)
Baek, Sun-Hwa (Department of Bio Health Science, Changwon National University)
Lee, Song-Min (Department of Bio Health Science, Changwon National University)
Kang, Dae-Ook (Department of Bio Health Science, Changwon National University)
Publication Information
Journal of Life Science / v.27, no.2, 2017 , pp. 202-210 More about this Journal
Abstract
As an effort to find a potential biopreservative, we isolated bacterial strains producing bacteriocin from fermented foods. A strain was finally selected and characteristics of the bacteriocin were investigated. The selected strain was identified as Bacillus subtilis E9-1 based on the 16S rRNA gene analysis. The culture supernatant of B. subtilis E9-1 showed antimicrobial activity against Gram-positive bacteria. Subtilisin A, ${\alpha}$-chymotrypsin, trypsin and proteinase K inactivated the antimicrobial activity, which means its proteinaceous nature, a bacteriocin. The bacteriocin activity was fully retained at the pH range from 2.0 to 8.0 and stable at up to $100^{\circ}C$ for 60 min. Solvents such as ethanol, isopropanol and methanol had no effect on the antimicrobial activity at the concentration of 100% but acetone and acetonitrile reduced the activity at up to 100% concentration. Cell growth of four indicator strains was dramatically decreased in dose-dependent manner. Listeria monocytogenes was the most sensitive, but Enterococcus faecium was the most resistant. Bacillus cereus and Staphylococcus aureus showed the medium sensitivity. The bacteriocin showed its antimicrobial activity against B. cereus and L. monocytogenes via bactericidal action. The number of viable cells of L. monocytogenes started to reduce after addition of bacteriocin to the minced beef. The bacteriocin was purified through acetone concentration, gel filtration chromatography and RP-HPLC. The whole purification step led to a 6.82 fold increase in the specific activity and 6% yield of bacteriocin activity. The molecular weight of the purified bacteriocin was determined to be 3.3 kDa by MALDI-TOF/TOF mass spectrometry.
Keywords
Bacillus subtilis; bacteriocin; molecular weight; physicochemical properties; purification;
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