Abstract

ESTRADA MALDONADO, Ana Cristina; GUTIERREZ RAMIREZ, Luz Adriana  and  MONTOYA CAMPUZANO, Olga Inés. In vitro EVALUATION OF THE BACTERICIDAL EFFECT OF NATIVE STOCKS OF Lactobacillus sp. AGAINST Salmonela sp. AND Echerichia coli. Rev. Fac. Nac. Agron. Medellín [online]. 2005, vol.58, n.1, pp.2601-2609. ISSN 0304-2847.

In this investigation, two native stocks of Lactobacillus plantarum and Lactobacillus brevis isolated from fermented products were studied; these grow in culture media and produce a complex extract of organic acids and peptides with bactericidal activity.  The extracts of these stocks showed bactericidal capacity with Salmonella sp. and Escherichia coli.  The tests to determine their action were made with crude and centrifuged extract originating of each one of the stocks, with different storage times, temperatures and pHs. A superior antibacterial activity and stability of the activity was observed in the crude extract stored in temperatures of 0°C and 4°C. With pH 5,5 the best activity of the two extracts against the study stocks was obtained.  It is concluded that the extracts synthesized by both stocks have a high bactericidal potential against these two pathogens that are responsible for nutritional toxi-infections.

Keywords : Antagonistic activity; lactic acid bacteria; indicator organisms; fermented foods; native stocks; bactericidal activity.

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