Asian Journal of Microbiology, Biotechnology & Environmental Sciences Paper

Vol 11, Issue 4, 2009; Page No.(797-802 )

CHARACTERIZATION OF HIGHLY STABLE BACTERIOCIN FROM ENTER OCOCCUS FAECILIM ISOLATED FROM TRADITIONAL FERMENTED FINGER MILLET

DASARATHAN RAJESH, KUNTHALA JAYARMAN AND GURUNATHAN JAYARAMAN

Abstract

Samples of fermented millet (koozh) prepared traditionally, were collected from different places in and around Thiruvanamalai and Vellore district (South India) including the tribal inhabited areas of Jawadhu hills. About 75 different organisms were isolated of which seven were found to be lactic acid bacteria (LAB).0u t of these seven strains, a single strain that produce bacteriocin was identified, characterized and confirmed by 16s rDNA sequencing as Enterococcus faecium. The bacteriocin inhibited the growth of Lactobacillus sp and other food borne pathogens like Leuconostoc mesenteroides and Listeria rnonocytogenes and found to exhibit bactericidal activity of 52.66 IU/mL (nisin equivalents). Bacteriocin was treated with proteinase K, pronase, papain, chymotrypsin, trypsin and pepsin, but the action of protease alone was observed, indicates that the bacteriocin was Proteinaceous in nature. This bacteriocin was found to be stable at pH range of 2-12 and tolerant to temperature for 2 hrs upto 110°C at acidic pH. Such molecules of high stability and broad spectral antibacterial property has potential application in food industry as probiotic supplements.

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